1 | /* Tracy-2 |
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2 | |
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3 | J. Bengtsson, CBP, LBL 1990 - 1994 Pascal version |
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4 | SLS, PSI 1995 - 1997 |
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5 | M. Boege SLS, PSI 1998 C translation |
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6 | L. Nadolski SOLEIL 2002 Link to NAFF, Radia field maps |
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7 | J. Bengtsson NSLS-II, BNL 2004 - |
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8 | |
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9 | t2ring.c -- Routines for closed beam lines |
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10 | |
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11 | */ |
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12 | |
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13 | |
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14 | #define n 4 |
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15 | |
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16 | |
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17 | void GetNu(Vector2 &nu, Matrix &M) |
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18 | { |
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19 | int i; |
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20 | double sgn, detp, detm, b, c, th, tv, b2mc, x_arg, y_arg; |
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21 | Matrix M1; |
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22 | |
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23 | globval.stable = true; |
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24 | |
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25 | CopyMat((long)n, M, M1); |
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26 | |
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27 | for (i = 0; i < n; i++) |
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28 | M1[i][i] -= 1.0; |
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29 | detp = DetMat((long)n, M1); /* det(M-I) */ |
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30 | |
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31 | for (i = 0; i < n; i++) |
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32 | M1[i][i] += 2.0; |
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33 | detm = DetMat((long)n, M1); /* det(M+I) */ |
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34 | |
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35 | for (i = 0; i < n; i++) |
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36 | M1[i][i] -= 1.0; /* restore M */ |
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37 | |
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38 | b = (detp-detm)/16.0; c = (detp+detm)/8.0 - 1.0; |
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39 | th = (M1[0][0]+M1[1][1])/2.0; tv = (M1[2][2]+M1[3][3])/2.0; |
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40 | |
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41 | b2mc = b*b - c; |
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42 | |
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43 | if (b2mc < 0.0) { |
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44 | globval.stable = false; nu[0] = -1.0; nu[1] = -1.0; |
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45 | printf("GetNu: unstable\n"); |
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46 | return; |
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47 | } |
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48 | |
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49 | sgn = (th > tv)? 1.0 : -1.0; |
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50 | |
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51 | x_arg = -b + sgn*sqrt(b2mc); |
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52 | if (fabs(x_arg) <= 1.0) { |
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53 | nu[X_] = acos(x_arg)/(2.0*M_PI); |
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54 | if (M1[0][1] < 0.0) nu[X_] = 1.0 - nu[X_]; |
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55 | } else { |
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56 | globval.stable = false; nu[X_] = -1.0; |
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57 | printf("GetNu: unstable (horizontal)\n"); |
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58 | } |
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59 | |
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60 | y_arg = -b - sgn*sqrt(b2mc); |
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61 | if (fabs(y_arg) <= 1.0) { |
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62 | nu[Y_] = acos(y_arg)/(2.0*M_PI); |
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63 | if (M1[2][3] < 0.0) nu[Y_] = 1.0 - nu[Y_]; |
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64 | } else { |
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65 | globval.stable = false; nu[Y_] = -1.0; |
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66 | printf("GetNu: unstable (vertical)\n"); |
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67 | return; |
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68 | } |
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69 | |
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70 | return; |
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71 | } |
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72 | #undef n |
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73 | |
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74 | |
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75 | /* implementation */ |
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76 | |
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77 | /****************************************************************************/ |
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78 | /* void Cell_GetABGN(Matrix &M_, Vector2 &alpha, Vector2 &beta, Vector2 &gamma, Vector2 &nu) |
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79 | |
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80 | Purpose: called by Ring_Twiss_M and Ring_Twiss |
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81 | |
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82 | Get Twiss parameters from the transfer matrix M |
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83 | |
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84 | [Nx ] |
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85 | M = [ ] |
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86 | [ Ny] |
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87 | |
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88 | where, in the case of mid-plane symmetry |
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89 | |
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90 | [ cos(mu) + alpha sin(mu) beta sin(mu) ] |
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91 | N = [ ] |
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92 | [ -gamma sin(mu) cos(mu) - alpha sin(mu) ] |
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93 | |
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94 | cos(mu) = Trace(N)/2 |
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95 | Alpha = (N11-N22)/(2*sin(mu)) |
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96 | beta = N12/sin(mu) |
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97 | gamma = -N21/sin(mu) |
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98 | |
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99 | Input: |
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100 | M oneturn matrix |
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101 | |
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102 | Output: |
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103 | alpha, beta, gamma vectors of the Twiss parameters |
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104 | nu tune vector |
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105 | |
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106 | Return: |
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107 | global.stable |
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108 | global value to check the linear matrix is stable or not, |
