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 **************************************************************************/
16 #include "AliITSsegmentationSPD.h"
17 //#include "AliITSgeom.h"
18 //////////////////////////////////////////////////////
19 // Segmentation class for //
22 //////////////////////////////////////////////////////
23 ClassImp(AliITSsegmentationSPD)
25 //_____________________________________________________________________________
26 AliITSsegmentationSPD::AliITSsegmentationSPD(): AliITSsegmentation(),
29 // Default constructor
30 for(Int_t k=0; k<256; k++){
36 //_____________________________________________________________________________
37 Float_t AliITSsegmentationSPD::ColFromZ300(Float_t z) const {
38 // Get column number for each z-coordinate taking into account the
39 // extra pixels in z direction assuming 300 micron sized pixels.
41 Float_t pitchz = 300.0;
42 col = Float_t (z/pitchz);
45 //_____________________________________________________________________________
46 Float_t AliITSsegmentationSPD::ZFromCol300(Int_t col) const {
47 // same comments as above
48 // Get z-coordinate for each colunm number
49 Float_t pitchz = 300.0;
54 //_____________________________________________________________________________
55 Float_t AliITSsegmentationSPD::ZpitchFromCol300(Int_t col) const {
56 // returns Z pixel pitch for 300 micron pixels.
58 col = 0; // done to remove unused variable warning.
61 //_____________________________________________________________________________
62 Float_t AliITSsegmentationSPD::ColFromZ(Float_t z) const {
63 // hard-wired - keep it like this till we can parametrise
64 // and get rid of AliITSgeomSPD425
65 // Get column number for each z-coordinate taking into account the
66 // extra pixels in z direction
71 AliError(Form("z=%f outside of range 0.0<=z<fDz=%f",z,fDz));
73 } // end if outsize of detector
81 col = (Float_t) i + (z-s)/fCellSizeZ[i];
88 col = Float_t(z/pitchz);
89 } else if( z < 14425) {
91 col = 31 + (z - 13175)/pitchz;
92 } else if( z < 27175) {
93 col = 33 + (z - 14425)/pitchz;
94 } else if( z < 28425) {
96 col = 63 + (z - 27175)/pitchz;
97 } else if( z < 41175) {
98 col = 65 + (z - 28425)/pitchz;
99 } else if( z < 42425) {
101 col = 95 + (z - 41175)/pitchz;
102 } else if( z < 55175) {
103 col = 97 + (z - 42425)/pitchz;
104 } else if( z < 56425) {
106 col = 127 + (z - 55175)/pitchz;
107 } else if( z < 69175) {
108 col = 129 + (z - 56425)/pitchz;
109 } else if( z < 70425) {
111 col = 159 + (z - 69175)/pitchz;
112 } else if( z < 83600) {
113 col = 161 + (z - 70425)/pitchz;
115 return TMath::Abs(col);*/
118 //_____________________________________________________________________________
119 Float_t AliITSsegmentationSPD::ZFromCol(Int_t col) const {
120 // same comments as above
121 // Get z-coordinate for each colunm number
125 if(col<0||col>=fNpz){
126 AliError(Form("col=%d outside of range 0<=col<fNpZ=%d",col,fNpz));
128 } // end if outsize of detector
130 for(i=0;i<col;i++) z += fCellSizeZ[i];
131 z += 0.5*fCellSizeZ[col];
135 Float_t pitchz = 425;
137 if( col >=0 && col <= 30 ) {
138 z = (col + 0.5)*pitchz;
139 } else if( col >= 31 && col <= 32) {
141 z = 13175 + (col -31 + 0.5)*pitchz;
142 } else if( col >= 33 && col <= 62) {
143 z = 14425 + (col -33 + 0.5)*pitchz;
144 } else if( col >= 63 && col <= 64) {
146 z = 27175 + (col -63 + 0.5)*pitchz;
147 } else if( col >= 65 && col <= 94) {
148 z = 28425 + (col -65 + 0.5)*pitchz;
149 } else if( col >= 95 && col <= 96) {
