[1337] | 1 | #$Id: emcalculator.py,v 1.1 2008/12/01 07:04:08 kmura Exp $ |
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| 2 | """ |
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| 3 | # ================================================================== |
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| 4 | # Python module |
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| 5 | # |
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| 6 | # Calculation of photon cross section and stopping power for |
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| 7 | # chared particles |
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| 8 | # |
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| 9 | # Q, 2005 |
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| 10 | # ================================================================== |
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| 11 | """ |
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| 12 | from Geant4 import * |
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| 13 | |
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| 14 | # ================================================================== |
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| 15 | # public symbols |
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| 16 | # ================================================================== |
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| 17 | __all__ = [ 'CalculatePhotonCrossSection', 'CalculateDEDX' ] |
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| 18 | |
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| 19 | # ================================================================== |
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| 20 | # Photon Cross Section |
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| 21 | # ================================================================== |
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| 22 | def CalculatePhotonCrossSection(mat, elist, verbose=0, |
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| 23 | plist=["compt", "", "phot", "conv"]): |
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| 24 | """ |
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| 25 | Calculate photon cross section for a given material and |
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| 26 | a list of energy, returing a list of cross sections for |
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| 27 | the components of "Copmton scattering", "rayleigh scattering", |
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| 28 | "photoelectric effect", "pair creation" and total one. |
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| 29 | |
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| 30 | Arguments: |
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| 31 | mat: material name |
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| 32 | elist: list of energy |
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| 33 | verbose: verbose level [0] |
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| 34 | plist: list of process name |
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| 35 | (compton/rayleigh/photoelectic/conversion) [StandardEM set] |
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| 36 | |
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| 37 | Keys of index: |
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| 38 | "compt": Compton Scattering |
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| 39 | "rayleigh": Rayleigh Scattering |
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| 40 | "phot" : photoelectric effect |
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| 41 | "conv" : pair Creation |
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| 42 | "tot" : total |
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| 43 | |
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| 44 | Example: |
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| 45 | xsec_list= CalculatePhotonCrossSection(...) |
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| 46 | value= xsec_list[energy_index]["compt"] |
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| 47 | """ |
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| 48 | if(verbose>0): |
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| 49 | print "-------------------------------------------------------------------" |
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| 50 | print " Photon Cross Section (", mat, ")" |
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| 51 | print "Energy Compton Raleigh Photo- Pair Total" |
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| 52 | print " Scattering Scattering electric Creation" |
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| 53 | print "(MeV) (cm2/g) (cm2/g) (cm2/g) (cm2/g) (cm2/g)" |
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| 54 | print "-------------------------------------------------------------------" |
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| 55 | |
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| 56 | xsection_list= [] |
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| 57 | for ekin in elist: |
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| 58 | xsec= {} |
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| 59 | xsec["compt"] \ |
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| 60 | = gEmCalculator.ComputeCrossSectionPerVolume(ekin, "gamma", plist[0], |
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| 61 | mat) * cm2/g |
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| 62 | xsec["rayleigh"] \ |
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| 63 | = gEmCalculator.ComputeCrossSectionPerVolume(ekin, "gamma", plist[1], |
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| 64 | mat) * cm2/g |
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| 65 | |
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| 66 | xsec["phot"] \ |
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| 67 | = gEmCalculator.ComputeCrossSectionPerVolume(ekin, "gamma", plist[2], |
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| 68 | mat) * cm2/g |
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| 69 | xsec["conv"] \ |
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| 70 | = gEmCalculator.ComputeCrossSectionPerVolume(ekin, "gamma", plist[3], |
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| 71 | mat) * cm2/g |
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| 72 | |
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| 73 | xsec["tot"]= xsec["compt"] + xsec["rayleigh"] + xsec["phot"] + xsec["conv"] |
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| 74 | |
