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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 | **************************************************************************/ | |
15 | /* $Id$ */ | |
16 | ||
b0f5e3fc | 17 | #include <stdio.h> |
8a00af9a | 18 | #include <stdlib.h> |
fd61217e | 19 | #include <iostream.h> |
57817f7c | 20 | #include <iomanip.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" | |
34 | #include "AliRun.h" | |
0315d466 | 35 | #include "AliITSgeom.h" |
57817f7c | 36 | #include "AliITSsimulationSSD.h" |
84541af4 | 37 | #include "AliITSTableSSD.h" |
b0f5e3fc | 38 | |
39 | ClassImp(AliITSsimulationSSD); | |
fd61217e | 40 | //////////////////////////////////////////////////////////////////////// |
41 | // Version: 0 | |
42 | // Written by Enrico Fragiacomo | |
43 | // July 2000 | |
44 | // | |
45 | // AliITSsimulationSSD is the simulation of SSDs. | |
46 | ||
57817f7c | 47 | //---------------------------------------------------------------------- |
48 | AliITSsimulationSSD::AliITSsimulationSSD(){ | |
84541af4 | 49 | //default Constructor |
57817f7c | 50 | |
84541af4 | 51 | fDCS = 0; |
52 | fDifConst[0] = fDifConst[1] = 0.0; | |
53 | fDriftVel[0] = fDriftVel[1] = 0.0; | |
54 | fMapA2 = 0; | |
57817f7c | 55 | } |
0315d466 | 56 | //---------------------------------------------------------------------- |
b0f5e3fc | 57 | AliITSsimulationSSD::AliITSsimulationSSD(AliITSsegmentation *seg, |
58 | AliITSresponse *resp){ | |
84541af4 | 59 | // Constructor |
b0f5e3fc | 60 | |
84541af4 | 61 | fDCS = 0; |
62 | fDifConst[0] = fDifConst[1] = 0.0; | |
63 | fDriftVel[0] = fDriftVel[1] = 0.0; | |
64 | fMapA2 = 0; | |
65 | Init((AliITSsegmentationSSD*)seg,(AliITSresponseSSD*)resp); | |
c7a4dac0 | 66 | } |
67 | //---------------------------------------------------------------------- | |
68 | void AliITSsimulationSSD::Init(AliITSsegmentationSSD *seg, | |
84541af4 | 69 | AliITSresponseSSD *resp){ |
70 | // Constructor | |
71 | ||
72 | fSegmentation = seg; | |
73 | fResponse = resp; | |
74 | Float_t noise[2] = {0.,0.}; | |
75 | fResponse->GetNoiseParam(noise[0],noise[1]); // retrieves noise parameters | |
76 | fDCS = new AliITSdcsSSD(seg,resp); | |
77 | ||
78 | SetDriftVelocity(); // use default values in .h file | |
79 | SetIonizeE(); // use default values in .h file | |
80 | SetDiffConst(); // use default values in .h file | |
81 | fMapA2 = new AliITSMapA2(fSegmentation); | |
82 | ||
b0f5e3fc | 83 | } |
0315d466 | 84 | //______________________________________________________________________ |
57817f7c | 85 | AliITSsimulationSSD& AliITSsimulationSSD::operator=( |
84541af4 | 86 | const AliITSsimulationSSD &s){ |
87 | // Operator = | |
88 | ||
89 | if(this==&s) return *this; | |
90 | ||
91 | this->fDCS = new AliITSdcsSSD(*(s.fDCS)); | |
92 | this->fMapA2 = s.fMapA2; | |
93 | this->fIonE = s.fIonE; | |
94 | this->fDifConst[0] = s.fDifConst[0]; | |
95 | this->fDifConst[1] = s.fDifConst[1]; | |
96 | this->fDriftVel[0] = s.fDriftVel[0]; | |
97 | this->fDriftVel[1] = s.fDriftVel[1]; | |
98 | return *this; | |
b0f5e3fc | 99 | } |
