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 **************************************************************************/
17 #include <TGeoManager.h>
18 #include <TGeoVolume.h>
20 #include "AliITSsegmentationSPD.h"
22 //////////////////////////////////////////////////////
23 // Segmentation class for //
26 //////////////////////////////////////////////////////
27 const Int_t AliITSsegmentationSPD::fgkNchipsPerModule = 5;
28 const Int_t AliITSsegmentationSPD::fgkNcolumnsPerChip = 32;
29 ClassImp(AliITSsegmentationSPD)
31 //_____________________________________________________________________________
32 AliITSsegmentationSPD::AliITSsegmentationSPD(Option_t *opt): AliITSsegmentation(),
35 // Default constructor
37 // Initialization to default values
40 // Initialization of detector dimensions from TGeo
41 if(strstr(opt,"TGeo")){
43 AliError("Geometry is not initialized\n Using hardwired default values");
47 v = gGeoManager->GetVolume("ITSSPDlay1-sensor");
49 AliWarning("TGeo volume ITSSPDlay1-sensor not found (hint: use v11Hybrid geometry)\n Using hardwired default values");
52 TGeoBBox *s=(TGeoBBox*)v->GetShape();
53 SetDetSize(s->GetDX()*20000.,s->GetDZ()*20000.,s->GetDY()*20000.);
58 //_____________________________________________________________________________
59 Float_t AliITSsegmentationSPD::ColFromZ300(Float_t z) const {
60 // Get column number for each z-coordinate taking into account the
61 // extra pixels in z direction assuming 300 micron sized pixels.
63 Float_t pitchz = 300.0;
64 col = Float_t (z/pitchz);
67 //_____________________________________________________________________________
68 Float_t AliITSsegmentationSPD::ZFromCol300(Int_t col) const {
69 // same comments as above
70 // Get z-coordinate for each colunm number
71 Float_t pitchz = 300.0;
76 //_____________________________________________________________________________
77 Float_t AliITSsegmentationSPD::Zpitch300() const {
78 // returns Z pixel pitch for 300 micron pixels.
82 //_____________________________________________________________________________
83 Float_t AliITSsegmentationSPD::ColFromZ(Float_t z) const {
84 // hard-wired - keep it like this till we can parametrise
85 // and get rid of AliITSgeomSPD425
86 // Get column number for each z-coordinate taking into account the
87 // extra pixels in z direction
92 AliError(Form("z=%f outside of range 0.0<=z<fDz=%f",z,fDz));
94 } // end if outsize of detector
102 col = (Float_t) i + (z-s)/fCellSizeZ[i];
107 Float_t pitchz = 425;
109 col = Float_t(z/pitchz);
110 } else if( z < 14425) {
112 col = 31 + (z - 13175)/pitchz;
113 } else if( z < 27175) {
114 col = 33 + (z - 14425)/pitchz;
115 } else if( z < 28425) {
117 col = 63 + (z - 27175)/pitchz;
118 } else if( z < 41175) {
119 col = 65 + (z - 28425)/pitchz;
120 } else if( z < 42425) {
122 col = 95 + (z - 41175)/pitchz;
123 } else if( z < 55175) {
124 col = 97 + (z - 42425)/pitchz;
125 } else if( z < 56425) {
127 col = 127 + (z - 55175)/pitchz;
128 } else if( z < 69175) {
129 col = 129 + (z - 56425)/pitchz;
130 } else if( z < 70425) {
