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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
66954e3f 23// Transformation
022ee144 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//
003b43ed 31// Time of flight correction -
32// - Depends on the vertex position
33// - by default
34//
022ee144 35// Usage:
36// AliTPCclustererMI::AddCluster
37// AliTPCtrackerMI::Transform
38//
39//-------------------------------------------------------
c1bdda91 40
41/* To test it:
42 cdb=AliCDBManager::Instance()
43 cdb->SetDefaultStorage("local:///u/mmager/mycalib1")
44 c=AliTPCcalibDB::Instance()
45 c->SetRun(0)
46 Double_t x[]={1.0,2.0,3.0}
47 Int_t i[]={4}
48 AliTPCTransform trafo
49 trafo.Transform(x,i,0,1)
50 */
51
022ee144 52/* $Id$ */
53
54#include "AliTPCROC.h"
55#include "AliTPCCalPad.h"
56#include "AliTPCCalROC.h"
57#include "AliTPCcalibDB.h"
58#include "AliTPCParam.h"
59#include "TMath.h"
60#include "AliLog.h"
61#include "AliTPCExB.h"
66954e3f 62#include "TGeoMatrix.h"
9430b11a 63#include "AliTPCRecoParam.h"
64#include "AliTPCCalibVdrift.h"
022ee144 65#include "AliTPCTransform.h"
1e6337b1 66#include <AliCTPTimeParams.h>
022ee144 67
66954e3f 68ClassImp(AliTPCTransform)
022ee144 69
70
9430b11a 71AliTPCTransform::AliTPCTransform():
72 AliTransform(),
73 fCurrentRecoParam(0), //! current reconstruction parameters
74 fCurrentRun(0), //! current run
75 fCurrentTimeStamp(0) //! current time stamp
76{
77 //
78 // Speed it up a bit!
79 //
80 for (Int_t i=0;i<18;++i) {
81 Double_t alpha=TMath::DegToRad()*(10.+20.*(i%18));
82 fSins[i]=TMath::Sin(alpha);
83 fCoss[i]=TMath::Cos(alpha);
84 }
85 fPrimVtx[0]=0;
86 fPrimVtx[1]=0;
87 fPrimVtx[2]=0;
88}
89AliTPCTransform::AliTPCTransform(const AliTPCTransform& transform):
90 AliTransform(transform),
91 fCurrentRecoParam(transform.fCurrentRecoParam), //! current reconstruction parameters
92 fCurrentRun(transform.fCurrentRun), //! current run
93 fCurrentTimeStamp(transform.fCurrentTimeStamp) //! current time stamp
003b43ed 94{
24db6af7 95 //
c1bdda91 96 // Speed it up a bit!
24db6af7 97 //
c1bdda91 98 for (Int_t i=0;i<18;++i) {
99 Double_t alpha=TMath::DegToRad()*(10.+20.*(i%18));
100 fSins[i]=TMath::Sin(alpha);
101 fCoss[i]=TMath::Cos(alpha);
102 }
003b43ed 103 fPrimVtx[0]=0;
104 fPrimVtx[1]=0;
105 fPrimVtx[2]=0;
c1bdda91 106}
107
108AliTPCTransform::~AliTPCTransform() {
24db6af7 109 //
110 // Destructor
111 //
c1bdda91 112}
113
003b43ed 114void AliTPCTransform::SetPrimVertex(Double_t *vtx){
115 //
116 //
117 //
118 fPrimVtx[0]=vtx[0];
119 fPrimVtx[1]=vtx[1];
120 fPrimVtx[2]=vtx[2];
121}
122
123
24db6af7 124void AliTPCTransform::Transform(Double_t *x,Int_t *i,UInt_t /*time*/,
003b43ed 125 Int_t /*coordinateType*/) {
24db6af7 126 // input: x[0] - pad row
127 // x[1] - pad
c1bdda91 128 // x[2] - time in us
129 // i[0] - sector
130 // output: x[0] - x (all in the rotated global coordinate frame)
131 // x[1] - y
132 // x[2] - z
ecc5dd8f 133 //
134 // primvtx - position of the primary vertex
135 // used for the TOF correction
136 // TOF of particle calculated assuming the speed-of-light and
137 // line approximation
138 //
139
24db6af7 140 Int_t row=TMath::Nint(x[0]);
141 Int_t pad=TMath::Nint(x[1]);
c1bdda91 142 Int_t sector=i[0];
9430b11a 143 AliTPCcalibDB* calib=AliTPCcalibDB::Instance();
24db6af7 144 //
145 AliTPCCalPad * time0TPC = calib->GetPadTime0();
146 AliTPCParam * param = calib->GetParameters();
147 if (!time0TPC){
148 AliFatal("Time unisochronity missing");
149 }
c1bdda91 150
24db6af7 151 if (!param){
