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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 | **************************************************************************/ | |
179578b2 | 15 | /* |
16 | $Log$ | |
4ae5bbc4 | 17 | Revision 1.15 2001/05/16 14:57:16 alibrary |
18 | New files for folders and Stack | |
19 | ||
9e1a0ddb | 20 | Revision 1.14 2001/05/14 06:21:49 barbera |
21 | Some unuseful printout commented | |
22 | ||
66da7685 | 23 | Revision 1.13 2001/05/14 05:44:11 barbera |
24 | Version 1.11 reput in place to avoid problem with reconstruction | |
25 | ||
179578b2 | 26 | Revision 1.11 2001/05/03 16:12:37 nilsen |
27 | Fixed up LocalToDet, DetToLocal, GetCrossing, GetPadTxz to work with different | |
28 | angles in layer 5 and 6. | |
29 | ||
30 | Revision 1.10 2001/05/01 22:42:22 nilsen | |
31 | Update of SSD simulation and reconstruction code by Boris and Enrico. | |
32 | ||
33 | Revision 1.9 2001/04/27 14:16:50 nilsen | |
34 | Remove dead and/or unused code and printout lines. i.e. cleaned it up a bit. | |
35 | ||
36 | */ | |
b0f5e3fc | 37 | |
38 | #include <TMath.h> | |
1ca7869b | 39 | #include <TF1.h> |
4ae5bbc4 | 40 | #include <Riostream.h> |
b0f5e3fc | 41 | #include "AliITSsegmentationSSD.h" |
42 | #include "AliITSgeom.h" | |
9e1a0ddb | 43 | #include "AliRun.h" |
44 | #include "AliModule.h" | |
fd61217e | 45 | |
b0f5e3fc | 46 | ClassImp(AliITSsegmentationSSD) |
47 | AliITSsegmentationSSD::AliITSsegmentationSSD(){ | |
179578b2 | 48 | // default constructor |
49 | fGeom = 0; | |
50 | fCorr = 0; | |
51 | fLayer = 0; | |
b0f5e3fc | 52 | } |
179578b2 | 53 | //---------------------------------------------------------------------- |
b0f5e3fc | 54 | AliITSsegmentationSSD::AliITSsegmentationSSD(AliITSgeom *geom){ |
179578b2 | 55 | // constuctor |
56 | fGeom = geom; | |
57 | fCorr = 0; | |
58 | SetDetSize(); | |
59 | SetPadSize(); | |
60 | SetNPads(); | |
61 | SetAngles(); | |
62 | fLayer = 0; | |
b0f5e3fc | 63 | } |
179578b2 | 64 | //______________________________________________________________________ |
65 | AliITSsegmentationSSD& AliITSsegmentationSSD::operator=( | |
66 | AliITSsegmentationSSD &source){ | |
0315d466 | 67 | // Operator = |
179578b2 | 68 | if(this==&source) return *this; |
69 | this->fNstrips = source.fNstrips; | |
70 | this->fStereoP = source.fStereoP; | |
71 | this->fStereoN = source.fStereoN; | |
72 | this->fStereoPl5 = source.fStereoPl5; | |
73 | this->fStereoNl5 = source.fStereoNl5; | |
74 | this->fStereoPl6 = source.fStereoPl6; | |
75 | this->fStereoNl6 = source.fStereoNl6; | |
76 | this->fLayer = source.fLayer; | |
77 | this->fPitch = source.fPitch; | |
78 | this->fDz = source.fDz; | |
79 | this->fDx = source.fDx; | |
80 | this->fDy = source.fDy; | |
81 | this->fLayer = source.fLayer; | |
82 | this->fGeom = source.fGeom; // copy only the pointer | |
83 | this->fCorr = new TF1(*(source.fCorr)); // make a proper copy | |
84 | return *this; | |
b0f5e3fc | 85 | } |
179578b2 | 86 | //______________________________________________________________________ |
b0f5e3fc | 87 | AliITSsegmentationSSD::AliITSsegmentationSSD(AliITSsegmentationSSD &source){ |
