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[u/mrichter/AliRoot.git] / ITS / AliITSsegmentationSSD.cxx
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b0f5e3fc 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 **************************************************************************/
4ae5bbc4 15
88cb7938 16/* $Id$ */
b0f5e3fc 17
4ae5bbc4 18#include <Riostream.h>
55d2c544 19#include <TMath.h>
c9649d1e 20#include <TGeoManager.h>
21#include <TGeoVolume.h>
22#include <TGeoBBox.h>
b0f5e3fc 23#include "AliITSsegmentationSSD.h"
55d2c544 24
25//////////////////////////////////////////////////////
26// Segmentation class for //
27// silicon strips //
28// //
29//////////////////////////////////////////////////////
c60e9baf 30const Float_t AliITSsegmentationSSD::fgkDxDefault = 73000.;
55d2c544 31const Float_t AliITSsegmentationSSD::fgkDzDefault = 40000.;
32const Float_t AliITSsegmentationSSD::fgkDyDefault = 300.;
33const Float_t AliITSsegmentationSSD::fgkPitchDefault = 95.;
34const Int_t AliITSsegmentationSSD::fgkNstripsDefault = 768;
6d38396a 35const Int_t AliITSsegmentationSSD::fgkNchipsPerSide = 6;
36const Int_t AliITSsegmentationSSD::fgkNstripsPerChip = 128;
fd61217e 37
fe7d86eb 38using std::endl;
39using std::cout;
b0f5e3fc 40ClassImp(AliITSsegmentationSSD)
fa4f0f62 41
c9649d1e 42AliITSsegmentationSSD::AliITSsegmentationSSD(Option_t *opt): AliITSsegmentation(),
e56160b8 43fNstrips(0),
44fStereoP(0),
45fStereoN(0),
46fPitch(0),
e56160b8 47fLayer(0){
179578b2 48 // default constructor
fa4f0f62 49 SetDetSize(fgkDxDefault,fgkDzDefault,fgkDyDefault);
50 SetPadSize(fgkPitchDefault,0.);
51 SetNPads(fgkNstripsDefault,0);
52 SetAngles();
c9649d1e 53 if(strstr(opt,"TGeo")){
54 if(!gGeoManager){
55 AliError("Geometry is not initialized\n");
56 return;
57 }
58 TGeoVolume *v=NULL;
59 v = gGeoManager->GetVolume("ITSssdSensitivL5");
60 if(!v){
61 AliWarning("TGeo volumeITSssdSensitivL5 not found (hint: use v11Hybrid geometry)\n Using hardwired default values");
62 }
63 else {
64 TGeoBBox *s=(TGeoBBox*)v->GetShape();
65 SetDetSize(s->GetDX()*20000.,s->GetDZ()*20000.,s->GetDY()*20000.);
66 }
67 }
b0f5e3fc 68}
fa4f0f62 69
55d2c544 70//______________________________________________________________________
71void AliITSsegmentationSSD::Copy(TObject &obj) const {
72 // protected method. copy this to obj
73 AliITSsegmentation::Copy(obj);
74 ((AliITSsegmentationSSD& ) obj).Clear();
75 ((AliITSsegmentationSSD& ) obj).fNstrips = fNstrips;
76 ((AliITSsegmentationSSD& ) obj).fStereoP = fStereoP;
77 ((AliITSsegmentationSSD& ) obj).fStereoN = fStereoN;
55d2c544 78 ((AliITSsegmentationSSD& ) obj).fLayer = fLayer;
79 ((AliITSsegmentationSSD& ) obj).fPitch = fPitch;
80 ((AliITSsegmentationSSD& ) obj).fLayer = fLayer;
81
82}
83
179578b2 84//______________________________________________________________________
85AliITSsegmentationSSD& AliITSsegmentationSSD::operator=(
55d2c544 86 const AliITSsegmentationSSD &source){
0315d466 87// Operator =
55d2c544 88 if(this != &source){
89 source.Copy(*this);
90 }
91 return *this;
b0f5e3fc 92}
179578b2 93//______________________________________________________________________