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| 75 | xsection_list.append((ekin, xsec)) |
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| 76 | |
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| 77 | if(verbose>0): |
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| 78 | print " %8.3e %8.3e %8.3e %8.3e %8.3e %8.3e" \ |
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| 79 | % (ekin/MeV, xsec["compt"]/(cm2/g), xsec["rayleigh"]/(cm2/g), |
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| 80 | xsec["phot"]/(cm2/g), xsec["conv"]/(cm2/g), xsec["tot"]/(cm2/g)) |
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| 81 | |
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| 82 | return xsection_list |
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| 83 | |
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| 84 | |
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| 85 | # ================================================================== |
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| 86 | # Stopping Power |
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| 87 | # ================================================================== |
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| 88 | def CalculateDEDX(part, mat, elist, verbose=0, |
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| 89 | plist=["eIoni", "eBrem", "muIoni", "muBrems", "hIoni"]): |
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| 90 | """ |
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| 91 | Calculate stopping powers for a give particle, material and |
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| 92 | a list of energy, returing stopping power for the components of |
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| 93 | "Ionization", "Radiation" and total one. |
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| 94 | |
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| 95 | Arguments: |
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| 96 | part: particle name |
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| 97 | mat: material name |
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| 98 | elist: list of energy |
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| 99 | verbose: verbose level [0] |
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| 100 | plist: list of process name |
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| 101 | (electron ionization/electron brems/ |
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| 102 | muon ionization/muon brems/hadron ionization) [StandardEM set] |
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| 103 | |
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| 104 | Keys of index: |
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| 105 | "ioni": ionization |
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| 106 | "brems": Bremsstrahlung |
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| 107 | "tot": total |
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| 108 | |
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| 109 | Example: |
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| 110 | dedx_list= CalculateDEDX(...) |
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| 111 | value= dedx_list[energy_index]["ioni"] |
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| 112 | """ |
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| 113 | if(verbose>0): |
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| 114 | print "------------------------------------------------------" |
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| 115 | print " Stopping Power (", part, ",", mat, ")" |
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| 116 | print " Energy Ionization Radiation Total" |
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| 117 | print " (MeV) (MeVcm2/g) (MeVcm2/g) (MeVcm2/g)" |
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| 118 | print "------------------------------------------------------" |
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| 119 | |
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| 120 | procname_brems= "" |
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| 121 | procname_ioni= "" |
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| 122 | if ( part=="e+" or part=="e-" ): |
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| 123 | procname_ioni= plist[0] |
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| 124 | procname_brems= plist[1] |
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| 125 | elif ( part=="mu+" or part=="mu-"): |
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| 126 | procname_ioni= plist[2] |
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| 127 | procname_brems= plist[3] |
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| 128 | else: |
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| 129 | procname_ioni= plist[4] |
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| 130 | procname_brems= "" |
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| 131 | |
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| 132 | dedx_list= [] |
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| 133 | for ekin in elist: |
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| 134 | dedx= {} |
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| 135 | dedx["ioni"] \ |
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| 136 | = gEmCalculator.ComputeDEDX(ekin, part, procname_ioni, mat) * MeV*cm2/g |
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| 137 | dedx["brems"] \ |
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| 138 | = gEmCalculator.ComputeDEDX(ekin, part, procname_brems, mat) * MeV*cm2/g |
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| 139 | dedx["tot"]= dedx["ioni"]+ dedx["brems"] |
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| 140 | |
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| 141 | if(verbose>0): |
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| 142 | print " %8.3e %8.3e %8.3e %8.3e" \ |
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| 143 | % (ekin/MeV, dedx["ioni"]/(MeV*cm2/g), |
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| 144 | dedx["brems"]/(MeV*cm2/g), dedx["tot"]/(MeV*cm2/g) ) |
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| 145 | |
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| 146 | |
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| 147 | dedx_list.append((ekin, dedx)) |
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| 148 | |
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| 149 | return dedx_list |
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| 150 | |
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