Geant4 11.1.1
Toolkit for the simulation of the passage of particles through matter
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Public Member Functions | List of all members
G4PolarizedIonisationMollerXS Class Reference

#include <G4PolarizedIonisationMollerXS.hh>

+ Inheritance diagram for G4PolarizedIonisationMollerXS:

Public Member Functions

 G4PolarizedIonisationMollerXS ()
 
 ~G4PolarizedIonisationMollerXS () override
 
void Initialize (G4double x, G4double y, G4double phi, const G4StokesVector &p0, const G4StokesVector &p1, G4int flag=0) override
 
G4double XSection (const G4StokesVector &pol2, const G4StokesVector &pol3) override
 
G4double TotalXSection (G4double xmin, G4double xmax, G4double y, const G4StokesVector &pol0, const G4StokesVector &pol1) override
 
G4StokesVector GetPol2 () override
 
G4StokesVector GetPol3 () override
 
G4PolarizedIonisationMollerXS & operator= (const G4PolarizedIonisationMollerXS &right)=delete
 
 G4PolarizedIonisationMollerXS (const G4PolarizedIonisationMollerXS &)=delete
 
- Public Member Functions inherited from G4VPolarizedXS
 G4VPolarizedXS ()
 
virtual ~G4VPolarizedXS ()
 
virtual void Initialize (G4double, G4double, G4double, const G4StokesVector &p0, const G4StokesVector &p1, G4int flag=0)=0
 
virtual G4double XSection (const G4StokesVector &pol2, const G4StokesVector &pol3)=0
 
virtual G4double TotalXSection (G4double xmin, G4double xmax, G4double y, const G4StokesVector &pol0, const G4StokesVector &pol1)
 
virtual G4StokesVector GetPol2 ()
 
virtual G4StokesVector GetPol3 ()
 
G4double GetYmin ()
 
virtual G4double GetXmin (G4double y)
 
virtual G4double GetXmax (G4double y)
 
void SetMaterial (G4double A, G4double Z, G4double coul)
 
G4VPolarizedXS & operator= (const G4VPolarizedXS &right)=delete
 
 G4VPolarizedXS (const G4VPolarizedXS &)=delete
 

Additional Inherited Members

- Protected Member Functions inherited from G4VPolarizedXS
void SetXmin (G4double xmin)
 
void SetXmax (G4double xmax)
 
void SetYmin (G4double ymin)
 
- Protected Attributes inherited from G4VPolarizedXS
G4double fXmin
 
G4double fXmax
 
G4double fYmin
 
G4double fA
 
G4double fZ
 
G4double fCoul
 

Detailed Description

Definition at line 46 of file G4PolarizedIonisationMollerXS.hh.

Constructor & Destructor Documentation

◆ G4PolarizedIonisationMollerXS() [1/2]

G4PolarizedIonisationMollerXS::G4PolarizedIonisationMollerXS ( )

Definition at line 47 of file G4PolarizedIonisationMollerXS.cc.

48 : fPhi0(0.)
49{
50 SetXmax(.5);
51 fPhi2 = G4ThreeVector(0., 0., 0.);
52 fPhi3 = G4ThreeVector(0., 0., 0.);
53}
G4ThreeVector
CLHEP::Hep3Vector G4ThreeVector
Definition: G4ThreeVector.hh:36
G4VPolarizedXS::SetXmax
void SetXmax(G4double xmax)
Definition: G4VPolarizedXS.hh:84

◆ ~G4PolarizedIonisationMollerXS()

G4PolarizedIonisationMollerXS::~G4PolarizedIonisationMollerXS ( )
override

Definition at line 55 of file G4PolarizedIonisationMollerXS.cc.

55{}

◆ G4PolarizedIonisationMollerXS() [2/2]

G4PolarizedIonisationMollerXS::G4PolarizedIonisationMollerXS ( const G4PolarizedIonisationMollerXS &  )
delete

Member Function Documentation

◆ GetPol2()

G4StokesVector G4PolarizedIonisationMollerXS::GetPol2 ( )
overridevirtual

Reimplemented from G4VPolarizedXS.

Definition at line 282 of file G4PolarizedIonisationMollerXS.cc.

283{
284 // Note, mean polarization can not contain correlation effects.
285 return G4StokesVector(1. / fPhi0 * fPhi2);
286}

◆ GetPol3()

G4StokesVector G4PolarizedIonisationMollerXS::GetPol3 ( )
overridevirtual

Reimplemented from G4VPolarizedXS.

Definition at line 287 of file G4PolarizedIonisationMollerXS.cc.

