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25 // 25 //
26 26
27 #include "G4TransparentRegXTRadiator.hh" 27 #include "G4TransparentRegXTRadiator.hh"
28 28
29 #include "G4PhysicalConstants.hh" 29 #include "G4PhysicalConstants.hh"
30 30
31 ////////////////////////////////////////////// 31 ////////////////////////////////////////////////////////////////////////////
32 // Constructor, destructor 32 // Constructor, destructor
33 G4TransparentRegXTRadiator::G4TransparentRegXT 33 G4TransparentRegXTRadiator::G4TransparentRegXTRadiator(
34 G4LogicalVolume* anEnvelope, G4Material* foi 34 G4LogicalVolume* anEnvelope, G4Material* foilMat, G4Material* gasMat,
35 G4double a, G4double b, G4int n, const G4Str 35 G4double a, G4double b, G4int n, const G4String& processName)
36 : G4VXTRenergyLoss(anEnvelope, foilMat, gasM 36 : G4VXTRenergyLoss(anEnvelope, foilMat, gasMat, a, b, n, processName)
37 { 37 {
38 if(verboseLevel > 0) 38 if(verboseLevel > 0)
39 G4cout << "Regular transparent X-ray TR r 39 G4cout << "Regular transparent X-ray TR radiator EM process is called"
40 << G4endl; 40 << G4endl;
41 41
42 // Build energy and angular integral spectra 42 // Build energy and angular integral spectra of X-ray TR photons from
43 // a radiator 43 // a radiator
44 44
45 fAlphaPlate = 10000; 45 fAlphaPlate = 10000;
46 fAlphaGas = 1000; 46 fAlphaGas = 1000;
47 } 47 }
48 48
49 ////////////////////////////////////////////// 49 ///////////////////////////////////////////////////////////////////////////
50 G4TransparentRegXTRadiator::~G4TransparentRegX << 50 G4TransparentRegXTRadiator::~G4TransparentRegXTRadiator() {}
51 51
52 ////////////////////////////////////////////// 52 ///////////////////////////////////////////////////////////////////////////
53 void G4TransparentRegXTRadiator::ProcessDescri 53 void G4TransparentRegXTRadiator::ProcessDescription(std::ostream& out) const
54 { 54 {
55 out << "Simulation of forward X-ray transiti 55 out << "Simulation of forward X-ray transition radiation generated by\n"
56 "relativistic charged particles cross 56 "relativistic charged particles crossing the interface between\n"
57 "two materials.\n"; 57 "two materials.\n";
58 } 58 }
59 59
60 ////////////////////////////////////////////// 60 ///////////////////////////////////////////////////////////////////////////
61 G4double G4TransparentRegXTRadiator::SpectralX 61 G4double G4TransparentRegXTRadiator::SpectralXTRdEdx(G4double energy)
62 { 62 {
63 G4double result, sum = 0., tmp, cof1, cof2, 63 G4double result, sum = 0., tmp, cof1, cof2, cofMin, cofPHC, theta2, theta2k;
64 G4int k, kMax, kMin; 64 G4int k, kMax, kMin;
65 65
66 cofPHC = 4. * pi * hbarc; 66 cofPHC = 4. * pi * hbarc;
67 tmp = (fSigma1 - fSigma2) / cofPHC / ener 67 tmp = (fSigma1 - fSigma2) / cofPHC / energy;
68 cof1 = fPlateThick * tmp; 68 cof1 = fPlateThick * tmp;
69 cof2 = fGasThick * tmp; 69 cof2 = fGasThick * tmp;
70 70
71 cofMin = energy * (fPlateThick + fGasThick) 71 cofMin = energy * (fPlateThick + fGasThick) / fGamma / fGamma;
72 cofMin += (fPlateThick * fSigma1 + fGasThick 72 cofMin += (fPlateThick * fSigma1 + fGasThick * fSigma2) / energy;
73 cofMin /= cofPHC; 73 cofMin /= cofPHC;
74 74
75 theta2 = cofPHC / (energy * (fPlateThick + f 75 theta2 = cofPHC / (energy * (fPlateThick + fGasThick));
76 76
77 kMin = G4int(cofMin); 77 kMin = G4int(cofMin);
78 if(cofMin > kMin) 78 if(cofMin > kMin)
79 kMin++; 79 kMin++;
80 80
81 kMax = kMin + 49; 81 kMax = kMin + 49;
82 82
83 if(verboseLevel > 2) 83 if(verboseLevel > 2)
84 { 84 {
85 G4cout << cof1 << " " << cof2 << " 85 G4cout << cof1 << " " << cof2 << " " << cofMin << G4endl;
86 G4cout << "kMin = " << kMin << "; kMax 86 G4cout << "kMin = " << kMin << "; kMax = " << kMax << G4endl;
87 } 87 }
88 for(k = kMin; k <= kMax; ++k) 88 for(k = kMin; k <= kMax; ++k)
89 { 89 {
90 tmp = pi * fPlateThick * (k + cof2) / ( 90 tmp = pi * fPlateThick * (k + cof2) / (fPlateThick + fGasThick);
91 result = (k - cof1) * (k - cof1) * (k + co 91 result = (k - cof1) * (k - cof1) * (k + cof2) * (k + cof2);