57817f7c | 100 | //______________________________________________________________________ |
101 | AliITSsimulationSSD::AliITSsimulationSSD(const AliITSsimulationSSD &source){ | |
84541af4 | 102 | // copy constructor |
fd61217e | 103 | |
84541af4 | 104 | *this = source; |
b0f5e3fc | 105 | } |
0315d466 | 106 | //______________________________________________________________________ |
b0f5e3fc | 107 | AliITSsimulationSSD::~AliITSsimulationSSD() { |
84541af4 | 108 | // destructor |
109 | delete fMapA2; | |
110 | delete fDCS; | |
0315d466 | 111 | } |
57817f7c | 112 | //______________________________________________________________________ |
c7a4dac0 | 113 | void AliITSsimulationSSD::DigitiseModule(AliITSmodule *mod, |
84541af4 | 114 | Int_t dummy0,Int_t dummy1) { |
115 | // Digitizes hits for one SSD module | |
116 | Int_t module = mod->GetIndex(); | |
117 | AliITSpList *pList = new AliITSpList(2,GetNStrips()); | |
0315d466 | 118 | |
84541af4 | 119 | HitsToAnalogDigits(mod,pList); |
120 | SDigitToDigit(module,pList); | |
0315d466 | 121 | |
84541af4 | 122 | delete pList; |
123 | fMapA2->ClearMap(); | |
c7a4dac0 | 124 | } |
125 | //______________________________________________________________________ | |
126 | void AliITSsimulationSSD::SDigitiseModule(AliITSmodule *mod,Int_t dummy0, | |
84541af4 | 127 | Int_t dummy1) { |
128 | // Produces Summable/Analog digits and writes them to the SDigit tree. | |
129 | AliITSpList *pList = new AliITSpList(2,GetNStrips()); | |
c7a4dac0 | 130 | |
84541af4 | 131 | HitsToAnalogDigits(mod,pList); |
c7a4dac0 | 132 | |
84541af4 | 133 | WriteSDigits(pList); |
c7a4dac0 | 134 | |
84541af4 | 135 | delete pList; |
136 | fMapA2->ClearMap(); | |
c7a4dac0 | 137 | } |
138 | //______________________________________________________________________ | |
139 | void AliITSsimulationSSD::SDigitToDigit(Int_t module,AliITSpList *pList){ | |
84541af4 | 140 | // Takes the pList and finishes the digitization. |
fc2bd64b | 141 | |
84541af4 | 142 | // FillMapFrompList(pList); //commented out to avoid double counting of the |
fc2bd64b | 143 | //charge |
c7a4dac0 | 144 | |
84541af4 | 145 | ApplyNoise(pList,module); |
146 | ApplyCoupling(pList,module); | |
c7a4dac0 | 147 | |
84541af4 | 148 | ChargeToSignal(pList); |
c7a4dac0 | 149 | } |
150 | //______________________________________________________________________ | |
151 | void AliITSsimulationSSD::HitsToAnalogDigits(AliITSmodule *mod, | |
84541af4 | 152 | AliITSpList *pList){ |
153 | // Loops over all hits to produce Analog/floating point digits. This | |
154 | // is also the first task in producing standard digits. | |
155 | Int_t lasttrack = -2; | |
156 | Int_t idtrack = -2; | |
157 | Double_t x0=0.0, y0=0.0, z0=0.0; | |
158 | Double_t x1=0.0, y1=0.0, z1=0.0; | |
159 | Double_t de=0.0; | |
160 | Int_t module = mod->GetIndex(); | |
161 | ||
162 | TObjArray *hits = mod->GetHits(); | |
163 | Int_t nhits = hits->GetEntriesFast(); | |
164 | if (nhits<=0) return; | |
165 | AliITSTableSSD * tav = new AliITSTableSSD(GetNStrips()); | |
166 | module = mod->GetIndex(); | |
167 | if ( mod->GetLayer() == 6 ) GetSegmentation()->SetLayer(6); | |