179578b2 | 88 | // copy constructor |
89 | *this = source; | |
b0f5e3fc | 90 | } |
179578b2 | 91 | //---------------------------------------------------------------------- |
b0f5e3fc | 92 | void AliITSsegmentationSSD::Init(){ |
179578b2 | 93 | // standard initalizer |
b0f5e3fc | 94 | |
e8189707 | 95 | SetPadSize(); |
96 | SetNPads(); | |
b0f5e3fc | 97 | SetAngles(); |
179578b2 | 98 | } |
99 | //---------------------------------------------------------------------- | |
100 | void AliITSsegmentationSSD::Angles(Float_t &aP,Float_t &aN){ | |
0315d466 | 101 | |
179578b2 | 102 | if (fLayer == 5){ |
103 | aP = fStereoPl5; | |
104 | aN = fStereoNl5; | |
105 | } // end if | |
106 | if (fLayer == 6){ | |
107 | aP = fStereoPl6; | |
108 | aN = fStereoNl6; | |
109 | } // end if | |
0315d466 | 110 | } |
179578b2 | 111 | //---------------------------------------------------------------------- |
112 | void AliITSsegmentationSSD::SetLayer(Int_t l){ | |
0315d466 | 113 | |
179578b2 | 114 | if (l==5) fLayer =5; |
115 | if (l==6) fLayer =6; | |
116 | } | |
117 | //---------------------------------------------------------------------- | |
118 | void AliITSsegmentationSSD::GetPadTxz(Float_t &x,Float_t &z){ | |
119 | // returns P and N sided strip numbers for a given location. | |
120 | // Transformation from microns detector center local coordinates | |
121 | // to detector P and N side strip numbers.. | |
122 | /* _- Z | |
123 | + angle / ^ | |
124 | fNstrips v | N-Side ...0 | |
125 | \-------/------------|-----------\--------\ | |
126 | |\\\\\\/////////////.|\\\\\\\\\\\\\\\\\\\\| | |
127 | |0\\\\/////////////..|.\\\\\\\\\\\\\\\\\\\| | |
128 | |00\\/////////////...|..\\\\\\\\\\\\\\\\\\| | |
129 | X <--|000/////////////... |...\\\\\\\\\\\\\\\\\| | |
130 | |00/////////////... | ...\\\\\\\\\\\\\\\\| | |
131 | |0/////////////... | ...\\\\\\\\\\\\\\\| | |
132 | |//////////////... | ...\\\\\\\\\\\\\\\| | |
133 | /-----\--------------|--------------------/ | |
134 | fNstrips-1 P-Side ...0 | |
135 | |0\ | |
136 | |00\ | |
137 | Dead region: |000/ | |
138 | |00/ | |
139 | |0/ | |
140 | // expects x, z in microns | |
141 | */ | |
142 | Float_t StereoP, StereoN; | |
143 | Angles(StereoP,StereoN); | |
144 | Float_t tanP = TMath::Tan(StereoP); | |
145 | Float_t tanN = TMath::Tan(-StereoN); | |
146 | Float_t x1 = x; | |
147 | Float_t z1 = z; | |
148 | x1 += fDx/2; | |
149 | z1 += fDz/2; | |
150 | x = (x1 - z1*tanP)/fPitch; | |
151 | z = (x1 - tanN*(z1 - fDz))/fPitch; | |
152 | } | |
153 | //---------------------------------------------------------------------- | |
154 | void AliITSsegmentationSSD::GetPadIxz(Float_t x,Float_t z,Int_t &iP,Int_t &iN){ | |
0315d466 | 155 | // returns P and N sided strip numbers for a given location. |
179578b2 | 156 | /* _- Z |
157 | + angle / ^ | |
158 | fNstrips v | N-Side ...0 | |
159 | \-------/------------|-----------\--------\ | |
160 | |\\\\\\/////////////.|\\\\\\\\\\\\\\\\\\\\| | |
161 | |0\\\\/////////////..|.\\\\\\\\\\\\\\\\\\\| | |
162 | |00\\/////////////...|..\\\\\\\\\\\\\\\\\\| | |
163 | X <--|000/////////////... |...\\\\\\\\\\\\\\\\\| | |
