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25 // 25 //
>> 26 //
>> 27 // $Id: G4TransparentRegXTRadiator.cc,v 1.11 2007/09/29 17:49:34 vnivanch Exp $
>> 28 // GEANT4 tag $Name: geant4-09-01-patch-01 $
>> 29 //
>> 30
>> 31 #include <complex>
26 32
27 #include "G4TransparentRegXTRadiator.hh" 33 #include "G4TransparentRegXTRadiator.hh"
>> 34 #include "Randomize.hh"
>> 35 #include "G4Integrator.hh"
>> 36 #include "G4Gamma.hh"
28 37
29 #include "G4PhysicalConstants.hh" << 38 using namespace std;
30 39
31 ////////////////////////////////////////////// 40 ////////////////////////////////////////////////////////////////////////////
>> 41 //
32 // Constructor, destructor 42 // Constructor, destructor
33 G4TransparentRegXTRadiator::G4TransparentRegXT << 43
34 G4LogicalVolume* anEnvelope, G4Material* foi << 44 G4TransparentRegXTRadiator::G4TransparentRegXTRadiator(G4LogicalVolume *anEnvelope,
35 G4double a, G4double b, G4int n, const G4Str << 45 G4Material* foilMat,G4Material* gasMat,
36 : G4VXTRenergyLoss(anEnvelope, foilMat, gasM << 46 G4double a, G4double b, G4int n,
>> 47 const G4String& processName) :
>> 48 G4VXTRenergyLoss(anEnvelope,foilMat,gasMat,a,b,n,processName)
37 { 49 {
38 if(verboseLevel > 0) 50 if(verboseLevel > 0)
39 G4cout << "Regular transparent X-ray TR r << 51 G4cout<<"Regular transparent X-ray TR radiator EM process is called"<<G4endl;
40 << G4endl; <<
41 52
42 // Build energy and angular integral spectra 53 // Build energy and angular integral spectra of X-ray TR photons from
43 // a radiator 54 // a radiator
44 55
45 fAlphaPlate = 10000; 56 fAlphaPlate = 10000;
46 fAlphaGas = 1000; 57 fAlphaGas = 1000;
>> 58
>> 59 // BuildTable();
47 } 60 }
48 61
49 ////////////////////////////////////////////// 62 ///////////////////////////////////////////////////////////////////////////
50 G4TransparentRegXTRadiator::~G4TransparentRegX <<
51 63
52 ////////////////////////////////////////////// << 64 G4TransparentRegXTRadiator::~G4TransparentRegXTRadiator()
53 void G4TransparentRegXTRadiator::ProcessDescri <<
54 { 65 {
55 out << "Simulation of forward X-ray transiti << 66 ;
56 "relativistic charged particles cross <<
57 "two materials.\n"; <<
58 } 67 }
59 68
60 ////////////////////////////////////////////// 69 ///////////////////////////////////////////////////////////////////////////
>> 70 //
>> 71 //
>> 72
61 G4double G4TransparentRegXTRadiator::SpectralX 73 G4double G4TransparentRegXTRadiator::SpectralXTRdEdx(G4double energy)
62 { 74 {
63 G4double result, sum = 0., tmp, cof1, cof2, << 75 G4double result, sum = 0., tmp, cof1, cof2, cofMin, cofPHC,aMa, bMb, sigma;
64 G4int k, kMax, kMin; 76 G4int k, kMax, kMin;
65 77
66 cofPHC = 4. * pi * hbarc; << 78 aMa = fPlateThick*GetPlateLinearPhotoAbs(energy);
67 tmp = (fSigma1 - fSigma2) / cofPHC / ener << 79 bMb = fGasThick*GetGasLinearPhotoAbs(energy);
68 cof1 = fPlateThick * tmp; << 80 sigma = aMa + bMb;
69 cof2 = fGasThick * tmp; << 81
>> 82 cofPHC = 4*pi*hbarc;
>> 83 tmp = (fSigma1 - fSigma2)/cofPHC/energy;
>> 84 cof1 = fPlateThick*tmp;
>> 85 cof2 = fGasThick*tmp;
70 86
71 cofMin = energy * (fPlateThick + fGasThick) << 87 cofMin = energy*(fPlateThick + fGasThick)/fGamma/fGamma;
72 cofMin += (fPlateThick * fSigma1 + fGasThick << 88 cofMin += (fPlateThick*fSigma1 + fGasThick*fSigma2)/energy;
73 cofMin /= cofPHC; 89 cofMin /= cofPHC;
74 90
75 theta2 = cofPHC / (energy * (fPlateThick + f << 91 // if (fGamma < 1200) kMin = G4int(cofMin); // 1200 ?
