1 | #include "mex.h" |
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2 | #include<math.h> |
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3 | #include "elempass.h" |
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4 | #include "../atlalib.c" |
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5 | |
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6 | |
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7 | #define DRIFT1 0.6756035959798286638 |
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8 | #define DRIFT2 -0.1756035959798286639 |
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9 | #define KICK1 1.351207191959657328 |
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10 | #define KICK2 -1.702414383919314656 |
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11 | |
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12 | |
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13 | |
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14 | void strthinkick(double* r, double* A, double* B, double L, int max_order) |
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15 | /***************************************************************************** |
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16 | Calculate and apply a multipole kick to a 6-dimentional |
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17 | phase space vector in a straight element ( quadrupole) |
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18 | |
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19 | IMPORTANT !!! |
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20 | The reference coordinate system is straight but the field expansion may still |
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21 | contain dipole terms: PolynomA(1), PolynomB(1) - in MATLAB notation, |
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22 | A[0], B[0] - C,C++ notation |
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23 | |
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24 | |
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25 | Note: in the US convention the transverse multipole field is written as: |
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26 | |
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27 | max_order+1 |
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28 | ---- |
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29 | \ n-1 |
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30 | (B + iB )/ B rho = > (ia + b ) (x + iy) |
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31 | y x / n n |
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32 | ---- |
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33 | n=1 |
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34 | is a polynomial in (x,y) with the highest order = MaxOrder |
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35 | |
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36 | |
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37 | Using different index notation |
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38 | |
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39 | max_order |
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40 | ---- |
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41 | \ n |
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42 | (B + iB )/ B rho = > (iA + B ) (x + iy) |
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43 | y x / n n |
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44 | ---- |
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45 | n=0 |
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46 | |
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47 | A,B: i=0 ... max_order |
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48 | [0] - dipole, [1] - quadrupole, [2] - sextupole ... |
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49 | units for A,B[i] = 1/[m]^(i+1) |
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50 | Coeficients are stroed in the PolynomA, PolynomB field of the element |
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51 | structure in MATLAB |
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52 | |
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53 | A[i] (C++,C) = PolynomA(i+1) (MATLAB) |
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54 | B[i] (C++,C) = PolynomB(i+1) (MATLAB) |
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55 | i = 0 .. MaxOrder |
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56 | |
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57 | ******************************************************************************/ |
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58 | { int i; |
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59 | double ReSum = B[max_order]; |
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60 | double ImSum = A[max_order]; |
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61 | double ReSumTemp; |
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62 | for(i=max_order-1;i>=0;i--) |
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63 | { ReSumTemp = ReSum*r[0] - ImSum*r[2] + B[i]; |
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64 | ImSum = ImSum*r[0] + ReSum*r[2] + A[i]; |
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65 | ReSum = ReSumTemp; |
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66 | } |
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67 | |
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68 | r[1] -= L*ReSum; |
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69 | r[3] += L*ImSum; |
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70 | } |
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71 | |
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72 | void fastdrift(double* r, double NormL) |
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73 | |
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74 | /* NormL=(Physical Length)/(1+delta) is computed externally to speed up calculations |
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75 | in the loop if momentum deviation (delta) does not change |
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76 | such as in 4-th order symplectic integrator w/o radiation |
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77 | */ |
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78 | |
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79 | { double dx = NormL*r[1]; |
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80 | double dy = NormL*r[3]; |
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81 | r[0]+= dx; |
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82 | r[2]+= dy; |
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83 | r[5]+= NormL*(r[1]*r[1]+r[3]*r[3])/(2*(1+r[4])); |
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84 | } |
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85 | |
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86 | void StrMPoleSymplectic4Pass(double *r, double le, double *A, double *B, |
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87 | int max_order, int num_int_steps, |
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88 | double *T1, double *T2, |
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89 | double *R1, double *R2, int num_particles) |
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90 | { int c,m; |
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91 | double norm, NormL1, NormL2; |