164 | |00/////////////... | ...\\\\\\\\\\\\\\\\| | |
165 | |0/////////////... | ...\\\\\\\\\\\\\\\| | |
166 | |//////////////... | ...\\\\\\\\\\\\\\\| | |
167 | /-----\--------------|--------------------/ | |
168 | fNstrips-1 P-Side ...0 | |
169 | |0\ | |
170 | |00\ | |
171 | Dead region: |000/ | |
172 | |00/ | |
173 | |0/ | |
b0f5e3fc | 174 | |
175 | // expects x, z in microns | |
179578b2 | 176 | */ |
c1c63494 | 177 | |
0315d466 | 178 | Float_t StereoP, StereoN; |
179 | Angles(StereoP,StereoN); | |
180 | Float_t tanP=TMath::Tan(StereoP); | |
181 | Float_t tanN=TMath::Tan(StereoN); | |
182 | Float_t x1=x,z1=z; | |
183 | x1 += fDx/2; | |
184 | z1 += fDz/2; | |
185 | Float_t ldX = x1 - z1*tanP; // distance from left-down edge | |
186 | iP = (Int_t)(ldX/fPitch); | |
b0f5e3fc | 187 | iP = (iP<0)? -1: iP; |
188 | iP = (iP>fNstrips)? -1: iP; | |
0315d466 | 189 | |
190 | ldX = x1 - tanN*(fDz - z1); | |
191 | iN = (Int_t)(ldX/fPitch); | |
b0f5e3fc | 192 | iN = (iN<0)? -1: iN; |
193 | iN = (iN>fNstrips)? -1: iN; | |
0315d466 | 194 | |
b0f5e3fc | 195 | } |
0315d466 | 196 | //------------------------------------------------------- |
179578b2 | 197 | void AliITSsegmentationSSD::GetPadCxz(Int_t iP,Int_t iN,Float_t &x,Float_t &z){ |
198 | // actually this is the GetCrossing(Float_t &,Float_t &) | |
0315d466 | 199 | // returns local x, z in microns ! |
b0f5e3fc | 200 | |
179578b2 | 201 | Float_t Dx = fDx; // detector size in x direction, microns |
202 | Float_t Dz = fDz; // detector size in z direction, microns | |
203 | Float_t xP; // x coordinate in the P side from the first P strip | |
204 | Float_t xN; // x coordinate in the N side from the first N strip | |
205 | Float_t StereoP, StereoN; | |
206 | Angles(StereoP,StereoN); | |
207 | Float_t kP=TMath::Tan(StereoP); | |
208 | Float_t kN=TMath::Tan(StereoN); | |
b0f5e3fc | 209 | |
0315d466 | 210 | xP=iP*fPitch; |
211 | xN=iN*fPitch; | |
212 | x = xP + kP*(Dz*kN-xP+xN)/(kP+kN); | |
213 | z = (Dz*kN-xP+xN)/(kP+kN); | |
214 | x -= Dx/2; | |
215 | z -= Dz/2; | |
66da7685 | 216 | //if(TMath::Abs(z) > Dz/2) cout<<"Warning, wrong z local ="<<z<<endl; |
0315d466 | 217 | // Check that zL is inside the detector for the |
218 | // correspondent xP and xN coordinates | |
b0f5e3fc | 219 | |
220 | return; | |
221 | } | |
179578b2 | 222 | //______________________________________________________________________ |
223 | void AliITSsegmentationSSD::LocalToDet(Float_t x,Float_t z, | |
224 | Int_t &iP,Int_t &iN){ | |
225 | // Transformation from Geant cm detector center local coordinates | |
226 | // to detector P and N side strip numbers.. | |
227 | /* _- Z | |
228 | + angle / ^ | |
229 | fNstrips v | N-Side ...0 | |
230 | \-------/------------|-----------\--------\ | |
231 | |\\\\\\/////////////.|\\\\\\\\\\\\\\\\\\\\| | |
232 | |0\\\\/////////////..|.\\\\\\\\\\\\\\\\\\\| | |
233 | |00\\/////////////...|..\\\\\\\\\\\\\\\\\\| | |
234 | X <--|000/////////////... |...\\\\\\\\\\\\\\\\\| | |
235 | |00/////////////... | ...\\\\\\\\\\\\\\\\| | |
236 | |0/////////////... | ...\\\\\\\\\\\\\\\| | |
237 | |//////////////... | ...\\\\\\\\\\\\\\\| | |
