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022ee144 | 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 | //------------------------------------------------------- | |
17 | // Implementation of the TPC transformation class | |
18 | // | |
19 | // Origin: Marian Ivanov Marian.Ivanov@cern.ch | |
20 | // Magnus Mager | |
21 | // | |
22 | // Class for tranformation of the coordinate frame | |
23 | // Tranformation | |
24 | // local coordinate frame (sector, padrow, pad, timebine) ==> | |
25 | // rotated global (tracking) cooridnate frame (sector, lx,ly,lz) | |
26 | // | |
27 | // Unisochronity - (substract time0 - pad by pad) | |
28 | // Drift velocity - Currently common drift velocity - functionality of AliTPCParam | |
29 | // ExB effect - | |
30 | // | |
31 | // Usage: | |
32 | // AliTPCclustererMI::AddCluster | |
33 | // AliTPCtrackerMI::Transform | |
34 | // | |
35 | //------------------------------------------------------- | |
c1bdda91 | 36 | |
37 | /* To test it: | |
38 | cdb=AliCDBManager::Instance() | |
39 | cdb->SetDefaultStorage("local:///u/mmager/mycalib1") | |
40 | c=AliTPCcalibDB::Instance() | |
41 | c->SetRun(0) | |
42 | Double_t x[]={1.0,2.0,3.0} | |
43 | Int_t i[]={4} | |
44 | AliTPCTransform trafo | |
45 | trafo.Transform(x,i,0,1) | |
46 | */ | |
47 | ||
022ee144 | 48 | /* $Id$ */ |
49 | ||
50 | #include "AliTPCROC.h" | |
51 | #include "AliTPCCalPad.h" | |
52 | #include "AliTPCCalROC.h" | |
53 | #include "AliTPCcalibDB.h" | |
54 | #include "AliTPCParam.h" | |
55 | #include "TMath.h" | |
56 | #include "AliLog.h" | |
57 | #include "AliTPCExB.h" | |
58 | #include "AliTPCTransform.h" | |
59 | ||
60 | ||
61 | ||
c1bdda91 | 62 | AliTPCTransform::AliTPCTransform() { |
24db6af7 | 63 | // |
c1bdda91 | 64 | // Speed it up a bit! |
24db6af7 | 65 | // |
c1bdda91 | 66 | for (Int_t i=0;i<18;++i) { |
67 | Double_t alpha=TMath::DegToRad()*(10.+20.*(i%18)); | |
68 | fSins[i]=TMath::Sin(alpha); | |
69 | fCoss[i]=TMath::Cos(alpha); | |
70 | } | |
71 | } | |
72 | ||
73 | AliTPCTransform::~AliTPCTransform() { | |
24db6af7 | 74 | // |
75 | // Destructor | |
76 | // | |
c1bdda91 | 77 | } |
78 | ||
24db6af7 | 79 | void AliTPCTransform::Transform(Double_t *x,Int_t *i,UInt_t /*time*/, |
80 | Int_t /*coordinateType*/) { | |
81 | // input: x[0] - pad row | |
82 | // x[1] - pad | |
c1bdda91 | 83 | // x[2] - time in us |
84 | // i[0] - sector | |
85 | // output: x[0] - x (all in the rotated global coordinate frame) | |
86 | // x[1] - y | |
87 | // x[2] - z | |
24db6af7 | 88 | Int_t row=TMath::Nint(x[0]); |
89 | Int_t pad=TMath::Nint(x[1]); | |
c1bdda91 | 90 | Int_t sector=i[0]; |
91 | AliTPCcalibDB* const calib=AliTPCcalibDB::Instance(); | |
24db6af7 | 92 | // |
93 | AliTPCCalPad * time0TPC = calib->GetPadTime0(); | |
94 | AliTPCParam * param = calib->GetParameters(); | |
95 | if (!time0TPC){ | |
96 | AliFatal("Time unisochronity missing"); | |
97 | } | |
c1bdda91 | 98 | |
24db6af7 | 99 | if (!param){ |
100 | AliFatal("Parameters missing"); | |
101 | } | |
c1bdda91 | 102 | |
24db6af7 | 103 | Double_t xx[3]; |
104 | // Apply Time0 correction - Pad by pad fluctuation | |
105 | // | |
106 | x[2]-=time0TPC->GetCalROC(sector)->GetValue(row,pad); | |
107 | // | |
108 | // Tranform from pad - time coordinate system to the rotated global (tracking) system | |
109 | // | |
110 | Local2RotatedGlobal(sector,x); | |
111 | // | |
112 | // | |
113 | // | |
c1bdda91 | 114 | // Alignment |