288{
289 // Note, mean polarization can not contain correlation effects.
290 return G4StokesVector(1. / fPhi0 * fPhi3);
291}

◆ Initialize()

void G4PolarizedIonisationMollerXS::Initialize ( G4double  x,
G4double  y,
G4double  phi,
const G4StokesVector &  p0,
const G4StokesVector &  p1,
G4int  flag = 0 
)
overridevirtual

Implements G4VPolarizedXS.

Definition at line 57 of file G4PolarizedIonisationMollerXS.cc.

62{
63 constexpr G4double re2 = classic_electr_radius * classic_electr_radius;
64 G4double gamma2 = gamma * gamma;
65 G4double gmo = (gamma - 1.);
66 G4double gmo2 = (gamma - 1.) * (gamma - 1.);
67 G4double gpo = (gamma + 1.);
68 G4double pref = gamma2 * re2 / (gmo2 * (gamma + 1.0));
69 constexpr G4double sqrttwo = 1.41421356237309504880; // sqrt(2.)
70 G4double f = (-1. + e);
71 G4double e2 = e * e;
72 G4double f2 = f * f;
73
74 G4bool polarized = (!pol0.IsZero()) || (!pol1.IsZero());
75
76 if(flag == 0)
77 polarized = false;
78 // Unpolarised part of XS
79 fPhi0 = gmo2 / gamma2;
80 fPhi0 += ((1. - 2. * gamma) / gamma2) * (1. / e + 1. / (1. - e));
81 fPhi0 += 1. / (e * e) + 1. / ((1. - e) * (1. - e));
82 fPhi0 *= 0.25;
83 // Initial state polarisarion dependence
84 if(polarized)
85 {
86 G4bool usephi = true;
87 if(flag <= 1)
88 usephi = false;
89 G4double xx = (gamma - f * e * gmo * (3. + gamma)) / (4. * f * e * gamma2);
90 G4double yy = (-1. + f * e * gmo2 + 2. * gamma) / (4. * f * e * gamma2);
91 G4double zz = (-(e * gmo * (3. + gamma)) + e2 * gmo * (3. + gamma) +
92 gamma * (-1. + 2. * gamma)) /
93 (4. * f * e * gamma2);
94
95 fPhi0 += xx * pol0.x() * pol1.x() + yy * pol0.y() * pol1.y() +
96 zz * pol0.z() * pol1.z();
97
98 if(usephi)
99 {
100 G4double xy = 0.;
101 G4double xz = -((-1. + 2. * e) * gmo) /
102 (2. * sqrttwo * gamma2 * std::sqrt(-((f * e) / gpo)));
103 G4double yx = 0.;
104 G4double yz = 0.;
105 G4double zx = -((-1. + 2. * e) * gmo) /
106 (2. * sqrttwo * gamma2 * std::sqrt(-((f * e) / gpo)));
107 G4double zy = 0.;
108 fPhi0 += yx * pol0.y() * pol1.x() + xy * pol0.x() * pol1.y();
109 fPhi0 += zx * pol0.z() * pol1.x() + xz * pol0.x() * pol1.z();
110 fPhi0 += zy * pol0.z() * pol1.y() + yz * pol0.y() * pol1.z();
111 }
112 }
113 // Final state polarisarion dependence
114 fPhi2 = G4ThreeVector();
115 fPhi3 = G4ThreeVector();
116
117 if(flag >= 1)
118 {
119 // Final Electron P1
120 // initial electron K1
121 if(!pol0.IsZero())
122 {
123 G4double xxP1K1 =
124 (std::sqrt(gpo / (1. + e2 * gmo + gamma - 2. * e * gamma)) *
125 (gamma - e * gpo)) /
126 (4. * e2 * gamma);
127 G4double xyP1K1 = 0.;
128 G4double xzP1K1 = (-1. + 2. * e * gamma) /
129 (2. * sqrttwo * f * gamma *
130 std::sqrt(e * e2 * (1. + e + gamma - e * gamma)));
131 G4double yxP1K1 = 0.;
132 G4double yyP1K1 =
133 (-gamma2 + e * (-1. + gamma * (2. + gamma))) / (4. * f * e2 * gamma2);
134 G4double yzP1K1 = 0.;
135 G4double zxP1K1 = (1. + 2. * e2 * gmo - 2. * e * gamma) /
136 (2. * sqrttwo * f * e * gamma *
137 std::sqrt(e * (1. + e + gamma - e * gamma)));
138 G4double zyP1K1 = 0.;
139 G4double zzP1K1 =
140 (-gamma + e * (1. - 2. * e * gmo + gamma)) /
141 (4. * f * e2 * gamma * std::sqrt(1. - (2. * e) / (f * gpo)));
142 fPhi2[0] += xxP1K1 * pol0.x() + xyP1K1 * pol0.y() + xzP1K1 * pol0.z();
143 fPhi2[1] += yxP1K1 * pol0.x() + yyP1K1 * pol0.y() + yzP1K1 * pol0.z();
144 fPhi2[2] += zxP1K1 * pol0.x() + zyP1K1 * pol0.y() + zzP1K1 * pol0.z();
145 }
