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57817f7c | 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 | **************************************************************************/ | |
88cb7938 | 15 | |
57817f7c | 16 | /* $Id$ */ |
17 | ||
b0f5e3fc | 18 | #include <stdio.h> |
8a00af9a | 19 | #include <stdlib.h> |
4ae5bbc4 | 20 | #include <Riostream.h> |
b0f5e3fc | 21 | #include <TObjArray.h> |
84541af4 | 22 | #include <TParticle.h> |
1ca7869b | 23 | #include <TRandom.h> |
fd61217e | 24 | #include <TMath.h> |
84541af4 | 25 | #include <TH1.h> |
b0f5e3fc | 26 | |
fd61217e | 27 | #include "AliITSmodule.h" |
57817f7c | 28 | #include "AliITSMapA2.h" |
c7a4dac0 | 29 | #include "AliITSpList.h" |
9e8d6423 | 30 | #include "AliITSresponseSSD.h" |
c7a4dac0 | 31 | #include "AliITSsegmentationSSD.h" |
b0f5e3fc | 32 | #include "AliITSdcsSSD.h" |
33 | #include "AliITS.h" | |
3a97c582 | 34 | #include "AliITShit.h" |
ee86d557 | 35 | #include "AliITSdigit.h" |
b0f5e3fc | 36 | #include "AliRun.h" |
0315d466 | 37 | #include "AliITSgeom.h" |
57817f7c | 38 | #include "AliITSsimulationSSD.h" |
84541af4 | 39 | #include "AliITSTableSSD.h" |
b0f5e3fc | 40 | |
41 | ClassImp(AliITSsimulationSSD); | |
fd61217e | 42 | //////////////////////////////////////////////////////////////////////// |
43 | // Version: 0 | |
44 | // Written by Enrico Fragiacomo | |
45 | // July 2000 | |
46 | // | |
47 | // AliITSsimulationSSD is the simulation of SSDs. | |
48 | ||
57817f7c | 49 | //---------------------------------------------------------------------- |
50 | AliITSsimulationSSD::AliITSsimulationSSD(){ | |
84541af4 | 51 | //default Constructor |
57817f7c | 52 | |
84541af4 | 53 | fDCS = 0; |
54 | fDifConst[0] = fDifConst[1] = 0.0; | |
55 | fDriftVel[0] = fDriftVel[1] = 0.0; | |
56 | fMapA2 = 0; | |
3a97c582 | 57 | // fpList = 0; |
57817f7c | 58 | } |
0315d466 | 59 | //---------------------------------------------------------------------- |
b0f5e3fc | 60 | AliITSsimulationSSD::AliITSsimulationSSD(AliITSsegmentation *seg, |
61 | AliITSresponse *resp){ | |
3a97c582 | 62 | // Constructor |
63 | // Input: | |
64 | // AliITSsegmentationSSD *seg Pointer to the SSD segmentation to be used | |
65 | // AliITSresponseSSD *resp Pointer to the SSD responce class to be used | |
66 | // Outputs: | |
67 | // none. | |
68 | // Return | |
69 | // none. | |
70 | ||
71 | fDCS = 0; | |
72 | fDifConst[0] = fDifConst[1] = 0.0; | |
73 | fDriftVel[0] = fDriftVel[1] = 0.0; | |
74 | fMapA2 = 0; | |
75 | // fpList = 0; | |
76 | Init((AliITSsegmentationSSD*)seg,(AliITSresponseSSD*)resp); | |
c7a4dac0 | 77 | } |
78 | //---------------------------------------------------------------------- | |
79 | void AliITSsimulationSSD::Init(AliITSsegmentationSSD *seg, | |
84541af4 | 80 | AliITSresponseSSD *resp){ |
3a97c582 | 81 | // Inilizer, Inilizes all of the variable as needed in a standard place. |
82 | // Input: | |
83 | // AliITSsegmentationSSD *seg Pointer to the SSD segmentation to be used | |
84 | // AliITSresponseSSD *resp Pointer to the SSD responce class to be used | |
85 | // Outputs: | |
86 | // none. | |
87 | // Return | |
88 | // none. | |
89 | ||
90 | fSegmentation = seg; | |
91 | fResponse = resp; | |
92 | Float_t noise[2] = {0.,0.}; | |
93 | fResponse->GetNoiseParam(noise[0],noise[1]); // retrieves noise parameters | |
94 | fDCS = new AliITSdcsSSD(seg,resp); | |
95 | ||
96 | SetDriftVelocity(); // use default values in .h file | |
97 | SetIonizeE(); // use default values in .h file | |