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92 | double *r6; |
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93 | bool useT1, useT2, useR1, useR2; |
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94 | double SL, L1, L2, K1, K2; |
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95 | SL = le/num_int_steps; |
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96 | L1 = SL*DRIFT1; |
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97 | L2 = SL*DRIFT2; |
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98 | K1 = SL*KICK1; |
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99 | K2 = SL*KICK2; |
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100 | |
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101 | if(T1==NULL) |
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102 | useT1=false; |
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103 | else |
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104 | useT1=true; |
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105 | |
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106 | if(T2==NULL) |
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107 | useT2=false; |
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108 | else |
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109 | useT2=true; |
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110 | |
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111 | if(R1==NULL) |
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112 | useR1=false; |
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113 | else |
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114 | useR1=true; |
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115 | |
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116 | if(R2==NULL) |
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117 | useR2=false; |
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118 | else |
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119 | useR2=true; |
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120 | for(c = 0;c<num_particles;c++) /*Loop over particles */ |
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121 | { r6 = r+c*6; |
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122 | if(!mxIsNaN(r6[0])) |
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123 | { |
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124 | /* misalignment at entrance */ |
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125 | if(useT1) |
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126 | ATaddvv(r6,T1); |
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127 | if(useR1) |
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128 | ATmultmv(r6,R1); |
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129 | /* integrator */ |
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130 | for(m=0; m < num_int_steps; m++) /* Loop over slices */ |
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131 | { r6 = r+c*6; |
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132 | norm = 1/(1+r6[4]); |
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133 | NormL1 = L1*norm; |
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134 | NormL2 = L2*norm; |
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135 | fastdrift(r6, NormL1); |
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136 | strthinkick(r6, A, B, K1, max_order); |
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137 | fastdrift(r6, NormL2); |
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138 | strthinkick(r6, A, B, K2, max_order); |
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139 | fastdrift(r6, NormL2); |
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140 | strthinkick(r6, A, B, K1, max_order); |
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141 | fastdrift(r6, NormL1); |
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142 | } |
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143 | |
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144 | /* Misalignment at exit */ |
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145 | if(useR2) |
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146 | ATmultmv(r6,R2); |
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147 | if(useT2) |
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148 | ATaddvv(r6,T2); |
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149 | } |
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150 | } |
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151 | } |
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152 | |
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153 | |
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154 | |
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155 | ExportMode int* passFunction(const mxArray *ElemData, int *FieldNumbers, |
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156 | double *r_in, int num_particles, int mode) |
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157 | #define NUM_FIELDS_2_REMEMBER 10 |
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158 | { int fnum; |
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159 | double *A , *B; |
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160 | double *pr1, *pr2, *pt1, *pt2, *ka; |
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161 | int max_order, num_int_steps; |
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162 | double le; |
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163 | int *returnptr; |
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164 | int *NewFieldNumbers; |
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165 | |
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166 | switch(mode) |
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167 | { case NO_LOCAL_COPY: /* NOT used in AT1.3 Get fields by names from MATLAB workspace */ |
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168 | { |
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169 | |
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170 | } break; |
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171 | |
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172 | case MAKE_LOCAL_COPY: /* Find field numbers first |
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173 | Save a list of field number in an array |
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174 | and make returnptr point to that array |
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175 | */ |
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176 | { |
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177 | /* Allocate memory for integer array of |
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178 | field numbers for faster futurereference |
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179 | */ |
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180 | NewFieldNumbers = (int*)mxCalloc(NUM_FIELDS_2_REMEMBER,sizeof(int)); |
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181 | |
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182 | /* Populate */ |
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183 | |
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184 | fnum = mxGetFieldNumber(ElemData,"PolynomA"); |
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185 | if(fnum<0) |
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186 | mexErrMsgTxt("Required field 'PolynomA' was not found in the element data structure"); |
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187 | NewFieldNumbers[0] = fnum; |