132 col = 159 + (z - 69175)/pitchz;
133 } else if( z < 83600) {
134 col = 161 + (z - 70425)/pitchz;
136 return TMath::Abs(col);*/
139 //_____________________________________________________________________________
140 Float_t AliITSsegmentationSPD::ZFromCol(Int_t col) const {
141 // same comments as above
142 // Get z-coordinate for each colunm number
146 if(col<0||col>=fNpz){
147 AliError(Form("col=%d outside of range 0<=col<fNpZ=%d",col,fNpz));
149 } // end if outsize of detector
151 for(i=0;i<col;i++) z += fCellSizeZ[i];
152 z += 0.5*fCellSizeZ[col];
156 Float_t pitchz = 425;
158 if( col >=0 && col <= 30 ) {
159 z = (col + 0.5)*pitchz;
160 } else if( col >= 31 && col <= 32) {
162 z = 13175 + (col -31 + 0.5)*pitchz;
163 } else if( col >= 33 && col <= 62) {
164 z = 14425 + (col -33 + 0.5)*pitchz;
165 } else if( col >= 63 && col <= 64) {
167 z = 27175 + (col -63 + 0.5)*pitchz;
168 } else if( col >= 65 && col <= 94) {
169 z = 28425 + (col -65 + 0.5)*pitchz;
170 } else if( col >= 95 && col <= 96) {
172 z = 41175 + (col -95 + 0.5)*pitchz;
173 } else if( col >= 97 && col <= 126) {
174 z = 42425 + (col -97 + 0.5)*pitchz;
175 } else if( col >= 127 && col <= 128) {
177 z = 55175 + (col -127 + 0.5)*pitchz;
178 } else if( col >= 129 && col <= 158) {
179 z = 56425 + (col -129 + 0.5)*pitchz;
180 } else if( col >= 159 && col <= 160) {
182 z = 69175 + (col -159 + 0.5)*pitchz;
183 } else if( col >= 161 && col <= 191) {
184 z = 70425 + (col -161 + 0.5)*pitchz;
189 //______________________________________________________________________
190 Float_t AliITSsegmentationSPD::ZpitchFromCol(Int_t col) const {
191 // Get pitch size in z direction for each colunm
193 Float_t pitchz = 425.;
196 } else if(col >= 31 && col <= 32) {
198 } else if(col >= 63 && col <= 64) {
200 } else if(col >= 95 && col <= 96) {
202 } else if(col >= 127 && col <= 128) {
204 } else if(col >= 159 && col <= 160) {
212 //______________________________________________________________________
213 void AliITSsegmentationSPD::Copy(TObject &obj) const {
214 // protected method. copy this to obj
215 AliITSsegmentation::Copy(obj);
216 ((AliITSsegmentationSPD& ) obj).fNpx = fNpx;
217 ((AliITSsegmentationSPD& ) obj).fNpz = fNpz;
220 ((AliITSsegmentationSPD& ) obj).fCellSizeX[i] = fCellSizeX[i];
222 ((AliITSsegmentationSPD& ) obj).fCellSizeZ[i] = fCellSizeZ[i];
225 //______________________________________________________________________
226 AliITSsegmentationSPD& AliITSsegmentationSPD::operator=(const AliITSsegmentationSPD &source){
228 if(this==&source) return *this;
232 //____________________________________________________________________________
233 AliITSsegmentationSPD::AliITSsegmentationSPD(const AliITSsegmentationSPD &source) :
234 AliITSsegmentation(source),
237 for(Int_t i=0; i<256; i++)fCellSizeX[i]=0.;
238 for(Int_t i=0; i<280; i++)fCellSizeZ[i]=0.;
242 //----------------------------------------------------------------------
243 void AliITSsegmentationSPD::SetBinSize(Float_t *x,Float_t *z){
244 // Fills the array of pixel sizes in x, microns
245 // The input array x must have 256 elements.
