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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 | **************************************************************************/ | |
15 | ||
16 | #include <TMath.h> | |
1ca7869b | 17 | #include <TF1.h> |
b0f5e3fc | 18 | |
19 | #include "AliITSsegmentationSPD.h" | |
1ca7869b | 20 | #include "AliITSgeom.h" |
b0f5e3fc | 21 | |
22 | ClassImp(AliITSsegmentationSPD) | |
23 | ||
24 | ||
25 | Float_t ColFromZ300(Float_t z) { | |
26 | // Get column number for each z-coordinate taking into account the | |
27 | // extra pixels in z direction assuming 300 micron sized pixels. | |
28 | Float_t col = 0.0; | |
29 | Float_t pitchz = 300.0; | |
30 | col = Float_t (z/pitchz); | |
31 | return col; | |
32 | } | |
33 | //_____________________________________________________________________________ | |
34 | Float_t ZFromCol300(Int_t col) { | |
35 | // same comments as above | |
36 | // Get z-coordinate for each colunm number | |
37 | Float_t pitchz = 300.0; | |
38 | Float_t z = 0.0; | |
39 | z = (col+0.5)*pitchz; | |
40 | return z; | |
41 | } | |
42 | //_____________________________________________________________________________ | |
43 | Float_t ZpitchFromCol300(Int_t col) { | |
44 | // returns Z pixel pitch for 300 micron pixels. | |
45 | return 300.0; | |
46 | } | |
47 | //_____________________________________________________________________________ | |
5752a110 | 48 | Float_t AliITSsegmentationSPD::ColFromZ(Float_t z) { |
b0f5e3fc | 49 | // hard-wired - keep it like this till we can parametrise |
50 | // and get rid of AliITSgeomSPD425 | |
51 | // Get column number for each z-coordinate taking into account the | |
52 | // extra pixels in z direction | |
53 | ||
54 | Float_t col = 0; | |
55 | Float_t pitchz = 425; | |
56 | if( z < 13175) { | |
57 | col = Float_t(z/pitchz); | |
58 | } else if( z < 14425) { | |
59 | pitchz = 625; | |
60 | col = 31 + (z - 13175)/pitchz; | |
61 | } else if( z < 27175) { | |
62 | col = 33 + (z - 14425)/pitchz; | |
63 | } else if( z < 28425) { | |
64 | pitchz = 625; | |
65 | col = 63 + (z - 27175)/pitchz; | |
66 | } else if( z < 41175) { | |
67 | col = 65 + (z - 28425)/pitchz; | |
68 | } else if( z < 42425) { | |
69 | pitchz = 625; | |
70 | col = 95 + (z - 41175)/pitchz; | |
71 | } else if( z < 55175) { | |
72 | col = 97 + (z - 42425)/pitchz; | |
73 | } else if( z < 56425) { | |
74 | pitchz = 625; | |
75 | col = 127 + (z - 55175)/pitchz; | |
76 | } else if( z < 69175) { | |
77 | col = 129 + (z - 56425)/pitchz; | |
78 | } else if( z < 70425) { | |
79 | pitchz = 625; | |
80 | col = 159 + (z - 69175)/pitchz; | |
81 | } else if( z < 83600) { | |
82 | col = 161 + (z - 70425)/pitchz; | |
83 | } | |
e8189707 | 84 | return TMath::Abs(col); |
b0f5e3fc | 85 | } |
86 | ||
87 | //_____________________________________________________________________________ | |
5752a110 | 88 | Float_t AliITSsegmentationSPD::ZFromCol(Int_t col) { |
b0f5e3fc | 89 | // same comments as above |
90 | // Get z-coordinate for each colunm number | |
91 | ||
92 | Float_t pitchz = 425; | |
93 | Float_t z = 0; | |
94 | if( col >=0 && col <= 30 ) { | |