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188 | A = mxGetPr(mxGetFieldByNumber(ElemData,0,fnum)); |
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189 | |
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190 | |
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191 | fnum = mxGetFieldNumber(ElemData,"PolynomB"); |
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192 | if(fnum<0) |
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193 | mexErrMsgTxt("Required field 'PolynomB' was not found in the element data structure"); |
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194 | NewFieldNumbers[1] = fnum; |
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195 | B = mxGetPr(mxGetFieldByNumber(ElemData,0,fnum)); |
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196 | |
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197 | |
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198 | |
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199 | fnum = mxGetFieldNumber(ElemData,"MaxOrder"); |
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200 | if(fnum<0) |
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201 | mexErrMsgTxt("Required field 'MaxOrder' was not found in the element data structure"); |
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202 | NewFieldNumbers[2] = fnum; |
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203 | max_order = (int)mxGetScalar(mxGetFieldByNumber(ElemData,0,fnum)); |
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204 | |
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205 | |
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206 | fnum = mxGetFieldNumber(ElemData,"NumIntSteps"); |
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207 | if(fnum<0) |
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208 | mexErrMsgTxt("Required field 'NumIntSteps' was not found in the element data structure"); |
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209 | NewFieldNumbers[3] = fnum; |
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210 | num_int_steps = (int)mxGetScalar(mxGetFieldByNumber(ElemData,0,fnum)); |
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211 | |
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212 | |
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213 | fnum = mxGetFieldNumber(ElemData,"Length"); |
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214 | if(fnum<0) |
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215 | mexErrMsgTxt("Required field 'Length' was not found in the element data structure"); |
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216 | NewFieldNumbers[4] = fnum; |
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217 | le = mxGetScalar(mxGetFieldByNumber(ElemData,0,fnum)); |
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218 | |
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219 | fnum = mxGetFieldNumber(ElemData,"R1"); |
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220 | NewFieldNumbers[5] = fnum; |
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221 | if(fnum<0) |
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222 | pr1 = NULL; |
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223 | else |
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224 | pr1 = mxGetPr(mxGetFieldByNumber(ElemData,0,fnum)); |
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225 | |
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226 | |
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227 | fnum = mxGetFieldNumber(ElemData,"R2"); |
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228 | NewFieldNumbers[6] = fnum; |
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229 | if(fnum<0) |
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230 | pr2 = NULL; |
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231 | else |
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232 | pr2 = mxGetPr(mxGetFieldByNumber(ElemData,0,fnum)); |
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233 | |
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234 | fnum = mxGetFieldNumber(ElemData,"T1"); |
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235 | NewFieldNumbers[7] = fnum; |
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236 | if(fnum<0) |
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237 | pt1 = NULL; |
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238 | else |
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239 | pt1 = mxGetPr(mxGetFieldByNumber(ElemData,0,fnum)); |
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240 | |
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241 | fnum = mxGetFieldNumber(ElemData,"T2"); |
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242 | NewFieldNumbers[8] = fnum; |
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243 | if(fnum<0) |
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244 | pt2 = NULL; |
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245 | else |
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246 | pt2 = mxGetPr(mxGetFieldByNumber(ElemData,0,fnum)); |
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247 | |
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248 | /* Optional: Kick angles, see section below for explanation */ |
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249 | /* Kicks from multipole elements can be specified as angles. This handles the |
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250 | case where corrector coils are used in sextupoles and used for orbit |
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251 | correction. */ |
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252 | fnum = mxGetFieldNumber(ElemData,"KickAngle"); |
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253 | NewFieldNumbers[9] = fnum; |
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254 | if(fnum<0) |
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255 | ka = NULL; |
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256 | else |
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257 | ka = mxGetPr(mxGetFieldByNumber(ElemData,0,fnum)); |
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258 | |
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259 | returnptr = NewFieldNumbers; |
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260 | |
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261 | } break; |
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262 | |
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263 | case USE_LOCAL_COPY: /* Get fields from MATLAB using field numbers |
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264 | The second argument ponter to the array of field |
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265 | numbers is previously created with |
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266 | QuadLinPass( ..., MAKE_LOCAL_COPY) |
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267 | |
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268 | */ |
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269 | { A = mxGetPr(mxGetFieldByNumber(ElemData,0,FieldNumbers[0])); |
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270 | B = mxGetPr(mxGetFieldByNumber(ElemData,0,FieldNumbers[1])); |
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271 | max_order = (int)mxGetScalar(mxGetFieldByNumber(ElemData,0,FieldNumbers[2])); |
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272 | num_int_steps = (int)mxGetScalar(mxGetFieldByNumber(ElemData,0,FieldNumbers[3])); |