151 z = 41175 + (col -95 + 0.5)*pitchz;
152 } else if( col >= 97 && col <= 126) {
153 z = 42425 + (col -97 + 0.5)*pitchz;
154 } else if( col >= 127 && col <= 128) {
156 z = 55175 + (col -127 + 0.5)*pitchz;
157 } else if( col >= 129 && col <= 158) {
158 z = 56425 + (col -129 + 0.5)*pitchz;
159 } else if( col >= 159 && col <= 160) {
161 z = 69175 + (col -159 + 0.5)*pitchz;
162 } else if( col >= 161 && col <= 191) {
163 z = 70425 + (col -161 + 0.5)*pitchz;
168 //______________________________________________________________________
169 Float_t AliITSsegmentationSPD::ZpitchFromCol(Int_t col) const {
170 // Get pitch size in z direction for each colunm
172 Float_t pitchz = 425.;
175 } else if(col >= 31 && col <= 32) {
177 } else if(col >= 63 && col <= 64) {
179 } else if(col >= 95 && col <= 96) {
181 } else if(col >= 127 && col <= 128) {
183 } else if(col >= 159 && col <= 160) {
190 //______________________________________________________________________
191 AliITSsegmentationSPD::AliITSsegmentationSPD(AliITSgeom *gm):
192 AliITSsegmentation(gm),
199 //______________________________________________________________________
200 void AliITSsegmentationSPD::Copy(TObject &obj) const {
201 // protected method. copy this to obj
202 AliITSsegmentation::Copy(obj);
203 ((AliITSsegmentationSPD& ) obj).fNpx = fNpx;
204 ((AliITSsegmentationSPD& ) obj).fNpz = fNpz;
207 ((AliITSsegmentationSPD& ) obj).fCellSizeX[i] = fCellSizeX[i];
209 ((AliITSsegmentationSPD& ) obj).fCellSizeZ[i] = fCellSizeZ[i];
212 //______________________________________________________________________
213 AliITSsegmentationSPD& AliITSsegmentationSPD::operator=(const AliITSsegmentationSPD &source){
215 if(this==&source) return *this;
219 //____________________________________________________________________________
220 AliITSsegmentationSPD::AliITSsegmentationSPD(const AliITSsegmentationSPD &source) :
221 AliITSsegmentation(source),
227 //----------------------------------------------------------------------
228 void AliITSsegmentationSPD::SetBinSize(Float_t *x,Float_t *z){
229 // Fills the array of pixel sizes in x, microns
230 // The input array x must have 256 elements.
233 for(i=0;i<256;i++) fCellSizeX[i] = x[i];
234 for(i=0;i<280;i++) fCellSizeZ[i] = z[i];
237 //----------------------------------------------------------------------
238 void AliITSsegmentationSPD::Init300(){
239 // Initialize infromation for 6 read out chip 300X50 micron pixel SPD
240 // detectors. This chip is 150 microns thick by 1.28 cm in x by 8.37 cm
241 // long. It has 256 50 micron pixels in x and 279 300 micron size
244 //const Float_t kconv=10000.;
246 fNpx = 256; // The number of X pixel Cell same as in fCellSizeX array size
247 fNpz = 279; // The number of Z pixel Cell same as in fCellSizeZ array size
248 for(i=0;i<fNpx;i++) fCellSizeX[i] = 50.0; // microns all the same
249 for(i=0;i<280;i++) fCellSizeZ[i] = ZpitchFromCol300(i); // microns
250 // for(i=fNpz;i<280;i++) fCellSizeZ[i] = 0.0; // zero out rest of array
252 for(i=0;i<fNpx;i++) fDx += fCellSizeX[i];
254 for(i=0;i<fNpz;i++) fDz += fCellSizeZ[i];
255 fDy = 300.0; //microns SPD sensitive layer thickness
258 //------------------------------
259 void AliITSsegmentationSPD::Init(){
260 // Initialize infromation for 6 read out chip 425X50 micron pixel SPD
261 // detectors. This chip is 150 microns thick by 1.28 cm in x by 8.375 cm
262 // long. It has 256 50 micron pixels in x and 197 mostly 425 micron size
263 // pixels in z. The two pixels between each readout chip are 625 microns long.