95 | z = (col + 0.5)*pitchz; | |
96 | } else if( col >= 31 && col <= 32) { | |
97 | pitchz = 625; | |
98 | z = 13175 + (col -31 + 0.5)*pitchz; | |
99 | } else if( col >= 33 && col <= 62) { | |
100 | z = 14425 + (col -33 + 0.5)*pitchz; | |
101 | } else if( col >= 63 && col <= 64) { | |
102 | pitchz = 625; | |
103 | z = 27175 + (col -63 + 0.5)*pitchz; | |
104 | } else if( col >= 65 && col <= 94) { | |
105 | z = 28425 + (col -65 + 0.5)*pitchz; | |
106 | } else if( col >= 95 && col <= 96) { | |
107 | pitchz = 625; | |
108 | z = 41175 + (col -95 + 0.5)*pitchz; | |
109 | } else if( col >= 97 && col <= 126) { | |
110 | z = 42425 + (col -97 + 0.5)*pitchz; | |
111 | } else if( col >= 127 && col <= 128) { | |
112 | pitchz = 625; | |
113 | z = 55175 + (col -127 + 0.5)*pitchz; | |
114 | } else if( col >= 129 && col <= 158) { | |
115 | z = 56425 + (col -129 + 0.5)*pitchz; | |
116 | } else if( col >= 159 && col <= 160) { | |
117 | pitchz = 625; | |
118 | z = 69175 + (col -159 + 0.5)*pitchz; | |
119 | } else if( col >= 161 && col <= 191) { | |
120 | z = 70425 + (col -161 + 0.5)*pitchz; | |
5752a110 | 121 | } |
b0f5e3fc | 122 | |
123 | return z; | |
124 | } | |
5752a110 | 125 | //______________________________________________________________________ |
126 | Float_t AliITSsegmentationSPD::ZpitchFromCol(Int_t col) { | |
b0f5e3fc | 127 | // Get pitch size in z direction for each colunm |
128 | ||
5752a110 | 129 | Float_t pitchz = 425; |
130 | if(col < 0){ | |
131 | pitchz = 0.0; | |
132 | } else if(col >= 31 && col <= 32) { | |
133 | pitchz = 625; | |
134 | } else if(col >= 63 && col <= 64) { | |
135 | pitchz = 625; | |
136 | } else if(col >= 95 && col <= 96) { | |
137 | pitchz = 625; | |
138 | } else if(col >= 127 && col <= 128) { | |
139 | pitchz = 625; | |
140 | } else if(col >= 159 && col <= 160) { | |
141 | pitchz = 625; | |
142 | } else if(col>=192){ | |
143 | pitchz = 0.0; | |
144 | } | |
145 | return pitchz; | |
b0f5e3fc | 146 | } |
5752a110 | 147 | //______________________________________________________________________ |
b0f5e3fc | 148 | AliITSsegmentationSPD::AliITSsegmentationSPD(){ |
149 | // Default constructor | |
150 | fNpx = 0; | |
151 | fNpz = 0; | |
152 | fCorr=0; | |
153 | fGeom = 0; | |
154 | ||
155 | } | |
5752a110 | 156 | //______________________________________________________________________ |
b0f5e3fc | 157 | AliITSsegmentationSPD::AliITSsegmentationSPD(AliITSgeom *gm){ |
158 | // Constructor | |
159 | fCorr=0; | |
160 | fNpx = 0; | |
161 | fNpz = 0; | |
162 | Init(); | |
163 | fGeom = gm; | |
164 | ||
165 | } | |
5752a110 | 166 | //______________________________________________________________________ |
b0f5e3fc | 167 | AliITSsegmentationSPD& AliITSsegmentationSPD::operator=(AliITSsegmentationSPD &source){ |
168 | // = operator | |
b0f5e3fc | 169 | if(this==&source) return *this; |
170 | this->fNpx = source.fNpx; | |
171 | this->fNpz = source.fNpz; | |
172 | this->fDx = source.fDx; | |
173 | this->fDy = source.fDy; | |
e8189707 | 174 | Int_t i; |
b0f5e3fc | 175 | for(i=0;i<256;i++) this->fCellSizeX[i] = source.fCellSizeX[i]; |
176 | for(i=0;i<280;i++) this->fCellSizeZ[i] = source.fCellSizeZ[i]; | |