55d2c544 94AliITSsegmentationSSD::AliITSsegmentationSSD(const AliITSsegmentationSSD &source):
e56160b8 95 AliITSsegmentation(source),
96fNstrips(0),
97fStereoP(0),
98fStereoN(0),
99fPitch(0),
e56160b8 100fLayer(0){
179578b2 101 // copy constructor
55d2c544 102 source.Copy(*this);
b0f5e3fc 103}
179578b2 104//----------------------------------------------------------------------
b0f5e3fc 105void AliITSsegmentationSSD::Init(){
179578b2 106 // standard initalizer
b0f5e3fc 107
55d2c544 108 SetPadSize(fgkPitchDefault,0.);
109 SetNPads(fgkNstripsDefault,0);
b0f5e3fc 110 SetAngles();
179578b2 111}
112//----------------------------------------------------------------------
55d2c544 113void AliITSsegmentationSSD::Angles(Float_t &aP,Float_t &aN) const{
114 // P and N side stereo angles
82adfb7d 115 aP = fStereoP;
116 aN = fStereoN;
0315d466 117}
179578b2 118//----------------------------------------------------------------------
119void AliITSsegmentationSSD::SetLayer(Int_t l){
55d2c544 120 //set fLayer data member (only 5 or 6 are allowed)
179578b2 121 if (l==5) fLayer =5;
82adfb7d 122 else if (l==6) fLayer =6;
123 else AliError(Form("Layer can be 5 or 6, not %d",l));
179578b2 124}
125//----------------------------------------------------------------------
55d2c544 126void AliITSsegmentationSSD::GetPadTxz(Float_t &x,Float_t &z) const{
179578b2 127 // returns P and N sided strip numbers for a given location.
128 // Transformation from microns detector center local coordinates
129 // to detector P and N side strip numbers..
130 /* _- Z
131 + angle / ^
132 fNstrips v | N-Side ...0
133 \-------/------------|-----------\--------\
134 |\\\\\\/////////////.|\\\\\\\\\\\\\\\\\\\\|
135 |0\\\\/////////////..|.\\\\\\\\\\\\\\\\\\\|
136 |00\\/////////////...|..\\\\\\\\\\\\\\\\\\|
137 X <--|000/////////////... |...\\\\\\\\\\\\\\\\\|
138 |00/////////////... | ...\\\\\\\\\\\\\\\\|
139 |0/////////////... | ...\\\\\\\\\\\\\\\|
140 |//////////////... | ...\\\\\\\\\\\\\\\|
141 /-----\--------------|--------------------/
142 fNstrips-1 P-Side ...0
143 |0\
144 |00\
145 Dead region: |000/
146 |00/
147 |0/
8be4e1b1 148 // expects x, z in cm
179578b2 149 */
82adfb7d 150
151 /*
55d2c544 152 Float_t stereoP, stereoN;
153 Angles(stereoP,stereoN);
154 Float_t tanP = TMath::Tan(stereoP);
155 Float_t tanN = TMath::Tan(-stereoN);
179578b2 156 Float_t x1 = x;
157 Float_t z1 = z;
158 x1 += fDx/2;
159 z1 += fDz/2;
160 x = (x1 - z1*tanP)/fPitch;
161 z = (x1 - tanN*(z1 - fDz))/fPitch;
82adfb7d 162 */
163
6f67f5b3 164 Float_t tP=0;
165 Float_t tN=0;
82adfb7d 166 if(fLayer==5) {
6f67f5b3 167 tP = 105.26*x - 0.7895*z + 382.000; //- 0.79*z + 381.89;
168 tN = tP + 3.684*z - 4;
82adfb7d 169 }
170 else if(fLayer==6) {
6f67f5b3 171 tP = -105.26*x - 0.7895*z + 385.000; //- 0.79*z + 384.66;
172 tN = tP + 3.684*z + 4;
82adfb7d 173 }
174 else AliError("Layer can be 5 or 6");
175
6f67f5b3 176 x=tP;
177 z=tN;
82adfb7d 178
179578b2 179}
180//----------------------------------------------------------------------
55d2c544 181void AliITSsegmentationSSD::GetPadIxz(Float_t x,Float_t z,Int_t &iP,Int_t &iN) const {
0315d466 182 // returns P and N sided strip numbers for a given location.