98 | SetDiffConst(); // use default values in .h file | |
99 | fpList = new AliITSpList(2,GetNStrips()); | |
100 | fMapA2 = new AliITSMapA2(fSegmentation); | |
b0f5e3fc | 101 | } |
0315d466 | 102 | //______________________________________________________________________ |
57817f7c | 103 | AliITSsimulationSSD& AliITSsimulationSSD::operator=( |
3a97c582 | 104 | const AliITSsimulationSSD &s){ |
84541af4 | 105 | // Operator = |
106 | ||
107 | if(this==&s) return *this; | |
108 | ||
109 | this->fDCS = new AliITSdcsSSD(*(s.fDCS)); | |
110 | this->fMapA2 = s.fMapA2; | |
111 | this->fIonE = s.fIonE; | |
112 | this->fDifConst[0] = s.fDifConst[0]; | |
113 | this->fDifConst[1] = s.fDifConst[1]; | |
114 | this->fDriftVel[0] = s.fDriftVel[0]; | |
115 | this->fDriftVel[1] = s.fDriftVel[1]; | |
116 | return *this; | |
b0f5e3fc | 117 | } |
57817f7c | 118 | //______________________________________________________________________ |
119 | AliITSsimulationSSD::AliITSsimulationSSD(const AliITSsimulationSSD &source){ | |
84541af4 | 120 | // copy constructor |
fd61217e | 121 | |
84541af4 | 122 | *this = source; |
b0f5e3fc | 123 | } |
0315d466 | 124 | //______________________________________________________________________ |
b0f5e3fc | 125 | AliITSsimulationSSD::~AliITSsimulationSSD() { |
84541af4 | 126 | // destructor |
127 | delete fMapA2; | |
128 | delete fDCS; | |
0315d466 | 129 | } |
57817f7c | 130 | //______________________________________________________________________ |
3a97c582 | 131 | void AliITSsimulationSSD::InitSimulationModule(Int_t module,Int_t event){ |
132 | // Creates maps to build the list of tracks for each sumable digit | |
133 | // Inputs: | |
134 | // Int_t module // Module number to be simulated | |
135 | // Int_t event // Event number to be simulated | |
136 | // Outputs: | |
137 | // none. | |
138 | // Return | |
139 | // none. | |
140 | ||
141 | fModule = module; | |
142 | fEvent = event; | |
143 | fMapA2->ClearMap(); | |
144 | fpList->ClearMap(); | |
145 | } | |
146 | //______________________________________________________________________ | |
147 | void AliITSsimulationSSD::FinishSDigitiseModule(){ | |
148 | // Does the Sdigits to Digits work | |
149 | // Inputs: | |
150 | // none. | |
151 | // Outputs: | |
152 | // none. | |
153 | // Return: | |
154 | // none. | |
155 | ||
156 | FillMapFrompList(fpList); // need to check if needed here or not???? | |
157 | SDigitToDigit(fModule,fpList); | |
158 | fpList->ClearMap(); | |
159 | fMapA2->ClearMap(); | |
160 | } | |
161 | //______________________________________________________________________ | |
c7a4dac0 | 162 | void AliITSsimulationSSD::DigitiseModule(AliITSmodule *mod, |
84541af4 | 163 | Int_t dummy0,Int_t dummy1) { |
164 | // Digitizes hits for one SSD module | |
165 | Int_t module = mod->GetIndex(); | |
0315d466 | 166 | |
3a97c582 | 167 | HitsToAnalogDigits(mod,fpList); |
168 | SDigitToDigit(module,fpList); | |
0315d466 | 169 | |
3a97c582 | 170 | fpList->ClearMap(); |
84541af4 | 171 | fMapA2->ClearMap(); |
c7a4dac0 | 172 | } |
173 | //______________________________________________________________________ | |
174 | void AliITSsimulationSSD::SDigitiseModule(AliITSmodule *mod,Int_t dummy0, | |
84541af4 | 175 | Int_t dummy1) { |
3a97c582 | 176 | // Produces Summable/Analog digits and writes them to the SDigit tree. |
c7a4dac0 | 177 | |
3a97c582 | 178 | HitsToAnalogDigits(mod,fpList); |
c7a4dac0 | 179 | |
3a97c582 | 180 | WriteSDigits(fpList); |