238 | /-----\--------------|--------------------/ | |
239 | fNstrips-1 P-Side ...0 | |
240 | |0\ | |
241 | |00\ | |
242 | Dead region: |000/ | |
243 | |00/ | |
244 | |0/ | |
245 | */ | |
246 | const Double_t kconst = 1.0E-04; // convert microns to cm. | |
247 | ||
248 | x /= kconst; // convert to microns | |
249 | z /= kconst; // convert to microns | |
250 | this->GetPadTxz(x,z); | |
5752a110 | 251 | |
179578b2 | 252 | // first for P side |
253 | iP = (Int_t) x; | |
254 | if(iP<0 || iP>=fNstrips) iP=-1; // strip number must be in range. | |
255 | // Now for N side) | |
256 | iN = (Int_t) z; | |
257 | if(iN<0 || iN>=fNstrips) iN=-1; // strip number must be in range. | |
258 | return; | |
259 | } | |
260 | //---------------------------------------------------------------------- | |
261 | void AliITSsegmentationSSD::DetToLocal(Int_t ix,Int_t iPN, | |
262 | Float_t &x,Float_t &z){ | |
263 | // Transformation from detector segmentation/cell coordiantes starting | |
264 | // from 0. iPN=0 for P side and 1 for N side strip. Returned is z=0.0 | |
265 | // and the corresponding x value.. | |
266 | /* _- Z | |
267 | + angle / ^ | |
268 | fNstrips v | N-Side ...0 | |
269 | \-------/------------|-----------\--------\ | |
270 | |\\\\\\/////////////.|\\\\\\\\\\\\\\\\\\\\| | |
271 | |0\\\\/////////////..|.\\\\\\\\\\\\\\\\\\\| | |
272 | |00\\/////////////...|..\\\\\\\\\\\\\\\\\\| | |
273 | X <--|000/////////////... |...\\\\\\\\\\\\\\\\\| | |
274 | |00/////////////... | ...\\\\\\\\\\\\\\\\| | |
275 | |0/////////////... | ...\\\\\\\\\\\\\\\| | |
276 | |//////////////... | ...\\\\\\\\\\\\\\\| | |
277 | /-----\--------------|--------------------/ | |
278 | fNstrips-1 P-Side ...0 | |
279 | |0\ | |
280 | |00\ | |
281 | Dead region: |000/ | |
282 | |00/ | |
283 | |0/ | |
284 | */ | |
285 | // for strips p-side | |
286 | // x = a + b + z*tan(fStereoP); a = Dpx(iP)*(iP+0.5)-dx; b = dz*th; | |
287 | // for strips n-side | |
288 | // x = a + b + z*tan(fStereoP); a = Dpx(iN)*(iN+0.5)-dx; b = -dz*th; | |
289 | const Double_t kconst = 1.0E-04; // convert microns to cm. | |
290 | Float_t flag=kconst*Dx(); // error value | |
291 | Double_t th=0.0,dx,dz,i,a,b=0.0,xb[4],zb[4]; | |
292 | Float_t StereoP, StereoN; | |
293 | Angles(StereoP,StereoN); | |
5752a110 | 294 | |
179578b2 | 295 | z = 0.0; // Strip center in z. |
296 | if(iPN<0 || iPN>1){// if error return full detector size in x. | |
297 | x = z = flag; | |
298 | return; | |
299 | } // end if | |
300 | if(ix<0 || ix>=fNstrips) { // if error return full detector size in x. | |
301 | x = z = flag; | |
302 | return; | |
303 | } // end if | |
304 | i = (Double_t) ix; // convert to double | |
305 | dx = 0.5*kconst*Dx(); // half distance in x in cm | |
306 | dz = 0.5*kconst*Dz(); // half distance in z in cm | |
307 | a = kconst*Dpx(ix)*(i+0.5)-dx; // Min x value. | |
308 | if(iPN==0){ //P-side angle defined backwards. | |
309 | th = TMath::Tan(StereoP); | |
310 | b = dz*th; | |
311 | }else if(iPN==1){ // N-side | |
312 | th = TMath::Tan(-StereoN); | |
313 | b = -dz*th; | |
314 | } // end if | |
315 | // compute average/center position of the strip. | |