8be4e1b1 183 // expects x, z in cm
0315d466 184
8be4e1b1 185 GetPadTxz(x,z);
186 iP = Int_t(x+0.5);
187 iN = Int_t(z+0.5);
b0f5e3fc 188}
0315d466 189//-------------------------------------------------------
8be4e1b1 190void AliITSsegmentationSSD::GetPadCxz(Float_t iP,Float_t iN,Float_t &x,Float_t &z) const {
179578b2 191 // actually this is the GetCrossing(Float_t &,Float_t &)
8be4e1b1 192 // returns local x, z in cm
193 const Float_t kStartXzero=3.64325;
194 const Float_t kDeltaXzero5or6=0.02239;
195 const Float_t kDeltaZ5to6=7.6/7.0;
b0f5e3fc 196
8be4e1b1 197 z = 1.9*(iN-iP)/7.0;
198 x = kStartXzero-(285*iN + 1045*iP)/140000.0;
b0f5e3fc 199
8be4e1b1 200 if (fLayer==5){
201 z += kDeltaZ5to6;
202 x = -x + kDeltaXzero5or6;
203 }
204 else if (fLayer==6) {
205 z -= kDeltaZ5to6;
206 x += kDeltaXzero5or6;
207 }
208 else {
209 AliWarning("Layer shoudl be 5 or 6");
210 x = -99999;
211 z = -99999;
212 }
b0f5e3fc 213}
179578b2 214//______________________________________________________________________
aacedc3e 215Bool_t AliITSsegmentationSSD::LocalToDet(Float_t x,Float_t z,
55d2c544 216 Int_t &iP,Int_t &iN) const {
179578b2 217 // Transformation from Geant cm detector center local coordinates
218 // to detector P and N side strip numbers..
219 /* _- Z
220 + angle / ^
221 fNstrips v | N-Side ...0
222 \-------/------------|-----------\--------\
223 |\\\\\\/////////////.|\\\\\\\\\\\\\\\\\\\\|
224 |0\\\\/////////////..|.\\\\\\\\\\\\\\\\\\\|
225 |00\\/////////////...|..\\\\\\\\\\\\\\\\\\|
226 X <--|000/////////////... |...\\\\\\\\\\\\\\\\\|
227 |00/////////////... | ...\\\\\\\\\\\\\\\\|
228 |0/////////////... | ...\\\\\\\\\\\\\\\|
229 |//////////////... | ...\\\\\\\\\\\\\\\|
230 /-----\--------------|--------------------/
231 fNstrips-1 P-Side ...0
232 |0\
233 |00\
234 Dead region: |000/
235 |00/
236 |0/
237 */
6d38396a 238 Float_t dx,dz;
239 const Double_t kconst = 1.0E-04; // convert microns to cm.
240 dx = 0.5*kconst*Dx();
241 dz = 0.5*kconst*Dz();
23197852 242 if( (x<-dx) || (x>dx) ) {
243 iP=-1;
244 AliWarning(Form("Input argument %f out of range (%f, %f)",x,dx,-dx));
245 return kFALSE; // outside of defined volume.
246 } // outside x range.
247 if( (z<-dz) || (z>dz) ) {
248 iN=-1;
249 AliWarning(Form("Input argument %f out of range (%f, %f)",z,dz,-dz));
250 return kFALSE; // outside of defined volume.
251 }
6d38396a 252
82adfb7d 253 //x /= kconst; // convert to microns
254 //z /= kconst; // convert to microns
6d38396a 255 this->GetPadTxz(x,z);
256
257 // first for P side
258 iP = (Int_t) x;
259 if(iP<0 || iP>=fNstrips) iP=-1; // strip number must be in range.
260 // Now for N side)
261 iN = (Int_t) z;
262 if(iN<0 || iN>=fNstrips) iN=-1; // strip number must be in range.
263 return kTRUE;
179578b2 264}
265//----------------------------------------------------------------------
266void AliITSsegmentationSSD::DetToLocal(Int_t ix,Int_t iPN,
55d2c544 267 Float_t &x,Float_t &z) const{
179578b2 268 // Transformation from detector segmentation/cell coordiantes starting
269 // from 0. iPN=0 for P side and 1 for N side strip. Returned is z=0.0
270 // and the corresponding x value..
