| Geant4 Cross Reference |
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25 //
26
27 #include "G4RegularXTRadiator.hh"
28
29 #include "G4Gamma.hh"
30 #include "G4PhysicalConstants.hh"
31
32 //////////////////////////////////////////////
33 // Constructor, destructor
34 G4RegularXTRadiator::G4RegularXTRadiator(G4Log
35 G4Mat
36 G4Mat
37 G4dou
38 const
39 : G4VXTRenergyLoss(anEnvelope, foilMat, gasM
40 {
41 G4cout << "Regular X-ray TR radiator EM proc
42
43 // Build energy and angular integral spectra
44 // a radiator
45
46 fAlphaPlate = 10000;
47 fAlphaGas = 1000;
48 G4cout << "fAlphaPlate = " << fAlphaPlate <<
49 << G4endl;
50 }
51
52 //////////////////////////////////////////////
53 G4RegularXTRadiator::~G4RegularXTRadiator() =
54
55 void G4RegularXTRadiator::ProcessDescription(s
56 {
57 out << "Simulation of X-ray transition radia
58 "relativistic charged particles cross
59 "two materials. Thicknesses of plates
60 }
61
62 //////////////////////////////////////////////
63 G4double G4RegularXTRadiator::SpectralXTRdEdx(
64 {
65 G4double result, sum = 0., tmp, cof1, cof2,
66 G4double aMa, bMb, sigma, dump;
67 G4int k, kMax, kMin;
68
69 aMa = fPlateThick * GetPlateLinearPhotoAbs
70 bMb = fGasThick * GetGasLinearPhotoAbs(ene
71 sigma = 0.5 * (aMa + bMb);
72 dump = std::exp(-fPlateNumber * sigma);
73 if(verboseLevel > 2)
74 G4cout << " dump = " << dump << G4endl;
75 cofPHC = 4 * pi * hbarc;
76 tmp = (fSigma1 - fSigma2) / cofPHC / ener
77 cof1 = fPlateThick * tmp;
78 cof2 = fGasThick * tmp;
79
80 cofMin = energy * (fPlateThick + fGasThick)
81 cofMin += (fPlateThick * fSigma1 + fGasThick
82 cofMin /= cofPHC;
83
84 theta2 = cofPHC / (energy * (fPlateThick + f
85
86 kMin = G4int(cofMin);
87 if(cofMin > kMin)
88 kMin++;
89
90 kMax = kMin + 49;
91
92 if(verboseLevel > 2)
93 {
94 G4cout << cof1 << " " << cof2 << "
95 G4cout << "kMin = " << kMin << "; kMax
96 }
97 for(k = kMin; k <= kMax; ++k)
98 {
99 tmp = pi * fPlateThick * (k + cof2) / (
100 result = (k - cof1) * (k - cof1) * (k + co
101 if(k == kMin && kMin == G4int(cofMin))
102 {
103 sum +=
104 0.5 * std::sin(tmp) * std::sin(tmp) *
105 }
106 else
107 {
108 sum += std::sin(tmp) * std::sin(tmp) * s
109 }
110 theta2k = std::sqrt(theta2 * std::abs(k -
111
112 if(verboseLevel > 2)
113 {
114 G4cout << k << " " << theta2k << "
115 << std::sin(tmp) * std::sin(tmp)
116 << " " << sum << G4endl;
117 }
118 }
119 result = 2 * (cof1 + cof2) * (cof1 + cof2) *
120 result *= (1 - dump + 2 * dump * fPlateNumbe
121
122 return result;
123 }
124
125 //////////////////////////////////////////////
126 // Approximation for radiator interference fac
127 // fully Regular radiator. The plate and gas g
128 // The mean values of the plate and gas gap th
129 // are supposed to be about XTR formation zone
130 // mean absorption length of XTR photons in co
131
132 G4double G4RegularXTRadiator::GetStackFactor(G
133 G
134 {
135 // some gamma (10000/1000) like algorithm
136
137 G4double result, Za, Zb, Ma, Mb;
138
139 Za = GetPlateFormationZone(energy, gamma, va
140 Zb = GetGasFormationZone(energy, gamma, varA
141
142 Ma = GetPlateLinearPhotoAbs(energy);
143 Mb = GetGasLinearPhotoAbs(energy);
144
145 G4complex Ca(1.0 + 0.5 * fPlateThick * Ma /
146 fPlateThick / Za / fAlphaPlate)
147 G4complex Cb(1.0 + 0.5 * fGasThick * Mb / fA
148 fGasThick / Zb / fAlphaGas);
149
150 G4complex Ha = std::pow(Ca, -fAlphaPlate);
151 G4complex Hb = std::pow(Cb, -fAlphaGas);
152 G4complex H = Ha * Hb;
153
154 G4complex F1 = (1.0 - Ha) * (1.0 - Hb) / (1.
155
156 G4complex F2 = (1.0 - Ha) * (1.0 - Ha) * Hb
157 (1.0 - std::pow(H, fPlateNumb
158
159 G4complex R = (F1 + F2) * OneInterfaceXTRdEd
160
161 result = 2.0 * std::real(R);
162
163 return result;
164 }
165