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273 | le = mxGetScalar(mxGetFieldByNumber(ElemData,0,FieldNumbers[4])); |
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274 | |
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275 | /* Optional fields */ |
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276 | if(FieldNumbers[5]<0) |
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277 | pr1 = NULL; |
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278 | else |
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279 | pr1 = mxGetPr(mxGetFieldByNumber(ElemData,0,FieldNumbers[5])); |
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280 | |
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281 | if(FieldNumbers[6]<0) |
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282 | pr2 = NULL; |
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283 | else |
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284 | pr2 = mxGetPr(mxGetFieldByNumber(ElemData,0,FieldNumbers[6])); |
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285 | |
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286 | if(FieldNumbers[7]<0) |
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287 | pt1 = NULL; |
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288 | else |
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289 | pt1 = mxGetPr(mxGetFieldByNumber(ElemData,0,FieldNumbers[7])); |
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290 | |
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291 | if(FieldNumbers[8]<0) |
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292 | pt2 = NULL; |
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293 | else |
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294 | pt2 = mxGetPr(mxGetFieldByNumber(ElemData,0,FieldNumbers[8])); |
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295 | |
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296 | if(FieldNumbers[9]<0) |
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297 | ka = NULL; |
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298 | else |
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299 | ka = mxGetPr(mxGetFieldByNumber(ElemData,0,FieldNumbers[9])); |
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300 | |
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301 | returnptr = FieldNumbers; |
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302 | } break; |
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303 | default: |
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304 | { mexErrMsgTxt("No match for calling mode in function StrMPoleSymplectic4Pass\n"); |
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305 | } |
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306 | } |
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307 | |
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308 | |
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309 | if(ka!=NULL) |
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310 | { |
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311 | /* Positive angle must correspond to -ve B field since +ve B field corresponds |
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312 | to a bend with the same curvature as the bend magnets. |
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313 | */ |
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314 | B[0] -= sin(ka[0])/le; |
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315 | A[0] += sin(ka[1])/le; |
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316 | } |
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317 | |
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318 | StrMPoleSymplectic4Pass(r_in, le, A, B, max_order, num_int_steps,pt1, pt2, pr1, pr2, num_particles); |
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319 | |
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320 | if(ka!=NULL) |
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321 | { |
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322 | B[0] += sin(ka[0])/le; |
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323 | A[0] -= sin(ka[1])/le; |
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324 | } |
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325 | |
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326 | return(returnptr); |
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327 | } |
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328 | |
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329 | void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[]) |
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330 | { int m,n; |
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331 | double *r_in; |
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332 | double le, *A, *B, *pr1, *pr2, *pt1, *pt2, *ka; |
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333 | int max_order, num_int_steps; |
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334 | mxArray *tmpmxptr; |
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335 | |
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336 | if(nrhs) |
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337 | { |
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338 | /* ALLOCATE memory for the output array of the same size as the input */ |
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339 | m = mxGetM(prhs[1]); |
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340 | n = mxGetN(prhs[1]); |
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341 | if(m!=6) |
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342 | mexErrMsgTxt("Second argument must be a 6 x N matrix"); |
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343 | |
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344 | |
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345 | tmpmxptr =mxGetField(prhs[0],0,"PolynomA"); |
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346 | if(tmpmxptr) |
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347 | A = mxGetPr(tmpmxptr); |
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348 | else |
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349 | mexErrMsgTxt("Required field 'PolynomA' was not found in the element data structure"); |
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350 | |
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351 | tmpmxptr =mxGetField(prhs[0],0,"PolynomB"); |
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352 | if(tmpmxptr) |
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353 | B = mxGetPr(tmpmxptr); |
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354 | else |
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355 | mexErrMsgTxt("Required field 'PolynomB' was not found in the element data structure"); |
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356 | |
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357 | tmpmxptr = mxGetField(prhs[0],0,"MaxOrder"); |
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358 | if(tmpmxptr) |
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359 | max_order = (int)mxGetScalar(tmpmxptr); |
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360 | else |
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361 | mexErrMsgTxt("Required field 'MaxOrder' was not found in the element data structure"); |
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362 | |
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363 | tmpmxptr = mxGetField(prhs[0],0,"NumIntSteps"); |
