ECCE @ EIC Software
Reference for
ECCE @ EIC
simulation and reconstruction software on GitHub
Home page
Related Pages
Modules
Namespaces
Classes
Files
External Links
File List
File Members
All
Classes
Namespaces
Files
Functions
Variables
Typedefs
Enumerations
Enumerator
Friends
Macros
Groups
Pages
G4VPhononProcess.cc
Go to the documentation of this file.
Or view
the newest version in sPHENIX GitHub for file G4VPhononProcess.cc
1
//
2
// ********************************************************************
3
// * License and Disclaimer *
4
// * *
5
// * The Geant4 software is copyright of the Copyright Holders of *
6
// * the Geant4 Collaboration. It is provided under the terms and *
7
// * conditions of the Geant4 Software License, included in the file *
8
// * LICENSE and available at http://cern.ch/geant4/license . These *
9
// * include a list of copyright holders. *
10
// * *
11
// * Neither the authors of this software system, nor their employing *
12
// * institutes,nor the agencies providing financial support for this *
13
// * work make any representation or warranty, express or implied, *
14
// * regarding this software system or assume any liability for its *
15
// * use. Please see the license in the file LICENSE and URL above *
16
// * for the full disclaimer and the limitation of liability. *
17
// * *
18
// * This code implementation is the result of the scientific and *
19
// * technical work of the GEANT4 collaboration. *
20
// * By using, copying, modifying or distributing the software (or *
21
// * any work based on the software) you agree to acknowledge its *
22
// * use in resulting scientific publications, and indicate your *
23
// * acceptance of all terms of the Geant4 Software license. *
24
// ********************************************************************
25
//
28
//
29
//
30
// 20131111 Add verbosity to report creating secondaries
31
32
#include "
G4VPhononProcess.hh
"
33
#include "
G4DynamicParticle.hh
"
34
#include "
G4ExceptionSeverity.hh
"
35
#include "
G4LatticeManager.hh
"
36
#include "
G4LatticePhysical.hh
"
37
#include "
G4ParticleDefinition.hh
"
38
#include "
G4PhononLong.hh
"
39
#include "
G4PhononPolarization.hh
"
40
#include "
G4PhononTrackMap.hh
"
41
#include "
G4PhononTransFast.hh
"
42
#include "
G4PhononTransSlow.hh
"
43
#include "
G4ProcessType.hh
"
44
#include "
G4ThreeVector.hh
"
45
#include "
G4Track.hh
"
46
47
namespace
{
48
const
G4ThreeVector
nullVec(0.,0.,0.);
// For convenience below
49
}
50
51
// Constructor and destructor
52
53
G4VPhononProcess::G4VPhononProcess
(
const
G4String
& processName)
54
:
G4VDiscreteProcess
(processName,
fPhonon
),
55
trackKmap(
G4PhononTrackMap
::
GetInstance
()), theLattice(0),
56
currentTrack(0) {}
57
58
G4VPhononProcess::~G4VPhononProcess
() {;}
59
60
61
// Only applies to the known phonon polarization states
62
63
G4bool
G4VPhononProcess::IsApplicable
(
const
G4ParticleDefinition
& aPD) {
64
return
(&aPD==
G4PhononLong::Definition
() ||
65
&aPD==
G4PhononTransFast::Definition
() ||
66
&aPD==
G4PhononTransSlow::Definition
() );
67
}
68
69
70
// Initialize wave vectors for currently active track(s)
71
72
void
G4VPhononProcess::StartTracking
(
G4Track
*
track
) {
73
G4VProcess::StartTracking
(track);
// Apply base class actions
74
75
// FIXME: THE WAVEVECTOR SHOULD BE COMPUTED BY INVERTING THE K/V MAP
76
if
(!