177 | this->fCorr = new TF1(*(source.fCorr));// make a proper copy of the function | |
178 | this->fGeom = source.fGeom; // copy only the pointers. | |
179 | return *this; | |
180 | } | |
181 | //____________________________________________________________________________ | |
182 | AliITSsegmentationSPD::AliITSsegmentationSPD(AliITSsegmentationSPD &source){ | |
183 | // copy constructor | |
184 | *this = source; | |
185 | } | |
186 | //------------------------------ | |
187 | void AliITSsegmentationSPD::Init300(){ | |
188 | // Initialize infromation for 6 read out chip 300X50 micron pixel SPD | |
189 | // detectors. This chip is 150 microns thick by 1.28 cm in x by 8.37 cm | |
190 | // long. It has 256 50 micron pixels in x and 279 300 micron size | |
191 | // pixels in z. | |
192 | ||
b0f5e3fc | 193 | //const Float_t kconv=10000.; |
e8189707 | 194 | Int_t i; |
b0f5e3fc | 195 | fNpx = 256; // The number of X pixel Cell same as in fCellSizeX array size |
196 | fNpz = 279; // The number of Z pixel Cell same as in fCellSizeZ array size | |
197 | for(i=0;i<fNpx;i++) fCellSizeX[i] = 50.0; // microns all the same | |
198 | for(i=0;i<fNpz;i++) fCellSizeZ[i] = ZpitchFromCol300(i); // microns | |
199 | for(i=fNpz;i<280;i++) fCellSizeZ[i] = 0.0; // zero out rest of array | |
200 | fDx = 0; | |
201 | for(i=0;i<fNpx;i++) fDx += fCellSizeX[i]; | |
202 | fDz = 0; | |
203 | for(i=0;i<fNpz;i++) fDz += fCellSizeZ[i]; | |
204 | fDy = 300.0; //microns SPD sensitive layer thickness | |
205 | } | |
206 | ||
207 | //------------------------------ | |
208 | void AliITSsegmentationSPD::Init(){ | |
209 | // Initialize infromation for 6 read out chip 425X50 micron pixel SPD | |
210 | // detectors. This chip is 150 microns thick by 1.28 cm in x by 8.375 cm | |
211 | // long. It has 256 50 micron pixels in x and 197 mostly 425 micron size | |
212 | // pixels in z. The two pixels between each readout chip are 625 microns long. | |
213 | ||
b0f5e3fc | 214 | //const Float_t kconv=10000.; |
e8189707 | 215 | Int_t i; |
b0f5e3fc | 216 | fNpx = 256; // The number of X pixel Cell same as in fCellSizeX array size |
217 | fNpz = 192; // The number of Z pixel Cell same as in fCellSizeZ array size | |
218 | for(i=0;i<fNpx;i++) fCellSizeX[i] = 50.0; // microns all the same | |
219 | for(i=0;i<fNpz;i++) fCellSizeZ[i] = ZpitchFromCol(i); // microns | |
220 | for(i=fNpz;i<280;i++) fCellSizeZ[i] = 0.0; // zero out rest of array | |
221 | fDx = 0; | |
222 | for(i=0;i<fNpx;i++) fDx += fCellSizeX[i]; | |
223 | fDz = 0; | |
224 | for(i=0;i<fNpz;i++) fDz += fCellSizeZ[i]; | |
225 | fDy = 300.0; //microns SPD sensitive layer thickness | |
e8189707 | 226 | //printf(" AliITSsegmentationSPD - Init: fNpx fNpz fDx fDz %d %d %f %f\n",fNpx, fNpz, fDx, fDz); |
b0f5e3fc | 227 | |
228 | } | |
229 | //------------------------------ | |
e8189707 | 230 | void AliITSsegmentationSPD::SetNPads(Int_t p1, Int_t p2){ |
b0f5e3fc | 231 | // for SPD this function should be used ONLY when a beam test setup |
232 | // configuration is studied | |
233 | ||
234 | fNpx=p1; | |
235 | fNpz=p2; | |
236 | ||
237 | } | |
238 | //------------------------------ | |
