1 | /* ------------------------------------------------------------------------- |
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2 | * trace_optics.c |
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3 | * |
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4 | * --- main program for raytracing |
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5 | * |
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6 | * Copyright (c) 2000-2010 N.Sakaki, Y.Takizawa, Y.Kawasaki |
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7 | * All rights reserved. |
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8 | * $Id$ |
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9 | * ------------------------------------------------------------------------- |
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10 | */ |
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11 | #define NTRACE |
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12 | |
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13 | #include <stdio.h> |
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14 | #include <stdlib.h> |
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15 | #include <ctype.h> |
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16 | #include <time.h> |
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17 | #include <math.h> |
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18 | #include <string.h> |
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19 | #include "EConst.hh" |
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20 | #include "Nrand_gen.hh" |
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21 | #include "Ntrace_lenses.hh" |
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22 | #include "Ntrace_optics.hh" |
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23 | #include "Nphoton.hh" |
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24 | |
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25 | //#define DEBUG |
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26 | |
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27 | using namespace NTraceLens; |
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28 | |
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29 | |
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30 | /* ------------------------------------------------------------------------- |
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31 | * int trace_main(tel_param *param, NPhoton *photon, FILE *fp) |
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32 | * |
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33 | * --- trace photons in the EUSO optics (Entrance to FS) |
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34 | * |
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35 | * [input value] |
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36 | * param : tel_param* to store the optics parameters |
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37 | * (see also in tracemain_optF1v2.h) |
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38 | * photon : info of photon (position, vector, time, wavelength,...) |
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39 | * fp : FILE* for (error) message logging |
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40 | * |
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41 | * [return value] |
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42 | * 0: normal end |
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43 | * <0: error (see trace_optF1v2.h for more detail) |
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44 | * ------------------------------------------------------------------------- |
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45 | */ |
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46 | int NTraceLens::trace_main(tel_param *param, NPhoton *photon, FILE *fplog) |
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47 | { |
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48 | static double *z0; |
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49 | static int N_FOCAL_SURFACE; |
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50 | static int fs_init=0; |
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51 | int j; |
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52 | int flg, fsloop; |
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53 | double r,r2,dist,xx,yy,zz; |
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54 | |
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55 | if(!fs_init) |
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56 | { |
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57 | fs_init=1; |
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58 | N_FOCAL_SURFACE=(int)(param->r_fs/FS_DEF_STEP); |
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59 | z0=(double *)malloc(sizeof(double)*N_FOCAL_SURFACE); |
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60 | if(!z0) |
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61 | { |
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62 | fprintf(fplog,"Cannot allocate memory for array for focalsurface\n"); |
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63 | exit(-10); |
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64 | } |
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65 | for(j=0;j<N_FOCAL_SURFACE;j++) |
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66 | { |
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67 | r=(double)j*FS_DEF_STEP; |
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68 | z0[j]=FocalSurface(r,param); |
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69 | } |
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70 | } |
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71 | |
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72 | /* the contents of photon will be overwritten in trace_lens() */ |
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73 | flg=trace_lens(param,photon,fplog); |
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74 | if(flg!=0) |
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75 | { |
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76 | #ifdef DEBUG |
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77 | if(fplog) |
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78 | fprintf(fplog,"flg=%d in trace_main\n",flg); |
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79 | #endif |
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80 | return flg; |
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81 | } |
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82 | else if(photon->px[Z]<=0.0) |
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83 | { |
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84 | return (RT_ESCAPE_FROM_ENTRANCE+SURFACE1); |
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85 | } |
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86 | else /* photon->px[Z]>0.0 */ |
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87 | { |
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88 | j=0; |
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89 | zz=z0[j]; |
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90 | r=1.0e30; |
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91 | fsloop=0; |
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92 | do { |
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93 | fsloop++; |
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94 | r2=r; |
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95 | |
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96 | dist=(zz-photon->x[Z])/photon->px[Z]; |
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97 | xx=photon->px[X]*dist+photon->x[X]; |
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98 | yy=photon->px[Y]*dist+photon->x[Y]; |
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99 | r=sqrt(xx*xx+yy*yy); /* distance to optical axis */ |