trackKmap
->
Find
(track))
77
trackKmap
->
SetK
(track, track->
GetMomentumDirection
());
78
79
currentTrack
=
track
;
// Save for use by EndTracking
80
81
// Fetch lattice for current track once, use in subsequent steps
82
G4LatticeManager
* LM =
G4LatticeManager::GetLatticeManager
();
83
theLattice
= LM->
GetLattice
(track->
GetVolume
());
84
}
85
86
void
G4VPhononProcess::EndTracking
() {
87
G4VProcess::EndTracking
();
// Apply base class actions
88
trackKmap
->
RemoveTrack
(
currentTrack
);
89
currentTrack
= 0;
90
theLattice
= 0;
91
}
92
93
94
// For convenience, map phonon type to polarization code
95
96
G4int
G4VPhononProcess::GetPolarization
(
const
G4Track
&
track
)
const
{
97
return
G4PhononPolarization::Get
(track.
GetParticleDefinition
());
98
}
99
100
101
// Generate random polarization from density of states
102
103
G4int
G4VPhononProcess::ChoosePolarization
(
G4double
Ldos,
G4double
STdos,
104
G4double
FTdos)
const
{
105
G4double
norm
= Ldos + STdos + FTdos;
106
G4double
cProbST = STdos/
norm
;
107
G4double
cProbFT = FTdos/norm + cProbST;
108
109
// NOTE: Order of selection done to match previous random sequences
110
G4double
modeMixer =
G4UniformRand
();
111
if
(modeMixer<cProbST)
return
G4PhononPolarization::TransSlow
;
112
if
(modeMixer<cProbFT)
return
G4PhononPolarization::TransFast
;
113
return
G4PhononPolarization::Long
;
114
}
115
116
117
// Create new secondary track from phonon configuration
118
119
G4Track
*
G4VPhononProcess::CreateSecondary
(
G4int
polarization,
120
const
G4ThreeVector
& waveVec,
121
G4double
energy
)
const
{
122
if
(
verboseLevel
>1) {
123
G4cout
<<
GetProcessName
() <<
" CreateSecondary pol "
<< polarization
124
<<
" K "
<< waveVec <<
" E "
<< energy <<
G4endl
;
125
}
126
127
G4ThreeVector
vgroup =
theLattice
->
MapKtoVDir
(polarization, waveVec);
128
if
(
verboseLevel
>1)
G4cout
<<
" MapKtoVDir returned "
<< vgroup <<
G4endl
;
129
130
vgroup =
theLattice
->
RotateToGlobal
(vgroup);
131
if
(
verboseLevel
>1)
G4cout
<<
" RotateToGlobal returned "
<< vgroup <<
G4endl
;
132
133
if
(
verboseLevel
&& std::fabs(vgroup.
mag
()-1.) > 0.01) {
134
G4cout
<<
"WARNING: "
<<
GetProcessName
() <<
" vgroup not a unit vector: "
135
<< vgroup <<
G4endl
;
136
}
137
138
G4ParticleDefinition
* thePhonon =
G4PhononPolarization::Get
(polarization);
139
140
// Secondaries are created at the current track coordinates
141
G4Track
* sec =
new
G4Track
(
new
G4DynamicParticle
(thePhonon, vgroup, energy),
142
currentTrack
->
GetGlobalTime
(),
143
currentTrack
->
GetPosition
());
144
145
// Store wavevector in lookup table for future tracking
146
trackKmap
->
SetK
(sec,
theLattice
->
RotateToGlobal
(waveVec));
147
148
if
(
verboseLevel
>1) {
149
G4cout
<<
GetProcessName
() <<
" secondary K rotated to "
150
<<
trackKmap
->
GetK
(sec) <<
G4endl
;
151
}
152
153
sec->
SetVelocity
(
theLattice
->
MapKtoV
(polarization, waveVec));
154
sec->
UseGivenVelocity
(
true
);
155
156
return
sec;
157
}
geant4
tree
geant4-10.6-release
source
processes
solidstate
phonon
src
G4VPhononProcess.cc
Built by
Jin Huang
. updated:
Wed Jun 29 2022 17:25:52
using
1.8.2 with
ECCE GitHub integration