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c5ca52b2 | 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 | ||
acd84897 | 16 | /* $Id$ */ |
c5ca52b2 | 17 | |
116cbefd | 18 | //------------------------------------------------------------------------ |
116cbefd | 19 | // Lego generator in Eta bins |
5d8718b8 | 20 | // Uses geantino rays to check the material distributions and detector's |
21 | // geometry | |
22 | // Author: A.Morsch | |
116cbefd | 23 | //------------------------------------------------------------------------ |
24 | ||
c5ca52b2 | 25 | #include "AliLegoGeneratorEta.h" |
26 | #include "AliRun.h" | |
5d12ce38 | 27 | #include "AliMC.h" |
21bf7095 | 28 | #include "AliLog.h" |
c5ca52b2 | 29 | |
30 | ClassImp(AliLegoGeneratorEta) | |
31 | ||
32 | ||
33 | //___________________________________________ | |
34 | void AliLegoGeneratorEta::Generate() | |
35 | { | |
36 | // Create a geantino with kinematics corresponding to the current bins | |
37 | // Here: Coor1 = eta | |
38 | // Coor2 = phi. | |
39 | ||
40 | // | |
41 | // Rootinos are 0 | |
42 | const Int_t kMpart = 0; | |
43 | Float_t orig[3], pmom[3]; | |
44 | Float_t t, cost, sint, cosp, sinp; | |
45 | if (fCoor1Bin==-1) fCoor1Bin=fNCoor1; | |
46 | // Prepare for next step | |
47 | if(fCoor1Bin>=fNCoor1-1) | |
48 | if(fCoor2Bin>=fNCoor2-1) { | |
21bf7095 | 49 | AliWarning("End of Lego Generation"); |
c5ca52b2 | 50 | return; |
51 | } else { | |
52 | fCoor2Bin++; | |
21bf7095 | 53 | AliDebug(1, Form("Generating rays in eta bin:%d",fCoor2Bin)); |
c5ca52b2 | 54 | fCoor1Bin=0; |
55 | } else fCoor1Bin++; | |
56 | ||
57 | fCurCoor1 = (fCoor1Min+(fCoor1Bin+0.5)*(fCoor1Max-fCoor1Min)/fNCoor1); | |
58 | fCurCoor2 = (fCoor2Min+(fCoor2Bin+0.5)*(fCoor2Max-fCoor2Min)/fNCoor2); | |
59 | ||
10bd7535 | 60 | Float_t phi = fCurCoor1*TMath::Pi()/180.; |
61 | Float_t theta = 2.*TMath::ATan(TMath::Exp(-fCurCoor2)); | |
62 | ||
c5ca52b2 | 63 | |
64 | cost = TMath::Cos(theta); | |
65 | sint = TMath::Sin(theta); | |
66 | cosp = TMath::Cos(phi); | |
67 | sinp = TMath::Sin(phi); | |
68 | ||
69 | pmom[0] = cosp*sint; | |
70 | pmom[1] = sinp*sint; | |
71 | pmom[2] = cost; | |
72 | ||
73 | // --- Where to start | |
74 | orig[0] = orig[1] = orig[2] = 0; | |
75 | Float_t dalicz = 3000; | |
76 | if (fRadMin > 0) { | |
77 | t = PropagateCylinder(orig,pmom,fRadMin,dalicz); | |
78 | orig[0] = pmom[0]*t; | |
79 | orig[1] = pmom[1]*t; | |
80 | orig[2] = pmom[2]*t; | |
81 | if (TMath::Abs(orig[2]) > fZMax) return; | |
82 | } | |
83 | ||
84 | Float_t polar[3]={0.,0.,0.}; | |
85 | Int_t ntr; | |
5d12ce38 | 86 | gAlice->GetMCApp()->PushTrack(1, -1, kMpart, pmom, orig, polar, 0, kPPrimary, ntr); |
c5ca52b2 | 87 | |
88 | } |