1 | function [Chro, Tune] = modelchro(varargin) |
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2 | %MODELCHRO - Returns the AT model chromaticity |
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3 | % [Chromaticity, Tune] = modelchro(DeltaRF) |
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4 | % |
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5 | % INPUTS |
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6 | % 1. DeltaRF - Change in RF used to compute the chromaticity [Hz] {Default: .1 Hz} |
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7 | % 2. 'Hardware' returns chromaticity in hardware units (Tune/MHz (usually)) |
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8 | % 'Physics' returns chromaticity in physics units (Tune/(dp/p)) |
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9 | % |
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10 | % OUTPUTS |
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11 | % 1. Chromaticity vector (2x1) |
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12 | % 1. Tune vector (2x1) |
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13 | % |
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14 | % Also see, modelbeta, modeltune, modeldisp, modeltwiss |
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15 | |
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16 | % |
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17 | % Written by Greg Portmann |
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18 | |
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19 | |
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20 | %UnitsFlag = getunits('TUNE'); |
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21 | UnitsFlag = 'Physics'; |
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22 | if isempty(UnitsFlag) |
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23 | UnitsFlag = 'Physics'; |
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24 | end |
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25 | |
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26 | MCF = []; |
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27 | |
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28 | % Look if 'struct' or 'numeric' in on the input line |
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29 | for i = length(varargin):-1:1 |
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30 | if strcmpi(varargin{i},'Physics') |
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31 | UnitsFlag = 'Physics'; |
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32 | varargin(i) = []; |
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33 | %if length(varargin) >= i |
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34 | % if isnumeric(varargin{i}) |
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35 | % MCF = varargin{i}; |
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36 | % varargin(i) = []; |
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37 | % end |
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38 | %end |
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39 | elseif strcmpi(varargin{i},'Hardware') |
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40 | UnitsFlag = 'Hardware'; |
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41 | varargin(i) = []; |
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42 | %if length(varargin) >= i |
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43 | % if isnumeric(varargin{i}) |
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44 | % MCF = varargin{i}; |
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45 | % varargin(i) = []; |
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46 | % end |
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47 | %end |
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48 | end |
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49 | end |
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50 | |
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51 | |
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52 | DeltaRF = []; |
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53 | if length(varargin) >= 1 |
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54 | if isnumeric(varargin{1}) |
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55 | DeltaRF = varargin{1}; % Hz |
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56 | end |
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57 | end |
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58 | if isempty(DeltaRF) |
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59 | DeltaRF = .1; % Hz |
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60 | end |
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61 | |
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62 | |
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63 | global THERING |
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64 | if isempty(THERING) |
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65 | error('Simulator variable is not setup properly.'); |
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66 | end |
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67 | |
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68 | |
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69 | % tunechrom does not take into account the present RF frequency |
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70 | % [Tune, Chro] = tunechrom(THERING, 0, 'chrom'); |
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71 | % Tune = Tune(:); |
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72 | % Chro = Chro(:); |
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73 | |
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74 | |
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75 | [CavityState, PassMethod, iCavity] = getcavity; |
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76 | if isempty(CavityState) |
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77 | error('The model does not have a cavity, hence the chromaticity cannot be determined.'); |
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78 | else |
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79 | if any(strcmpi(CavityState(1,:),'Off')) |
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80 | % Turn on the cavities |
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81 | setcavity('On'); |
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82 | end |
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83 | end |
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84 | |
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85 | |
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86 | % If the integer tune in needed |
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87 | %[TD, Tune] = twissring(THERING,0,1:length(THERING)+1); |
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88 | %IntTune = fix(Tune(:)); |
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89 | |
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90 | |
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91 | % Get tune (Johan's method) |
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92 | M66 = findm66(THERING); |
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93 | FracTune0 = getnusympmat(M66); |
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94 | %Tune = fix(IntTune) + FracTune0; |
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95 | |
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96 | |
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97 | % Small change in the RF and remeasure the tune |
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98 | RF0 = THERING{iCavity(1)}.Frequency; |
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99 | for i = 1:length(iCavity) |
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100 | THERING{iCavity(i)}.Frequency = RF0 + DeltaRF; |
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101 | end |
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102 | |
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103 | % Get tune (Johan's method) |
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104 | M66 = findm66(THERING); |
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105 | FracTune1 = getnusympmat(M66); |
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106 | |
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107 | |
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108 | % Reset the RF |
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109 | for i = 1:length(iCavity) |
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110 | THERING{iCavity(i)}.Frequency = RF0; |
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111 | end |
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112 | |
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113 | |
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114 | % Chromaticity in hardware units (DeltaTune / DeltaRF) |
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115 | DeltaRF = physics2hw('RF', 'Setpoint', DeltaRF, [1 1], 'Model'); |
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116 | Chro = (FracTune1 - FracTune0) / DeltaRF; |
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117 | |
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118 | |
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119 | if strcmpi(UnitsFlag,'Physics') |
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120 | % Change to Physics units |
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121 | MCF = mcf(THERING); |
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122 | RF0 = physics2hw('RF', 'Setpoint', RF0, [1 1], 'Model'); |
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123 | Chro = (-MCF * RF0) * Chro; |
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124 | end |
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125 | |
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126 | |
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127 | % if strcmpi(UnitsFlag,'Hardware') |
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128 | % % Change to Hardware units |
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129 | % MCF = mcf(THERING); |
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130 | % CavityFrequency = THERING{iCavity(1)}.Frequency; |
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131 | % Chro = Chro / (-MCF * RF0); |
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132 | % end |
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133 | |
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134 | |
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135 | |
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136 | % Reset cavity PassMethod |
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137 | setcavity(PassMethod); |
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138 | |
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139 | |
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140 | |
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