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109 | true stable, |
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110 | false unstable |
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111 | |
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112 | Global variables: |
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113 | none |
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114 | |
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115 | Specific functions: |
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116 | getnu |
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117 | |
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118 | Comments: |
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119 | none |
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120 | |
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121 | ****************************************************************************/ |
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122 | void Cell_GetABGN(Matrix &M, |
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123 | Vector2 &alpha, Vector2 &beta, Vector2 &gamma, Vector2 &nu) |
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124 | { |
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125 | int i = 0, j = 0; |
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126 | double c = 0.0, s = 0.0; |
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127 | |
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128 | globval.stable = true; |
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129 | for (i = 0; i <= 1; i++) { |
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130 | j = (i+1)*2 - 1; |
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131 | /* c=cos(mu) = Tr(N)/2 */ |
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132 | c = (M[j-1][j-1]+M[j][j])/2.0; |
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133 | globval.stable = (fabs(c) < 1.0); |
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134 | if (globval.stable) { |
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135 | // s = sin(mu) |
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136 | s = sqrt(1.0-c*c)*sgn(M[j-1][j]); |
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137 | alpha[i] = (M[j-1][j-1]-M[j][j])/(2.0*s); beta[i] = M[j-1][j]/s; |
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138 | gamma[i] = -(M[j][j-1]/s); |
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139 | // nu[i] = acos(c)/2/pi; |
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140 | GetNu(nu, M); |
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141 | } |
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142 | } |
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143 | } |
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144 | |
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145 | |
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146 | #define n 4 |
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147 | void Cell_Geteta(long i0, long i1, bool ring, double dP) |
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148 | { |
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149 | long int i = 0, lastpos = 0; |
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150 | int j = 0, k = 0; |
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151 | Vector xref; |
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152 | Vector codbuf[Cell_nLocMax+1]; |
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153 | CellType *cellp; |
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154 | |
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155 | /* cod for the energy dP - globval.dPcommon / 2e0 */ |
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156 | if (ring) |
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157 | GetCOD(globval.CODimax, globval.CODeps, dP-globval.dPcommon/2e0, lastpos); |
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158 | else { /* beam mode */ |
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159 | CopyVec(n+2, globval.CODvect, xref); xref[4] = dP - globval.dPcommon/2e0; |
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160 | Cell_Pass(i0, i1, xref, lastpos); |
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161 | } |
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162 | |
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163 | /* Store chromatic orbit for elements i0 to i1 in codbuf */ |
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164 | for (i = i0; i <= i1; i++) |
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165 | CopyVec(n+2, Cell[i].BeamPos, codbuf[i]); |
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166 | |
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167 | /* cod for the energy dP - globval.dPcommon / 2e0 */ |
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168 | if (ring) |
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169 | GetCOD(globval.CODimax, globval.CODeps, dP+globval.dPcommon/2e0, lastpos); |
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170 | else { /* beam mode */ |
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171 | CopyVec(n+2, globval.CODvect, xref); xref[4] = dP + globval.dPcommon/2e0; |
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172 | Cell_Pass(i0, i1, xref, lastpos); |
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173 | } |
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174 | |
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175 | /* cod(dP-globval.dPcommon/2e0) - cod(dP-globval.dPcommon/2e0) */ |
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176 | /* eta = ----------------------------------------------------------- */ |
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177 | /* globval.dPcommon */ |
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178 | /* cod'(dP-globval.dPcommon/2e0) - cod'(dP-globval.dPcommon/2e0) */ |
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179 | /* eta'= --------------------------------------------------------------- */ |
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180 | /* globval.dPcommon */ |
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181 | |
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182 | for (i = i0; i <= i1; i++) { |
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183 | cellp = &Cell[i]; |
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184 | for (j = 1; j <= 2; j++) { |
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185 | k = j*2 - 1; |
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186 | cellp->Eta[j-1] = (cellp->BeamPos[k-1]-codbuf[i][k-1])/globval.dPcommon; |
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187 | cellp->Etap[j-1] = (cellp->BeamPos[k]-codbuf[i][k])/globval.dPcommon; |
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188 | } |
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189 | } |
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190 | } |
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191 | |
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192 | #undef n |
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193 | |
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194 | /****************************************************************************/ |
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195 | /* void getprm(Matrix &Ascr, Vector2 &alpha, Vector2 &beta) |
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196 | |
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197 | Purpose: |
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198 | Assign the Twiss parameters alpha and beta from the matrix Ascr |
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199 | to alpha & beta. |
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200 | |
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201 | M oneturn matrix (A and M are symplectic) |
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202 | |
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203 | ( A11 A12) -1 ( cos(mu) sin(mu)) |
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204 | A = ( ) M = (A R A) with R = ( ) |
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205 | ( A21 A22) 2 2 (-sin(mu) cos(mu)) |
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206 | -1 x + px |
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207 | eps = 2*J o a J = ------ |
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208 | 2 |
