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 // Segmentation and Response classes version 04 //
20 /////////////////////////////////////////////////////
23 #include "AliMUONSegmentationV04.h"
24 #include "AliMUONChamber.h"
30 //___________________________________________
31 ClassImp(AliMUONSegmentationV04)
34 void AliMUONSegmentationV04::Init(Int_t chamber)
38 // Fill the arrays fCx (x-contour) and fNpxS (ix-contour) for each sector
39 // These arrays help in converting from real to pad co-ordinates and
42 // Segmentation is defined by rectangular modules approximating
43 // concentric circles as shown below
45 // PCB module size in cm
46 //printf("\n Initialise Segmentation V04 \n");
48 const Float_t kDxPCB=40, kDyPCB=40;
49 // PCB distribution (7 rows with 1+3 segmentation regions)
50 const Int_t kpcb[7][4] = {{1, 2, 2, 2},
62 // 3 3 3 2 2 | 2 2 3 3 3
63 // 3 3 3 2 2 2 | 2 2 2 3 3 3
64 // 3 3 2 2 1 1 | 1 1 2 2 3 3
65 // 3 3 2 2 1 1 1 | 1 1 1 2 2 3 3
66 // 3 3 2 2 1 1 0 | 0 1 1 2 2 3 3
67 // ------------------------------
68 // 3 3 2 2 1 1 0 | 0 1 1 2 2 3 3
69 // 3 3 2 2 1 1 1 | 1 1 1 2 2 3 3
70 // 3 3 2 2 1 1 | 1 1 2 2 3 3
71 // 3 3 3 2 2 2 | 2 2 2 3 3 3
72 // 3 3 3 2 2 | 2 2 3 3 3
76 // number of pad rows per PCB
78 Int_t nPyPCB=Int_t(kDyPCB/fDpy);
80 // maximum number of pad rows
83 // Calculate padsize along x
84 (*fDpxD)[fNsec-1]=fDpx;
86 for (Int_t i=fNsec-2; i>=0; i--){
87 (*fDpxD)[i]=(*fDpxD)[fNsec-1]/(*fNDiv)[i];
91 // fill the arrays defining the pad segmentation boundaries
93 // loop over pcb module rows
95 for (Int_t irow=0; irow<7; irow++) {
97 // loop over pads along the anode wires
98 for (Int_t i=0; i<=nPyPCB; i++) {
99 // iy counts the padrow
101 // Loop over sectors (isec=0 is the dead space surounding the beam pipe)
102 for (Int_t isec=0; isec<4; isec++) {
104 fNpxS[0][iy]=kpcb[irow][0]*Int_t(kDxPCB/(*fDpxD)[0]);
105 fCx[0][iy]=kpcb[irow][0]*kDxPCB;
107 fNpxS[isec][iy]=fNpxS[isec-1][iy]
108 +kpcb[irow][isec]*Int_t(kDxPCB/(*fDpxD)[isec]);
110 fCx[isec][iy]=fCx[isec-1][iy]
111 +kpcb[irow][isec]*kDxPCB;
114 } // pad raws in module
117 AliMUON *pMUON = (AliMUON *) gAlice->GetModule("MUON");
118 fChamber=&(pMUON->Chamber(chamber));
122 void AliMUONSegmentationV04::GiveTestPoints(Int_t &n, Float_t *x, Float_t *y) const
124 // Returns test point on the pad plane.
125 // Used during determination of the segmoid correction of the COG-method
127 x[0]=(fCx[1][1]+fCx[0][1])/2/TMath::Sqrt(2.);
129 x[1]=(fCx[2][1]+fCx[1][1])/2/TMath::Sqrt(2.);
131 x[2]=(fCx[3][1]+fCx[2][1])/2/TMath::Sqrt(2.);