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364 | if(tmpmxptr) |
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365 | num_int_steps = (int)mxGetScalar(tmpmxptr); |
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366 | else |
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367 | mexErrMsgTxt("Required field 'NumIntSteps' was not found in the element data structure"); |
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368 | |
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369 | tmpmxptr = mxGetField(prhs[0],0,"Length"); |
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370 | if(tmpmxptr) |
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371 | le = mxGetScalar(tmpmxptr); |
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372 | else |
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373 | mexErrMsgTxt("Required field 'Length' was not found in the element data structure"); |
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374 | |
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375 | |
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376 | /* Optionnal arguments */ |
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377 | /* Kicks from multipole elements can be specified as angles. This handles the |
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378 | case where corrector coils are used in sextupoles and used for orbit |
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379 | correction. */ |
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380 | tmpmxptr = mxGetField(prhs[0],0,"KickAngle"); |
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381 | if(tmpmxptr) |
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382 | ka = mxGetPr(tmpmxptr); |
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383 | else |
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384 | ka = NULL; |
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385 | |
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386 | tmpmxptr = mxGetField(prhs[0],0,"R1"); |
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387 | if(tmpmxptr) |
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388 | pr1 = mxGetPr(tmpmxptr); |
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389 | else |
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390 | pr1=NULL; |
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391 | |
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392 | tmpmxptr = mxGetField(prhs[0],0,"R2"); |
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393 | if(tmpmxptr) |
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394 | pr2 = mxGetPr(tmpmxptr); |
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395 | else |
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396 | pr2=NULL; |
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397 | |
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398 | tmpmxptr = mxGetField(prhs[0],0,"T1"); |
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399 | if(tmpmxptr) |
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400 | pt1=mxGetPr(tmpmxptr); |
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401 | else |
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402 | pt1=NULL; |
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403 | |
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404 | tmpmxptr = mxGetField(prhs[0],0,"T2"); |
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405 | if(tmpmxptr) |
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406 | pt2=mxGetPr(tmpmxptr); |
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407 | else |
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408 | pt2=NULL; |
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409 | |
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410 | |
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411 | if(ka!=NULL) |
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412 | { |
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413 | /* Positive angle must correspond to -ve B field since +ve B field corresponds |
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414 | to a bend with the same curvature as the bend magnets. |
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415 | */ |
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416 | B[0] -= sin(ka[0])/le; |
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417 | A[0] += sin(ka[1])/le; |
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418 | } |
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419 | |
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420 | |
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421 | plhs[0] = mxDuplicateArray(prhs[1]); |
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422 | r_in = mxGetPr(plhs[0]); |
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423 | StrMPoleSymplectic4Pass(r_in, le, A, B, max_order, num_int_steps,pt1, pt2, pr1, pr2, n); |
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424 | |
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425 | if(ka!=NULL) |
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426 | { |
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427 | B[0] += sin(ka[0])/le; |
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428 | A[0] -= sin(ka[1])/le; |
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429 | } |
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430 | |
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431 | |
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432 | } |
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433 | else |
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434 | { /* return list of required fields */ |
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435 | plhs[0] = mxCreateCellMatrix(5,1); |
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436 | mxSetCell(plhs[0],0,mxCreateString("Length")); |
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437 | mxSetCell(plhs[0],1,mxCreateString("PolynomA")); |
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438 | mxSetCell(plhs[0],2,mxCreateString("PolynomB")); |
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439 | mxSetCell(plhs[0],3,mxCreateString("MaxOrder")); |
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440 | mxSetCell(plhs[0],4,mxCreateString("NumIntSteps")); |
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441 | |
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442 | if(nlhs>1) /* Required and optional fields */ |
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443 | { plhs[1] = mxCreateCellMatrix(4,1); |
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444 | mxSetCell(plhs[1],0,mxCreateString("T1")); |
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445 | mxSetCell(plhs[1],1,mxCreateString("T2")); |
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446 | mxSetCell(plhs[1],2,mxCreateString("R1")); |
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447 | mxSetCell(plhs[1],3,mxCreateString("R2")); |
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448 | mxSetCell(plhs[1],4,mxCreateString("KickAngle")); |
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449 | } |
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450 | } |
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451 | } |
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452 | |
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453 | |
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454 | |
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