c7a4dac0 | 181 | |
3a97c582 | 182 | fpList->ClearMap(); |
84541af4 | 183 | fMapA2->ClearMap(); |
c7a4dac0 | 184 | } |
185 | //______________________________________________________________________ | |
186 | void AliITSsimulationSSD::SDigitToDigit(Int_t module,AliITSpList *pList){ | |
84541af4 | 187 | // Takes the pList and finishes the digitization. |
fc2bd64b | 188 | |
84541af4 | 189 | // FillMapFrompList(pList); //commented out to avoid double counting of the |
fc2bd64b | 190 | //charge |
c7a4dac0 | 191 | |
84541af4 | 192 | ApplyNoise(pList,module); |
193 | ApplyCoupling(pList,module); | |
c7a4dac0 | 194 | |
84541af4 | 195 | ChargeToSignal(pList); |
c7a4dac0 | 196 | } |
197 | //______________________________________________________________________ | |
198 | void AliITSsimulationSSD::HitsToAnalogDigits(AliITSmodule *mod, | |
84541af4 | 199 | AliITSpList *pList){ |
3a97c582 | 200 | // Loops over all hits to produce Analog/floating point digits. This |
201 | // is also the first task in producing standard digits. | |
202 | Int_t lasttrack = -2; | |
203 | Int_t idtrack = -2; | |
204 | Double_t x0=0.0, y0=0.0, z0=0.0; | |
205 | Double_t x1=0.0, y1=0.0, z1=0.0; | |
206 | Double_t de=0.0; | |
207 | Int_t module = mod->GetIndex(); | |
208 | ||
209 | TObjArray *hits = mod->GetHits(); | |
210 | Int_t nhits = hits->GetEntriesFast(); | |
211 | if (nhits<=0) return; | |
212 | AliITSTableSSD * tav = new AliITSTableSSD(GetNStrips()); | |
213 | module = mod->GetIndex(); | |
214 | if ( mod->GetLayer() == 6 ) GetSegmentation()->SetLayer(6); | |
215 | if ( mod->GetLayer() == 5 ) GetSegmentation()->SetLayer(5); | |
216 | for(Int_t i=0; i<nhits; i++) { | |
0315d466 | 217 | // LineSegmentL returns 0 if the hit is entering |
218 | // If hits is exiting returns positions of entering and exiting hits | |
219 | // Returns also energy loss | |
3a97c582 | 220 | // cout << i << " "; |
221 | // cout << mod->GetHit(i)->GetXL() << " "<<mod->GetHit(i)->GetYL(); | |
222 | // cout << " " << mod->GetHit(i)->GetZL(); | |
223 | // cout << endl; | |
0315d466 | 224 | if (mod->LineSegmentL(i, x0, x1, y0, y1, z0, z1, de, idtrack)) { |
3a97c582 | 225 | HitToDigit(module, x0, y0, z0, x1, y1, z1, de,tav); |
226 | if (lasttrack != idtrack || i==(nhits-1)) { | |
227 | GetList(idtrack,i,module,pList,tav); | |
228 | } // end if | |
229 | lasttrack=idtrack; | |
0315d466 | 230 | } // end if |
3a97c582 | 231 | } // end loop over hits |
232 | delete tav; tav=0; | |
233 | return; | |
b0f5e3fc | 234 | } |
0315d466 | 235 | //---------------------------------------------------------------------- |
fd61217e | 236 | void AliITSsimulationSSD::HitToDigit(Int_t module, Double_t x0, Double_t y0, |
84541af4 | 237 | Double_t z0, Double_t x1, Double_t y1, |
238 | Double_t z1, Double_t de, | |
239 | AliITSTableSSD *tav) { | |
3a97c582 | 240 | // Turns hits in SSD module into one or more digits. |
241 | Float_t tang[2] = {0.0,0.0}; | |
242 | GetSegmentation()->Angles(tang[0], tang[1]);//stereo<<->tan(stereo)~=stereo | |
243 | Double_t x, y, z; | |
244 | Double_t dex=0.0, dey=0.0, dez=0.0; | |
245 | Double_t pairs; // pair generation energy per step. | |
246 | Double_t sigma[2] = {0.,0.};// standard deviation of the diffusion gaussian | |
247 | Double_t tdrift[2] = {0.,0.}; // time of drift | |
248 | Double_t w; | |
249 | Double_t inf[2], sup[2], par0[2]; | |
250 | ||
251 | // Steps in the module are determined "manually" (i.e. No Geant) | |
252 | // NumOfSteps divide path between entering and exiting hits in steps | |