271 /* _- Z
272 + angle / ^
273 fNstrips v | N-Side ...0
274 \-------/------------|-----------\--------\
275 |\\\\\\/////////////.|\\\\\\\\\\\\\\\\\\\\|
276 |0\\\\/////////////..|.\\\\\\\\\\\\\\\\\\\|
277 |00\\/////////////...|..\\\\\\\\\\\\\\\\\\|
278 X <--|000/////////////... |...\\\\\\\\\\\\\\\\\|
279 |00/////////////... | ...\\\\\\\\\\\\\\\\|
280 |0/////////////... | ...\\\\\\\\\\\\\\\|
281 |//////////////... | ...\\\\\\\\\\\\\\\|
282 /-----\--------------|--------------------/
283 fNstrips-1 P-Side ...0
284 |0\
285 |00\
286 Dead region: |000/
287 |00/
288 |0/
289 */
290 // for strips p-side
291 // x = a + b + z*tan(fStereoP); a = Dpx(iP)*(iP+0.5)-dx; b = dz*th;
292 // for strips n-side
293 // x = a + b + z*tan(fStereoP); a = Dpx(iN)*(iN+0.5)-dx; b = -dz*th;
8be4e1b1 294 AliWarning("This function has not been verified. Should probably use GetPadCxz");
179578b2 295 const Double_t kconst = 1.0E-04; // convert microns to cm.
296 Float_t flag=kconst*Dx(); // error value
297 Double_t th=0.0,dx,dz,i,a,b=0.0,xb[4],zb[4];
55d2c544 298 Float_t stereoP, stereoN;
299 Angles(stereoP,stereoN);
5752a110 300
179578b2 301 z = 0.0; // Strip center in z.
302 if(iPN<0 || iPN>1){// if error return full detector size in x.
303 x = z = flag;
304 return;
305 } // end if
306 if(ix<0 || ix>=fNstrips) { // if error return full detector size in x.
307 x = z = flag;
308 return;
309 } // end if
310 i = (Double_t) ix; // convert to double
311 dx = 0.5*kconst*Dx(); // half distance in x in cm
312 dz = 0.5*kconst*Dz(); // half distance in z in cm
313 a = kconst*Dpx(ix)*(i+0.5)-dx; // Min x value.
314 if(iPN==0){ //P-side angle defined backwards.
55d2c544 315 th = TMath::Tan(stereoP);
179578b2 316 b = dz*th;
317 }else if(iPN==1){ // N-side
55d2c544 318 th = TMath::Tan(-stereoN);
179578b2 319 b = -dz*th;
320 } // end if
321 // compute average/center position of the strip.
322 xb[0] = +dx; if(th!=0.0) zb[0] = (+dx-a-b)/th; else zb[0] = 0.0;
323 xb[1] = -dx; if(th!=0.0) zb[1] = (-dx-a-b)/th; else zb[1] = 0.0;
324 xb[2] = a+b+dz*th; zb[2] = +dz;
325 xb[3] = a+b-dz*th; zb[3] = -dz;
326 x = 0.0; z = 0.0;
327 for(Int_t j=0;j<4;j++){
328 if(xb[j]>=-dx && xb[j]<=dx && zb[j]>=-dz && zb[j]<=dz){
329 x += xb[j];
330 z += zb[j];
331 } // end if
332 } // end for
333 x *= 0.5;
334 z *= 0.5;
335 return;
336}
337//----------------------------------------------------------------------
6d38396a 338Int_t AliITSsegmentationSSD::GetChipFromChannel(Int_t ix, Int_t iz) const {
339 // returns chip number (in range 0-11) starting from channel number
340
341 if( (iz>=fgkNstripsDefault) || (iz<0) || (ix<0) || (ix>1) ) {
342 AliError("Bad cell number");
343 return -1;
344 }
345
346 if(ix==1) iz = 1535-iz;
347 Int_t theChip =iz/fgkNstripsPerChip;
348 return theChip;
349
350}
351//----------------------------------------------------------------------
352Int_t AliITSsegmentationSSD::GetChipFromLocal(Float_t xloc, Float_t zloc) const
353{
354 // returns chip numbers starting from local coordinates
355 // The two Nside chip number and Pside chip number are