146 // initial electron K2
147 if(!pol1.IsZero())
148 {
149 G4double xxP1K2 =
150 ((1. + e * (-3. + gamma)) *
151 std::sqrt(gpo / (1. + e2 * gmo + gamma - 2. * e * gamma))) /
152 (4. * f * e * gamma);
153 G4double xyP1K2 = 0.;
154 G4double xzP1K2 =
155 (-2. + 2. * e + gamma) / (2. * sqrttwo * f2 * gamma *
156 std::sqrt(e * (1. + e + gamma - e * gamma)));
157 G4double yxP1K2 = 0.;
158 G4double yyP1K2 = (1. - 2. * gamma + e * (-1. + gamma * (2. + gamma))) /
159 (4. * f2 * e * gamma2);
160 G4double yzP1K2 = 0.;
161 G4double zxP1K2 = (2. * e * (1. + e * gmo - 2. * gamma) + gamma) /
162 (2. * sqrttwo * f2 * gamma *
163 std::sqrt(e * (1. + e + gamma - e * gamma)));
164 G4double zyP1K2 = 0.;
165 G4double zzP1K2 =
166 (1. - 2. * gamma + e * (-1. - 2. * e * gmo + 3. * gamma)) /
167 (4. * f2 * e * gamma * std::sqrt(1. - (2. * e) / (f * gpo)));
168 fPhi2[0] += xxP1K2 * pol1.x() + xyP1K2 * pol1.y() + xzP1K2 * pol1.z();
169 fPhi2[1] += yxP1K2 * pol1.x() + yyP1K2 * pol1.y() + yzP1K2 * pol1.z();
170 fPhi2[2] += zxP1K2 * pol1.x() + zyP1K2 * pol1.y() + zzP1K2 * pol1.z();
171 }
172
173 // Final Electron P2
174 // initial electron K1
175 if(!pol0.IsZero())
176 {
177 G4double xxP2K1 =
178 (-1. + e + e * gamma) /
179 (4. * f2 * gamma * std::sqrt((e * (2. + e * gmo)) / gpo));
180 G4double xyP2K1 = 0.;
181 G4double xzP2K1 =
182 -((1. + 2. * f * gamma) * std::sqrt(f / (-2. + e - e * gamma))) /
183 (2. * sqrttwo * f2 * e * gamma);
184 G4double yxP2K1 = 0.;
185 G4double yyP2K1 = (1. - 2. * gamma + e * (-1. + gamma * (2. + gamma))) /
186 (4. * f2 * e * gamma2);
187 G4double yzP2K1 = 0.;
188 G4double zxP2K1 =
189 (1. + 2. * e * (-2. + e + gamma - e * gamma)) /
190 (2. * sqrttwo * f * e * std::sqrt(-(f * (2. + e * gmo))) * gamma);
191 G4double zyP2K1 = 0.;
192 G4double zzP2K1 =
193 (std::sqrt((e * gpo) / (2. + e * gmo)) *
194 (-3. + e * (5. + 2. * e * gmo - 3. * gamma) + 2. * gamma)) /
195 (4. * f2 * e * gamma);
196
197 fPhi3[0] += xxP2K1 * pol0.x() + xyP2K1 * pol0.y() + xzP2K1 * pol0.z();
198 fPhi3[1] += yxP2K1 * pol0.x() + yyP2K1 * pol0.y() + yzP2K1 * pol0.z();
199 fPhi3[2] += zxP2K1 * pol0.x() + zyP2K1 * pol0.y() + zzP2K1 * pol0.z();
200 }
201 // initial electron K2
202 if(!pol1.IsZero())
203 {
204 G4double xxP2K2 =
205 (-2. - e * (-3. + gamma) + gamma) /
206 (4. * f * e * gamma * std::sqrt((e * (2. + e * gmo)) / gpo));
207 G4double xyP2K2 = 0.;
208 G4double xzP2K2 =
209 ((-2. * e + gamma) * std::sqrt(f / (-2. + e - e * gamma))) /
210 (2. * sqrttwo * f * e2 * gamma);
211 G4double yxP2K2 = 0.;
212 G4double yyP2K2 =
213 (-gamma2 + e * (-1. + gamma * (2. + gamma))) / (4. * f * e2 * gamma2);
214 G4double yzP2K2 = 0.;
215 G4double zxP2K2 =
216 (gamma + 2. * e * (-1. + e - e * gamma)) /
217 (2. * sqrttwo * e2 * std::sqrt(-(f * (2. + e * gmo))) * gamma);
218 G4double zyP2K2 = 0.;
219 G4double zzP2K2 = (std::sqrt((e * gpo) / (2. + e * gmo)) *
220 (-2. + e * (3. + 2. * e * gmo - gamma) + gamma)) /
221 (4. * f * e2 * gamma);
222 fPhi3[0] += xxP2K2 * pol1.x() + xyP2K2 * pol1.y() + xzP2K2 * pol1.z();
223 fPhi3[1] += yxP2K2 * pol1.x() + yyP2K2 * pol1.y() + yzP2K2 * pol1.z();
224 fPhi3[2] += zxP2K2 * pol1.x() + zyP2K2 * pol1.y() + zzP2K2 * pol1.z();
225 }
226 }
227 fPhi0 *= pref;
228 fPhi2 *= pref;
229 fPhi3 *= pref;
230}
G4double
double G4double
Definition: G4Types.hh:83
G4bool
bool G4bool
Definition: G4Types.hh:86
CLHEP::Hep3Vector::x
double x() const