239 | void AliITSsegmentationSPD::SetDetSize(Float_t p1, Float_t p2, Float_t p3){ | |
240 | // for SPD this function should be used ONLY when a beam test setup | |
241 | // configuration is studied | |
242 | ||
243 | fDx=p1; | |
244 | fDz=p2; | |
245 | fDy=p3; | |
246 | ||
247 | } | |
248 | //------------------------------ | |
249 | Float_t AliITSsegmentationSPD::Dpx(Int_t i){ | |
250 | //returs x pixel pitch for a give pixel | |
251 | return fCellSizeX[i]; | |
252 | } | |
253 | //------------------------------ | |
254 | Float_t AliITSsegmentationSPD::Dpz(Int_t i){ | |
255 | // returns z pixel pitch for a give pixel | |
256 | return ZpitchFromCol(i); | |
257 | } | |
258 | //------------------------------ | |
e8189707 | 259 | void AliITSsegmentationSPD::GetPadIxz(Float_t x,Float_t z,Int_t &ix,Int_t &iz){ |
b0f5e3fc | 260 | // Returns pixel coordinates (ix,iz) for given real local coordinates (x,z) |
261 | // | |
262 | ||
263 | // expects x, z in microns | |
264 | ||
265 | // same segmentation on x | |
266 | Float_t dpx=Dpx(0); | |
267 | ix = (Int_t)(x/dpx + 1); | |
268 | // different segmentation on z | |
269 | iz = (Int_t)(ColFromZ(z) + 1); | |
270 | ||
b0f5e3fc | 271 | |
272 | if (iz > fNpz) iz= fNpz; | |
273 | if (ix > fNpx) ix= fNpx; | |
b0f5e3fc | 274 | /* |
275 | if (iz < -fNpz) iz= -fNpz; | |
276 | if (ix < -fNpx) ix=-fNpx; | |
277 | */ | |
278 | } | |
279 | ||
280 | //------------------------------ | |
e8189707 | 281 | void AliITSsegmentationSPD::GetPadTxz(Float_t &x,Float_t &z){ |
282 | // local transformation of real local coordinates (x,z) | |
283 | // | |
284 | ||
285 | // expects x, z in microns | |
286 | ||
287 | // same segmentation on x | |
288 | Float_t dpx=Dpx(0); | |
289 | ||
290 | x /= dpx; | |
291 | z = ColFromZ(z); | |
292 | ||
293 | } | |
294 | //------------------------------ | |
295 | void AliITSsegmentationSPD::GetPadCxz(Int_t ix,Int_t iz,Float_t &x,Float_t&z){ | |
b0f5e3fc | 296 | // Transform from pixel to real local coordinates |
297 | ||
298 | // returns x, z in microns | |
299 | ||
300 | Float_t dpx=Dpx(0); | |
301 | ||
302 | x = (ix>0) ? Float_t(ix*dpx)-dpx/2. : Float_t(ix*dpx)+dpx/2.; | |
303 | z = ZFromCol(iz); | |
304 | ||
305 | ||
306 | } | |
307 | //------------------------------ | |
308 | void AliITSsegmentationSPD:: | |
309 | Neighbours(Int_t iX, Int_t iZ, Int_t* Nlist, Int_t Xlist[8], Int_t Zlist[8]){ | |
310 | // returns the neighbouring pixels for use in Cluster Finders and the like. | |
311 | /* | |
312 | *Nlist=4;Xlist[0]=Xlist[1]=iX;Xlist[2]=iX-1;Xlist[3]=iX+1; | |
313 | Zlist[0]=iZ-1;Zlist[1]=iZ+1;Zlist[2]=Zlist[3]=iZ; | |
314 | */ | |
315 | ||
316 | ||
317 | *Nlist=8; | |
318 | Xlist[0]=Xlist[1]=iX; | |
319 | Xlist[2]=iX-1; | |
320 | Xlist[3]=iX+1; | |
321 | Zlist[0]=iZ-1; | |
322 | Zlist[1]=iZ+1; | |
323 | Zlist[2]=Zlist[3]=iZ; | |
324 | ||
325 | // Diagonal elements | |
326 | Xlist[4]=iX+1; | |
327 | Zlist[4]=iZ+1; | |
328 | ||
329 | Xlist[5]=iX-1; | |
330 | Zlist[5]=iZ-1; | |
331 | ||
332 | Xlist[6]=iX-1; | |
333 | Zlist[6]=iZ+1; | |
334 | ||
335 | Xlist[7]=iX+1; | |
336 | Zlist[7]=iZ-1; | |
337 | } | |
5752a110 | 338 | //______________________________________________________________________ |