253 | Int_t numOfSteps = NumOfSteps(x1, y1, z1, dex, dey, dez); | |
254 | // Enery loss is equally distributed among steps | |
255 | de = de/numOfSteps; | |
256 | pairs = de/GetIonizeE(); // e-h pairs generated | |
257 | for(Int_t j=0; j<numOfSteps; j++) { // stepping | |
0315d466 | 258 | x = x0 + (j+0.5)*dex; |
259 | y = y0 + (j+0.5)*dey; | |
57817f7c | 260 | if ( y > (GetSegmentation()->Dy()/2+10)*1.0E-4 ) { |
3a97c582 | 261 | // check if particle is within the detector |
262 | Warning("HitToDigit","hit out of detector y0=%e,y=%e,dey=%e,j =%e", | |
263 | y0,y,dey,j); | |
264 | return; | |
0315d466 | 265 | } // end if |
266 | z = z0 + (j+0.5)*dez; | |
3a97c582 | 267 | // cout <<"HitToDigit "<<x<<" "<<y<<" "<<z<< " "<<dex<<" "<<dey<<" "<<dez<<endl; |
0315d466 | 268 | // calculate drift time |
269 | // y is the minimum path | |
57817f7c | 270 | tdrift[0] = (y+(GetSegmentation()->Dy()*1.0E-4)/2)/GetDriftVelocity(0); |
271 | tdrift[1] = ((GetSegmentation()->Dy()*1.0E-4)/2-y)/GetDriftVelocity(1); | |
0315d466 | 272 | |
273 | for(Int_t k=0; k<2; k++) { // both sides remember: 0=Pside 1=Nside | |
274 | ||
3a97c582 | 275 | tang[k]=TMath::Tan(tang[k]); |
0315d466 | 276 | |
3a97c582 | 277 | // w is the coord. perpendicular to the strips |
1c67ee11 | 278 | /* |
3a97c582 | 279 | if(k==0) { |
57817f7c | 280 | w = (x+(GetSegmentation()->Dx()*1.0E-4)/2) - |
3a97c582 | 281 | (z+(GetSegmentation()->Dz()*1.0E-4)/2)*tang[k]; |
282 | }else{ | |
57817f7c | 283 | w = (x+(GetSegmentation()->Dx()*1.0E-4)/2) + |
3a97c582 | 284 | (z-(GetSegmentation()->Dz()*1.0E-4)/2)*tang[k]; |
285 | } // end if | |
286 | w /= (GetStripPitch()*1.0E-4); // w is converted in units of pitch | |
1c67ee11 | 287 | */ |
288 | { // replacement block for the above. | |
20c9e0e2 | 289 | Float_t xp=x*1.e+4,zp=z*1.e+4; // microns |
1c67ee11 | 290 | GetSegmentation()->GetPadTxz(xp,zp); |
291 | if(k==0) w = xp; // P side strip number | |
292 | else w = zp; // N side strip number | |
293 | } // end test block | |
0315d466 | 294 | |
3a97c582 | 295 | if((w<(-0.5)) || (w>(GetNStrips()-0.5))) { |
0315d466 | 296 | // this check rejects hits in regions not covered by strips |
297 | // 0.5 takes into account boundaries | |
20c9e0e2 | 298 | //cout << "x,z="<<x<<","<<z<<" w="<<w<<" Nstrips="<<GetNStrips()<<endl; |
82136bec | 299 | return; // There are dead region on the SSD sensitive volume. |
3a97c582 | 300 | } // end if |
0315d466 | 301 | |
3a97c582 | 302 | // sigma is the standard deviation of the diffusion gaussian |
303 | if(tdrift[k]<0) return; | |
304 | sigma[k] = TMath::Sqrt(2*GetDiffConst(k)*tdrift[k]); | |
305 | sigma[k] /= (GetStripPitch()*1.0E-4); //units of Pitch | |
306 | if(sigma[k]==0.0) { | |
b5456f1c | 307 | Error("HitToDigit"," sigma[%d]=0",k); |
0315d466 | 308 | exit(0); |
3a97c582 | 309 | } // end if |
310 | ||
311 | par0[k] = pairs; | |
312 | // we integrate the diffusion gaussian from -3sigma to 3sigma | |
313 | inf[k] = w - 3*sigma[k]; // 3 sigma from the gaussian average | |
314 | sup[k] = w + 3*sigma[k]; // 3 sigma from the gaussian average | |
315 | // IntegrateGaussian does the actual | |
316 | // integration of diffusion gaussian | |
317 | IntegrateGaussian(k, par0[k], w, sigma[k], inf[k], sup[k],tav); | |
0315d466 | 318 | } // end for loop over side (0=Pside, 1=Nside) |
3a97c582 | 319 | } // end stepping |
b0f5e3fc | 320 | } |
57817f7c | 321 | //______________________________________________________________________ |