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209 | 2 2 2 2 2 2 |
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210 | eps = (A22 + A21 ) x + 2(-A22*A12-A21*A11) x*px + (A11 + A12 ) px |
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211 | gamma alpha beta |
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212 | |
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213 | Input: |
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214 | A matrix |
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215 | |
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216 | Output: |
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217 | alpha vector |
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218 | beta vector |
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219 | |
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220 | Return: |
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221 | alpha, beta. |
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222 | |
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223 | Global variables: |
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224 | none |
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225 | |
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226 | Specific functions: |
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227 | none |
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228 | |
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229 | Comments: |
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230 | none |
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231 | |
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232 | ****************************************************************************/ |
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233 | #define n 4 |
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234 | void getprm(Matrix &Ascr, Vector2 &alpha, Vector2 &beta) |
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235 | { |
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236 | int i=0, j=0; |
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237 | |
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238 | for (i = 1; i <= 2; i++) { |
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239 | j = i*2 - 1; |
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240 | alpha[i-1] = -(Ascr[j-1][j-1]*Ascr[j][j-1] + Ascr[j-1][j]*Ascr[j][j]); |
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241 | beta[i-1] = sqr(Ascr[j-1][j-1]) + sqr(Ascr[j-1][j]); |
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242 | } |
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243 | } |
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244 | |
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245 | /****************************************************************************/ |
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246 | /* void Cell_Twiss_M(long i0, long i1, Matrix &Ascr, bool chroma, |
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247 | bool ring, double dP) |
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248 | |
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249 | Purpose: called by Ring_Twiss_M |
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250 | Calculate Twiss parameters from element i0 to element i1 |
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251 | Method: extended matrix formalism |
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252 | |
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253 | Input: |
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254 | i0 first element |
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255 | i1 last element |
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256 | ring true if a ring, false is a transfer line |
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257 | chroma true if compute chromaticities |
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258 | dP energy offset |
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259 | |
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260 | Output: |
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261 | none |
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262 | |
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263 | Return: |
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264 | none |
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265 | |
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266 | Global variables: |
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267 | none |
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268 | |
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269 | Specific functions: |
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270 | getprm, |
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271 | CopyMat, CopyVec |
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272 | Elem_Pass_M, GetAngle |
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273 | |
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274 | Comments: |
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275 | 17/07/03 use of M_PI instead of pi |
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276 | |
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277 | ****************************************************************************/ |
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278 | void Cell_Twiss_M(long i0, long i1, Matrix &Ascr, bool chroma, |
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279 | bool ring, double dP) |
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280 | { |
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281 | long int i=0L; |
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282 | int j=0, k=0; |
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283 | Vector2 nu1, dnu; |
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284 | Vector xref; /*6*1 vector*/ |
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285 | Matrix Ascr0, Ascr1; /*6*6 matrix*/ |
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286 | CellType *cellp; |
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287 | |
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288 | if (dP != globval.dPparticle) Cell_SetdP(dP); |
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289 | |
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290 | /* Initize the phase */ |
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291 | for (j = 0; j <= 1; j++) |
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292 | nu1[j] = 0.0; /*phase advance*/ |
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293 | |
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294 | /* get alpha & beta for i0 */ |
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295 | cellp = &Cell[i0]; |
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296 | getprm(Ascr, cellp->Alpha, cellp->Beta); /*initialize the alpha & beta functions */ |
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297 | memcpy(cellp->Nu, nu1, sizeof(Vector2)); /*initialize the phase advance*/ |
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298 | CopyMat(n+1, Ascr, Ascr0); CopyVec(n+2L, globval.CODvect, xref); |
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299 | |
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300 | for (i = i0+1; i <= i1; i++){ |
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301 | CopyMat(n+1, Ascr0, Ascr1); |
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302 | /* Ascr1=Elem_M*Ascr0 */ |
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303 | /* xref =Elem(xref) */ |
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304 | Elem_Pass_M(i, xref, Ascr1); /* transport orbit & optic matrix */ |
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305 | |
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306 | cellp = &Cell[i]; |
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307 | /* get alpha and beta for element i */ |
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308 | getprm(Ascr1, cellp->Alpha, cellp->Beta); |
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309 | /*save the orbit at the end of the lattice elment*/ |
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310 | CopyVec(ss_dim, xref,cellp->CODvect); |
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311 | |