248 for(i=0;i<256;i++) fCellSizeX[i] = x[i];
249 for(i=0;i<280;i++) fCellSizeZ[i] = z[i];
252 //----------------------------------------------------------------------
253 void AliITSsegmentationSPD::Init300(){
254 // Initialize infromation for 6 read out chip 300X50 micron pixel SPD
255 // detectors. This chip is 150 microns thick by 1.28 cm in x by 8.37 cm
256 // long. It has 256 50 micron pixels in x and 279 300 micron size
259 //const Float_t kconv=10000.;
261 fNpx = 256; // The number of X pixel Cell same as in fCellSizeX array size
262 fNpz = 279; // The number of Z pixel Cell same as in fCellSizeZ array size
263 for(i=0;i<fNpx;i++) fCellSizeX[i] = 50.0; // microns all the same
264 for(i=0;i<280;i++) fCellSizeZ[i] = Zpitch300(); // microns
265 // for(i=fNpz;i<280;i++) fCellSizeZ[i] = 0.0; // zero out rest of array
267 for(i=0;i<fNpx;i++) fDx += fCellSizeX[i];
269 for(i=0;i<fNpz;i++) fDz += fCellSizeZ[i];
270 fDy = 300.0; //microns SPD sensitive layer thickness
273 //------------------------------
274 void AliITSsegmentationSPD::Init(){
275 // Initialize information for 5 read out chip 425X50 micron pixel SPD
276 // detectors (ladder).
277 // Each readout chip is 150 micron thick.
278 // The ladder sensor is 200 micron thick by 1.28 cm in x by 6.96 cm in z.
279 // It has 256 50 micron pixels in x and 160 mostly 425 micron pixels in z.
280 // The two pixels at boundary between two adjacent readout chips are
283 Float_t bx[256],bz[280];
285 SetNPads(256,160); // Number of Bins in x and z
286 for(i=000;i<256;i++) bx[i] = 50.0; // in x all are 50 microns.
287 for(i=000;i<160;i++) bz[i] = 425.0; // most are 425 microns except below
288 for(i=160;i<280;i++) bz[i] = 0.0; // Outside of detector.
289 bz[ 31] = bz[ 32] = 625.0; // first chip boundary
290 bz[ 63] = bz[ 64] = 625.0; // first chip boundary
291 bz[ 95] = bz[ 96] = 625.0; // first chip boundary
292 bz[127] = bz[128] = 625.0; // first chip boundary
293 bz[160] = 425.0; // Set so that there is no zero pixel size for fNz.
295 SetDetSize(12800,69600,200); // full lengths (x,z,y) in microns
298 //------------------------------
299 void AliITSsegmentationSPD::SetNPads(Int_t p1, Int_t p2){
300 // for SPD this function should be used ONLY when a beam test setup
301 // configuration is studied
308 //------------------------------
309 Float_t AliITSsegmentationSPD::Dpx(Int_t i) const {
310 //returs x pixel pitch for a give pixel
311 if(i<0||i>=256) return 0.0;
312 return fCellSizeX[i];
314 //------------------------------
315 Float_t AliITSsegmentationSPD::Dpz(Int_t i) const {
316 // returns z pixel pitch for a give pixel
317 if(i<0||i>=280) return 0.0;
318 return fCellSizeZ[i];
320 //------------------------------
321 void AliITSsegmentationSPD::GetPadIxz(Float_t x,Float_t z,Int_t &ix,Int_t &iz) const {
322 // Returns pixel coordinates (ix,iz) for given real local coordinates (x,z)
325 // expects x, z in microns
327 // same segmentation on x
329 ix = (Int_t)(x/dpx + 1);
330 // different segmentation on z
331 iz = (Int_t)(ColFromZ(z) + 1);
334 if (iz > fNpz) iz= fNpz;
335 if (ix > fNpx) ix= fNpx;
337 if (iz < -fNpz) iz= -fNpz;
338 if (ix < -fNpx) ix=-fNpx;
342 //------------------------------
343 void AliITSsegmentationSPD::GetPadTxz(Float_t &x,Float_t &z) const{
344 // local transformation of real local coordinates (x,z)
347 // expects x, z in microns
349 // same segmentation on x
356 //------------------------------
357 void AliITSsegmentationSPD::GetPadCxz(Int_t ix,Int_t iz,Float_t &x,Float_t&z) const {
358 // Transform from pixel to real local coordinates
360 // returns x, z in microns
364 x = (ix>0) ? Float_t(ix*dpx)-dpx/2. : Float_t(ix*dpx)+dpx/2.;
369 //------------------------------
370 void AliITSsegmentationSPD::
371 Neighbours(Int_t iX, Int_t iZ, Int_t* Nlist, Int_t Xlist[8], Int_t Zlist[8]) const {
372 // returns the neighbouring pixels for use in Cluster Finders and the like.