316 | xb[0] = +dx; if(th!=0.0) zb[0] = (+dx-a-b)/th; else zb[0] = 0.0; | |
317 | xb[1] = -dx; if(th!=0.0) zb[1] = (-dx-a-b)/th; else zb[1] = 0.0; | |
318 | xb[2] = a+b+dz*th; zb[2] = +dz; | |
319 | xb[3] = a+b-dz*th; zb[3] = -dz; | |
320 | x = 0.0; z = 0.0; | |
321 | for(Int_t j=0;j<4;j++){ | |
322 | if(xb[j]>=-dx && xb[j]<=dx && zb[j]>=-dz && zb[j]<=dz){ | |
323 | x += xb[j]; | |
324 | z += zb[j]; | |
325 | } // end if | |
326 | } // end for | |
327 | x *= 0.5; | |
328 | z *= 0.5; | |
329 | return; | |
330 | } | |
331 | //---------------------------------------------------------------------- | |
332 | Bool_t AliITSsegmentationSSD::GetCrossing(Int_t iP,Int_t iN, | |
333 | Float_t &x,Float_t &z, | |
334 | Float_t c[2][2]){ | |
335 | // Given one P side strip and one N side strip, Returns kTRUE if they | |
336 | // cross each other and the location of the two crossing strips and | |
337 | // their correxlation matrix c[2][2]. | |
338 | /* _- Z | |
339 | + angle / ^ | |
340 | fNstrips v | N-Side ...0 | |
341 | \-------/------------|-----------\--------\ | |
342 | |\\\\\\/////////////.|\\\\\\\\\\\\\\\\\\\\| | |
343 | |0\\\\/////////////..|.\\\\\\\\\\\\\\\\\\\| | |
344 | |00\\/////////////...|..\\\\\\\\\\\\\\\\\\| | |
345 | X <--|000/////////////... |...\\\\\\\\\\\\\\\\\| | |
346 | |00/////////////... | ...\\\\\\\\\\\\\\\\| | |
347 | |0/////////////... | ...\\\\\\\\\\\\\\\| | |
348 | |//////////////... | ...\\\\\\\\\\\\\\\| | |
349 | /-----\--------------|--------------------/ | |
350 | fNstrips-1 P-Side ...0 | |
351 | |0\ | |
352 | |00\ | |
353 | Dead region: |000/ | |
354 | |00/ | |
355 | |0/ | |
356 | c[2][2] is defined as follows | |
357 | /c[0][0] c[0][1]\ /delta iP\ = /delta x\ | |
358 | \c[1][0] c[1][1]/ \delta iN/ = \delta z/ | |
359 | */ | |
360 | const Double_t kconst = 1.0E-04; // convert microns to cm. | |
361 | Double_t thp,thn,th,dx,dz,p,ip,in; | |
362 | Float_t StereoP, StereoN; | |
363 | Angles(StereoP,StereoN); | |
364 | ||
365 | thp = TMath::Tan(StereoP); | |
366 | thn = TMath::Tan(-StereoN); | |
367 | th = thp-thn; | |
368 | if(th==0.0) { // parall strips then never cross. | |
369 | x = 0.0; | |
370 | z = 0.0; | |
371 | c[0][0] = c[1][0] = c[0][1] = c[1][1] = 0.0; | |
372 | return kFALSE; | |
373 | } // end if | |
374 | // The strips must cross some place in space. | |
375 | ip = (Double_t) iP; // convert to double now for speed | |
376 | in = (Double_t) iN; // convert to double now for speed | |
377 | dx = 0.5*kconst*Dx(); // half distance in x in cm | |
378 | dz = 0.5*kconst*Dz(); // half distance in z in cm | |
379 | p = kconst*Dpx(iP); // Get strip spacing/pitch now | |
380 | x = 0.5*p+dx + (p*(in*thp-ip*thn)-2.0*dz*thp*thn)/th; | |
381 | z =(p*(in-ip)-dz*(thp+thn))/th; | |
382 | // compute correlations. | |
383 | c[0][0] = -thn*p/th; // dx/diP | |
384 | c[1][1] = p/th; // dz/diN | |
385 | c[0][1] = p*thp/th; // dx/diN | |
386 | c[1][0] = -p/th; // dz/diP | |
387 | if(x<-dx || x>dx || z<-dz || z>dz) return kFALSE; // crossing is outside | |
388 | // of the detector so | |
389 | // these strips don't | |
390 | // cross. | |
391 | return kTRUE; | |
392 | } |