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312 | for (j = 0; j <= 1; j++) { |
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313 | k = (j+1) * 2 - 1; |
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314 | /* get phase advances */ |
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315 | dnu[j] = (GetAngle(Ascr1[k-1][k-1], Ascr1[k-1][k]) - |
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316 | GetAngle(Ascr0[k-1][k-1], Ascr0[k-1][k]))/(2.0*M_PI); |
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317 | if ((cellp->Elem.PL >= 0.0) && (dnu[j] < -1e-16)) |
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318 | dnu[j] += 1.0; |
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319 | else if ((cellp->Elem.PL < 0.0) && (dnu[j] > 1e-16)) |
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320 | dnu[j] -= 1.0; |
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321 | nu1[j] += dnu[j]; cellp->Nu[j] = nu1[j]; |
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322 | /* Only correct for bare lattice */ |
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323 | cellp->Eta[j] = Ascr1[k-1][4]; cellp->Etap[j] = Ascr1[k][4]; |
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324 | } |
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325 | CopyMat(n+1, Ascr1, Ascr0); |
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326 | } |
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327 | if (chroma) Cell_Geteta(i0, i1, ring, dP); |
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328 | } |
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329 | #undef n |
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330 | |
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331 | /****************************************************************************/ |
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332 | /* void dagetprm(ss_vect<tps> &Ascr, Vector2 &alpha, Vector2 &beta) |
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333 | |
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334 | Purpose: called by Cell_Twiss |
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335 | Compute Twiss parameters alpha and beta from the matrix Ascr |
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336 | |
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337 | M oneturn matrix (A and M are symplectic) |
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338 | |
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339 | ( A11 A12 ) -1 ( cos(mu) sin(mu) ) |
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340 | A = ( ) M = (A R A) with R = ( ) |
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341 | ( A21 A22 ) ( -sin(mu) cos(mu) ) |
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342 | |
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343 | 2 2 |
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344 | -1 x + px |
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345 | eps = 2*J o a J = ------ |
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346 | 2 |
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347 | 2 2 2 2 2 2 |
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348 | eps = (A22 + A21 ) x + 2(-A22*A12-A21*A11) x*px + (A11 + A12 ) px |
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349 | gamma alpha beta |
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350 | |
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351 | A = Asrc |
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352 | |
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353 | alpha(i-1) = -(A(2i-1,2i-1)*A(2i,2i-1) + A(2i-1,2i)*A(2i,2i)) |
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354 | beta(i-1) = A(2i-1,2i-1)*A(2i-1,2i-1) + A(2i-1,2i)*A(2i-1,2i) |
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355 | |
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356 | Input: |
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357 | Ascr |
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358 | |
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359 | Output: |
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360 | alpha alpha function vector |
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361 | beta beta function vector |
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362 | |
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363 | Return: |
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364 | none |
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365 | |
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366 | Global variables: |
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367 | none |
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368 | |
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369 | Specific functions: |
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370 | getmat |
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371 | |
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372 | Comments: |
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373 | none |
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374 | |
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375 | ****************************************************************************/ |
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376 | #define n 4 |
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377 | void dagetprm(ss_vect<tps> &Ascr, Vector2 &alpha, Vector2 &beta) |
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378 | { |
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379 | int i = 0, j = 0; |
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380 | |
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381 | for (i = 1; i <= 2; i++) { |
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382 | j = i*2 - 1; |
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383 | alpha[i-1] = -(getmat(Ascr, j, j)*getmat(Ascr, j+1, j) |
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384 | + getmat(Ascr, j, j+1)*getmat(Ascr, j+1, j+1)); |
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385 | beta[i-1] = sqr(getmat(Ascr, j, j)) + sqr(getmat(Ascr, j, j+1)); |
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386 | } |
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387 | } |
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388 | |
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389 | /****************************************************************** |
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390 | void Cell_Twiss(long i0, long i1, ss_vect<tps> &Ascr, bool chroma, bool ring, |
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391 | double dP) |
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392 | |
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393 | |
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394 | Purpose: |
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395 | Get the phase, chromaticites, dispersion functions. |
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396 | |
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397 | input: |
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398 | i0: start index of the lattice element |
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399 | i1: end index of the lattice element |
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400 | Ascr: normalized one turn transfer matrix |
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401 | chroma: bool flag to calculate chromaticites |
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402 | ring: for ring lattice or not |
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403 | dP: off momentum |
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404 | ********************************************************************/ |
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405 | void Cell_Twiss(long i0, long i1, ss_vect<tps> &Ascr, bool chroma, bool ring, |
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406 | double dP) |
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407 | { |
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408 | long int i = 0; |
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409 | int j = 0, k = 0; |
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410 | Vector2 nu1, dnu; /* absolute and relative phase advance */ |
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411 | ss_vect<tps> Ascr0, Ascr1; |
