1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 // -----------------------
19 // Class AliMUONChamber
20 // -----------------------
21 // MUON tracking chamber class
22 // now only providing DisIntegration function
24 // --- ROOT includes ---
30 // --- MUON includes ---
32 #include "AliMUONChamber.h"
33 #include "AliMUONSegmentation.h"
34 #include "AliMUONHit.h"
38 ClassImp(AliMUONChamber)
41 //_______________________________________________________
42 AliMUONChamber::AliMUONChamber()
45 fCurrentCorrel(1), // to avoid mistakes if ChargeCorrelInit is not called
49 /// Default constructor
51 AliDebug(1, Form("default (empty) ctor this = %p", this));
54 //_______________________________________________________
55 AliMUONChamber::AliMUONChamber(Int_t id)
58 fCurrentCorrel(1), // to avoid mistakes if ChargeCorrelInit is not called
62 /// Standard constructor
65 fMUON = (AliMUON*)gAlice->GetModule("MUON");
67 AliFatal("MUON detector not defined.");
71 AliDebug(1, Form("ctor this = %p", this) );
74 //_______________________________________________________
75 AliMUONChamber::~AliMUONChamber()
79 AliDebug(1, Form("dtor this = %p", this));
82 //_____________________________________________________
83 void AliMUONChamber::ChargeCorrelationInit()
85 /// Initialisation of charge correlation for current hit
86 /// the value is stored, and then used by Disintegration
88 // exponential is here to avoid eventual problems in 0
89 // factor 2 because chargecorrel is q1/q2 and not q1/qtrue
90 fCurrentCorrel = TMath::Exp(gRandom->Gaus(0,fResponse->ChargeCorrel()/2));
93 //_______________________________________________________
94 void AliMUONChamber::DisIntegration(AliMUONHit *hit,
95 Int_t& nnew,Float_t newclust[6][500])
97 /// Generates pad hits (simulated cluster)
98 /// using the segmentation and the response model
102 Float_t xhit = hit->X();
103 Float_t yhit = hit->Y();
104 Float_t zhit = hit->Z();
105 Int_t id = hit->DetElemId();
106 Float_t eloss = hit->Eloss();
109 // Width of the integration area
111 dx=fResponse->SigmaIntegration()*fResponse->ChargeSpreadX();
112 dy=fResponse->SigmaIntegration()*fResponse->ChargeSpreadY();
114 // Get pulse height from energy loss
115 Float_t qtot = fResponse->IntPH(eloss);
122 // Cathode plane loop
123 for (Int_t i = 1; i <= 2; i++) {
124 Float_t qcath = qtot * (i==1? fCurrentCorrel : 1/fCurrentCorrel);
126 AliMUONGeometrySegmentation* segmentation=
127 fMUON->GetSegmentation()->GetModuleSegmentationByDEId(id, i-1);
129 for (segmentation->FirstPad(id, xhit, yhit, zhit, dx, dy);
130 segmentation->MorePads(id);
131 segmentation->NextPad(id))
133 qp=fResponse->IntXY(id, segmentation);
139 if (nnew >= 500) // Perform a bounds check on nnew since it is assumed
140 // newclust only contains 500 elements.
142 AliError("Limit of 500 pad responses reached.");
146 // --- store signal information
147 newclust[0][nnew]=qcath; // total charge
148 newclust[1][nnew]=segmentation->Ix(); // ix-position of pad
149 newclust[2][nnew]=segmentation->Iy(); // iy-position of pad
150 newclust[3][nnew]=qp * qcath; // charge on pad
151 newclust[4][nnew]=segmentation->ISector(); // sector id
152 newclust[5][nnew]=(Float_t) i; // counter
157 } // Cathode plane loop