168 | if ( mod->GetLayer() == 5 ) GetSegmentation()->SetLayer(5); | |
169 | for(Int_t i=0; i<nhits; i++) { | |
0315d466 | 170 | // LineSegmentL returns 0 if the hit is entering |
171 | // If hits is exiting returns positions of entering and exiting hits | |
172 | // Returns also energy loss | |
173 | ||
174 | if (mod->LineSegmentL(i, x0, x1, y0, y1, z0, z1, de, idtrack)) { | |
84541af4 | 175 | HitToDigit(module, x0, y0, z0, x1, y1, z1, de,tav); |
176 | ||
177 | if (lasttrack != idtrack || i==(nhits-1)) { | |
178 | GetList(idtrack,i,module,pList,tav); | |
179 | } // end if | |
180 | lasttrack=idtrack; | |
0315d466 | 181 | } // end if |
84541af4 | 182 | } // end loop over hits |
183 | delete tav; tav=0; | |
184 | return; | |
b0f5e3fc | 185 | } |
0315d466 | 186 | //---------------------------------------------------------------------- |
fd61217e | 187 | void AliITSsimulationSSD::HitToDigit(Int_t module, Double_t x0, Double_t y0, |
84541af4 | 188 | Double_t z0, Double_t x1, Double_t y1, |
189 | Double_t z1, Double_t de, | |
190 | AliITSTableSSD *tav) { | |
191 | // Turns hits in SSD module into one or more digits. | |
192 | ||
193 | Float_t tang[2] = {0.0,0.0}; | |
194 | GetSegmentation()->Angles(tang[0], tang[1]);//stereo<<->tan(stereo)~=stereo | |
195 | Double_t x, y, z; | |
196 | Double_t dex=0.0, dey=0.0, dez=0.0; | |
197 | Double_t pairs; // pair generation energy per step. | |
198 | Double_t sigma[2] = {0.,0.};// standard deviation of the diffusion gaussian | |
199 | Double_t tdrift[2] = {0.,0.}; // time of drift | |
200 | Double_t w; | |
201 | Double_t inf[2], sup[2], par0[2]; | |
202 | ||
203 | // Steps in the module are determined "manually" (i.e. No Geant) | |
204 | // NumOfSteps divide path between entering and exiting hits in steps | |
205 | Int_t numOfSteps = NumOfSteps(x1, y1, z1, dex, dey, dez); | |
206 | // Enery loss is equally distributed among steps | |
207 | de = de/numOfSteps; | |
208 | pairs = de/GetIonizeE(); // e-h pairs generated | |
209 | for(Int_t j=0; j<numOfSteps; j++) { // stepping | |
0315d466 | 210 | x = x0 + (j+0.5)*dex; |
211 | y = y0 + (j+0.5)*dey; | |
57817f7c | 212 | if ( y > (GetSegmentation()->Dy()/2+10)*1.0E-4 ) { |
84541af4 | 213 | // check if particle is within the detector |
214 | Warning("HitToDigit","hit out of detector y0=%e,y=%e,dey=%e,j =%e", | |
215 | y0,y,dey,j); | |
216 | return; | |
0315d466 | 217 | } // end if |
218 | z = z0 + (j+0.5)*dez; | |
219 | ||
220 | // calculate drift time | |
221 | // y is the minimum path | |
57817f7c | 222 | tdrift[0] = (y+(GetSegmentation()->Dy()*1.0E-4)/2)/GetDriftVelocity(0); |
223 | tdrift[1] = ((GetSegmentation()->Dy()*1.0E-4)/2-y)/GetDriftVelocity(1); | |
0315d466 | 224 | |
225 | for(Int_t k=0; k<2; k++) { // both sides remember: 0=Pside 1=Nside | |
226 | ||
84541af4 | 227 | tang[k]=TMath::Tan(tang[k]); |
0315d466 | 228 | |
84541af4 | 229 | // w is the coord. perpendicular to the strips |
230 | if(k==0) { | |
57817f7c | 231 | w = (x+(GetSegmentation()->Dx()*1.0E-4)/2) - |
84541af4 | 232 | (z+(GetSegmentation()->Dz()*1.0E-4)/2)*tang[k]; |
233 | }else{ | |
57817f7c | 234 | w = (x+(GetSegmentation()->Dx()*1.0E-4)/2) + |
84541af4 | 235 | (z-(GetSegmentation()->Dz()*1.0E-4)/2)*tang[k]; |
236 | } // end if | |
237 | w /= (GetStripPitch()*1.0E-4); // w is converted in units of pitch | |
0315d466 | 238 | |
84541af4 | 239 | if((w<(-0.5)) || (w>(GetNStrips()-0.5))) { |
0315d466 | 240 | // this check rejects hits in regions not covered by strips |
241 | // 0.5 takes into account boundaries | |
82136bec | 242 | return; // There are dead region on the SSD sensitive volume. |
243 | /* | |
84541af4 | 244 | if(k==0) Warning("HitToDigit", |
245 | "no strip in this region of P side"); | |
246 | else Warning"HitToDigit","no strip in this region of N side"); | |
247 | return; | |
82136bec | 248 | */ |
84541af4 | 249 | } // end if |
0315d466 | 250 | |
84541af4 | 251 | // sigma is the standard deviation of the diffusion gaussian |
252 | if(tdrift[k]<0) return; | |
253 | sigma[k] = TMath::Sqrt(2*GetDiffConst(k)*tdrift[k]); | |
254 | sigma[k] /= (GetStripPitch()*1.0E-4); //units of Pitch | |
255 | if(sigma[k]==0.0) { | |
b5456f1c | 256 | Error("HitToDigit"," sigma[%d]=0",k); |
0315d466 | 257 | exit(0); |
84541af4 | 258 | } // end if |
259 | ||
260 | par0[k] = pairs; | |
261 | // we integrate the diffusion gaussian from -3sigma to 3sigma | |
262 | inf[k] = w - 3*sigma[k]; // 3 sigma from the gaussian average | |
263 | sup[k] = w + 3*sigma[k]; // 3 sigma from the gaussian average | |
264 | // IntegrateGaussian does the actual | |
265 | // integration of diffusion gaussian | |
266 | IntegrateGaussian(k, par0[k], w, sigma[k], inf[k], sup[k],tav); | |
0315d466 | 267 | } // end for loop over side (0=Pside, 1=Nside) |
84541af4 | 268 | } // end stepping |
269 | //delete seg; | |
b0f5e3fc | 270 | } |
57817f7c | 271 | //______________________________________________________________________ |
c7a4dac0 | 272 | void AliITSsimulationSSD::ApplyNoise(AliITSpList *pList,Int_t module){ |
84541af4 | 273 | // Apply Noise. |
274 | Int_t k,ix; | |
275 | Double_t signal,noise; | |
276 | Double_t noiseP[2] = {0.,0.}; | |
277 | Float_t a,b; | |
278 | ||
279 | fResponse->GetNoiseParam(a,b); // retrieves noise parameters | |
280 | noiseP[0] = (Double_t) a; noiseP[1] = (Double_t) b; | |
281 | for(k=0;k<2;k++){ // both sides (0=Pside, 1=Nside) | |
c7a4dac0 | 282 | for(ix=0;ix<GetNStrips();ix++){ // loop over strips |
84541af4 | 283 | noise = gRandom->Gaus(0,noiseP[k]);// get noise to signal |
284 | signal = noise + fMapA2->GetSignal(k,ix);//get signal from map | |
285 | if(signal<0.) signal=0.0; // in case noise is negative... | |
286 | fMapA2->SetHit(k,ix,signal); // give back signal to map | |
287 | if(signal>0.0) pList->AddNoise(k,ix,module,noise); | |
0315d466 | 288 | } // loop over strip |
84541af4 | 289 | } // loop over k (P or N side) |
b0f5e3fc | 290 | } |
0315d466 | 291 | //______________________________________________________________________ |
c7a4dac0 | 292 | void AliITSsimulationSSD::ApplyCoupling(AliITSpList *pList,Int_t module) { |
84541af4 | 293 | // Apply the effect of electronic coupling between channels |
294 | Int_t ix; | |
295 | Double_t signalLeft=0, signalRight=0,signal=0; | |
0315d466 | 296 | |
84541af4 | 297 | for(ix=0;ix<GetNStrips();ix++){ |
c7a4dac0 | 298 | // P side coupling |
57817f7c | 299 | if(ix>0.)signalLeft = fMapA2->GetSignal(0,ix-1)*fDCS->GetCouplingPL(); |
0315d466 | 300 | else signalLeft = 0.0; |
c7a4dac0 | 301 | if(ix<(GetNStrips()-1)) signalRight = fMapA2->GetSignal(0,ix+1)* |
84541af4 | 302 | fDCS->GetCouplingPR(); |
0315d466 | 303 | else signalRight = 0.0; |
c7a4dac0 | 304 | signal = signalLeft + signalRight; |
305 | fMapA2->AddSignal(0,ix,signal); | |
306 | if(signal>0.0) pList->AddNoise(0,ix,module,signal); | |
307 | ||
308 | signalLeft = signalRight = signal = 0.0; | |
309 | // N side coupling | |
57817f7c | 310 | if(ix>0.) signalLeft = fMapA2->GetSignal(1,ix-1)*fDCS->GetCouplingNL(); |
0315d466 | 311 | else signalLeft = 0.0; |
c7a4dac0 | 312 | if(ix<(GetNStrips()-1)) signalRight = fMapA2->GetSignal(1,ix+1)* |
84541af4 | 313 | fDCS->GetCouplingNR(); |
0315d466 | 314 | else signalRight = 0.0; |
c7a4dac0 | 315 | signal = signalLeft + signalRight; |
316 | fMapA2->AddSignal(1,ix,signal); | |
317 | if(signal>0.0) pList->AddNoise(1,ix,module,signal); | |
84541af4 | 318 | } // loop over strips |
b0f5e3fc | 319 | } |
0315d466 | 320 | //______________________________________________________________________ |
fd61217e | 321 | Float_t AliITSsimulationSSD::F(Float_t av, Float_t x, Float_t s) { |
84541af4 | 322 | // Computes the integral of a gaussian using Error Function |
323 | Float_t sqrt2 = TMath::Sqrt(2.0); | |
324 | Float_t sigm2 = sqrt2*s; | |
325 | Float_t integral; | |
fd61217e | 326 | |
84541af4 | 327 | integral = 0.5 * TMath::Erf( (x - av) / sigm2); |
328 | return integral; | |
0315d466 | 329 | } |
330 | //______________________________________________________________________ | |
fd61217e | 331 | void AliITSsimulationSSD::IntegrateGaussian(Int_t k,Double_t par, Double_t w, |
84541af4 | 332 | Double_t sigma, |
333 | Double_t inf, Double_t sup, | |
334 | AliITSTableSSD *tav) { | |
335 | // integrate the diffusion gaussian | |
336 | // remind: inf and sup are w-3sigma and w+3sigma | |
337 | // we could define them here instead of passing them | |
338 | // this way we are free to introduce asimmetry | |
339 | ||
340 | Double_t a=0.0, b=0.0; | |
341 | Double_t dXCharge1 = 0.0, dXCharge2 = 0.0; | |
342 | // dXCharge1 and 2 are the charge to two neighbouring strips | |
343 | // Watch that we only involve at least two strips | |
344 | // Numbers greater than 2 of strips in a cluster depend on | |
345 | // geometry of the track and delta rays, not charge diffusion! | |
fd61217e | 346 | |
84541af4 | 347 | Double_t strip = TMath::Floor(w); // closest strip on the left |
0315d466 | 348 | |
84541af4 | 349 | if ( TMath::Abs((strip - w)) < 0.5) { |
0315d466 | 350 | // gaussian mean is closer to strip on the left |
351 | a = inf; // integration starting point | |
352 | if((strip+0.5)<=sup) { | |
84541af4 | 353 | // this means that the tail of the gaussian goes beyond |
354 | // the middle point between strips ---> part of the signal | |
355 | // is given to the strip on the right | |