c7a4dac0 | 322 | void AliITSsimulationSSD::ApplyNoise(AliITSpList *pList,Int_t module){ |
84541af4 | 323 | // Apply Noise. |
324 | Int_t k,ix; | |
325 | Double_t signal,noise; | |
326 | Double_t noiseP[2] = {0.,0.}; | |
327 | Float_t a,b; | |
328 | ||
329 | fResponse->GetNoiseParam(a,b); // retrieves noise parameters | |
330 | noiseP[0] = (Double_t) a; noiseP[1] = (Double_t) b; | |
331 | for(k=0;k<2;k++){ // both sides (0=Pside, 1=Nside) | |
c7a4dac0 | 332 | for(ix=0;ix<GetNStrips();ix++){ // loop over strips |
3a97c582 | 333 | noise = gRandom->Gaus(0,noiseP[k]);// get noise to signal |
334 | signal = noise + fMapA2->GetSignal(k,ix);//get signal from map | |
335 | if(signal<0.) signal=0.0; // in case noise is negative... | |
336 | fMapA2->SetHit(k,ix,signal); // give back signal to map | |
337 | if(signal>0.0) pList->AddNoise(k,ix,module,noise); | |
0315d466 | 338 | } // loop over strip |
84541af4 | 339 | } // loop over k (P or N side) |
b0f5e3fc | 340 | } |
0315d466 | 341 | //______________________________________________________________________ |
c7a4dac0 | 342 | void AliITSsimulationSSD::ApplyCoupling(AliITSpList *pList,Int_t module) { |
84541af4 | 343 | // Apply the effect of electronic coupling between channels |
344 | Int_t ix; | |
345 | Double_t signalLeft=0, signalRight=0,signal=0; | |
0315d466 | 346 | |
84541af4 | 347 | for(ix=0;ix<GetNStrips();ix++){ |
c7a4dac0 | 348 | // P side coupling |
57817f7c | 349 | if(ix>0.)signalLeft = fMapA2->GetSignal(0,ix-1)*fDCS->GetCouplingPL(); |
0315d466 | 350 | else signalLeft = 0.0; |
c7a4dac0 | 351 | if(ix<(GetNStrips()-1)) signalRight = fMapA2->GetSignal(0,ix+1)* |
84541af4 | 352 | fDCS->GetCouplingPR(); |
0315d466 | 353 | else signalRight = 0.0; |
c7a4dac0 | 354 | signal = signalLeft + signalRight; |
355 | fMapA2->AddSignal(0,ix,signal); | |
356 | if(signal>0.0) pList->AddNoise(0,ix,module,signal); | |
357 | ||
358 | signalLeft = signalRight = signal = 0.0; | |
359 | // N side coupling | |
57817f7c | 360 | if(ix>0.) signalLeft = fMapA2->GetSignal(1,ix-1)*fDCS->GetCouplingNL(); |
0315d466 | 361 | else signalLeft = 0.0; |
c7a4dac0 | 362 | if(ix<(GetNStrips()-1)) signalRight = fMapA2->GetSignal(1,ix+1)* |
84541af4 | 363 | fDCS->GetCouplingNR(); |
0315d466 | 364 | else signalRight = 0.0; |
c7a4dac0 | 365 | signal = signalLeft + signalRight; |
366 | fMapA2->AddSignal(1,ix,signal); | |
367 | if(signal>0.0) pList->AddNoise(1,ix,module,signal); | |
84541af4 | 368 | } // loop over strips |
b0f5e3fc | 369 | } |
0315d466 | 370 | //______________________________________________________________________ |
fd61217e | 371 | Float_t AliITSsimulationSSD::F(Float_t av, Float_t x, Float_t s) { |
84541af4 | 372 | // Computes the integral of a gaussian using Error Function |
373 | Float_t sqrt2 = TMath::Sqrt(2.0); | |
374 | Float_t sigm2 = sqrt2*s; | |
375 | Float_t integral; | |
fd61217e | 376 | |
84541af4 | 377 | integral = 0.5 * TMath::Erf( (x - av) / sigm2); |
378 | return integral; | |
0315d466 | 379 | } |
380 | //______________________________________________________________________ | |
fd61217e | 381 | void AliITSsimulationSSD::IntegrateGaussian(Int_t k,Double_t par, Double_t w, |
84541af4 | 382 | Double_t sigma, |
383 | Double_t inf, Double_t sup, | |
384 | AliITSTableSSD *tav) { | |
385 | // integrate the diffusion gaussian | |
386 | // remind: inf and sup are w-3sigma and w+3sigma | |
387 | // we could define them here instead of passing them | |
388 | // this way we are free to introduce asimmetry | |