152 AliFatal("Parameters missing");
153 }
c1bdda91 154
24db6af7 155 Double_t xx[3];
156 // Apply Time0 correction - Pad by pad fluctuation
157 //
158 x[2]-=time0TPC->GetCalROC(sector)->GetValue(row,pad);
159 //
160 // Tranform from pad - time coordinate system to the rotated global (tracking) system
161 //
162 Local2RotatedGlobal(sector,x);
163 //
164 //
165 //
c1bdda91 166 // Alignment
167 //TODO: calib->GetParameters()->GetClusterMatrix(sector)->LocalToMaster(x,xx);
c1bdda91 168 RotatedGlobal2Global(sector,x);
24db6af7 169 //
170 //
171 // ExB correction
172 //
3ce45991 173 if(fCurrentRecoParam&&fCurrentRecoParam->GetUseExBCorrection()) {
174
175 calib->GetExB()->Correct(x,xx);
176
177 } else {
178
179 xx[0] = x[0];
180 xx[1] = x[1];
181 xx[2] = x[2];
182 }
183
ecc5dd8f 184 //
185 // Time of flight correction
003b43ed 186 //
9430b11a 187 if (fCurrentRecoParam&&fCurrentRecoParam->GetUseTOFCorrection()){
188 const Int_t kNIS=param->GetNInnerSector(), kNOS=param->GetNOuterSector();
189 Float_t sign=1;
190 if (sector < kNIS) {
191 sign = (sector < kNIS/2) ? 1 : -1;
192 } else {
193 sign = ((sector-kNIS) < kNOS/2) ? 1 : -1;
194 }
195 Float_t deltaDr =0;
196 Float_t dist=0;
197 dist+=(fPrimVtx[0]-x[0])*(fPrimVtx[0]-x[0]);
198 dist+=(fPrimVtx[1]-x[1])*(fPrimVtx[1]-x[1]);
199 dist+=(fPrimVtx[2]-x[2])*(fPrimVtx[2]-x[2]);
200 dist = TMath::Sqrt(dist);
201 // drift length correction because of TOF
202 // the drift velocity is in cm/s therefore multiplication by 0.01
203 deltaDr = (dist*(0.01*param->GetDriftV()))/TMath::C();
204 xx[2]+=sign*deltaDr;
ecc5dd8f 205 }
9430b11a 206 //
207 //
208 //
209
ecc5dd8f 210 //
c1bdda91 211 Global2RotatedGlobal(sector,xx);
003b43ed 212 //
c1bdda91 213 x[0]=xx[0];x[1]=xx[1];x[2]=xx[2];
214}
215
24db6af7 216void AliTPCTransform::Local2RotatedGlobal(Int_t sector, Double_t *x) const {
217 //
218 //
022ee144 219 // Tranform coordinate from
220 // row, pad, time to x,y,z
24db6af7 221 //
022ee144 222 // Drift Velocity
223 // Current implementation - common drift velocity - for full chamber
24db6af7 224 // TODO: use a map or parametrisation!
225 //
226 //
227 //
9430b11a 228 const Int_t kMax =60; // cache for 60 seconds
229 static Int_t lastStamp=-1; //cached values
230 static Double_t lastCorr = 1;
231 //
66954e3f 232 AliTPCcalibDB* calib=AliTPCcalibDB::Instance();
24db6af7 233 AliTPCParam * param = calib->GetParameters();
9430b11a 234 AliTPCCalibVdrift *driftCalib = AliTPCcalibDB::Instance()->GetVdrift(fCurrentRun);
235 Double_t driftCorr = 1.;
236 if (driftCalib){
237 //
238 // caching drift correction - temp. fix
239 // Extremally slow procedure
240 if ( TMath::Abs((lastStamp)-Int_t(fCurrentTimeStamp))<kMax){
241 driftCorr = lastCorr;
242 }else{
243 driftCorr = 1.+(driftCalib->GetPTRelative(fCurrentTimeStamp,0)+ driftCalib->GetPTRelative(fCurrentTimeStamp,1))*0.5;
244 lastCorr=driftCorr;
245 lastStamp=fCurrentTimeStamp;
246
247 }
248 }
43a74775 249 //
a8f8b6a1 250 // simple caching non thread save
251 static Double_t vdcorrectionTime=1;
252 static Double_t time0corrTime=0;
253 static Int_t lastStampT=-1;
254 //
817766d5 255 if (lastStampT!=(Int_t)fCurrentTimeStamp){
a8f8b6a1 256 lastStampT=fCurrentTimeStamp;
257 if(fCurrentRecoParam&&fCurrentRecoParam->GetUseDriftCorrectionTime()>0) {
258 vdcorrectionTime = (1+AliTPCcalibDB::Instance()->
259 GetVDriftCorrectionTime(fCurrentTimeStamp,
fefec90f 260 fCurrentRun,
a8f8b6a1 261 sector%36>=18,
262 fCurrentRecoParam->GetUseDriftCorrectionTime()));
263 time0corrTime= AliTPCcalibDB::Instance()->