◆ operator=()

G4PolarizedIonisationMollerXS & G4PolarizedIonisationMollerXS::operator= ( const G4PolarizedIonisationMollerXS &  right)
delete

◆ TotalXSection()

G4double G4PolarizedIonisationMollerXS::TotalXSection ( G4double  xmin,
G4double  xmax,
G4double  y,
const G4StokesVector &  pol0,
const G4StokesVector &  pol1 
)
overridevirtual

Reimplemented from G4VPolarizedXS.

Definition at line 245 of file G4PolarizedIonisationMollerXS.cc.

248{
249 G4double xs = 0.;
250 G4double x = xmin;
251
252 if(xmax != 0.5)
253 {
254 G4ExceptionDescription ed;
255 ed << " warning xmax expected to be 1/2 but is " << xmax << "\n";
256 G4Exception("G4PolarizedIonisationMollerXS::TotalXSection", "pol020",
257 JustWarning, ed);
258 }
259
260 constexpr G4double re2 = classic_electr_radius * classic_electr_radius;
261 G4double gamma2 = gamma * gamma;
262 G4double gmo2 = (gamma - 1.) * (gamma - 1.);
263 G4double logMEM = std::log(1. / x - 1.);
264 G4double pref = twopi * gamma2 * re2 / (gmo2 * (gamma + 1.0));
265 // unpolarised XS
266 G4double sigma0 = (gmo2 / gamma2) * (0.5 - x);
267 sigma0 += ((1. - 2. * gamma) / gamma2) * logMEM;
268 sigma0 += 1. / x - 1. / (1. - x);
269 // longitudinal part
270 G4double sigma2 = ((gamma2 + 2. * gamma - 3.) / gamma2) * (0.5 - x);
271 sigma2 += (1. / gamma - 2.) * logMEM;
272 // transverse part
273 G4double sigma3 = (2. * (1. - gamma) / gamma2) * (0.5 - x);
274 sigma3 += (1. - 3. * gamma) / (2. * gamma2) * logMEM;
275 // total cross section
276 xs += pref * (sigma0 + sigma2 * pol0.z() * pol1.z() +
277 sigma3 * (pol0.x() * pol1.x() + pol0.y() * pol1.y()));
278
279 return xs;
280}
JustWarning
@ JustWarning
Definition: G4ExceptionSeverity.hh:65
G4Exception
void G4Exception(const char *originOfException, const char *exceptionCode, G4ExceptionSeverity severity, const char *description)
Definition: G4Exception.cc:59
G4ExceptionDescription
std::ostringstream G4ExceptionDescription
Definition: G4Exception.hh:40
CLHEP::Hep3Vector::z
double z() const
CLHEP::Hep3Vector::y
double y() const

◆ XSection()

G4double G4PolarizedIonisationMollerXS::XSection ( const G4StokesVector &  pol2,
const G4StokesVector &  pol3 
)
overridevirtual

Implements G4VPolarizedXS.

Definition at line 232 of file G4PolarizedIonisationMollerXS.cc.

234{
235 G4double xs = fPhi0;
236
237 G4bool polarized = (!pol2.IsZero()) || (!pol3.IsZero());
238 if(polarized)
239 {
240 xs += fPhi2 * pol2 + fPhi3 * pol3;
241 }
242 return xs;
243}
G4StokesVector::IsZero
G4bool IsZero() const
Definition: G4StokesVector.cc:65
The documentation for this class was generated from the following files: