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37e5988f | 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 | /* $Id $ */ | |
17 | ||
18 | //------------------------------------------------------------------------ | |
19 | // Lego generator in Eta bins | |
20 | // Uses geantino rays to check the material distributions and detector's | |
21 | // geometry | |
22 | // Author: A.Morsch | |
23 | //------------------------------------------------------------------------ | |
24 | ||
25 | #include "TRandom.h" | |
26 | ||
27 | #include "AliLegoGeneratorEtaR.h" | |
28 | #include "AliRun.h" | |
29 | #include "AliMC.h" | |
30 | #include "AliLog.h" | |
31 | ||
32 | ClassImp(AliLegoGeneratorEtaR) | |
33 | ||
34 | ||
35 | //___________________________________________ | |
36 | void AliLegoGeneratorEtaR::Generate() | |
37 | { | |
38 | // Create a geantino with kinematics corresponding to the current bins | |
39 | // Here: Coor1 = phi | |
40 | // Coor2 = eta. | |
41 | ||
42 | // | |
43 | // Rootinos are 0 | |
44 | const Int_t kMpart = 0; | |
45 | Float_t orig[3], pmom[3]; | |
46 | Float_t t, cost, sint, cosp, sinp; | |
47 | fCurCoor1 = fCoor1Min + (fCoor1Max - fCoor1Min) * gRandom->Rndm(); | |
48 | fCurCoor2 = fCoor2Min + (fCoor2Max - fCoor2Min) * gRandom->Rndm(); | |
49 | ||
50 | Float_t phi = fCurCoor1 * TMath::Pi() / 180.; | |
51 | Float_t theta = 2. * TMath::ATan(TMath::Exp(-fCurCoor2)); | |
52 | ||
53 | ||
54 | cost = TMath::Cos(theta); | |
55 | sint = TMath::Sin(theta); | |
56 | cosp = TMath::Cos(phi); | |
57 | sinp = TMath::Sin(phi); | |
58 | ||
59 | pmom[0] = cosp * sint; | |
60 | pmom[1] = sinp * sint; | |
61 | pmom[2] = cost; | |
62 | ||
63 | // --- Where to start | |
64 | orig[0] = orig[1] = orig[2] = 0; | |
65 | Float_t dalicz = 3000; | |
66 | if (fRadMin > 0) { | |
67 | t = PropagateCylinder(orig, pmom, fRadMin, dalicz); | |
68 | orig[0] = pmom[0]*t; | |
69 | orig[1] = pmom[1]*t; | |
70 | orig[2] = pmom[2]*t; | |
71 | if (TMath::Abs(orig[2]) > fZMax) return; | |
72 | } | |
73 | ||
74 | Float_t polar[3]={0.,0.,0.}; | |
75 | Int_t ntr; | |
76 | gAlice->GetMCApp()->PushTrack(1, -1, kMpart, pmom, orig, polar, 0, kPPrimary, ntr); | |
77 | ||
78 | } |