389 | ||
390 | Double_t a=0.0, b=0.0; | |
391 | Double_t dXCharge1 = 0.0, dXCharge2 = 0.0; | |
392 | // dXCharge1 and 2 are the charge to two neighbouring strips | |
393 | // Watch that we only involve at least two strips | |
394 | // Numbers greater than 2 of strips in a cluster depend on | |
395 | // geometry of the track and delta rays, not charge diffusion! | |
fd61217e | 396 | |
84541af4 | 397 | Double_t strip = TMath::Floor(w); // closest strip on the left |
0315d466 | 398 | |
84541af4 | 399 | if ( TMath::Abs((strip - w)) < 0.5) { |
3a97c582 | 400 | // gaussian mean is closer to strip on the left |
401 | a = inf; // integration starting point | |
402 | if((strip+0.5)<=sup) { | |
403 | // this means that the tail of the gaussian goes beyond | |
404 | // the middle point between strips ---> part of the signal | |
405 | // is given to the strip on the right | |
406 | b = strip + 0.5; // integration stopping point | |
407 | dXCharge1 = F( w, b, sigma) - F(w, a, sigma); | |
408 | dXCharge2 = F( w, sup, sigma) - F(w ,b, sigma); | |
409 | }else { | |
410 | // this means that all the charge is given to the strip on the left | |
411 | b = sup; | |
412 | dXCharge1 = 0.9973; // gaussian integral at 3 sigmas | |
413 | dXCharge2 = 0.0; | |
414 | } // end if | |
415 | dXCharge1 = par * dXCharge1;// normalize by mean of number of carriers | |
416 | dXCharge2 = par * dXCharge2; | |
417 | ||
418 | // for the time being, signal is the charge | |
419 | // in ChargeToSignal signal is converted in ADC channel | |
420 | fMapA2->AddSignal(k,(Int_t)strip,dXCharge1); | |
421 | tav->Add(k,(Int_t)strip); | |
422 | if(((Int_t) strip) < (GetNStrips()-1)) { | |
423 | // strip doesn't have to be the last (remind: last=GetNStrips()-1) | |
424 | // otherwise part of the charge is lost | |
425 | fMapA2->AddSignal(k,((Int_t)strip+1),dXCharge2); | |
426 | tav->Add(k,((Int_t)(strip+1))); | |
427 | } // end if | |
84541af4 | 428 | }else{ |
3a97c582 | 429 | // gaussian mean is closer to strip on the right |
430 | strip++; // move to strip on the rigth | |
431 | b = sup; // now you know where to stop integrating | |
432 | if((strip-0.5)>=inf) { | |
433 | // tail of diffusion gaussian on the left goes left of | |
434 | // middle point between strips | |
435 | a = strip - 0.5; // integration starting point | |
436 | dXCharge1 = F(w, b, sigma) - F(w, a, sigma); | |
437 | dXCharge2 = F(w, a, sigma) - F(w, inf, sigma); | |
438 | }else { | |
439 | a = inf; | |
440 | dXCharge1 = 0.9973; // gaussian integral at 3 sigmas | |
441 | dXCharge2 = 0.0; | |
442 | } // end if | |
443 | dXCharge1 = par * dXCharge1; // normalize by means of carriers | |
444 | dXCharge2 = par * dXCharge2; | |
445 | // for the time being, signal is the charge | |
446 | // in ChargeToSignal signal is converted in ADC channel | |
447 | fMapA2->AddSignal(k,(Int_t)strip,dXCharge1); | |
448 | tav->Add(k,(Int_t)strip); | |
449 | if(((Int_t) strip) > 0) { | |
450 | // strip doesn't have to be the first | |
451 | // otherwise part of the charge is lost | |
452 | fMapA2->AddSignal(k,((Int_t)strip-1),dXCharge2); | |
453 | tav->Add(k,((Int_t)(strip-1))); | |
454 | } // end if | |
84541af4 | 455 | } // end if |
b0f5e3fc | 456 | } |
0315d466 | 457 | //______________________________________________________________________ |
fd61217e | 458 | Int_t AliITSsimulationSSD::NumOfSteps(Double_t x, Double_t y, Double_t z, |
84541af4 | 459 | Double_t & dex,Double_t & dey,Double_t & dez){ |