356 // coded as chip=Nchip*10+Pchip
357
358 Int_t iP=0;
359 Int_t iN=0;
360 if (!LocalToDet(xloc,zloc,iP,iN) ||
361 (iP<0) || (iP>=fNstrips) || (iN<0) || (iN>=fNstrips) ) {
23197852 362 //AliWarning("Bad local coordinate");
6d38396a 363 return -1;
364 }
365
366 Int_t iChip = GetChipFromChannel(0,iP);
367 iChip += 10*GetChipFromChannel(1,iN); // add Nside
368
369 return iChip;
370
371}
372//
373
23197852 374Int_t AliITSsegmentationSSD::GetChipsInLocalWindow(Int_t* array, Float_t zmin, Float_t zmax,
375 Float_t xmin, Float_t xmax) const {
18f63405 376 // returns chip number in a given xz window
23197852 377
378 Int_t nChipInW = 0;
379
380 Float_t zminDet=-fDz*1.0E-04/2.;
381 Float_t zmaxDet=fDz*1.0E-04/2.;
382 if(zmin<zminDet) zmin=zminDet;
383 if(zmax>zmaxDet) zmax=zmaxDet;
384
385 Float_t xminDet=-fDx*1.0E-04/2;
386 Float_t xmaxDet=fDx*1.0E-04/2;
387 if(xmin<xminDet) xmin=xminDet;
388 if(xmax>xmaxDet) xmax=xmaxDet;
389
390 Int_t n1N=-1;
391 Int_t n1P=-1;
392 Int_t n1=GetChipFromLocal(xmin,zmin);
393 if(n1!=-1) { // Note! Recpoint can be on the sensor but in the dead area not covered by strips!
394 n1N = (Int_t) (n1/10); // N-side chip coded as 10*chip_index
395 n1P = n1 - 10 * n1N; // P-side chip coded 0-5
396 array[nChipInW]=n1P;
397 nChipInW++;
398 array[nChipInW]=n1N;
399 nChipInW++;
400 }
401
402 Int_t n2N=-1;
403 Int_t n2P=-1;
404 Int_t n2=GetChipFromLocal(xmin,zmax);
405 if(n2!=-1) { // Note! Recpoint can be on the sensor but in the dead area not covered by strips!
406 n2N = (Int_t) (n2/10); // N-side chip coded as 10*chip_index
407 n2P = n2 - 10 * n2N; // P-side chip coded 0-5
408 if(n2P!=n1P) { array[nChipInW]=n2P; nChipInW++;}
409 if(n2N!=n1N) { array[nChipInW]=n2N; nChipInW++;}
410 }
411
412 Int_t n3N=-1;
413 Int_t n3P=-1;
414 Int_t n3=GetChipFromLocal(xmax,zmin);
415 if(n3!=-1) {
416 n3N=(Int_t) (n3/10); // N-side chip coded as 10*chip_index
417 n3P=n3 - 10 * n3N; // P-side chip coded 0-5
418 if((n3P!=n1P)&&(n3P!=n2P)) { array[nChipInW]=n3P; nChipInW++;}
419 if((n3N!=n1N)&&(n3N!=n2N)) { array[nChipInW]=n3N; nChipInW++;}
420 }
421
422 Int_t n4N=-1;
423 Int_t n4P=-1;
424 Int_t n4=GetChipFromLocal(xmax,zmax);
425 if(n4!=-1) {
426 n4N=(Int_t) (n4/10); // N-side chip coded as 10*chip_index
427 n4P=n4 - 10 * n4N; // P-side chip coded 0-5
428 if((n4P!=n1P)&&(n4P!=n2P)&&(n4P!=n3P)) { array[nChipInW]=n4P; nChipInW++;}
429 if((n4N!=n1N)&&(n4N!=n2N)&&(n4N!=n3N)) { array[nChipInW]=n4N; nChipInW++;}
430 }
431
432 return nChipInW;
433
434}
435
6d38396a 436//----------------------------------------------------------------------
55d2c544 437void AliITSsegmentationSSD::PrintDefaultParameters() const {
438// Print default values for parameters.
439// Values specified as static const data members are shown
440
441 cout<<"fgkDxDefault = "<<fgkDxDefault<<endl;
442 cout<<"fgkDzDefault = "<<fgkDzDefault<<endl;
443 cout<<"fgkDyDefault = "<<fgkDyDefault<<endl;
444 cout<<"fgkPitchDefault = "<<fgkPitchDefault<<endl;
445 cout<<"fgkNstripsDefault = "<<fgkNstripsDefault<<endl;
446}