339 | void AliITSsegmentationSPD::LocalToDet(Float_t x,Float_t z,Int_t &ix,Int_t &iz){ | |
340 | // Transformation from Geant detector centered local coordinates (cm) to | |
341 | // Pixel cell numbers ix and iz. | |
342 | // Input: | |
343 | // Float_t x detector local coordinate x in cm with respect to the | |
344 | // center of the sensitive volume. | |
345 | // Float_t z detector local coordinate z in cm with respect to the | |
346 | // center of the sensitive volulme. | |
347 | // Output: | |
348 | // Int_t ix detector x cell coordinate. Has the range 0<=ix<fNpx. | |
349 | // Int_t iz detector z cell coordinate. Has the range 0<=iz<fNpz. | |
350 | // A value of -1 for ix or iz indecates that this point is outside of the | |
351 | // detector segmentation as defined. | |
352 | Int_t i,j; | |
353 | Float_t dx,dz; | |
354 | const Float_t kconv = 1.0E-04; // converts microns to cm. | |
355 | ||
356 | dx = -0.5*kconv*Dx(); | |
357 | dz = -0.5*kconv*Dz(); | |
358 | ix = -1; | |
359 | iz = -1; | |
360 | if(x<dx) return; // outside x range. | |
361 | if(z<dz) return; // outside z range. | |
362 | for(i=0;i<Npx();i++){ | |
363 | dx += kconv*fCellSizeX[i]; | |
364 | if(x<dx) break; | |
365 | } // end for i | |
366 | if(i>=Npx()) return; // outside x range. | |
367 | for(j=0;j<Npz();j++){ | |
368 | dz += kconv*fCellSizeZ[j]; | |
369 | if(z<dz) break; | |
370 | } // end for j | |
371 | if(j>=Npz()) return; // outside z range. | |
372 | ix = i; | |
373 | iz = j; | |
374 | return; // Found ix and iz, return. | |
375 | } | |
376 | //______________________________________________________________________ | |
377 | void AliITSsegmentationSPD::DetToLocal(Int_t ix,Int_t iz,Float_t &x,Float_t &z) | |
378 | { | |
379 | // Transformation from Detector cell coordiantes to Geant detector centerd | |
380 | // local coordinates (cm). | |
381 | // Input: | |
382 | // Int_t ix detector x cell coordinate. Has the range 0<=ix<fNpx. | |
383 | // Int_t iz detector z cell coordinate. Has the range 0<=iz<fNpz. | |
384 | // Output: | |
385 | // Float_t x detector local coordinate x in cm with respect to the | |
386 | // center of the sensitive volume. | |
387 | // Float_t z detector local coordinate z in cm with respect to the | |
388 | // center of the sensitive volulme. | |
389 | // If ix and or iz is outside of the segmentation range a value of -0.5*Dx() | |
390 | // or -0.5*Dz() is returned. | |
391 | Int_t i,j; | |
392 | const Float_t kconv = 1.0E-04; // converts microns to cm. | |
393 | ||
394 | x = -0.5*kconv*Dx(); // default value. | |
395 | z = -0.5*kconv*Dz(); // default value. | |
396 | if(ix<0 || ix>=Npx()) return; // outside of detector | |
397 | if(iz<0 || iz>=Npz()) return; // outside of detctor | |
398 | for(i=0;i<ix;i++) x += kconv*fCellSizeX[i]; // sum up to cell ix-1 | |
399 | x += 0.5*kconv*fCellSizeX[ix]; // add 1/2 of cell ix for center location. | |
400 | for(j=0;j<iz;j++) z += kconv*fCellSizeZ[j]; // sum up cell iz-1 | |
401 | z += 0.5*kconv*fCellSizeZ[iz]; // add 1/2 of cell iz for center location. | |
402 | return; // Found x and z, return. | |
403 | } |