460 | // number of steps | |
461 | // it also returns steps for each coord | |
462 | //AliITSsegmentationSSD *seg = new AliITSsegmentationSSD(); | |
fd61217e | 463 | |
84541af4 | 464 | Double_t step = 25E-4; |
465 | //step = (Double_t) seg->GetStepSize(); // step size (cm) | |
466 | Int_t numOfSteps = (Int_t) (TMath::Sqrt(x*x+y*y+z*z)/step); | |
fd61217e | 467 | |
84541af4 | 468 | if (numOfSteps < 1) numOfSteps = 1; // one step, at least |
fd61217e | 469 | |
3a97c582 | 470 | // we could condition the stepping depending on the incident angle |
471 | // of the track | |
84541af4 | 472 | dex = x/numOfSteps; |
473 | dey = y/numOfSteps; | |
474 | dez = z/numOfSteps; | |
b0f5e3fc | 475 | |
84541af4 | 476 | return numOfSteps; |
fd61217e | 477 | } |
0315d466 | 478 | //---------------------------------------------------------------------- |
c7a4dac0 | 479 | void AliITSsimulationSSD::GetList(Int_t label,Int_t hit,Int_t mod, |
84541af4 | 480 | AliITSpList *pList,AliITSTableSSD *tav) { |
481 | // loop over nonzero digits | |
482 | Int_t ix,i; | |
483 | Double_t signal=0.; | |
484 | ||
485 | for(Int_t k=0; k<2; k++) { | |
486 | ix=tav->Use(k); | |
487 | while(ix>-1){ | |
488 | signal = fMapA2->GetSignal(k,ix); | |
489 | if(signal==0.0) { | |
490 | ix=tav->Use(k); | |
491 | continue; | |
3a97c582 | 492 | } // end if signal==0.0 |
84541af4 | 493 | // check the signal magnitude |
494 | for(i=0;i<pList->GetNSignals(k,ix);i++){ | |
495 | signal -= pList->GetTSignal(k,ix,i); | |
3a97c582 | 496 | } // end for i |
84541af4 | 497 | // compare the new signal with already existing list |
498 | if(signal>0)pList->AddSignal(k,ix,label,hit,mod,signal); | |
499 | ix=tav->Use(k); | |
3a97c582 | 500 | } // end of loop on strips |
84541af4 | 501 | } // end of loop on P/N side |
502 | tav->Clear(); | |
fd61217e | 503 | } |
0315d466 | 504 | //---------------------------------------------------------------------- |
c7a4dac0 | 505 | void AliITSsimulationSSD::ChargeToSignal(AliITSpList *pList) { |
84541af4 | 506 | // charge to signal |
507 | static AliITS *aliITS = (AliITS*)gAlice->GetModule("ITS"); | |
508 | Float_t threshold = 0.; | |
ee86d557 | 509 | Int_t size = AliITSdigitSSD::GetNTracks(); |
5c5273c2 | 510 | Int_t * digits = new Int_t[size]; |
511 | Int_t * tracks = new Int_t[size]; | |
512 | Int_t * hits = new Int_t[size]; | |
513 | Int_t j1; | |
84541af4 | 514 | Float_t charges[3] = {0.0,0.0,0.0}; |
515 | Float_t signal; | |
516 | Float_t noise[2] = {0.,0.}; | |
0315d466 | 517 | |
84541af4 | 518 | ((AliITSresponseSSD*)fResponse)->GetNoiseParam(noise[0],noise[1]); |
0315d466 | 519 | |
84541af4 | 520 | for(Int_t k=0;k<2;k++){ // both sides (0=Pside, 1=Nside) |
0315d466 | 521 | // Threshold for zero-suppression |
522 | // It can be defined in AliITSresponseSSD | |
523 | // threshold = (Float_t)fResponse->MinVal(k); | |
524 | // I prefer to think adjusting the threshold "manually", looking | |
525 | // at the scope, and considering noise standard deviation | |
c7a4dac0 | 526 | threshold = 4.0*noise[k]; // 4 times noise is a choice |
527 | for(Int_t ix=0;ix<GetNStrips();ix++){ // loop over strips | |
3a97c582 | 528 | if(fMapA2->GetSignal(k,ix) <= threshold)continue; |
529 | // convert to ADC signal | |
530 | signal = ((AliITSresponseSSD*)fResponse)->DEvToADC( | |
84541af4 | 531 | fMapA2->GetSignal(k,ix)); |
3a97c582 | 532 | if(signal>1024.) signal = 1024.;//if exceeding, accumulate last one |
533 | digits[0] = k; | |
534 | digits[1] = ix; | |