356 | b = strip + 0.5; // integration stopping point | |
357 | dXCharge1 = F( w, b, sigma) - F(w, a, sigma); | |
358 | dXCharge2 = F( w, sup, sigma) - F(w ,b, sigma); | |
0315d466 | 359 | }else { |
84541af4 | 360 | // this means that all the charge is given to the strip on the left |
361 | b = sup; | |
362 | dXCharge1 = 0.9973; // gaussian integral at 3 sigmas | |
363 | dXCharge2 = 0.0; | |
0315d466 | 364 | } // end if |
0315d466 | 365 | dXCharge1 = par * dXCharge1;// normalize by mean of number of carriers |
366 | dXCharge2 = par * dXCharge2; | |
367 | ||
368 | // for the time being, signal is the charge | |
369 | // in ChargeToSignal signal is converted in ADC channel | |
b48af428 | 370 | fMapA2->AddSignal(k,(Int_t)strip,dXCharge1); |
84541af4 | 371 | tav->Add(k,(Int_t)strip); |
c7a4dac0 | 372 | if(((Int_t) strip) < (GetNStrips()-1)) { |
84541af4 | 373 | // strip doesn't have to be the last (remind: last=GetNStrips()-1) |
374 | // otherwise part of the charge is lost | |
375 | fMapA2->AddSignal(k,((Int_t)strip+1),dXCharge2); | |
376 | tav->Add(k,((Int_t)(strip+1))); | |
0315d466 | 377 | } // end if |
fd61217e | 378 | |
0315d466 | 379 | |
84541af4 | 380 | }else{ |
0315d466 | 381 | // gaussian mean is closer to strip on the right |
382 | strip++; // move to strip on the rigth | |
383 | b = sup; // now you know where to stop integrating | |
384 | if((strip-0.5)>=inf) { | |
84541af4 | 385 | // tail of diffusion gaussian on the left goes left of |
386 | // middle point between strips | |
387 | a = strip - 0.5; // integration starting point | |
388 | dXCharge1 = F(w, b, sigma) - F(w, a, sigma); | |
389 | dXCharge2 = F(w, a, sigma) - F(w, inf, sigma); | |
0315d466 | 390 | }else { |
84541af4 | 391 | a = inf; |
392 | dXCharge1 = 0.9973; // gaussian integral at 3 sigmas | |
393 | dXCharge2 = 0.0; | |
0315d466 | 394 | } // end if |
0315d466 | 395 | dXCharge1 = par * dXCharge1; // normalize by means of carriers |
396 | dXCharge2 = par * dXCharge2; | |
397 | ||
398 | // for the time being, signal is the charge | |
399 | // in ChargeToSignal signal is converted in ADC channel | |
b48af428 | 400 | fMapA2->AddSignal(k,(Int_t)strip,dXCharge1); |
84541af4 | 401 | tav->Add(k,(Int_t)strip); |
0315d466 | 402 | if(((Int_t) strip) > 0) { |
84541af4 | 403 | // strip doesn't have to be the first |
404 | // otherwise part of the charge is lost | |
405 | fMapA2->AddSignal(k,((Int_t)strip-1),dXCharge2); | |
406 | tav->Add(k,((Int_t)(strip-1))); | |
0315d466 | 407 | } // end if |
fd61217e | 408 | |
84541af4 | 409 | |
410 | } // end if | |
b0f5e3fc | 411 | } |
0315d466 | 412 | //______________________________________________________________________ |
fd61217e | 413 | Int_t AliITSsimulationSSD::NumOfSteps(Double_t x, Double_t y, Double_t z, |
84541af4 | 414 | Double_t & dex,Double_t & dey,Double_t & dez){ |
415 | // number of steps | |
416 | // it also returns steps for each coord | |
417 | //AliITSsegmentationSSD *seg = new AliITSsegmentationSSD(); | |
fd61217e | 418 | |
84541af4 | 419 | Double_t step = 25E-4; |
420 | //step = (Double_t) seg->GetStepSize(); // step size (cm) | |