264 GetTime0CorrectionTime(fCurrentTimeStamp,
fefec90f 265 fCurrentRun,
a8f8b6a1 266 sector%36>=18,
267 fCurrentRecoParam->GetUseDriftCorrectionTime());
268 }
269 //
270 if(fCurrentRecoParam&&fCurrentRecoParam->GetUseDriftCorrectionGY()>0) {
271 Float_t xyzPad[3];
272 AliTPCROC::Instance()->GetPositionGlobal(sector, TMath::Nint(x[0]) ,TMath::Nint(x[1]), xyzPad);
273
274 Double_t corrGy= (1+(xyzPad[1])*AliTPCcalibDB::Instance()->
275 GetVDriftCorrectionGy(fCurrentTimeStamp,
276 AliTPCcalibDB::Instance()->GetRun(),
277 sector%36>=18,
278 fCurrentRecoParam->GetUseDriftCorrectionGY()));
279 vdcorrectionTime *=corrGy;
280 }
43a74775 281 }
9430b11a 282
283
24db6af7 284 if (!param){
285 AliFatal("Parameters missing");
286 }
287 Int_t row=TMath::Nint(x[0]);
9389f9a4 288 // Int_t pad=TMath::Nint(x[1]);
24db6af7 289 //
290 const Int_t kNIS=param->GetNInnerSector(), kNOS=param->GetNOuterSector();
291 Double_t sign = 1.;
43a74775 292 Double_t zwidth = param->GetZWidth()*driftCorr*vdcorrectionTime;
24db6af7 293 Double_t padWidth = 0;
294 Double_t padLength = 0;
295 Double_t maxPad = 0;
296 //
297 if (sector < kNIS) {
298 maxPad = param->GetNPadsLow(row);
299 sign = (sector < kNIS/2) ? 1 : -1;
300 padLength = param->GetPadPitchLength(sector,row);
301 padWidth = param->GetPadPitchWidth(sector);
302 } else {
303 maxPad = param->GetNPadsUp(row);
304 sign = ((sector-kNIS) < kNOS/2) ? 1 : -1;
305 padLength = param->GetPadPitchLength(sector,row);
306 padWidth = param->GetPadPitchWidth(sector);
307 }
308 //
309 // X coordinate
022ee144 310 x[0] = param->GetPadRowRadii(sector,row); // padrow X position - ideal
24db6af7 311 //
312 // Y coordinate
313 //
314 x[1]=(x[1]-0.5*maxPad)*padWidth;
afbaa016 315 // pads are mirrorred on C-side
316 if (sector%36>17){
317 x[1]*=-1;
318 }
319
320 //
321
24db6af7 322 //
323 // Z coordinate
324 //
1e6337b1 325 if (AliTPCcalibDB::Instance()->IsTrgL0()){
326 // by defualt we assume L1 trigger is used - make a correction in case of L0
327 AliCTPTimeParams* ctp = AliTPCcalibDB::Instance()->GetCTPTimeParams();
328 Double_t delay = ctp->GetDelayL1L0()*0.000000025;
329 x[2]-=delay/param->GetTSample();
330 }
331 x[2]-= param->GetNTBinsL1();
24db6af7 332 x[2]*= zwidth; // tranform time bin to the distance to the ROC
1e6337b1 333 x[2]-= 3.*param->GetZSigma() + time0corrTime;
24db6af7 334 // subtract the time offsets
335 x[2] = sign*( param->GetZLength(sector) - x[2]);
c1bdda91 336}
337
c2da420d 338void AliTPCTransform::RotatedGlobal2Global(Int_t sector,Double_t *x) const {
24db6af7 339 //
340 // transform possition rotated global to the global
341 //
c1bdda91 342 Double_t cos,sin;
343 GetCosAndSin(sector,cos,sin);
344 Double_t tmp=x[0];
e81544f7 345 x[0]= cos*tmp-sin*x[1];
346 x[1]=+sin*tmp+cos*x[1];
c1bdda91 347}
348
c2da420d 349void AliTPCTransform::Global2RotatedGlobal(Int_t sector,Double_t *x) const {
24db6af7 350 //
351 // tranform possition Global2RotatedGlobal
352 //
c1bdda91 353 Double_t cos,sin;
354 GetCosAndSin(sector,cos,sin);
355 Double_t tmp=x[0];
e81544f7 356 x[0]= cos*tmp+sin*x[1];
357 x[1]= -sin*tmp+cos*x[1];
c1bdda91 358}
359
c2da420d 360void AliTPCTransform::GetCosAndSin(Int_t sector,Double_t &cos,
c1bdda91 361 Double_t &sin) const {
362 cos=fCoss[sector%18];
363 sin=fSins[sector%18];
364}
365
c1bdda91 366
43a74775 367void AliTPCTransform::ApplyTransformations(Double_t */*xyz*/, Int_t /*volID*/){
368 //
369 // Modify global position
370 // xyz - global xyz position
371 // volID - volID of detector (sector number)
372 //
373 //
374
375}