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100 | |
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101 | j=int(r/FS_DEF_STEP); |
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102 | if(j>=N_FOCAL_SURFACE || j < 0) /*changed by francesco 15-01-2010*/ |
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103 | j=N_FOCAL_SURFACE-1; /* should be error? */ |
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104 | |
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105 | if(fabs(z0[j]-zz)<FS_DEF_STEP) |
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106 | { |
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107 | if(r > param->r_fs) |
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108 | flg=1; /* out of focal surface */ |
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109 | else/*changed by francesco 15-01-2010*/ |
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110 | zz=FocalSurface(r,param); |
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111 | } |
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112 | else |
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113 | zz=z0[j]; |
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114 | }while(fabs(r-r2)>FS_TOLERANCE && !flg && fsloop<FSLOOP_MAX); |
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115 | |
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116 | if(flg) |
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117 | { |
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118 | #ifdef DEBUG |
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119 | fprintf(stderr,"curpos(%.1f,%.1f,%.1f) vec(%.2f,%.2f,%.2f) " |
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120 | "est pos on FS(%.1f,%.1f,%.1f) r=%.1f\n", |
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121 | photon->x[X],photon->x[Y],photon->x[Z], |
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122 | photon->px[X],photon->px[Y],photon->px[Z], |
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123 | xx,yy,zz,r |
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124 | ); |
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125 | |
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126 | #endif |
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127 | return (SURFACE_FS+RT_OUT_OF_SURFACE1); |
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128 | } |
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129 | else if(fsloop>=FSLOOP_MAX) |
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130 | { |
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131 | return (SURFACE_FS+RT_STRAY_LIGHT); |
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132 | } |
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133 | else |
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134 | { |
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135 | photon->x[X]=xx; |
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136 | photon->x[Y]=yy; |
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137 | photon->x[Z]=zz; |
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138 | photon->t+=dist*param->material[param->surface[3].matid].n[0]/EConst::Clight(); |
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139 | |
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140 | //DN StorePhotonHistory(photon); |
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141 | if(CheckRcut(param,photon,SURFACE_FS)) |
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142 | return (SURFACE_FS+RT_OUT_OF_SURFACE1); |
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143 | } |
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144 | } |
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145 | |
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146 | |
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147 | return 0; |
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148 | } |
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149 | |
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150 | /* ------------------------------------------------------------------------- |
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151 | * int read_tel_param(char *filename, tel_param *param, FILE *fplog) |
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152 | * |
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153 | * --- read optics parameters from a file |
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154 | * |
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155 | * [input value] |
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156 | * filename: the name of the file for optics parameters |
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157 | * param : pointer to tel_param structure (see also tracemain_optF1v2.h) |
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158 | * fplog : FILE* for (error) message logging |
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159 | * |
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160 | * [return value] |
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161 | * -1 : "(char *)filename" not found |
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162 | * 0 : normal end |
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163 | * ------------------------------------------------------------------------- |
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164 | */ |
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165 | int NTraceLens::read_tel_param(char *filename, tel_param *param, FILE *fplog) |
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166 | { |
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167 | FILE *fr; |
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168 | char buf[256],item[256],tname[256],tfile[256]; |
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169 | double val; |
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170 | int i, ival; |
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171 | |
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172 | /* initialize tel_param structure */ |
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173 | param->flag_printray=0; |
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174 | |
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175 | param->nmat=2; |
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176 | param->material[0].name=strdup("VACUUM"); |
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177 | param->material[0].ndata=1; |
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178 | param->material[0].n=(double *)malloc(sizeof(double)); |
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179 | param->material[0].k=(double *)malloc(sizeof(double)); |
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180 | param->material[0].n[0]=1.0; |
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181 | param->material[0].k[0]=0.0; |
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182 | |
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183 | param->material[1].name=strdup("AIR"); |
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184 | param->material[1].ndata=1; |
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185 | param->material[1].n=(double *)malloc(sizeof(double)); |
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186 | param->material[1].k=(double *)malloc(sizeof(double)); |
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187 | param->material[1].n[0]=1.0003; |
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188 | param->material[1].k[0]=0.0; |
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189 | |
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190 | param->DOE_order=1; |
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191 | param->DOE_efficiency=0.95; |
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192 | for(i=0;i<NSURFACES;i++){ |