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412 | CellType *cellp; |
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413 | |
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414 | /* initialization */ |
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415 | for (j = 0; j <= 1; j++) |
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416 | { |
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417 | nu1[j] = 0.0; |
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418 | dnu[j] = 0.0; |
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419 | } |
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420 | |
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421 | if (globval.radiation) globval.dE = 0.0; |
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422 | |
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423 | cellp = &Cell[i0]; |
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424 | dagetprm(Ascr, cellp->Alpha, cellp->Beta); |
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425 | memcpy(cellp->Nu, nu1, sizeof(Vector2)); |
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426 | |
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427 | Ascr0 = Ascr; |
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428 | for (j = 0; j <= n+1; j++) |
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429 | Ascr0[j] += tps(globval.CODvect[j]); |
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430 | |
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431 | Ascr1 = Ascr0; |
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432 | for (i = i0; i <= i1; i++) |
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433 | { |
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434 | Elem_Pass(i, Ascr1); |
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435 | cellp = &Cell[i]; |
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436 | dagetprm(Ascr1, cellp->Alpha, cellp->Beta); |
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437 | for (j = 0; j <= 1; j++) { |
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438 | k = (j+1)*2 - 1; |
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439 | dnu[j] = (GetAngle(getmat(Ascr1, k, k), getmat(Ascr1, k, k+1)) - |
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440 | GetAngle(getmat(Ascr0, k, k), getmat(Ascr0, k, k+1)))/(2.0*M_PI); |
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441 | |
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442 | if ((cellp->Elem.PL >= 0.0) && (dnu[j] < -1e-16)) |
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443 | dnu[j] += 1.0; |
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444 | else if ((cellp->Elem.PL < 0.0) && (dnu[j] > 1e-16)) |
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445 | dnu[j] -= 1.0; |
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446 | |
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447 | nu1[j] += dnu[j]; |
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448 | |
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449 | cellp->Nu[j] = nu1[j]; |
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450 | cellp->Eta[j] = getmat(Ascr1, k, 5)*getmat(Ascr1, 6, 6) - |
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451 | getmat(Ascr1, k, 6)*getmat(Ascr1, 6, 5); |
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452 | cellp->Etap[j] = getmat(Ascr1, k+1, 5)*getmat(Ascr1, 6, 6) - |
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453 | getmat(Ascr1, k+1, 6)*getmat(Ascr1, 6, 5); |
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454 | } |
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455 | Ascr0 = Ascr1; |
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456 | } |
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457 | |
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458 | if (chroma && !globval.Cavity_on) Cell_Geteta(i0, i1, ring, dP); |
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459 | } |
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460 | |
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461 | #undef n |
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462 | |
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463 | |
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464 | /****************************************************************************/ |
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465 | /* void Ring_Getchrom(double dP) |
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466 | |
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467 | Purpose: called by Ring_Twiss_M and Ring_Twiss |
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468 | Compute chromaticites of the ring by numerical differentiation |
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469 | and by evaluating each time the closed orbit |
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470 | |
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471 | nu(dP+dPlocal)-nu(dP-dPlocal) |
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472 | xi =----------------------------- |
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473 | 2 dPlocal |
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474 | |
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475 | Input: |
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476 | dP particle energy offset (should be zero cf comments) |
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477 | |
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478 | Output: |
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479 | none |
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480 | |
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481 | Return: |
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482 | none |
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483 | |
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484 | Global variables: |
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485 | status |
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486 | globval |
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487 | |
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488 | Specific functions: |
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489 | Cell_GetABGN, Cell_GetCOD |
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490 | |
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491 | Comments: |
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492 | 03/01/03 Stability test from GETcod routines slightly modified |
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493 | WARNING : this routine does not give the chromaticities for dP != 0 |
---|
494 | but the local slope of the curve xi=f(dP) |
---|
495 | 16/10/03 Modified convergence test: now done for both planes |
---|
496 | 01/09/10 Modify the convergence criteria on relative diff of the chroma value |
---|
497 | The previous test does not work well for non zero chromaticities |
---|
498 | Test convergence changed if chroma closed to zero |
---|
499 | 28/06/11 Fix the bug for the lattice with negative momentum compact factor, |
---|
500 | by changing expo += 1 to expo += log(5)/LOG10. |
---|
501 | By Jianfeng Zhang @ SOLEIL |
---|
502 | |
---|
503 | ****************************************************************************/ |
---|
504 | #define n 4 |
---|
505 | #define chromeps 1e-6 /* convergence condition for chromaticity computation */ |
---|
506 | #define LOG10 log(10.0) |
---|
507 | #define ZEROCHRO 0.1 |
---|
508 | |
---|
509 | void Ring_Getchrom(double dP) { |
---|
510 | long int lastpos = 0; |
---|
511 | double NORMchro = 1.0; |
---|
512 | double dPlocal = 0.0, expo = 0.0, Norm_TEMP = 0.0; |
---|
513 | int j; |
---|
514 | Vector2 alpha = { 0.0, 0.0 }, beta = { 0.0, 0.0 }, gamma = { 0.0, 0.0 }; |
---|
515 | Vector2 nu = { 0.0, 0.0 }, nu0 = { 0.0, 0.0 }, TEMP={0.0,0.0}, Chrom={0.0,0.0};; |
---|
516 | |
---|
517 | if (dP != 0.0) |
---|
518 | fprintf(stdout, |
---|
519 | "Ring_Getchrom: Warning this is NOT the CHROMA, dP=%e\n", dP); |
---|
520 | |
---|
521 | /* initialization */ |
---|
522 | globval.Chrom[0] = 1e38; |
---|
523 | globval.Chrom[1] = 1e38; |
---|
524 | |
---|
525 | expo = log(globval.dPcommon) / LOG10; |
---|
526 | do { |
---|
527 | for (j = 0; j <= 1; j++) |
---|
528 | Chrom[j] = globval.Chrom[j]; |
---|
529 | |
---|
530 | dPlocal = exp(expo * LOG10); |
---|
531 | //Get cod for energy dP - globval.dPcommon |
---|
532 | GetCOD(globval.CODimax, globval.CODeps, dP - dPlocal * 0.5, lastpos); |
