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df725edf | 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 | ||
88cb7938 | 16 | /* $Id$ */ |
df725edf | 17 | |
675e9664 | 18 | // As AliGenScan, generation of particles on a 3-dim grid |
19 | // but here double hits with a predefined distance are generated. | |
20 | // The second particle is generated at a constant distance but with random phi. | |
21 | // Generator can be used to evaluate double hit resolutions. | |
22 | // Author: andreas.morsch@cern.ch | |
23 | ||
df725edf | 24 | #include "AliGenDoubleScan.h" |
df725edf | 25 | #include "AliRun.h" |
f87cfe57 | 26 | |
df725edf | 27 | ClassImp(AliGenDoubleScan) |
28 | ||
29 | AliGenDoubleScan::AliGenDoubleScan() | |
30 | :AliGenScan(-1) | |
31 | { | |
32 | } | |
33 | ||
34 | AliGenDoubleScan::AliGenDoubleScan(Int_t npart) | |
35 | :AliGenScan(npart) | |
36 | { | |
f87cfe57 | 37 | // Constructor |
8b31bfac | 38 | fName = "Double Scan"; |
39 | fTitle= "Particle Generator for two correlated particles on a grid"; | |
df725edf | 40 | } |
41 | ||
42 | //____________________________________________________________ | |
43 | AliGenDoubleScan::~AliGenDoubleScan() | |
f87cfe57 | 44 | { |
45 | // Destructor | |
46 | } | |
df725edf | 47 | |
48 | //____________________________________________________________ | |
49 | void AliGenDoubleScan::Generate() | |
50 | { | |
f87cfe57 | 51 | // |
52 | // Generate one trigger | |
53 | // | |
df725edf | 54 | |
f87cfe57 | 55 | Float_t polar[3]= {0,0,0}; |
56 | // | |
57 | Float_t origin[3]; | |
58 | Float_t p[3]; | |
59 | Int_t nt; | |
60 | Float_t pmom, theta, phi; | |
61 | // | |
62 | Float_t random[6]; | |
63 | Float_t dx,dy,dz; | |
64 | ||
65 | // | |
833149de | 66 | if (fNx > 0) { |
38f1bd58 | 67 | dx=(fXCmax-fXCmin)/fNx; |
f87cfe57 | 68 | } else { |
69 | dx=1e10; | |
70 | } | |
df725edf | 71 | |
f87cfe57 | 72 | if (fNy > 0) { |
38f1bd58 | 73 | dy=(fYCmax-fYCmin)/fNy; |
f87cfe57 | 74 | } else { |
75 | dy=1e10; | |
76 | } | |
77 | ||
78 | if (fNz > 0) { | |
df725edf | 79 | dz=(fZmax-fZmin)/fNz; |
f87cfe57 | 80 | } else { |
81 | dz=1e10; | |
82 | } | |
83 | for (Int_t ix=0; ix<fNx; ix++) { | |
df725edf | 84 | for (Int_t iy=0; iy<fNy; iy++) { |
85 | for (Int_t iz=0; iz<fNz; iz++){ | |
65fb704d | 86 | Rndm(random,6); |
38f1bd58 | 87 | origin[0]=fXCmin+ix*dx+2*(random[0]-0.5)*fOsigma[0]; |
88 | origin[1]=fYCmin+iy*dy+2*(random[1]-0.5)*fOsigma[1]; | |
df725edf | 89 | origin[2]=fZmin+iz*dz+2*(random[2]-0.5)*fOsigma[2]; |
90 | pmom=fPMin+random[3]*(fPMax-fPMin); | |
91 | theta=fThetaMin+random[4]*(fThetaMax-fThetaMin); | |
92 | phi=fPhiMin+random[5]*(fPhiMax-fPhiMin); | |
93 | p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta); | |
94 | p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta); | |
95 | p[2] = pmom*TMath::Cos(theta); | |
642f15cf | 96 | PushTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt); |
df725edf | 97 | // |
98 | // Generate 2nd particle at distance fDistance from the first | |
99 | // | |
65fb704d | 100 | Rndm(random,6); |
df725edf | 101 | Float_t phi2=2.*TMath::Pi()*random[0]; |
102 | Float_t dx =fDistance*TMath::Sin(phi2); | |
103 | Float_t dy =fDistance*TMath::Cos(phi2); | |
104 | origin[0]=origin[0]+dx; | |
105 | origin[1]=origin[1]+dy; | |
106 | pmom=fPMin+random[1]*(fPMax-fPMin); | |
107 | theta=fThetaMin+random[2]*(fThetaMax-fThetaMin); | |
108 | phi=fPhiMin+random[3]*(fPhiMax-fPhiMin); | |
109 | p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta); | |
110 | p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta); | |
111 | p[2] = pmom*TMath::Cos(theta); | |
642f15cf | 112 | PushTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt); |
df725edf | 113 | } |
114 | } | |
115 | } | |
116 | } | |
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