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193 | param->surface[i].r_cutx=param->surface[i].r_cut=1.e10; |
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194 | } |
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195 | param->r_cut_fs=param->r_cutx_fs=1.e10; |
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196 | |
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197 | |
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198 | if(( fr=fopen(filename,"r") )==NULL) |
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199 | { |
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200 | if(fplog) |
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201 | fprintf(fplog,"Telescope parameter file %s cannot be opened.\n",filename); |
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202 | return -1; |
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203 | } |
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204 | while(fgets(buf,255,fr)) |
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205 | { |
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206 | if(buf[0]!=0 || buf[0]!='#') |
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207 | { |
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208 | sscanf(buf,"%255s",item); |
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209 | switch(item[0]) |
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210 | { |
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211 | case 'D': |
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212 | sscanf(buf,"%s",tname); |
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213 | if(strcmp(tname,"DOEord")==0){ |
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214 | sscanf(buf,"%*s %d",&ival); |
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215 | param->DOE_order=ival; |
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216 | }else if(strcmp(tname,"DOEeff")==0){ |
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217 | sscanf(buf,"%*s %lf",&val); |
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218 | if(val>=0. && val<=1.0) |
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219 | param->DOE_efficiency=val; |
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220 | } |
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221 | break; |
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222 | case 'F': |
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223 | sscanf(buf,"%*s %lf",&val); |
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224 | switch(item[2]) |
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225 | { |
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226 | case '_': |
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227 | if(item[3]=='C') |
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228 | param->FS_C=val; |
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229 | else if(item[3]=='K') |
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230 | param->FS_K=val; |
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231 | else if(item[3]=='O') |
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232 | param->FS_OFFSET=val; |
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233 | break; |
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234 | |
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235 | case 'A': |
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236 | case 'B': |
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237 | case 'C': |
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238 | case 'D': |
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239 | param->FS[item[2]-'A']=val; |
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240 | break; |
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241 | } |
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242 | break; |
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243 | |
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244 | case 'l': |
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245 | switch(item[1]) |
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246 | { |
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247 | case 'e': |
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248 | sscanf(buf,"%*s %255s",param->lens_dir); |
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249 | break; |
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250 | case 'a': |
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251 | sscanf(buf,"%*s %lf",¶m->lambda0); |
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252 | break; |
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253 | } |
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254 | break; |
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255 | |
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256 | case 'M': |
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257 | if(isdigit(item[1]) && item[1]>='0' && item[1]<'0'+NSURFACES) |
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258 | { |
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259 | sscanf(buf,"%*s %256s",tname); |
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260 | for(i=0; i<param->nmat; i++) |
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261 | if(!strcmp(tname,param->material[i].name)) |
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262 | { |
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263 | param->surface[item[1]-'0'].matid=i; |
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264 | break; |
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265 | } |
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266 | if(i==param->nmat){ |
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267 | fprintf(stderr,"%s: Material \"%s\" is NOT registered!\n", |
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268 | item,tname); |
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269 | exit(-20); |
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270 | } |
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271 | } |
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272 | else if(item[1]=='a') |
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273 | { |
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274 | sscanf(buf,"%*s %256s %256s",tname,tfile); |
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275 | for(i=0;i<param->nmat;i++) |
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276 | if(!strcmp(tname,param->material[i].name)) |
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277 | { |
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278 | fprintf(stderr,"%s is already registered!\n",tname); |
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279 | break; |
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280 | } |
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281 | if(i==param->nmat) |
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282 | { |
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283 | param->material[param->nmat].name=strdup(tname); |
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284 | param->material[param->nmat].filename=strdup(tfile); |
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285 | param->material[param->nmat].zn=NULL; |
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286 | param->material[param->nmat].zk=NULL; |
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287 | param->nmat++; |
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288 | } |
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289 | } |
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290 | break; |
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291 | |
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292 | case 'N': |
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293 | sscanf(buf,"%*s %255s",tname); |
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294 | param->name=strdup(tname); |
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295 | break; |