265 //const Float_t kconv=10000.;
267 fNpx = 256; // The number of X pixel Cell same as in fCellSizeX array size
268 fNpz = 192; // The number of Z pixel Cell same as in fCellSizeZ array size
269 for(i=0;i<fNpx;i++) fCellSizeX[i] = 50.0; // microns all the same
270 for(i=0;i<280;i++) fCellSizeZ[i] = ZpitchFromCol(i); // microns
271 // for(i=fNpz;i<280;i++) fCellSizeZ[i] = 0.0; // zero out rest of array
273 for(i=0;i<fNpx;i++) fDx += fCellSizeX[i];
275 for(i=0;i<fNpz;i++) fDz += fCellSizeZ[i];
276 fDy = 300.0; //microns SPD sensitive layer thickness
277 //printf(" AliITSsegmentationSPD - Init: fNpx fNpz fDx fDz %d %d %f %f\n",fNpx, fNpz, fDx, fDz);
280 //------------------------------
281 void AliITSsegmentationSPD::SetNPads(Int_t p1, Int_t p2){
282 // for SPD this function should be used ONLY when a beam test setup
283 // configuration is studied
290 //------------------------------
291 Float_t AliITSsegmentationSPD::Dpx(Int_t i) const {
292 //returs x pixel pitch for a give pixel
293 if(i<0||i>=256) return 0.0;
294 return fCellSizeX[i];
296 //------------------------------
297 Float_t AliITSsegmentationSPD::Dpz(Int_t i) const {
298 // returns z pixel pitch for a give pixel
299 if(i<0||i>=280) return 0.0;
300 return fCellSizeZ[i];
302 //------------------------------
303 void AliITSsegmentationSPD::GetPadIxz(Float_t x,Float_t z,Int_t &ix,Int_t &iz) const {
304 // Returns pixel coordinates (ix,iz) for given real local coordinates (x,z)
307 // expects x, z in microns
309 // same segmentation on x
311 ix = (Int_t)(x/dpx + 1);
312 // different segmentation on z
313 iz = (Int_t)(ColFromZ(z) + 1);
316 if (iz > fNpz) iz= fNpz;
317 if (ix > fNpx) ix= fNpx;
319 if (iz < -fNpz) iz= -fNpz;
320 if (ix < -fNpx) ix=-fNpx;
324 //------------------------------
325 void AliITSsegmentationSPD::GetPadTxz(Float_t &x,Float_t &z) const{
326 // local transformation of real local coordinates (x,z)
329 // expects x, z in microns
331 // same segmentation on x
338 //------------------------------
339 void AliITSsegmentationSPD::GetPadCxz(Int_t ix,Int_t iz,Float_t &x,Float_t&z) const {
340 // Transform from pixel to real local coordinates
342 // returns x, z in microns
346 x = (ix>0) ? Float_t(ix*dpx)-dpx/2. : Float_t(ix*dpx)+dpx/2.;
351 //------------------------------
352 void AliITSsegmentationSPD::
353 Neighbours(Int_t iX, Int_t iZ, Int_t* Nlist, Int_t Xlist[8], Int_t Zlist[8]) const {
354 // returns the neighbouring pixels for use in Cluster Finders and the like.
356 *Nlist=4;Xlist[0]=Xlist[1]=iX;Xlist[2]=iX-1;Xlist[3]=iX+1;
357 Zlist[0]=iZ-1;Zlist[1]=iZ+1;Zlist[2]=Zlist[3]=iZ;
362 Xlist[0]=Xlist[1]=iX;
367 Zlist[2]=Zlist[3]=iZ;
382 //______________________________________________________________________
383 Bool_t AliITSsegmentationSPD::LocalToDet(Float_t x,Float_t z,
384 Int_t &ix,Int_t &iz) const {
385 // Transformation from Geant detector centered local coordinates (cm) to
386 // Pixel cell numbers ix and iz.
388 // Float_t x detector local coordinate x in cm with respect to
389 // the center of the sensitive volume.
390 // Float_t z detector local coordinate z in cm with respect to
391 // the center of the sensitive volulme.
393 // Int_t ix detector x cell coordinate. Has the range
395 // Int_t iz detector z cell coordinate. Has the range
398 // kTRUE if point x,z is inside sensitive volume, kFALSE otherwise.
