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ca142b1f | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | // | |
17 | /////////////////////////////////////////////////////////////////////////////// | |
18 | // // | |
19 | // Laser for the TPChamber version 2 -- detailed TPC and slow simulation // | |
20 | // // | |
21 | /////////////////////////////////////////////////////////////////////////////// | |
22 | ||
ca142b1f | 23 | #include <TLorentzVector.h> |
ca142b1f | 24 | #include "AliMC.h" |
d242f3ba | 25 | |
26 | ||
ca142b1f | 27 | #include "AliTPCLaser.h" |
28 | ||
d242f3ba | 29 | |
ca142b1f | 30 | ClassImp(AliTPCLaser) |
31 | ||
32 | //_____________________________________________________________________________ | |
33 | AliTPCLaser::AliTPCLaser(const char *name, const char *title) : | |
d242f3ba | 34 | AliTPCv2(name, title), |
35 | fNelPerCollision(10), | |
36 | fLaserPID(13), // muons | |
37 | fCollisionsPerCm(20) | |
ca142b1f | 38 | { |
d242f3ba | 39 | |
ca142b1f | 40 | } |
41 | //______________________________________________________________ | |
42 | void AliTPCLaser::StepManager() | |
43 | { | |
d242f3ba | 44 | // laser tracks are particles with PID fLaserPID (default PID=13) |
45 | // stopped in the the TPC inner containment vessel (14) | |
46 | ||
47 | if (gMC->TrackPid() != fLaserPID) { | |
48 | // in this way we can prevent delta-electrons | |
49 | gMC->StopTrack(); | |
50 | return; | |
51 | } | |
52 | ||
53 | Int_t copy; | |
54 | Int_t vol[2]; | |
55 | vol[0] = gMC->CurrentVolID(copy); | |
56 | ||
57 | if (gMC->TrackPid() == fLaserPID | |
58 | && vol[0] == 14) {// 14 = TIIN (inner containment vessel) | |
59 | gMC->StopTrack(); | |
60 | return; | |
61 | } | |
62 | ||
63 | TLorentzVector p; | |
64 | Float_t hits[5]={0,0,0,0,0}; | |
65 | gMC->TrackPosition(p); | |
66 | hits[0]=p[0]; | |
67 | hits[1]=p[1]; | |
68 | hits[2]=p[2]; | |
69 | hits[3]=fNelPerCollision; | |
70 | hits[4]=gMC->TrackTime(); | |
ca142b1f | 71 | |
d242f3ba | 72 | Int_t index[3]; |
73 | vol[0]=fTPCParam->Transform0to1(hits,index); | |
74 | AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits); | |
75 | ||
76 | Double_t rnd = gMC->GetRandom()->Rndm(); | |
77 | gMC->SetMaxStep(-TMath::Log(rnd)/fCollisionsPerCm); | |
ca142b1f | 78 | } |