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296 | |
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297 | case 'P': |
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298 | if(!strcmp(item,"PrintRay")) |
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299 | param->flag_printray=1; |
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300 | break; |
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301 | |
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302 | case 'R': |
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303 | sscanf(buf,"%*s %lf",&val); |
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304 | switch(item[1]) |
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305 | { |
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306 | case '_': |
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307 | switch(item[2]) |
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308 | { |
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309 | case 'L': |
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310 | if(strncmp(item,"R_LENS",6)==0) |
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311 | { |
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312 | if(item[6]&& item[6]>='1' && item[6]<='7') |
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313 | param->surface[item[6]-'0'].r_lens=val; |
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314 | for(i=0;i<NSURFACES+1;i++) |
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315 | param->surface[i].r_lens=val; |
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316 | } |
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317 | break; |
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318 | case 'W': |
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319 | param->r_wall=val; |
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320 | break; |
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321 | case 'F': |
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322 | param->r_fs=val; |
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323 | break; |
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324 | case 'c': |
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325 | case 'y': |
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326 | if(item[5]-'0'<NSURFACES) |
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327 | param->surface[item[5]-'0'].r_cut=val; |
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328 | else if(item[5]=='8') /* FS */ |
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329 | param->r_cut_fs=val; |
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330 | break; |
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331 | case 'x': |
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332 | if(item[5]-'0'<NSURFACES) |
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333 | param->surface[item[5]-'0'].r_cutx=val; |
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334 | else if(item[5]=='8') /* FS */ |
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335 | param->r_cutx_fs=val; |
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336 | break; |
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337 | } |
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338 | break; |
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339 | |
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340 | case 'c': |
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341 | if(isdigit(item[2]) && item[2]>'0' && item[2] < '0'+NSURFACES) |
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342 | param->surface[item[2]-'0'].Rc=val; |
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343 | else if(item[2]=='D') /* for DOE */ |
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344 | param->surface[SURFDOE].Rc=val; |
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345 | break; |
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346 | |
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347 | case 's': |
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348 | if(isdigit(item[2]) && item[2]>'0' && item[2] < '0'+NSURFACES) |
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349 | param->surface[item[2]-'0'].r_lens=val; |
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350 | else if(item[2]=='D') |
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351 | { |
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352 | param->surface[SURFDOE].r_lens=val; |
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353 | sscanf(buf,"%*s %*f %256s",tfile); |
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354 | param->surface[SURFDOE].filename=strdup(tfile); |
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355 | } |
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356 | break; |
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357 | } |
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358 | |
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359 | case 'S': |
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360 | sscanf(buf,"%*s %lf",&val); |
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361 | if(item[1]=='z') |
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362 | { |
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363 | if(isdigit(item[2]) && item[2]<'0'+NSURFACES) |
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364 | param->surface[item[2]-'0'].Sz=val; |
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365 | else if(item[2]=='D') |
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366 | param->surface[SURFDOE].Sz=val; |
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367 | if(item[2]>'0' && item[2]<'0'+NSURFACES) |
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368 | { |
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369 | sscanf(buf,"%*s %*f %s",tfile); |
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370 | param->surface[item[2]-'0'].filename=strdup(tfile); |
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371 | } |
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372 | } |
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373 | break; |
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374 | |
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375 | default: |
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376 | ; /* skip */ |
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377 | } |
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378 | } |
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379 | } |
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380 | fclose(fr); |
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381 | |
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382 | for(i=1;i<=7;i++) |
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383 | param->surface[i].Sz += param->surface[0].Sz; |
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384 | |
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385 | for(i=1;i<8;i++) |
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386 | { |
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387 | param->surface[i].Zc = param->surface[i].Rc+param->surface[i].Sz; |
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388 | } |
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389 | |
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390 | param->FS_OFFSET += param->surface[0].Sz; |
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391 | |
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392 | param->surface[0].r_cut=3000.0; |
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393 | param->surface[0].r_cutx=3000.0; |
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394 | param->surface[5].r_cut=param->surface[4].r_cut; |
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395 | param->surface[2].r_cut=param->surface[1].r_cut; |