>> 92 // else kMin = 1;
>> 93
76 94
77 kMin = G4int(cofMin); 95 kMin = G4int(cofMin);
78 if(cofMin > kMin) << 96 if (cofMin > kMin) kMin++;
79 kMin++; <<
80 97
81 kMax = kMin + 49; << 98 // tmp = (fPlateThick + fGasThick)*energy*fMaxThetaTR;
>> 99 // tmp /= cofPHC;
>> 100 // kMax = G4int(tmp);
>> 101 // if(kMax < 0) kMax = 0;
>> 102 // kMax += kMin;
>> 103
>> 104
>> 105 kMax = kMin + 19; // 9; // kMin + G4int(tmp);
>> 106
>> 107 // tmp /= fGamma;
>> 108 // if( G4int(tmp) < kMin ) kMin = G4int(tmp);
>> 109 // G4cout<<"kMin = "<<kMin<<"; kMax = "<<kMax<<G4endl;
82 110
83 if(verboseLevel > 2) << 111 for( k = kMin; k <= kMax; k++ )
84 { 112 {
85 G4cout << cof1 << " " << cof2 << " << 113 tmp = pi*fPlateThick*(k + cof2)/(fPlateThick + fGasThick);
86 G4cout << "kMin = " << kMin << "; kMax << 114 result = (k - cof1)*(k - cof1)*(k + cof2)*(k + cof2);
87 } << 115 // tmp = sin(tmp)*sin(tmp)*abs(k-cofMin)/result;
88 for(k = kMin; k <= kMax; ++k) << 116 if( k == kMin && kMin == G4int(cofMin) )
89 { <<
90 tmp = pi * fPlateThick * (k + cof2) / ( <<
91 result = (k - cof1) * (k - cof1) * (k + co <<
92 if(k == kMin && kMin == G4int(cofMin)) <<
93 { 117 {
94 sum += << 118 sum += 0.5*sin(tmp)*sin(tmp)*abs(k-cofMin)/result;
95 0.5 * std::sin(tmp) * std::sin(tmp) * <<
96 } 119 }
97 else 120 else
98 { 121 {
99 sum += std::sin(tmp) * std::sin(tmp) * s << 122 sum += sin(tmp)*sin(tmp)*abs(k-cofMin)/result;
100 } 123 }
101 theta2k = std::sqrt(theta2 * std::abs(k - <<
102 <<
103 if(verboseLevel > 2) 124 if(verboseLevel > 2)
104 { << 125 {
105 G4cout << k << " " << theta2k << " << 126 G4cout<<"k = "<<k<<"; tmp = "<<sin(tmp)*sin(tmp)*abs(k-cofMin)/result
106 << std::sin(tmp) * std::sin(tmp) << 127 <<"; sum = "<<sum<<G4endl;
107 << " " << sum << G4endl; << 128 }
108 } <<
109 } 129 }
110 result = 4. * (cof1 + cof2) * (cof1 + cof2) << 130 result = 4*( cof1 + cof2 )*( cof1 + cof2 )*sum/energy;
111 result *= fPlateNumber; << 131 // result *= ( 1 - exp(-0.5*fPlateNumber*sigma) )/( 1 - exp(-0.5*sigma) );
112 << 132 // fPlateNumber;
>> 133 result *= fPlateNumber; // *exp(-0.5*fPlateNumber*sigma);
>> 134 // +1-exp(-0.5*fPlateNumber*sigma);
>> 135 /*
>> 136 fEnergy = energy;
>> 137 // G4Integrator<G4VXTRenergyLoss,G4double(G4VXTRenergyLoss::*)(G4double)> integral;
>> 138 G4Integrator<G4TransparentRegXTRadiator,G4double(G4VXTRenergyLoss::*)(G4double)> integral;
>> 139
>> 140 tmp = integral.Legendre96(this,&G4VXTRenergyLoss::SpectralAngleXTRdEdx,
>> 141 0.0,0.3*fMaxThetaTR) +
>> 142 integral.Legendre96(this,&G4VXTRenergyLoss::SpectralAngleXTRdEdx,
>> 143 0.3*fMaxThetaTR,0.6*fMaxThetaTR) +
>> 144 integral.Legendre96(this,&G4VXTRenergyLoss::SpectralAngleXTRdEdx,
>> 145 0.6*fMaxThetaTR,fMaxThetaTR) ;
>> 146 result += tmp;
>> 147 */
113 return result; 148 return result;
114 } 149 }
115 150
>> 151
116 ////////////////////////////////////////////// 152 ///////////////////////////////////////////////////////////////////////////
>> 153 //
117 // Approximation for radiator interference fac 154 // Approximation for radiator interference factor for the case of
118 // fully Regular radiator. The plate and gas g << 155 // fully Regular radiator. The plate and gas gap thicknesses are fixed .
119 // The mean values of the plate and gas gap th << 156 // The mean values of the plate and gas gap thicknesses
120 // are supposed to be about XTR formation zone << 157 // are supposed to be about XTR formation zones but much less than
121 // mean absorption length of XTR photons in co << 158 // mean absorption length of XTR photons in coresponding material.
