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25 //
26 // 19.09.21 V. Grichine, first version
27 //
28
29 #include "G4GaussXTRadiator.hh"
30
31 #include "G4PhysicalConstants.hh"
32
33 //////////////////////////////////////////////
34 // Constructor, destructor
35
36 G4GaussXTRadiator::G4GaussXTRadiator(
37 G4LogicalVolume* anEnvelope, G4double alph
38 G4double a, G4double b, G4int n, const G4Str
39 : G4VXTRenergyLoss(anEnvelope, foilMat, gasM
40 {
41 if(verboseLevel > 0)
42 G4cout << "Gauss X-ray TR radiator EM pro
43 << G4endl;
44
45 fAlphaPlate = alphaPlate;
46 fAlphaGas = alphaGas; // 1000; //
47 }
48
49 //////////////////////////////////////////////
50 G4GaussXTRadiator::~G4GaussXTRadiator() = defa
51
52 //////////////////////////////////////////////
53 void G4GaussXTRadiator::ProcessDescription(std
54 {
55 out << "Simulation of forward X-ray transiti
56 "relativistic charged particles cross
57 "two materials.\n";
58 }
59
60 //////////////////////////////////////////////
61 //
62 // The Fabian-Strujinsky (FS) algorithm for in
63 // resolution is about 0.1-0.5 mrad
64
65 G4double G4GaussXTRadiator::SpectralXTRdEdx(G4
66 {
67 G4double result, sum = 0., tmp, cof1, cof2,
68 G4int k, kMax, kMin;
69
70 cofPHC = 4. * pi * hbarc;
71 tmp = (fSigma1 - fSigma2) / cofPHC / ener
72 cof1 = fPlateThick * tmp;
73 cof2 = fGasThick * tmp;
74
75 cofMin = energy * (fPlateThick + fGasThick)
76 cofMin += (fPlateThick * fSigma1 + fGasThick
77 cofMin /= cofPHC;
78
79 theta2 = cofPHC / (energy * (fPlateThick + f
80
81 kMin = G4int(cofMin);
82 if(cofMin > kMin)
83 kMin++;
84
85 kMax = kMin + fKrange;
86
87 if(verboseLevel > 2)
88 {
89 G4cout << cof1 << " " << cof2 << "
90 G4cout << "kMin = " << kMin << "; kMax
91 }
92 for(k = kMin; k <= kMax; ++k)
93 {
94 tmp = pi * fPlateThick * (k + cof2) / (
95 result = (k - cof1) * (k - cof1) * (k + co
96 if(k == kMin && kMin == G4int(cofMin))
97 {
98 sum +=
99 0.5 * std::sin(tmp) * std::sin(tmp) *
100 }
101 else
102 {
103 sum += std::sin(tmp) * std::sin(tmp) * s
104 }
105 theta2k = std::sqrt(theta2 * std::abs(k -
106
107 if(verboseLevel > 2)
108 {
109 G4cout << k << " " << theta2k << "
110 << std::sin(tmp) * std::sin(tmp)
111 << " " << sum << G4endl;
112 }
113 }
114 result = 4. * (cof1 + cof2) * (cof1 + cof2)
115 result *= fPlateNumber;
116
117 return result;
118 }
119
120 //////////////////////////////////////////////
121 //
122 // Approximation for radiator interference fac
123 // Gauss-distributed regular radiator. The pla
124 // sa and sb for plate and gas, respectively.
125 // The mean values of the plate and gas gap th
126 // are supposed to be about XTR formation zone
127
128
129 G4double G4GaussXTRadiator::GetStackFactor(G4d
130
131
132 {
133 G4double result(0.);
134 G4double sa = fPlateThick/fAlphaPlate;
135 G4double sb = fGasThick/fAlphaGas;
136 G4double nn = G4double(fPlateNumber);
137
138 G4complex med( 0., 1.);
139 G4complex Z1 = GetPlateComplexFZ( energy,
140 G4complex order1 = -0.5*med*fPlateThick/Z1 -
141
142 G4complex Z2 = GetGasComplexFZ( energy, ga
143 G4complex order2 = -0.5*med*fGasThick/Z2 - 0
144
145 G4complex ordernn = ( order1 + order2 )*nn;
146
147 G4complex Ha = std::exp( order1 );
148 G4complex Hb = std::exp( order2 );
149 G4complex H = Ha * Hb;
150 G4complex Hn = std::exp( ordernn );
151
152 G4complex F1 = ( 1.0 - Ha ) * ( 1.0 - Hb ) *
153
154 G4complex F2 = ( 1.0 - Ha ) * ( 1.0 - Ha ) *
155
156 G4complex R = (F1 + F2) * OneInterfaceXTRdEd
157
158 result = 2.0 * std::real(R);
159
160 return result;
161 }
162