535 | digits[2] = (Int_t) signal; | |
ee86d557 | 536 | for(j1=0;j1<size;j1++)if(j1<pList->GetNEnteries()){ |
537 | // only three in digit. | |
c7a4dac0 | 538 | tracks[j1] = pList->GetTrack(k,ix,j1); |
539 | hits[j1] = pList->GetHit(k,ix,j1); | |
ee86d557 | 540 | }else{ |
541 | tracks[j1] = -3; | |
542 | hits[j1] = -1; | |
3a97c582 | 543 | } // end for j1 |
544 | // finally add digit | |
545 | aliITS->AddSimDigit(2,0,digits,tracks,hits,charges); | |
0315d466 | 546 | } // end for ix |
84541af4 | 547 | } // end for k |
5c5273c2 | 548 | delete [] digits; |
549 | delete [] tracks; | |
550 | delete [] hits; | |
c7a4dac0 | 551 | } |
552 | //______________________________________________________________________ | |
553 | void AliITSsimulationSSD::WriteSDigits(AliITSpList *pList){ | |
84541af4 | 554 | // Fills the Summable digits Tree |
555 | Int_t i,ni,j,nj; | |
556 | static AliITS *aliITS = (AliITS*)gAlice->GetModule("ITS"); | |
c7a4dac0 | 557 | |
84541af4 | 558 | pList->GetMaxMapIndex(ni,nj); |
559 | for(i=0;i<ni;i++)for(j=0;j<nj;j++){ | |
3a97c582 | 560 | if(pList->GetSignalOnly(i,j)>0.0){ |
561 | aliITS->AddSumDigit(*(pList->GetpListItem(i,j))); | |
562 | // cout << "pListSSD: " << *(pList->GetpListItem(i,j)) << endl; | |
563 | } // end if | |
84541af4 | 564 | } // end for i,j |
565 | return; | |
c7a4dac0 | 566 | } |
567 | //______________________________________________________________________ | |
568 | void AliITSsimulationSSD::FillMapFrompList(AliITSpList *pList){ | |
84541af4 | 569 | // Fills fMap2A from the pList of Summable digits |
570 | Int_t k,ix; | |
c7a4dac0 | 571 | |
84541af4 | 572 | for(k=0;k<2;k++)for(ix=0;ix<GetNStrips();ix++) |
c7a4dac0 | 573 | fMapA2->AddSignal(k,ix,pList->GetSignal(k,ix)); |
84541af4 | 574 | return; |
b0f5e3fc | 575 | } |
57817f7c | 576 | //______________________________________________________________________ |
577 | void AliITSsimulationSSD::Print(ostream *os){ | |
84541af4 | 578 | //Standard output format for this class |
579 | ||
580 | //AliITSsimulation::Print(os); | |
581 | *os << fIonE <<","; | |
582 | *os << fDifConst[0] <<","<< fDifConst[1] <<","; | |
583 | *os << fDriftVel[0] <<","<< fDriftVel[1]; | |
584 | //*os <<","; fDCS->Print(os); | |
585 | //*os <<","; fMapA2->Print(os); | |
57817f7c | 586 | } |
587 | //______________________________________________________________________ | |
588 | void AliITSsimulationSSD::Read(istream *is){ | |
84541af4 | 589 | // Standard output streaming function. |
590 | ||
591 | //AliITSsimulation::Read(is); | |
592 | *is >> fIonE; | |
593 | *is >> fDifConst[0] >> fDifConst[1]; | |
594 | *is >> fDriftVel[0] >> fDriftVel[1]; | |
595 | //fDCS->Read(is); | |
596 | //fMapA2->Read(is); | |
57817f7c | 597 | } |
598 | //______________________________________________________________________ | |
599 | ostream &operator<<(ostream &os,AliITSsimulationSSD &source){ | |
84541af4 | 600 | // Standard output streaming function. |
57817f7c | 601 | |
84541af4 | 602 | source.Print(&os); |
603 | return os; | |
57817f7c | 604 | } |
605 | //______________________________________________________________________ | |
606 | istream &operator>>(istream &os,AliITSsimulationSSD &source){ | |
84541af4 | 607 | // Standard output streaming function. |
57817f7c | 608 | |
84541af4 | 609 | source.Read(&os); |
610 | return os; | |
57817f7c | 611 | } |
c7a4dac0 | 612 | //______________________________________________________________________ |
84541af4 | 613 | |
614 | ||
615 | ||
616 | ||
617 |