122 G4double G4TransparentRegXTRadiator::GetStackF << 159
123 << 160 G4double
124 << 161 G4TransparentRegXTRadiator::GetStackFactor( G4double energy,
>> 162 G4double gamma, G4double varAngle )
125 { 163 {
126 G4double result, Qa, Qb, Q, aZa, bZb, aMa, b << 164 /*
127 << 165 G4double result, Za, Zb, Ma, Mb, sigma;
128 aZa = fPlateThick / GetPlateFormationZone( << 166
129 bZb = fGasThick / GetGasFormationZone(ener << 167 Za = GetPlateFormationZone(energy,gamma,varAngle);
130 aMa = fPlateThick * GetPlateLinearPhotoAbs << 168 Zb = GetGasFormationZone(energy,gamma,varAngle);
131 bMb = fGasThick * GetGasLinearPhotoAbs(ene << 169 Ma = GetPlateLinearPhotoAbs(energy);
132 sigma = aMa * fPlateThick + bMb * fGasThick; << 170 Mb = GetGasLinearPhotoAbs(energy);
133 Qa = std::exp(-0.5 * aMa); << 171 sigma = Ma*fPlateThick + Mb*fGasThick;
134 Qb = std::exp(-0.5 * bMb); << 172
135 Q = Qa * Qb; << 173 G4complex Ca(1.0+0.5*fPlateThick*Ma/fAlphaPlate,fPlateThick/Za/fAlphaPlate);
136 << 174 G4complex Cb(1.0+0.5*fGasThick*Mb/fAlphaGas,fGasThick/Zb/fAlphaGas);
137 G4complex Ha(Qa * std::cos(aZa), -Qa * std:: << 175
138 G4complex Hb(Qb * std::cos(bZb), -Qb * std:: << 176 G4complex Ha = pow(Ca,-fAlphaPlate);
139 G4complex H = Ha * Hb; << 177 G4complex Hb = pow(Cb,-fAlphaGas);
>> 178 G4complex H = Ha*Hb;
>> 179 G4complex F1 = (1.0 - Ha)*(1.0 - Hb )/(1.0 - H)
>> 180 * G4double(fPlateNumber) ;
>> 181 G4complex F2 = (1.0-Ha)*(1.0-Ha)*Hb/(1.0-H)/(1.0-H)
>> 182 * (1.0 - exp(-0.5*fPlateNumber*sigma)) ;
>> 183 // *(1.0 - pow(H,fPlateNumber)) ;
>> 184 G4complex R = (F1 + F2)*OneInterfaceXTRdEdx(energy,gamma,varAngle);
>> 185 // G4complex R = F2*OneInterfaceXTRdEdx(energy,gamma,varAngle);
>> 186 result = 2.0*real(R);
>> 187 return result;
>> 188 */
>> 189 // numerically unstable result
>> 190
>> 191 G4double result, Qa, Qb, Q, aZa, bZb, aMa, bMb, D, sigma;
>> 192
>> 193 aZa = fPlateThick/GetPlateFormationZone(energy,gamma,varAngle);
>> 194 bZb = fGasThick/GetGasFormationZone(energy,gamma,varAngle);
>> 195 aMa = fPlateThick*GetPlateLinearPhotoAbs(energy);
>> 196 bMb = fGasThick*GetGasLinearPhotoAbs(energy);
>> 197 sigma = aMa*fPlateThick + bMb*fGasThick;
>> 198 Qa = exp(-0.5*aMa);
>> 199 Qb = exp(-0.5*bMb);
>> 200 Q = Qa*Qb;
>> 201
>> 202 G4complex Ha( Qa*cos(aZa), -Qa*sin(aZa) );
>> 203 G4complex Hb( Qb*cos(bZb), -Qb*sin(bZb) );
>> 204 G4complex H = Ha*Hb;
140 G4complex Hs = conj(H); 205 G4complex Hs = conj(H);
141 D = 1.0 / ((1 - Q) * (1 - Q) + << 206 D = 1.0 /( (1 - Q)*(1 - Q) +
142 4 * Q * std::sin(0.5 * (aZa + bZb << 207 4*Q*sin(0.5*(aZa + bZb))*sin(0.5*(aZa + bZb)) );
143 G4complex F1 = << 208 G4complex F1 = (1.0 - Ha)*(1.0 - Hb)*(1.0 - Hs)
144 (1.0 - Ha) * (1.0 - Hb) * (1.0 - Hs) * G4d << 209 * G4double(fPlateNumber)*D;
145 G4complex F2 = (1.0 - Ha) * (1.0 - Ha) * Hb << 210 G4complex F2 = (1.0 - Ha)*(1.0 - Ha)*Hb*(1.0 - Hs)*(1.0 - Hs)
146 (1.0 - std::exp(-0.5 * fPlate << 211 // * (1.0 - pow(H,fPlateNumber)) * D*D;
147 G4complex R = (F1 + F2) * OneInterfaceXTRdEd << 212 * (1.0 - exp(-0.5*fPlateNumber*sigma)) * D*D;
148 result = 2.0 * std::real(R); << 213 G4complex R = (F1 + F2)*OneInterfaceXTRdEdx(energy,gamma,varAngle);
149 return result; << 214 result = 2.0*real(R);
>> 215 return result;
>> 216
150 } 217 }
>> 218
>> 219
>> 220 //
>> 221 //
>> 222 ////////////////////////////////////////////////////////////////////////////
>> 223
>> 224
>> 225
>> 226
>> 227
>> 228
>> 229
>> 230
151 231