---|
533 | |
---|
534 | if (!status.codflag) { |
---|
535 | // if no cod |
---|
536 | fprintf(stdout, "Ring_Getchrom: Lattice is unstable for" |
---|
537 | " dP-globval.dPcommon=% .5e\n", dP - dPlocal * 0.5); |
---|
538 | return; |
---|
539 | } |
---|
540 | |
---|
541 | //get tunes for energy dP - globval.dPcommon/2 from oneturn matrix |
---|
542 | Cell_GetABGN(globval.OneTurnMat, alpha, beta, gamma, nu0); |
---|
543 | |
---|
544 | //Get cod for energy dP+globval.dPcommon |
---|
545 | GetCOD(globval.CODimax, globval.CODeps, dP + dPlocal * 0.5, lastpos); |
---|
546 | |
---|
547 | if (!status.codflag) { // if no cod |
---|
548 | fprintf(stdout, "Ring_Getchrom Lattice is unstable for" |
---|
549 | " dP+globval.dPcommon=% .5e \n", dP + dPlocal * 0.5); |
---|
550 | return; |
---|
551 | } |
---|
552 | |
---|
553 | //get tunes for energy dP+globval.dPcommon/2 from one turn matrix |
---|
554 | Cell_GetABGN(globval.OneTurnMat, alpha, beta, gamma, nu); |
---|
555 | |
---|
556 | if (!globval.stable) { |
---|
557 | printf("Ring_Getchrom: Lattice is unstable\n"); |
---|
558 | } |
---|
559 | |
---|
560 | //Get chromaticities by numerical differentiation |
---|
561 | for (j = 0; j <= 1; j++) |
---|
562 | globval.Chrom[j] = (nu[j] - nu0[j]) / globval.dPcommon; |
---|
563 | |
---|
564 | /* Get chromaticities by numerical differentiation*/ |
---|
565 | for (j = 0; j <= 1; j++) { |
---|
566 | globval.Chrom[j] = (nu[j] - nu0[j]) / dPlocal; |
---|
567 | TEMP[j] = fabs(globval.Chrom[j] - Chrom[j]); |
---|
568 | } |
---|
569 | |
---|
570 | Norm_TEMP = sqrt(TEMP[0] * TEMP[0] + TEMP[1] * TEMP[1]); |
---|
571 | NORMchro = sqrt(globval.Chrom[0] * globval.Chrom[0] + globval.Chrom[1] |
---|
572 | * globval.Chrom[1]); |
---|
573 | // if chroma closed to zero, norm is one for avoiding divergence of convergence test |
---|
574 | if (NORMchro < ZEROCHRO){ |
---|
575 | NORMchro = 1.0; |
---|
576 | } |
---|
577 | |
---|
578 | // TEST CHROMA convergence |
---|
579 | if (trace) { |
---|
580 | fprintf( |
---|
581 | stdout, |
---|
582 | "\nexpo % e xix = % e xiz = % e Norm_TEMP = %e TEMPX %+e TEMPZ %+e\n", |
---|
583 | expo, Chrom[0], Chrom[1], Norm_TEMP, TEMP[0], TEMP[1]); |
---|
584 | fprintf(stdout, "expo % e nux = % e nuz = % e dPlocal= %+e\n", |
---|
585 | expo, nu0[0], nu0[1], dP - 0.5 * dPlocal); |
---|
586 | fprintf(stdout, "expo % e nux = % e nuz = % e dPlocal= %+e\n", |
---|
587 | expo, nu[0], nu[1], dP + 0.5 * dPlocal); |
---|
588 | } |
---|
589 | expo += log(5)/LOG10; |
---|
590 | if (trace) |
---|
591 | fprintf(stdout, "%+e %+.12e %+.12e %+.12e %+.12e\n", dPlocal, |
---|
592 | globval.Chrom[0], fabs(globval.Chrom[0] - Chrom[0]) |
---|
593 | / Chrom[0], globval.Chrom[1], fabs(globval.Chrom[1] |
---|
594 | - Chrom[1]) / Chrom[1]); |
---|
595 | } while ((Norm_TEMP > chromeps * NORMchro) || (Norm_TEMP == 0e0)); |
---|
596 | |
---|
597 | status.chromflag = true; |
---|
598 | } |
---|
599 | |
---|
600 | #undef n |
---|
601 | #undef chromeps |
---|
602 | #undef LOG10 |
---|
603 | #undef ZEROCHRO |
---|
604 | |
---|
605 | |
---|
606 | /****************************************************************************/ |
---|
607 | /* static void Ring_Twiss_M(bool chroma, double dP) |
---|
608 | |
---|
609 | Purpose: called by Ring_GetTwiss |
---|
610 | Calcule les parametres Twiss a l'energie dP |
---|
611 | si chroma=true, les chromaticites sont calculees |
---|
612 | Methode matricielle |
---|
613 | |
---|
614 | M : One turn transfer matrix |
---|
615 | |
---|
616 | [ cx sx . . ] |
---|
617 | [ ] |
---|
618 | -1 [-sx cx . . ] |
---|
619 | M -> A M A = R = [ ] |
---|
620 | [ . . cy sy] |
---|
621 | [ ] |
---|
622 | [ . . -sy cy] |
---|
623 | |
---|
624 | |
---|
625 | |
---|
626 | Input: |
---|
627 | bool true if chromaticities and dispersion to compute |
---|
628 | else false |
---|
629 | dP particle energy offset |
---|
630 | |
---|
631 | Output: |
---|
632 | none |
---|
633 | |
---|
634 | Return: |
---|
635 | none |
---|
636 | |
---|
637 | Global variables: |
---|
638 | none |
---|
639 | |
---|
640 | Specific functions: |
---|
641 | none |
---|
642 | |
---|
643 | Comments: |
---|
644 | none |
---|
645 | |
---|
646 | ****************************************************************************/ |
---|
647 | #define n 4 |
---|
648 | void Ring_Twiss_M(bool chroma, double dP) |
---|
649 | { |
---|
650 | long int lastpos = 0; |
---|
651 | int j; |
---|
652 | Vector2 alpha={0.0,0.0}, beta={0.0,0.0}, gamma={0.0,0.0}, nu={0.0,0.0}; |
---|
653 | Vector eta0; |
---|
654 | Matrix R, C, Ascr; |
---|
655 | |
---|
656 | /* Get closed orbit and compute oneturn matrix */ |
---|
657 | GetCOD(globval.CODimax, globval.CODeps, dP, lastpos); |
---|
658 | |
---|
659 | if (!status.codflag) /* Check if stable */ |
---|
660 | return; |
---|
661 | /* compute twiss parameter using oneturn matrix */ |
---|
662 | Cell_GetABGN(globval.OneTurnMat, alpha, beta, gamma, nu); |
---|
663 | |
---|
664 | /* Get eigenvalues and eigenvectors for the one turn transfer matrix */ |
---|
665 | GDiag((long)n, Cell[globval.Cell_nLoc].S, globval.Ascr, globval.Ascrinv, R, |
---|
666 | globval.OneTurnMat, globval.Omega, globval.Alphac); |
---|
667 | |
---|
668 | /* Only correct for bare lattice */ |
---|
669 | for (j = 0; j <= n; j++) |
---|
670 | eta0[j] = globval.OneTurnMat[j][n]; |
---|
671 | |
---|
672 | UnitMat((long)n, C); SubMat((long)n, globval.OneTurnMat, C); |
---|
673 | |
---|
674 | if (!InvMat((long)n, C)) |
---|
675 | printf("** matrix is singular\n"); |
---|
676 | |
---|
677 | LinTrans((long)n, C, eta0); |
---|
678 | |
---|
679 | for (j = 0; j <= n; j++) { |
---|
680 | globval.Ascr[n][j] = 0.0; |
---|
681 | globval.Ascr[j][n] = eta0[j]; |
---|
682 | } |
---|
683 | |
---|
684 | CopyMat(n+1, globval.Ascr, Ascr); |
---|
685 | Cell_Twiss_M(0, globval.Cell_nLoc, Ascr, chroma, true, dP); |
---|
686 | |
---|
687 | /* Copies tunes into global variable BUG !!!*/ |
---|
688 | memcpy(globval.TotalTune, Cell[globval.Cell_nLoc].Nu, sizeof(Vector2)); |
---|
689 | status.tuneflag = true; |
---|
690 | |
---|
691 | if (chroma) |
---|
692 | { /* compute chromaticities */ |
---|
693 | Ring_Getchrom(dP); |
---|
694 | GetCOD(globval.CODimax, globval.CODeps, dP, lastpos); |
---|
695 | } |
---|
696 | } |
---|
697 | |
---|
698 | #undef n |
---|
699 | |
---|
700 | |
---|
701 | /****************************************************************************/ |
---|
702 | /* void Ring_Twiss(bool chroma, double dP) |
---|
703 | |
---|
704 | Purpose: called by Ring_GetTwiss |
---|
705 | Computes twiss parameters for an energy offset dP using da method |
---|
706 | First call GetCOD() to check whether there is a stable COD, if yes, |
---|
707 | check the linear one turn matrix is stable or not, then put the linear |
---|
708 | one turn map |
---|
709 | |
---|
710 | Input: |
---|
711 | chroma if true computes chromaticities as well |
---|
712 | dP energy offset |
---|
713 | |
---|
714 | Output: |
---|
715 | none |
---|
716 | |
---|
717 | Return: |
---|
718 | none |
---|
719 | |
---|
720 | Global variables: |
---|
721 | globval |
---|
722 | status |
---|
723 | |
---|
724 | Specific functions: |
---|
725 | none |
---|
726 | |
---|
727 | Comments: |
---|
728 | |
---|
729 | |
---|
730 | ****************************************************************************/ |
---|
731 | void Ring_Twiss(bool chroma, double dP) |
---|
732 | { |
---|
733 | long int lastpos = 0; |
---|
734 | int n = 0; |
---|
735 | Vector2 alpha={0.0, 0.0}, beta={0.0, 0.0}; |
---|
736 | Vector2 gamma={0.0, 0.0}, nu={0.0, 0.0}; |
---|
737 | Matrix R; |
---|
738 | ss_vect<tps> AScr; /* DA map*/ |
---|
739 | |
---|
740 | if (globval.Cavity_on) |
---|
741 | n = 6L; /* 6D tracking */ |
---|
742 | else /* 4D tracking */ |
---|
743 | n = 4L; |
---|
744 | |
---|
745 | if(!trace) |
---|
746 | printf("\n %d D tracking....\n",n); |
---|
747 | |
---|
748 | /* Gets closed orbit and computes one turn map around it*/ |
---|
749 | GetCOD(globval.CODimax, globval.CODeps, dP, lastpos); |
---|
750 | |
---|
751 | if (!status.codflag) |
---|
752 | return; |
---|
753 | |
---|
754 | // Check if stable |
---|
755 | Cell_GetABGN(globval.OneTurnMat, alpha, beta, gamma, nu); |
---|
756 | // Get eigenvalues and eigenvectors for the one turn transfer matrix |
---|
757 | GDiag(n, Cell[globval.Cell_nLoc].S, globval.Ascr, globval.Ascrinv, R, |
---|
758 | globval.OneTurnMat, globval.Omega, globval.Alphac); |
---|
759 | // Puts zeroes in constant part of da map |
---|
760 | putlinmat(n, globval.Ascr, AScr); |
---|
761 | |
---|