399 // A value of -1 for ix or iz indecates that this point is outside of the
400 // detector segmentation as defined.
403 const Float_t kconv = 1.0E-04; // converts microns to cm.
405 dx = -0.5*kconv*Dx();
406 dz = -0.5*kconv*Dz();
409 if(x<dx) return kFALSE; // outside x range.
410 if(z<dz) return kFALSE; // outside z range.
411 for(i=0;i<Npx();i++){
412 dx += kconv*fCellSizeX[i];
415 if(i>=Npx()) return kFALSE; // outside x range.
416 for(j=0;j<Npz();j++){
417 dz += kconv*fCellSizeZ[j];
420 if(j>=Npz()) return kFALSE; // outside z range.
423 return kTRUE; // Found ix and iz, return.
425 //______________________________________________________________________
426 void AliITSsegmentationSPD::DetToLocal(Int_t ix,Int_t iz,Float_t &x,Float_t &z) const
428 // Transformation from Detector cell coordiantes to Geant detector centerd
429 // local coordinates (cm).
431 // Int_t ix detector x cell coordinate. Has the range 0<=ix<fNpx.
432 // Int_t iz detector z cell coordinate. Has the range 0<=iz<fNpz.
434 // Float_t x detector local coordinate x in cm with respect to the
435 // center of the sensitive volume.
436 // Float_t z detector local coordinate z in cm with respect to the
437 // center of the sensitive volulme.
438 // If ix and or iz is outside of the segmentation range a value of -0.5*Dx()
439 // or -0.5*Dz() is returned.
441 const Float_t kconv = 1.0E-04; // converts microns to cm.
443 x = -0.5*kconv*Dx(); // default value.
444 z = -0.5*kconv*Dz(); // default value.
445 if(ix<0 || ix>=Npx()) return; // outside of detector
446 if(iz<0 || iz>=Npz()) return; // outside of detctor
447 for(i=0;i<ix;i++) x += kconv*fCellSizeX[i]; // sum up to cell ix-1
448 x += 0.5*kconv*fCellSizeX[ix]; // add 1/2 of cell ix for center location.
449 for(j=0;j<iz;j++) z += kconv*fCellSizeZ[j]; // sum up cell iz-1
450 z += 0.5*kconv*fCellSizeZ[iz]; // add 1/2 of cell iz for center location.
451 return; // Found x and z, return.
453 //______________________________________________________________________
454 void AliITSsegmentationSPD::CellBoundries(Int_t ix,Int_t iz,
455 Double_t &xl,Double_t &xu,
456 Double_t &zl,Double_t &zu) const
458 // Transformation from Detector cell coordiantes to Geant detector centerd
459 // local coordinates (cm).
461 // Int_t ix detector x cell coordinate. Has the range 0<=ix<fNpx.
462 // Int_t iz detector z cell coordinate. Has the range 0<=iz<fNpz.
464 // Double_t xl detector local coordinate cell lower bounds x in cm
465 // with respect to the center of the sensitive volume.
466 // Double_t xu detector local coordinate cell upper bounds x in cm
467 // with respect to the center of the sensitive volume.
468 // Double_t zl detector local coordinate lower bounds z in cm with
469 // respect to the center of the sensitive volulme.
470 // Double_t zu detector local coordinate upper bounds z in cm with
471 // respect to the center of the sensitive volulme.
472 // If ix and or iz is outside of the segmentation range a value of -0.5*Dx()
473 // and -0.5*Dx() or -0.5*Dz() and -0.5*Dz() are returned.
475 const Float_t kconv = 1.0E-04; // converts microns to cm.
478 xl = xu = x = -0.5*kconv*Dx(); // default value.
479 zl = zu = z = -0.5*kconv*Dz(); // default value.
480 if(ix<0 || ix>=Npx()) return; // outside of detector
481 if(iz<0 || iz>=Npz()) return; // outside of detctor
482 for(i=0;i<ix;i++) x += kconv*fCellSizeX[i]; // sum up to cell ix-1
484 x += kconv*fCellSizeX[ix];
486 for(j=0;j<iz;j++) z += kconv*fCellSizeZ[j]; // sum up cell iz-1
488 z += kconv*fCellSizeZ[iz];
490 return; // Found x and z, return.