421 | Int_t numOfSteps = (Int_t) (TMath::Sqrt(x*x+y*y+z*z)/step); | |
fd61217e | 422 | |
84541af4 | 423 | if (numOfSteps < 1) numOfSteps = 1; // one step, at least |
fd61217e | 424 | |
0315d466 | 425 | // we could condition the stepping depending on the incident angle |
426 | // of the track | |
84541af4 | 427 | dex = x/numOfSteps; |
428 | dey = y/numOfSteps; | |
429 | dez = z/numOfSteps; | |
b0f5e3fc | 430 | |
84541af4 | 431 | return numOfSteps; |
fd61217e | 432 | } |
0315d466 | 433 | //---------------------------------------------------------------------- |
c7a4dac0 | 434 | void AliITSsimulationSSD::GetList(Int_t label,Int_t hit,Int_t mod, |
84541af4 | 435 | AliITSpList *pList,AliITSTableSSD *tav) { |
436 | // loop over nonzero digits | |
437 | Int_t ix,i; | |
438 | Double_t signal=0.; | |
439 | ||
440 | for(Int_t k=0; k<2; k++) { | |
441 | ix=tav->Use(k); | |
442 | while(ix>-1){ | |
443 | signal = fMapA2->GetSignal(k,ix); | |
444 | if(signal==0.0) { | |
445 | ix=tav->Use(k); | |
446 | continue; | |
447 | } | |
448 | // check the signal magnitude | |
449 | for(i=0;i<pList->GetNSignals(k,ix);i++){ | |
450 | signal -= pList->GetTSignal(k,ix,i); | |
451 | } | |
452 | // compare the new signal with already existing list | |
453 | if(signal>0)pList->AddSignal(k,ix,label,hit,mod,signal); | |
454 | ix=tav->Use(k); | |
455 | } // end of loop on strips | |
456 | } // end of loop on P/N side | |
457 | tav->Clear(); | |
fd61217e | 458 | } |
0315d466 | 459 | //---------------------------------------------------------------------- |
c7a4dac0 | 460 | void AliITSsimulationSSD::ChargeToSignal(AliITSpList *pList) { |
84541af4 | 461 | // charge to signal |
462 | static AliITS *aliITS = (AliITS*)gAlice->GetModule("ITS"); | |
463 | Float_t threshold = 0.; | |
464 | Int_t digits[3], tracks[3],hits[3],j1; | |
465 | Float_t charges[3] = {0.0,0.0,0.0}; | |
466 | Float_t signal; | |
467 | Float_t noise[2] = {0.,0.}; | |
0315d466 | 468 | |
84541af4 | 469 | ((AliITSresponseSSD*)fResponse)->GetNoiseParam(noise[0],noise[1]); |
0315d466 | 470 | |
84541af4 | 471 | for(Int_t k=0;k<2;k++){ // both sides (0=Pside, 1=Nside) |
0315d466 | 472 | // Threshold for zero-suppression |
473 | // It can be defined in AliITSresponseSSD | |
474 | // threshold = (Float_t)fResponse->MinVal(k); | |
475 | // I prefer to think adjusting the threshold "manually", looking | |
476 | // at the scope, and considering noise standard deviation | |
c7a4dac0 | 477 | threshold = 4.0*noise[k]; // 4 times noise is a choice |
478 | for(Int_t ix=0;ix<GetNStrips();ix++){ // loop over strips | |
84541af4 | 479 | if(fMapA2->GetSignal(k,ix) <= threshold)continue; |
480 | // convert to ADC signal | |
481 | signal = ((AliITSresponseSSD*)fResponse)->DEvToADC( | |
482 | fMapA2->GetSignal(k,ix)); | |
483 | if(signal>1024.) signal = 1024.;//if exceeding, accumulate last one | |
484 | digits[0] = k; | |
485 | digits[1] = ix; | |
486 | digits[2] = (Int_t) signal; | |
487 | for(j1=0;j1<3;j1++){ // only three in digit. | |
c7a4dac0 | 488 | tracks[j1] = pList->GetTrack(k,ix,j1); |
489 | hits[j1] = pList->GetHit(k,ix,j1); | |
