/[PAMELA software]/PamVMC/s4/src/PamVMCS4Dig.cxx
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Contents of /PamVMC/s4/src/PamVMCS4Dig.cxx

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Revision 1.5 - (show annotations) (download)
Fri Jun 12 18:39:27 2009 UTC (15 years, 6 months ago) by pam-rm2
Branch: MAIN
CVS Tags: v1r0, HEAD
Changes since 1.1: +0 -0 lines
- Introduced user-defined names of output files and random seeds number.
Users can do it use options of PamVMCApplication constructor:
PamVMCApplication(const char* name,  const char *title, const char*
filename="pamtest", Int_t seed=0).
The Random object that I use is TRandom3 object which has astronomical
large period (in case of default initialization 0). All random generators
in the code use this object by calling of gRandom singleton which keeps
it.

- Corrected TOF digitization routine. No problems with TDC hits due to
hadronic interactions anymore.

- Some small changes was done to compile code under Root 5.23. +
geant4_vmc v. 2.6 without any warnings

- Some classes of PamG4RunConfiguartion was changed for geant4_vmc v.
2.6.Some obsolete classes was deleted as soon as developers implemented
regions.

- Navigation was changed from "geomRootToGeant4" to "geomRoot", because on
VMC web page written that as soon as Geant4 has no option ONLY/MANY
translation of overlapped geometry to Geant4 through VGM could be wrong.
I'd like to stay with Root navigation:
http://root.cern.ch/root/vmc/Geant4VMC.html. This should be default
option.

- New Tracker digitization routine written by Sergio was implemented

- PamVMC again became compatible with geant4_vmc v.2.5 and ROOT 5.20.
 The problem was that ROOT developers introduced in TVirtualMC class a new
method SetMagField and new base class:TVirtualMagField from which
user-defined classes shoukd be derived

1 #include "PamVMCS4Dig.h"
2 #include <TRandom.h>
3
4 ClassImp(PamVMCS4Dig)
5
6 void PamVMCS4Dig::Digitize(){
7
8 cout<<"Starting S4 Digitization...."<<endl;
9
10 //This is simple approximation, reflection + atennuation..
11 //I hope in future we will use for generation and propagation of
12 //optical photons abilitiees of montecarlo...
13
14
15
16
17 Int_t DEBUG=1;
18 // creato: S. Borisov, INFN Roma2 e MEPHI, Sett 2007
19 Int_t i,j,t,NdF,pmt,S4;
20 Float_t E0,X,Y,Z,x,y,z,V[3],q,w,l;
21
22 const Float_t Xs[2] = {-24.1, 24.1};
23 const Float_t Ys[2] = {-24.1, 24.1};
24 const Float_t Zs[2] = {-0.5, 0.5};
25 const Float_t Yp[6] = {-20., -17., -1., 2., 17., 20.}; //PMT positions
26
27 const Float_t E1 = 1e-6; //Energy which we spend to produce 1 photon
28 const Float_t p = 0.1;
29 const Int_t l0 = 500;
30
31 const Int_t S4p = 32; //pedestal
32
33 UShort_t S4v = 0; // ADC count
34
35 Int_t NdFT = 0;
36
37 Float_t Ert = 0.;
38
39 TClonesArray * hc = (TClonesArray*)fhitscolmap.GetValue("S4");
40 PamVMCDetectorHit * hit = 0;
41
42 if(hc){
43 for(i=0;i<hc->GetEntriesFast();i++){
44
45 hit = (PamVMCDetectorHit*)hc->At(i);
46
47 Ert += hit->GetEREL();
48 NdF=Int_t(hit->GetEREL()/E1);
49 NdFT=0;
50 X=hit->GetXIN();
51 Y=hit->GetYIN();
52 Z=(Float_t)(random())/(Float_t)(0x7fffffff)-0.5;
53 for(j=0;j<NdF;j++){
54 q=(Float_t)random()/(Float_t)0x7fffffff;
55 w=(Float_t)random()/(Float_t)0x7fffffff;
56 V[0]=p*cos(6.28318*q);
57 V[1]=p*sin(6.28318*q);
58 V[2]=p*(2.*w-1.);
59 pmt=0;
60 x=X;
61 y=Y;
62 z=Z;
63 while(pmt==0 && (x>Xs[0] && x<Xs[1])&&(y>Ys[0] && y<Ys[1])&&(z>Zs[0] && z<Zs[1])){
64 l=0;
65 while(pmt==0 && (x>Xs[0] && x<Xs[1])&&(y>Ys[0] && y<Ys[1])&&(z>Zs[0] && z<Zs[1])){
66 x+=V[0];
67 y+=V[1];
68 z+=V[2];
69 l+=p;
70 }
71 if((x<Xs[0]+p || x>Xs[1]-p)&&(y>Ys[0]+p && y<Ys[1]-p)&&(z>Zs[0]+p && z<Zs[1]-p)){
72 for(t=0;t<3;t++){
73 if(y>=Yp[2*t] && y<Yp[2*t+1]){
74 if(pmt==0)NdFT++;
75 pmt=1;
76 break;
77 }
78 }
79 if(pmt==1)break;
80 V[0]=-V[0];
81 }
82 q=(Float_t)random()/(Float_t)0x7fffffff;
83 w=1-exp(-l/l0);
84 if(q<w)break;
85 q=(Float_t)random()/(Float_t)0x7fffffff;
86 w=0.5;
87 if(q<w)break;
88 if((x>Xs[0]+p && x<Xs[1]-p)&&(y<Ys[0]+p || y>Ys[1]-p)&&(z>Zs[0]+p && z<Zs[1]-p))V[1]=-V[1];
89 if((x>Xs[0]+p && x<Xs[1]-p)&&(y>Ys[0]+p && y<Ys[1]-p)&&(z<Zs[0]+p || z>Zs[1]-p))V[2]=-V[2];
90 x+=V[0];
91 y+=V[1];
92 z+=V[2];
93 l=0;
94 }
95 }
96 }
97 Ert=Ert/0.002;
98 q=(Float_t)(random())/(Float_t)0x7fffffff;
99 w=0.7;
100 E0=4064./7.;
101 if(Ert<1) S4=0;
102 else S4=(Int_t)(4064.*(1.-exp(-(Ert-1.)/E0)));
103 i=S4/4;
104 if(S4%4==0)
105 S4v=S4+S4p;
106 else if(S4%4==1){
107 if(q<w) S4v=S4-1+S4p;
108 else S4v=S4+1+S4p;
109 } else if(S4%4==2) S4v=S4+S4p;
110 else if(S4%4==3){
111 if(q<w) S4v=S4+1+S4p;
112 else S4v=S4-1+S4p;
113 }
114 if (DEBUG)
115 cout<<"Ert_S4 = " << Ert << " --- S4v = " << S4v << endl;
116
117 fData.clear();
118
119 fData.push_back(S4v);
120 fData.push_back(0xd800);
121 fData.push_back(0x0300);
122 }
123 }

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