762 | if (!globval.Cavity_on) |
---|
763 | { |
---|
764 | AScr[delta_] = 0.0; |
---|
765 | AScr[ct_] = 0.0; |
---|
766 | } |
---|
767 | |
---|
768 | Cell_Twiss(0, globval.Cell_nLoc, AScr, chroma, true, dP); |
---|
769 | |
---|
770 | memcpy(globval.TotalTune, Cell[globval.Cell_nLoc].Nu, sizeof(Vector2)); |
---|
771 | status.tuneflag = true; |
---|
772 | |
---|
773 | if (chroma && !globval.Cavity_on) { |
---|
774 | Ring_Getchrom(dP); |
---|
775 | GetCOD(globval.CODimax, globval.CODeps, dP, lastpos); |
---|
776 | } |
---|
777 | } |
---|
778 | |
---|
779 | /****************************************************************************/ |
---|
780 | /* void Ring_GetTwiss(bool chroma, double dP) |
---|
781 | |
---|
782 | Purpose: |
---|
783 | Computes Twiss functions w/ or w/o chromaticities |
---|
784 | for particle of energy offset dP |
---|
785 | matrix or DA method |
---|
786 | |
---|
787 | Also get the momentum compact factor based on the definition: |
---|
788 | Alphac = delta_C/delta*1/C |
---|
789 | |
---|
790 | Input: |
---|
791 | Chroma if true, compute chromaticities and dispersion |
---|
792 | if false, dispersion is set to zero !!! |
---|
793 | Dp energy offset |
---|
794 | |
---|
795 | Output: |
---|
796 | none |
---|
797 | |
---|
798 | Return: |
---|
799 | none |
---|
800 | |
---|
801 | Global variables: |
---|
802 | globval, trace |
---|
803 | |
---|
804 | Specific functions: |
---|
805 | Ring_Twiss_M, Ring_Twiss |
---|
806 | |
---|
807 | Comments: |
---|
808 | none |
---|
809 | |
---|
810 | ****************************************************************************/ |
---|
811 | void Ring_GetTwiss(bool chroma, double dP) |
---|
812 | { |
---|
813 | |
---|
814 | if (trace) printf("enter ring_gettwiss\n"); |
---|
815 | |
---|
816 | if (globval.MatMeth) /* matrix method */ |
---|
817 | Ring_Twiss_M(chroma, dP); |
---|
818 | else /* da method */ |
---|
819 | Ring_Twiss(chroma, dP); |
---|
820 | |
---|
821 | globval.Alphac = globval.OneTurnMat[ct_][delta_]/Cell[globval.Cell_nLoc].S; |
---|
822 | if (trace) printf("exit ring_gettwiss\n"); |
---|
823 | } |
---|
824 | |
---|
825 | |
---|
826 | /* Local variables for Ring_Fittune: */ |
---|
827 | struct LOC_Ring_Fittune |
---|
828 | { |
---|
829 | jmp_buf _JL999; |
---|
830 | }; |
---|
831 | |
---|
832 | |
---|
833 | /****************************************************************************/ |
---|
834 | /* void TransTrace(long i0, long i1, Vector2 &alpha, Vector2 &beta, Vector2 &eta, |
---|
835 | Vector2 &etap, double *codvect) |
---|
836 | |
---|
837 | Purpose: TransTwiss |
---|
838 | Compute Twiss fonction for a tranfert line from element i0 to element i1 |
---|
839 | |
---|
840 | Input: |
---|
841 | alpha alpha fonctions at the line entrance |
---|
842 | beta beta fonctions at the line entrance |
---|
843 | eta disperion fonctions at the line entrance |
---|
844 | etap dipersion derivatives fonctions at the line entrance |
---|
845 | codvect closed orbit fonctions at the line entrance |
---|
846 | |
---|
847 | Output: |
---|
848 | none |
---|
849 | |
---|
850 | Return: |
---|
851 | none |
---|
852 | |
---|
853 | Global variables: |
---|
854 | globval, trace |
---|
855 | |
---|
856 | Specific functions: |
---|
857 | Cell_Twiss_M, Cell_Pass_M |
---|
858 | |
---|
859 | Comments: |
---|
860 | 28/10/03 phase advances added |
---|
861 | |
---|
862 | ****************************************************************************/ |
---|
863 | void TransTrace(long i0, long i1, Vector2 &alpha, Vector2 &beta, Vector2 &eta, |
---|
864 | Vector2 &etap, Vector &codvect) |
---|
865 | { |
---|
866 | long i=0L, j=0L, lastpos=0L; |
---|
867 | double sb=0.0; |
---|
868 | Matrix Ascr; /* 6*6 transfer matrix*/ |
---|
869 | |
---|
870 | UnitMat(6L, Ascr); |
---|
871 | for (i = 1; i <= 2L; i++) { |
---|
872 | sb = sqrt(beta[i-1]); j = i*2 - 1; |
---|
873 | Ascr[j-1][j-1] = sb; Ascr[j-1][j] = 0.0; |
---|
874 | Ascr[j][j-1] = -(alpha[i-1]/sb); Ascr[j][j] = 1/sb; |
---|
875 | } |
---|
876 | Ascr[0][4] = eta[0]; Ascr[1][4] = etap[0]; |
---|
877 | Ascr[2][4] = eta[1]; Ascr[3][4] = etap[1]; |
---|
878 | |
---|
879 | for (i = 0; i < ss_dim; i++) { |
---|
880 | globval.CODvect[i] = codvect[i]; |
---|
881 | } |
---|
882 | |
---|
883 | // get twiss parameter for each element |
---|
884 | Cell_Twiss_M(i0, i1, Ascr, false, false, codvect[4]); |
---|
885 | memcpy(globval.TotalTune, Cell[globval.Cell_nLoc].Nu, sizeof(Vector2)); |
---|
886 | status.tuneflag = true; |
---|
887 | |
---|
888 | for (i = 0; i < ss_dim; i++) { |
---|
889 | globval.CODvect[i] = codvect[i]; |
---|
890 | } |
---|
891 | |
---|
892 | // compute oneturn matrix |
---|
893 | UnitMat(5L, globval.OneTurnMat); |
---|
894 | Cell_Pass_M(0, globval.Cell_nLoc, globval.CODvect, globval.OneTurnMat, |
---|
895 | lastpos); |
---|
896 | } |
---|
897 | |
---|
898 | /****************************************************************************/ |
---|
899 | /* void shiftk(long Elnum, double dk, struct LOC_Ring_Fittune *LINK) |
---|
900 | |
---|
901 | Purpose: |
---|
902 | |
---|
903 | |
---|
904 | Input: |
---|
905 | none |
---|
906 | |
---|
907 | Output: |
---|
908 | none |
---|
909 | |
---|
910 | Return: |
---|
911 | none |
---|
912 | |
---|
913 | Global variables: |
---|
914 | none |
---|
915 | |
---|
916 | Specific functions: |
---|
917 | none |
---|
918 | |
---|
919 | Comments: |
---|
920 | none |
---|
921 | |
---|
922 | ****************************************************************************/ |
---|
923 | #define dP 0.0 |
---|
924 | void shiftk(long Elnum, double dk, struct LOC_Ring_Fittune *LINK) |
---|
925 | { |
---|
926 | CellType *cellp; |
---|
927 | elemtype *elemp; |
---|
928 | MpoleType *M; |
---|
929 | |
---|
930 | cellp = &Cell[Elnum]; elemp = &cellp->Elem; M = elemp->M; |
---|
931 | M->PBpar[Quad+HOMmax] += dk; |
---|
932 | Mpole_SetPB(cellp->Fnum, cellp->Knum, (long)Quad); |
---|
933 | } |
---|
934 | |
---|
935 | |
---|
936 | /****************************************************************************/ |
---|
937 | /* void checkifstable(struct LOC_Ring_Fittune *LINK) |
---|
938 | |
---|
939 | Purpose: |
---|
940 | |
---|
941 | |
---|
942 | Input: |
---|
943 | none |
---|
944 | |
---|
945 | Output: |
---|
946 | none |
---|
947 | |
---|
948 | Return: |
---|
949 | none |
---|
950 | |
---|
951 | Global variables: |
---|
952 | none |
---|
953 | |
---|
954 | Specific functions: |
---|
955 | none |
---|
956 | |
---|
957 | Comments: |
---|
958 | none |
---|
959 | |
---|
960 | ****************************************************************************/ |
---|
961 | void checkifstable(struct LOC_Ring_Fittune *LINK) |
---|
962 | { |
---|
963 | if (!globval.stable) { |
---|
964 | printf(" lattice is unstable\n"); |
---|
965 | longjmp(LINK->_JL999, 1); |
---|
966 | } |
---|
967 | } |
---|
968 | |
---|
969 | |
---|
970 | /****************************************************************************/ |
---|
971 | /* void Ring_Fittune(Vector2 &nu, double eps, long *nq, long *qf, long *qd, |
---|
972 | double dkL, long imax) |
---|
973 | |
---|
974 | Purpose: called by fittune |
---|
975 | Fit tunes using two family of quadrupoles |
---|
976 | Linear method |
---|
977 | |
---|
978 | Input: |
---|
979 | nu target tunes |
---|
980 | eps precision |
---|
981 | nq number of quad of family qf and qd |
---|
982 | qf position of qf magnets |
---|
983 | qd position of qd magnets |
---|
984 | dKL variation on strengths |
---|
985 | imax maximum number of iteration |
---|
986 | |
---|
987 | Output: |
---|
988 | none |
---|
989 | |
---|
990 | Return: |
---|
991 | none |
---|
992 | |
---|
993 | Global variables: |
---|
994 | none |
---|
995 | |
---|
996 | Specific functions: |
---|
997 | none |
---|
998 | |
---|
999 | Comments: |
---|
1000 | 17 mars 2004: removed labels |
---|
1001 | |
---|
1002 | ****************************************************************************/ |
---|
1003 | void Ring_Fittune(Vector2 &nu, double eps, iVector2 &nq, long qf[], long qd[], |
---|
1004 | double dkL, long imax) |
---|
1005 | { |
---|
1006 | struct LOC_Ring_Fittune V; |
---|
1007 | |
---|
1008 | int i, j, k; |
---|
1009 | Vector2 nu0, nu1; |
---|
1010 | Vector dkL1, dnu; |
---|
1011 | Matrix A; |
---|
1012 | bool prt = false; |
---|
1013 | |
---|
1014 | if (setjmp(V._JL999)) return; |
---|
1015 | |
---|
1016 | if (trace) |
---|
1017 | printf(" Tune fit, nux =%10.5f, nuy =%10.5f, eps =% .3E," |
---|
1018 | " imax =%4ld, dkL = % .5E\n", nu[0], nu[1], eps, imax, dkL); |
---|
1019 | Ring_GetTwiss(false, dP); checkifstable(&V); |
---|