374 *Nlist=4;Xlist[0]=Xlist[1]=iX;Xlist[2]=iX-1;Xlist[3]=iX+1;
375 Zlist[0]=iZ-1;Zlist[1]=iZ+1;Zlist[2]=Zlist[3]=iZ;
380 Xlist[0]=Xlist[1]=iX;
385 Zlist[2]=Zlist[3]=iZ;
400 //______________________________________________________________________
401 Bool_t AliITSsegmentationSPD::LocalToDet(Float_t x,Float_t z,
402 Int_t &ix,Int_t &iz) const {
403 // Transformation from Geant detector centered local coordinates (cm) to
404 // Pixel cell numbers ix and iz.
406 // Float_t x detector local coordinate x in cm with respect to
407 // the center of the sensitive volume.
408 // Float_t z detector local coordinate z in cm with respect to
409 // the center of the sensitive volulme.
411 // Int_t ix detector x cell coordinate. Has the range
413 // Int_t iz detector z cell coordinate. Has the range
416 // kTRUE if point x,z is inside sensitive volume, kFALSE otherwise.
417 // A value of -1 for ix or iz indecates that this point is outside of the
418 // detector segmentation as defined.
421 const Float_t kconv = 1.0E-04; // converts microns to cm.
423 dx = -0.5*kconv*Dx();
424 dz = -0.5*kconv*Dz();
427 if(x<dx) return kFALSE; // outside x range.
428 if(z<dz) return kFALSE; // outside z range.
429 for(i=0;i<Npx();i++){
430 dx += kconv*fCellSizeX[i];
433 if(i>=Npx()) return kFALSE; // outside x range.
434 for(j=0;j<Npz();j++){
435 dz += kconv*fCellSizeZ[j];
438 if(j>=Npz()) return kFALSE; // outside z range.
441 return kTRUE; // Found ix and iz, return.
443 //______________________________________________________________________
444 void AliITSsegmentationSPD::DetToLocal(Int_t ix,Int_t iz,Float_t &x,Float_t &z) const
446 // Transformation from Detector cell coordiantes to Geant detector centerd
447 // local coordinates (cm).
449 // Int_t ix detector x cell coordinate. Has the range 0<=ix<fNpx.
450 // Int_t iz detector z cell coordinate. Has the range 0<=iz<fNpz.
452 // Float_t x detector local coordinate x in cm with respect to the
453 // center of the sensitive volume.
454 // Float_t z detector local coordinate z in cm with respect to the
455 // center of the sensitive volulme.
456 // If ix and or iz is outside of the segmentation range a value of -0.5*Dx()
457 // or -0.5*Dz() is returned.
459 const Float_t kconv = 1.0E-04; // converts microns to cm.
461 x = -0.5*kconv*Dx(); // default value.
462 z = -0.5*kconv*Dz(); // default value.
463 if(ix<0 || ix>=Npx()) return; // outside of detector
464 if(iz<0 || iz>=Npz()) return; // outside of detctor
465 for(i=0;i<ix;i++) x += kconv*fCellSizeX[i]; // sum up to cell ix-1
466 x += 0.5*kconv*fCellSizeX[ix]; // add 1/2 of cell ix for center location.
467 for(j=0;j<iz;j++) z += kconv*fCellSizeZ[j]; // sum up cell iz-1
468 z += 0.5*kconv*fCellSizeZ[iz]; // add 1/2 of cell iz for center location.