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396 | param->surface[7].r_cut=param->surface[6].r_cut; |
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397 | param->surface[5].r_cutx=param->surface[4].r_cutx; |
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398 | param->surface[2].r_cutx=param->surface[1].r_cutx; |
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399 | param->surface[7].r_cutx=param->surface[6].r_cutx; |
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400 | |
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401 | param->surface[2].r_lens=param->surface[1].r_lens; |
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402 | param->surface[5].r_lens=param->surface[4].r_lens; |
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403 | param->surface[7].r_lens=param->surface[6].r_lens; |
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404 | |
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405 | return 0; |
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406 | } |
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407 | |
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408 | /* ------------------------------------------------------------------------- |
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409 | * int print_param(tel_param *p) |
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410 | * |
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411 | * --- print optics parameters for debbuging purpose |
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412 | * |
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413 | * [input value] |
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414 | * p: pointer to tel_param structure |
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415 | * |
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416 | * [return value] |
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417 | * always 0 |
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418 | * |
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419 | * ------------------------------------------------------------------------- |
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420 | */ |
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421 | int NTraceLens::print_param(tel_param *p) |
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422 | { |
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423 | int i; |
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424 | |
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425 | printf("*** JEM-EUSO Optics <%s> ***\n",p->name); |
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426 | for(i=1;i<=7;i++) |
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427 | printf("r_lens(%d)=%.3f\n",i,p->surface[i].r_lens); |
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428 | printf("r_lens(DOE)=%.3f\n\n",p->surface[SURFDOE].r_lens); |
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429 | |
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430 | printf("r_wall=%.3f ",p->r_wall); |
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431 | printf("r_fs=%.3f\n",p->r_fs); |
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432 | for(i=1;i<=7;i++) |
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433 | { |
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434 | printf("Rc%d=%.5f \t",i,p->surface[i].Rc); |
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435 | printf("Sz%d=%.5f \t",i,p->surface[i].Sz); |
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436 | printf("Zc%d=%.5f\n",i,p->surface[i].Zc); |
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437 | } |
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438 | printf("dir=%s\n",p->lens_dir); |
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439 | |
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440 | printf("FS_C=%g ",p->FS_C); |
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441 | printf("FS_K=%.2f\n",p->FS_K); |
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442 | for(i=0;i<4;i++) |
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443 | printf("FS%c=%g ",i+'A',p->FS[i]); |
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444 | |
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445 | printf("FS_offset=%.2f\n",p->FS_OFFSET); |
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446 | for(i=1;i<NSURFACES;i++) |
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447 | printf("Rcut%d(x)=%.2e Rcut%d(y)=%.2e Rlens=%.2f\n", |
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448 | i,p->surface[i].r_cutx, |
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449 | i,p->surface[i].r_cut, |
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450 | p->surface[i].r_lens); |
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451 | |
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452 | printf("\nDOE order=%d\n",p->DOE_order); |
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453 | printf("DOE efficiency=%.3f\n",p->DOE_efficiency); |
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454 | |
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455 | printf("\n\n"); |
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456 | for(i=1;i<7;i++) |
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457 | printf("material(S%d):%s\n",i,p->material[p->surface[i].matid].name); |
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458 | |
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459 | return 0; |
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460 | } |
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461 | |
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462 | /* ------------------------------------------------------------------------- |
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463 | * double FocalSurface(double r, tel_param *p) |
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464 | * |
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465 | * --- calculate the Focal surface height as a function of the radius |
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466 | * from the center |
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467 | * As photons move toward z>0, FS_C should always be negative. |
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468 | * |
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469 | * [input value] |
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470 | * r: radius in mm |
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471 | * p: pointer to tel_param structure (optics parameter) |
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472 | * |
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473 | * [return value] |
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474 | * relative height of FS to that at r=0 in mm |
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475 | * |
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476 | * ------------------------------------------------------------------------- |
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477 | */ |
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478 | /* photons move to the direction z>0 */ |
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479 | double NTraceLens::FocalSurface(double r /* mm */, tel_param *p) /* mm */ |
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480 | { |
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481 | double r2; |
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482 | |
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483 | r2=r*r; |
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484 | return r2*(p->FS_C /(1.0+sqrt(1.0-(1.0 + p->FS_K)* p->FS_C * p->FS_C *r2)) |
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485 | +r2*(p->FS[0] +r2*(p->FS[1]+r2*(p->FS[2] + r2* p->FS[3]))))+ p->FS_OFFSET; |
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486 | } |
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