84541af4 | 490 | } // end for j1 |
491 | // finally add digit | |
492 | aliITS->AddSimDigit(2,0,digits,tracks,hits,charges); | |
0315d466 | 493 | } // end for ix |
84541af4 | 494 | } // end for k |
c7a4dac0 | 495 | } |
496 | //______________________________________________________________________ | |
497 | void AliITSsimulationSSD::WriteSDigits(AliITSpList *pList){ | |
84541af4 | 498 | // Fills the Summable digits Tree |
499 | Int_t i,ni,j,nj; | |
500 | static AliITS *aliITS = (AliITS*)gAlice->GetModule("ITS"); | |
c7a4dac0 | 501 | |
84541af4 | 502 | pList->GetMaxMapIndex(ni,nj); |
503 | for(i=0;i<ni;i++)for(j=0;j<nj;j++){ | |
c7a4dac0 | 504 | if(pList->GetSignalOnly(i,j)>0.0){ |
84541af4 | 505 | aliITS->AddSumDigit(*(pList->GetpListItem(i,j))); |
506 | // cout << "pListSSD: " << *(pList->GetpListItem(i,j)) << endl; | |
c7a4dac0 | 507 | } // end if |
84541af4 | 508 | } // end for i,j |
509 | return; | |
c7a4dac0 | 510 | } |
511 | //______________________________________________________________________ | |
512 | void AliITSsimulationSSD::FillMapFrompList(AliITSpList *pList){ | |
84541af4 | 513 | // Fills fMap2A from the pList of Summable digits |
514 | Int_t k,ix; | |
c7a4dac0 | 515 | |
84541af4 | 516 | for(k=0;k<2;k++)for(ix=0;ix<GetNStrips();ix++) |
c7a4dac0 | 517 | fMapA2->AddSignal(k,ix,pList->GetSignal(k,ix)); |
84541af4 | 518 | return; |
b0f5e3fc | 519 | } |
57817f7c | 520 | //______________________________________________________________________ |
521 | void AliITSsimulationSSD::Print(ostream *os){ | |
84541af4 | 522 | //Standard output format for this class |
523 | ||
524 | //AliITSsimulation::Print(os); | |
525 | *os << fIonE <<","; | |
526 | *os << fDifConst[0] <<","<< fDifConst[1] <<","; | |
527 | *os << fDriftVel[0] <<","<< fDriftVel[1]; | |
528 | //*os <<","; fDCS->Print(os); | |
529 | //*os <<","; fMapA2->Print(os); | |
57817f7c | 530 | } |
531 | //______________________________________________________________________ | |
532 | void AliITSsimulationSSD::Read(istream *is){ | |
84541af4 | 533 | // Standard output streaming function. |
534 | ||
535 | //AliITSsimulation::Read(is); | |
536 | *is >> fIonE; | |
537 | *is >> fDifConst[0] >> fDifConst[1]; | |
538 | *is >> fDriftVel[0] >> fDriftVel[1]; | |
539 | //fDCS->Read(is); | |
540 | //fMapA2->Read(is); | |
57817f7c | 541 | } |
542 | //______________________________________________________________________ | |
543 | ostream &operator<<(ostream &os,AliITSsimulationSSD &source){ | |
84541af4 | 544 | // Standard output streaming function. |
57817f7c | 545 | |
84541af4 | 546 | source.Print(&os); |
547 | return os; | |
57817f7c | 548 | } |
549 | //______________________________________________________________________ | |
550 | istream &operator>>(istream &os,AliITSsimulationSSD &source){ | |
84541af4 | 551 | // Standard output streaming function. |
57817f7c | 552 | |
84541af4 | 553 | source.Read(&os); |
554 | return os; | |
57817f7c | 555 | } |
c7a4dac0 | 556 | //______________________________________________________________________ |
84541af4 | 557 | |
558 | ||
559 | ||
560 | ||
561 |