469 return; // Found x and z, return.
471 //______________________________________________________________________
472 void AliITSsegmentationSPD::CellBoundries(Int_t ix,Int_t iz,
473 Double_t &xl,Double_t &xu,
474 Double_t &zl,Double_t &zu) const
476 // Transformation from Detector cell coordiantes to Geant detector centerd
477 // local coordinates (cm).
479 // Int_t ix detector x cell coordinate. Has the range 0<=ix<fNpx.
480 // Int_t iz detector z cell coordinate. Has the range 0<=iz<fNpz.
482 // Double_t xl detector local coordinate cell lower bounds x in cm
483 // with respect to the center of the sensitive volume.
484 // Double_t xu detector local coordinate cell upper bounds x in cm
485 // with respect to the center of the sensitive volume.
486 // Double_t zl detector local coordinate lower bounds z in cm with
487 // respect to the center of the sensitive volulme.
488 // Double_t zu detector local coordinate upper bounds z in cm with
489 // respect to the center of the sensitive volulme.
490 // If ix and or iz is outside of the segmentation range a value of -0.5*Dx()
491 // and -0.5*Dx() or -0.5*Dz() and -0.5*Dz() are returned.
493 const Float_t kconv = 1.0E-04; // converts microns to cm.
496 xl = xu = x = -0.5*kconv*Dx(); // default value.
497 zl = zu = z = -0.5*kconv*Dz(); // default value.
498 if(ix<0 || ix>=Npx()) return; // outside of detector
499 if(iz<0 || iz>=Npz()) return; // outside of detctor
500 for(i=0;i<ix;i++) x += kconv*fCellSizeX[i]; // sum up to cell ix-1
502 x += kconv*fCellSizeX[ix];
504 for(j=0;j<iz;j++) z += kconv*fCellSizeZ[j]; // sum up cell iz-1
506 z += kconv*fCellSizeZ[iz];
508 return; // Found x and z, return.
510 //----------------------------------------------------------------------
511 Int_t AliITSsegmentationSPD::GetChipFromChannel(Int_t, Int_t iz) const {
512 // returns chip number (in range 0-4) starting from channel number
513 if(iz>=fNpz || iz<0 ){
514 AliWarning("Bad cell number");
517 Int_t theChip=iz/fgkNcolumnsPerChip;
520 //----------------------------------------------------------------------
521 Int_t AliITSsegmentationSPD::GetChipFromLocal(Float_t, Float_t zloc) const {
522 // returns chip number (in range 0-4) starting from local coordinates
524 if (!LocalToDet(0,zloc,ix0,iz)) {
525 AliWarning("Bad local coordinate");
528 return GetChipFromChannel(ix0,iz);
530 //----------------------------------------------------------------------
531 Int_t AliITSsegmentationSPD::GetChipsInLocalWindow(Int_t* array, Float_t zmin, Float_t zmax, Float_t, Float_t) const {
532 // returns the number of chips containing a road defined by given local coordinate limits
534 const Float_t kconv = 1.0E-04; // converts microns to cm.
537 AliWarning("Bad coordinate limits: zmin>zmax!");
543 Float_t zminDet = -0.5*kconv*Dz();
544 Float_t zmaxDet = 0.5*kconv*Dz();
545 if(zmin<zminDet) zmin=zminDet;
546 if(zmax>zmaxDet) zmax=zmaxDet;
548 Int_t n1 = GetChipFromLocal(0,zmin);
549 array[nChipInW] = n1;
552 Int_t n2 = GetChipFromLocal(0,zmax);
555 Int_t imin=TMath::Min(n1,n2);
556 Int_t imax=TMath::Max(n1,n2);
557 for(Int_t ichip=imin; ichip<=imax; ichip++){
558 if(ichip==n1) continue;
559 array[nChipInW]=ichip;
566 //----------------------------------------------------------------------