1020 | memcpy(nu0, globval.TotalTune, sizeof(Vector2)); |
---|
1021 | i = 0; |
---|
1022 | do { |
---|
1023 | i++; |
---|
1024 | /* First vary kf then kd */ |
---|
1025 | for (j = 1; j <= 2L; j++) { |
---|
1026 | for (k = 0; k < nq[j-1]; k++) { |
---|
1027 | if (j == 1) |
---|
1028 | shiftk(qf[k], dkL, &V); // new value for qf |
---|
1029 | else |
---|
1030 | shiftk(qd[k], dkL, &V); // new value for qd |
---|
1031 | } |
---|
1032 | Ring_GetTwiss(false, dP); |
---|
1033 | nu1[0] = globval.TotalTune[0]; nu1[1] = globval.TotalTune[1]; |
---|
1034 | checkifstable(&V); |
---|
1035 | for (k = 0; k <= 1; k++) { |
---|
1036 | dnu[k] = nu1[k] - (long)nu1[k] - nu0[k] + (long)nu0[k]; |
---|
1037 | if (fabs(dnu[k]) > 0.5) dnu[k] = 1 - fabs(dnu[k]); |
---|
1038 | A[k][j-1] = dnu[k]/dkL; |
---|
1039 | } |
---|
1040 | |
---|
1041 | /* Restore strength */ |
---|
1042 | for (k = 0; k < nq[j-1]; k++) { |
---|
1043 | if (j == 1) |
---|
1044 | shiftk(qf[k], -dkL, &V); |
---|
1045 | else |
---|
1046 | shiftk(qd[k], -dkL, &V); |
---|
1047 | } |
---|
1048 | } |
---|
1049 | |
---|
1050 | if (!InvMat(2L, A)) { |
---|
1051 | printf(" A is singular\n"); |
---|
1052 | return; |
---|
1053 | } |
---|
1054 | |
---|
1055 | for (j = 0; j <= 1; j++) |
---|
1056 | dkL1[j] = nu[j] - nu0[j]; |
---|
1057 | LinTrans(2L, A, dkL1); |
---|
1058 | for (j = 1; j <= 2; j++) { |
---|
1059 | for (k = 0; k < nq[j-1]; k++) { |
---|
1060 | if (j == 1) |
---|
1061 | shiftk(qf[k], dkL1[j-1], &V); |
---|
1062 | else |
---|
1063 | shiftk(qd[k], dkL1[j-1], &V); |
---|
1064 | } |
---|
1065 | } |
---|
1066 | Ring_GetTwiss(false, dP); checkifstable(&V); |
---|
1067 | memcpy(nu0, globval.TotalTune, sizeof(Vector2)); |
---|
1068 | if (trace) |
---|
1069 | printf(" Nux = %10.6f(%10.6f), Nuy = %10.6f(%10.6f)," |
---|
1070 | " QFam1*L = % .5E, QFam2*L = % .5E @%3d\n", |
---|
1071 | nu0[0], nu1[0], nu0[1], nu1[1], |
---|
1072 | Elem_GetKval(Cell[qf[0]].Fnum, 1, (long)Quad), |
---|
1073 | Elem_GetKval(Cell[qd[0]].Fnum, 1, (long)Quad), i); |
---|
1074 | } while (sqrt(sqr(nu[0]-nu0[0])+sqr(nu[1]-nu0[1])) >= eps && i != imax); |
---|
1075 | if (prt) |
---|
1076 | // print new K-value for 1s element of the family |
---|
1077 | printf("Reached Nux = %10.6f, Nuy = %10.6f," |
---|
1078 | " QFam1*L = % .5E, QFam2*L = % .5E @iteration %3d\n", |
---|
1079 | nu[0], nu[1], |
---|
1080 | Elem_GetKval(Cell[qf[0]].Fnum, 1, (long)Quad), |
---|
1081 | Elem_GetKval(Cell[qd[0]].Fnum, 1, (long)Quad), i); |
---|
1082 | } |
---|
1083 | #undef dP |
---|
1084 | |
---|
1085 | |
---|
1086 | #define dP 0.0 |
---|
1087 | void shiftkp(long Elnum, double dkp) |
---|
1088 | { |
---|
1089 | CellType *cellp; |
---|
1090 | elemtype *elemp; |
---|
1091 | MpoleType *M; |
---|
1092 | |
---|
1093 | cellp = &Cell[Elnum]; elemp = &cellp->Elem; M = elemp->M; |
---|
1094 | M->PBpar[Sext+HOMmax] += dkp; |
---|
1095 | Mpole_SetPB(cellp->Fnum, cellp->Knum, (long)Sext); |
---|
1096 | } |
---|
1097 | |
---|
1098 | |
---|
1099 | void Ring_Fitchrom(Vector2 &ksi, double eps, iVector2 &ns, |
---|
1100 | long sf[], long sd[], double dkpL, long imax) |
---|
1101 | { |
---|
1102 | bool rad; |
---|
1103 | long int lastpos; |
---|
1104 | int i, j, k; |
---|
1105 | Vector2 ksi0; |
---|
1106 | Vector dkpL1, dksi; |
---|
1107 | Matrix A; |
---|
1108 | |
---|
1109 | if (trace) |
---|
1110 | printf(" Chromaticity fit, ksix =%10.5f, ksiy =%10.5f, eps =% .3E" |
---|
1111 | ", imax =%4ld, dkpL =%10.5f\n", ksi[0], ksi[1], eps, imax, dkpL); |
---|
1112 | |
---|
1113 | /* Turn off radiation */ |
---|
1114 | rad = globval.radiation; globval.radiation = false; |
---|
1115 | GetCOD(globval.CODimax, globval.CODeps, dP, lastpos); Ring_Getchrom(dP); |
---|
1116 | for (j = 0; j <= 1; j++) |
---|
1117 | ksi0[j] = globval.Chrom[j]; |
---|
1118 | i = 0; |
---|
1119 | do { |
---|
1120 | i++; |
---|
1121 | /* First vary sf then sd */ |
---|
1122 | for (j = 1; j <= 2; j++) { |
---|
1123 | for (k = 0; k < ns[j-1]; k++) { |
---|
1124 | if (j == 1) |
---|
1125 | shiftkp(sf[k], dkpL); |
---|
1126 | else |
---|
1127 | shiftkp(sd[k], dkpL); |
---|
1128 | } |
---|
1129 | GetCOD(globval.CODimax, globval.CODeps, dP, lastpos); Ring_Getchrom(dP); |
---|
1130 | for (k = 0; k <= 1; k++) { |
---|
1131 | dksi[k] = globval.Chrom[k] - ksi0[k]; |
---|
1132 | A[k][j-1] = dksi[k] / dkpL; |
---|
1133 | } |
---|
1134 | /* Restore strength */ |
---|
1135 | for (k = 0; k < ns[j-1]; k++) { |
---|
1136 | if (j == 1) |
---|
1137 | shiftkp(sf[k], -dkpL); |
---|
1138 | else |
---|
1139 | shiftkp(sd[k], -dkpL); |
---|
1140 | } |
---|
1141 | } |
---|
1142 | if (!InvMat(2L, A)) { |
---|
1143 | printf(" A is singular\n"); |
---|
1144 | goto _L999; |
---|
1145 | } |
---|
1146 | for (j = 0; j <= 1; j++) |
---|
1147 | dkpL1[j] = ksi[j] - ksi0[j]; |
---|
1148 | LinTrans(2L, A, dkpL1); |
---|
1149 | for (j = 1; j <= 2; j++) { |
---|
1150 | for (k = 0; k < ns[j-1]; k++) { |
---|
1151 | if (j == 1) |
---|
1152 | shiftkp(sf[k], dkpL1[j-1]); |
---|
1153 | else |
---|
1154 | shiftkp(sd[k], dkpL1[j-1]); |
---|
1155 | } |
---|
1156 | } |
---|
1157 | GetCOD(globval.CODimax, globval.CODeps, dP, lastpos); Ring_Getchrom(dP); |
---|
1158 | for (j = 0; j <= 1; j++) |
---|
1159 | ksi0[j] = globval.Chrom[j]; |
---|
1160 | if (trace) |
---|
1161 | printf(" ksix =%10.6f, ksiy =%10.6f, SF = % .5E, SD = % .5E @%3d\n", |
---|
1162 | ksi0[0], ksi0[1], Elem_GetKval(Cell[sf[0]].Fnum, 1, (long)Sext), |
---|
1163 | Elem_GetKval(Cell[sd[0]].Fnum, 1, (long)Sext), i); |
---|
1164 | } while (sqrt(sqr(ksi[0]-ksi0[0])+sqr(ksi[1]-ksi0[1])) >= eps && i != imax); |
---|
1165 | _L999: |
---|
1166 | /* Restore radiation */ |
---|
1167 | globval.radiation = rad; |
---|
1168 | } |
---|
1169 | |
---|
1170 | #undef dP |
---|
1171 | |
---|
1172 | |
---|
1173 | #define dP 0.0 |
---|
1174 | |
---|
1175 | |
---|
1176 | /* Local variables for Ring_FitDisp: */ |
---|
1177 | struct LOC_Ring_FitDisp |
---|
1178 | { |
---|
1179 | jmp_buf _JL999; |
---|
1180 | }; |
---|
1181 | |
---|
1182 | |
---|
1183 | static void shiftk_(long Elnum, double dk, struct LOC_Ring_FitDisp *LINK) |
---|
1184 | { |
---|
1185 | CellType *cellp; |
---|
1186 | elemtype *elemp; |
---|
1187 | MpoleType *M; |
---|
1188 | |
---|
1189 | cellp = &Cell[Elnum]; |
---|
1190 | elemp = &cellp->Elem; |
---|
1191 | M = elemp->M; |
---|
1192 | M->PBpar[Quad+HOMmax] += dk; |
---|
1193 | Mpole_SetPB(cellp->Fnum, cellp->Knum, (long)Quad); |
---|
1194 | } |
---|
1195 | |
---|
1196 | |
---|
1197 | void checkifstable_(struct LOC_Ring_FitDisp *LINK) |
---|
1198 | { |
---|
1199 | if (!globval.stable) { |
---|
1200 | printf(" lattice is unstable\n"); |
---|
1201 | longjmp(LINK->_JL999, 1); |
---|
1202 | } |
---|
1203 | } |
---|
1204 | |
---|
1205 | |
---|
1206 | void Ring_FitDisp(long pos, double eta, double eps, long nq, long q[], |
---|
1207 | double dkL, long imax) |
---|
1208 | { |
---|
1209 | /*pos : integer; eta, eps : double; |
---|
1210 | nq : integer; var q : fitvect; |
---|
1211 | dkL : double; imax : integer*/ |
---|
1212 | struct LOC_Ring_FitDisp V; |
---|
1213 | |
---|
1214 | int i, j; |
---|
1215 | double dkL1, Eta0, deta; |
---|
1216 | bool rad = false; |
---|
1217 | |
---|
1218 | if (setjmp(V._JL999)) goto _L999; |
---|
1219 | |
---|
1220 | if (trace) |
---|
1221 | printf(" Dispersion fit, etax =%10.5f, eps =% .3E" |
---|
1222 | ", imax =%4ld, dkL =%10.5f\n", |
---|
1223 | eta, eps, imax, dkL); |
---|
1224 | /* Turn off radiation */ |
---|
1225 | rad = globval.radiation; globval.radiation = false; |
---|
1226 | Ring_GetTwiss(true, dP); checkifstable_(&V); |
---|
1227 | Eta0 = Cell[pos].Eta[0]; |
---|
1228 | i = 0; |
---|
1229 | while (fabs(eta-Eta0) > eps && i < imax) { |
---|
1230 | i++; |
---|
1231 | for (j = 0; j < nq; j++) |
---|
1232 | shiftk_(q[j], dkL, &V); |
---|
1233 | Ring_GetTwiss(true, dP); checkifstable_(&V); |
---|
1234 | deta = Cell[pos].Eta[0] - Eta0; |
---|
1235 | if (deta == 0.0) { |
---|
1236 | printf(" deta is 0\n"); |
---|
1237 | goto _L999; |
---|
1238 | } |
---|
1239 | dkL1 = (eta-Eta0)*dkL/deta - dkL; |
---|
1240 | for (j = 0; j < nq; j++) |
---|
1241 | shiftk_(q[j], dkL1, &V); |
---|
1242 | Ring_GetTwiss(true, dP); checkifstable_(&V); |
---|
1243 | Eta0 = Cell[pos].Eta[0]; |
---|
1244 | if (trace) |
---|
1245 | printf(" Dispersion = % .5E, kL =% .5E @%3d\n", |
---|
1246 | Eta0, Elem_GetKval(Cell[q[0]].Fnum, 1, (long)Quad), i); |
---|
1247 | } |
---|
1248 | _L999: |
---|
1249 | /* Restore radiation */ |
---|
1250 | globval.radiation = rad; |
---|
1251 | } |
---|
1252 | #undef dP |
---|
1253 | |
---|
1254 | /* End. */ |
---|