115 | //TODO: calib->GetParameters()->GetClusterMatrix(sector)->LocalToMaster(x,xx); | |
c1bdda91 | 116 | RotatedGlobal2Global(sector,x); |
24db6af7 | 117 | // |
118 | // | |
119 | // ExB correction | |
120 | // | |
c1bdda91 | 121 | calib->GetExB()->Correct(x,xx); |
122 | ||
123 | Global2RotatedGlobal(sector,xx); | |
124 | ||
125 | x[0]=xx[0];x[1]=xx[1];x[2]=xx[2]; | |
126 | } | |
127 | ||
24db6af7 | 128 | void AliTPCTransform::Local2RotatedGlobal(Int_t sector, Double_t *x) const { |
129 | // | |
130 | // | |
022ee144 | 131 | // Tranform coordinate from |
132 | // row, pad, time to x,y,z | |
24db6af7 | 133 | // |
022ee144 | 134 | // Drift Velocity |
135 | // Current implementation - common drift velocity - for full chamber | |
24db6af7 | 136 | // TODO: use a map or parametrisation! |
137 | // | |
138 | // | |
139 | // | |
140 | AliTPCcalibDB* const calib=AliTPCcalibDB::Instance(); | |
141 | AliTPCParam * param = calib->GetParameters(); | |
142 | if (!param){ | |
143 | AliFatal("Parameters missing"); | |
144 | } | |
145 | Int_t row=TMath::Nint(x[0]); | |
146 | Int_t pad=TMath::Nint(x[1]); | |
147 | // | |
148 | const Int_t kNIS=param->GetNInnerSector(), kNOS=param->GetNOuterSector(); | |
149 | Double_t sign = 1.; | |
150 | Double_t zwidth = param->GetZWidth(); | |
151 | Double_t padWidth = 0; | |
152 | Double_t padLength = 0; | |
153 | Double_t maxPad = 0; | |
154 | // | |
155 | if (sector < kNIS) { | |
156 | maxPad = param->GetNPadsLow(row); | |
157 | sign = (sector < kNIS/2) ? 1 : -1; | |
158 | padLength = param->GetPadPitchLength(sector,row); | |
159 | padWidth = param->GetPadPitchWidth(sector); | |
160 | } else { | |
161 | maxPad = param->GetNPadsUp(row); | |
162 | sign = ((sector-kNIS) < kNOS/2) ? 1 : -1; | |
163 | padLength = param->GetPadPitchLength(sector,row); | |
164 | padWidth = param->GetPadPitchWidth(sector); | |
165 | } | |
166 | // | |
167 | // X coordinate | |
022ee144 | 168 | x[0] = param->GetPadRowRadii(sector,row); // padrow X position - ideal |
24db6af7 | 169 | // |
170 | // Y coordinate | |
171 | // | |
172 | x[1]=(x[1]-0.5*maxPad)*padWidth; | |
24db6af7 | 173 | // |
174 | // Z coordinate | |
175 | // | |
176 | x[2]*= zwidth; // tranform time bin to the distance to the ROC | |
177 | x[2]-= 3.*param->GetZSigma() + param->GetNTBinsL1()*zwidth; | |
178 | // subtract the time offsets | |
179 | x[2] = sign*( param->GetZLength(sector) - x[2]); | |
c1bdda91 | 180 | } |
181 | ||
24db6af7 | 182 | inline void AliTPCTransform::RotatedGlobal2Global(Int_t sector,Double_t *x) const { |
183 | // | |
184 | // transform possition rotated global to the global | |
185 | // | |
c1bdda91 | 186 | Double_t cos,sin; |
187 | GetCosAndSin(sector,cos,sin); | |
188 | Double_t tmp=x[0]; | |
189 | x[0]= cos*tmp+sin*x[1]; | |
190 | x[1]=-sin*tmp+cos*x[1]; | |
191 | } | |
192 | ||
24db6af7 | 193 | inline void AliTPCTransform::Global2RotatedGlobal(Int_t sector,Double_t *x) const { |
194 | // | |
195 | // tranform possition Global2RotatedGlobal | |
196 | // | |
c1bdda91 | 197 | Double_t cos,sin; |
198 | GetCosAndSin(sector,cos,sin); | |
199 | Double_t tmp=x[0]; | |
200 | x[0]= cos*tmp-sin*x[1]; | |
201 | x[1]= sin*tmp+cos*x[1]; | |
202 | } | |
203 | ||
204 | inline void AliTPCTransform::GetCosAndSin(Int_t sector,Double_t &cos, | |
205 | Double_t &sin) const { | |
206 | cos=fCoss[sector%18]; | |
207 | sin=fSins[sector%18]; | |
208 | } | |
209 | ||
210 | ClassImp(AliTPCTransform) | |
211 |