92 if(k == kMin && kMin == G4int(cofMin)) 92 if(k == kMin && kMin == G4int(cofMin))
93 { 93 {
94 sum += 94 sum +=
95 0.5 * std::sin(tmp) * std::sin(tmp) * 95 0.5 * std::sin(tmp) * std::sin(tmp) * std::abs(k - cofMin) / result;
96 } 96 }
97 else 97 else
98 { 98 {
99 sum += std::sin(tmp) * std::sin(tmp) * s 99 sum += std::sin(tmp) * std::sin(tmp) * std::abs(k - cofMin) / result;
100 } 100 }
101 theta2k = std::sqrt(theta2 * std::abs(k - 101 theta2k = std::sqrt(theta2 * std::abs(k - cofMin));
102 102
103 if(verboseLevel > 2) 103 if(verboseLevel > 2)
104 { 104 {
105 G4cout << k << " " << theta2k << " 105 G4cout << k << " " << theta2k << " "
106 << std::sin(tmp) * std::sin(tmp) 106 << std::sin(tmp) * std::sin(tmp) * std::abs(k - cofMin) / result
107 << " " << sum << G4endl; 107 << " " << sum << G4endl;
108 } 108 }
109 } 109 }
110 result = 4. * (cof1 + cof2) * (cof1 + cof2) 110 result = 4. * (cof1 + cof2) * (cof1 + cof2) * sum / energy;
111 result *= fPlateNumber; 111 result *= fPlateNumber;
112 112
113 return result; 113 return result;
114 } 114 }
115 115
116 ////////////////////////////////////////////// 116 ///////////////////////////////////////////////////////////////////////////
117 // Approximation for radiator interference fac 117 // Approximation for radiator interference factor for the case of
118 // fully Regular radiator. The plate and gas g 118 // fully Regular radiator. The plate and gas gap thicknesses are fixed.
119 // The mean values of the plate and gas gap th 119 // The mean values of the plate and gas gap thicknesses
120 // are supposed to be about XTR formation zone 120 // are supposed to be about XTR formation zones but much less than
121 // mean absorption length of XTR photons in co 121 // mean absorption length of XTR photons in corresponding material.
122 G4double G4TransparentRegXTRadiator::GetStackF 122 G4double G4TransparentRegXTRadiator::GetStackFactor(G4double energy,
123 123 G4double gamma,
124 124 G4double varAngle)
125 { 125 {
126 G4double result, Qa, Qb, Q, aZa, bZb, aMa, b 126 G4double result, Qa, Qb, Q, aZa, bZb, aMa, bMb, D, sigma;
127 127
128 aZa = fPlateThick / GetPlateFormationZone( 128 aZa = fPlateThick / GetPlateFormationZone(energy, gamma, varAngle);
129 bZb = fGasThick / GetGasFormationZone(ener 129 bZb = fGasThick / GetGasFormationZone(energy, gamma, varAngle);
130 aMa = fPlateThick * GetPlateLinearPhotoAbs 130 aMa = fPlateThick * GetPlateLinearPhotoAbs(energy);
131 bMb = fGasThick * GetGasLinearPhotoAbs(ene 131 bMb = fGasThick * GetGasLinearPhotoAbs(energy);
132 sigma = aMa * fPlateThick + bMb * fGasThick; 132 sigma = aMa * fPlateThick + bMb * fGasThick;
133 Qa = std::exp(-0.5 * aMa); 133 Qa = std::exp(-0.5 * aMa);
134 Qb = std::exp(-0.5 * bMb); 134 Qb = std::exp(-0.5 * bMb);
135 Q = Qa * Qb; 135 Q = Qa * Qb;
136 136
137 G4complex Ha(Qa * std::cos(aZa), -Qa * std:: 137 G4complex Ha(Qa * std::cos(aZa), -Qa * std::sin(aZa));
138 G4complex Hb(Qb * std::cos(bZb), -Qb * std:: 138 G4complex Hb(Qb * std::cos(bZb), -Qb * std::sin(bZb));
139 G4complex H = Ha * Hb; 139 G4complex H = Ha * Hb;
140 G4complex Hs = conj(H); 140 G4complex Hs = conj(H);
141 D = 1.0 / ((1 - Q) * (1 - Q) + 141 D = 1.0 / ((1 - Q) * (1 - Q) +
142 4 * Q * std::sin(0.5 * (aZa + bZb 142 4 * Q * std::sin(0.5 * (aZa + bZb)) * std::sin(0.5 * (aZa + bZb)));
143 G4complex F1 = 143 G4complex F1 =
144 (1.0 - Ha) * (1.0 - Hb) * (1.0 - Hs) * G4d 144 (1.0 - Ha) * (1.0 - Hb) * (1.0 - Hs) * G4double(fPlateNumber) * D;
145 G4complex F2 = (1.0 - Ha) * (1.0 - Ha) * Hb 145 G4complex F2 = (1.0 - Ha) * (1.0 - Ha) * Hb * (1.0 - Hs) * (1.0 - Hs) *
146 (1.0 - std::exp(-0.5 * fPlate 146 (1.0 - std::exp(-0.5 * fPlateNumber * sigma)) * D * D;
147 G4complex R = (F1 + F2) * OneInterfaceXTRdEd 147 G4complex R = (F1 + F2) * OneInterfaceXTRdEdx(energy, gamma, varAngle);
148 result = 2.0 * std::real(R); 148 result = 2.0 * std::real(R);
149 return result; 149 return result;
150 } 150 }
151 151