| 451f5018 |
1 | /* |
| 2 | questions to experts: why RemoveDeadPixels should be called before FrompListToDigits ? |
| 3 | |
| 4 | |
| 5 | */ |
| 6 | |
| 7 | /************************************************************************** |
| 8 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * |
| 9 | * * |
| 10 | * Author: The ALICE Off-line Project. * |
| 11 | * Contributors are mentioned in the code where appropriate. * |
| 12 | * * |
| 13 | * Permission to use, copy, modify and distribute this software and its * |
| 14 | * documentation strictly for non-commercial purposes is hereby granted * |
| 15 | * without fee, provided that the above copyright notice appears in all * |
| 16 | * copies and that both the copyright notice and this permission notice * |
| 17 | * appear in the supporting documentation. The authors make no claims * |
| 18 | * about the suitability of this software for any purpose. It is * |
| 19 | * provided "as is" without express or implied warranty. * |
| 20 | **************************************************************************/ |
| 21 | |
| 451f5018 |
22 | #include <TGeoGlobalMagField.h> |
| 23 | #include <TH1.h> |
| 24 | #include <TString.h> |
| 25 | #include "AliITSU.h" |
| 26 | #include "AliITSUDigitPix.h" |
| 27 | #include "AliITSUHit.h" |
| 28 | #include "AliITSUModule.h" |
| 29 | #include "AliITSUSensMap.h" |
| 30 | #include "AliITSUCalibrationPix.h" |
| 31 | #include "AliITSUSegmentationPix.h" |
| 32 | #include "AliITSUSimulationPix.h" |
| 33 | #include "AliLog.h" |
| 34 | #include "AliRun.h" |
| 35 | #include "AliMagF.h" |
| 36 | #include "AliMathBase.h" |
| 37 | #include "AliITSUSimuParam.h" |
| 38 | #include "AliITSUSDigit.h" |
| 39 | |
| 40 | ClassImp(AliITSUSimulationPix) |
| 41 | //////////////////////////////////////////////////////////////////////// |
| 42 | // Version: 1 |
| 43 | // Modified by D. Elia, G.E. Bruno, H. Tydesjo |
| 44 | // Fast diffusion code by Bjorn S. Nilsen |
| 45 | // March-April 2006 |
| 46 | // October 2007: GetCalibrationObjects() removed |
| 47 | // |
| 48 | // Version: 0 |
| 49 | // Written by Boris Batyunya |
| 50 | // December 20 1999 |
| 51 | // |
| 52 | // Adapted for pixels of ITS upgrade July 2012, ruben.shahoyan@cern.ch |
| 53 | // |
| 54 | // AliITSUSimulationPix is to do the simulation of pixels |
| 55 | // |
| 56 | //////////////////////////////////////////////////////////////////////// |
| 57 | |
| 58 | //______________________________________________________________________ |
| 59 | AliITSUSimulationPix::AliITSUSimulationPix() |
| 60 | : fTanLorAng(0) |
| 61 | ,fStrobe(kTRUE) |
| 62 | ,fStrobeLenght(4) |
| 63 | ,fStrobePhase(-12.5e-9) |
| 64 | { |
| 65 | // Default constructor. |
| 66 | } |
| 67 | |
| 68 | //______________________________________________________________________ |
| 69 | AliITSUSimulationPix::AliITSUSimulationPix(AliITSUSimuParam* sim,AliITSUSensMap* map) |
| 70 | :AliITSUSimulation(sim,map) |
| 71 | ,fTanLorAng(0) |
| 72 | ,fStrobe(kTRUE) |
| 73 | ,fStrobeLenght(4) |
| 74 | ,fStrobePhase(-12.5e-9) |
| 75 | { |
| 76 | // standard constructor |
| 77 | Init(); |
| 78 | } |
| 79 | |
| 80 | //______________________________________________________________________ |
| 81 | AliITSUSimulationPix::AliITSUSimulationPix(const AliITSUSimulationPix &s) |
| 82 | :AliITSUSimulation(s) |
| 83 | ,fTanLorAng(s.fTanLorAng) |
| 84 | ,fStrobe(s.fStrobe) |
| 85 | ,fStrobeLenght(s.fStrobeLenght) |
| 86 | ,fStrobePhase(s.fStrobePhase) |
| 87 | { |
| 88 | // Copy Constructor |
| 89 | } |
| 90 | |
| 91 | |
| 92 | //______________________________________________________________________ |
| 93 | AliITSUSimulationPix::~AliITSUSimulationPix() |
| 94 | { |
| 95 | // destructor |
| 96 | // only the sens map is owned and it is deleted by ~AliITSUSimulation |
| 97 | } |
| 98 | |
| 99 | //______________________________________________________________________ |
| 100 | AliITSUSimulationPix& AliITSUSimulationPix::operator=(const AliITSUSimulationPix &s) |
| 101 | { |
| 102 | // Assignment operator |
| 103 | if (&s == this) return *this; |
| 104 | AliITSUSimulation::operator=(s); |
| 105 | fStrobe = s.fStrobe; |
| 106 | fStrobeLenght = s.fStrobeLenght; |
| 107 | fStrobePhase = s.fStrobePhase; |
| 108 | return *this; |
| 109 | } |
| 110 | |
| 111 | //______________________________________________________________________ |
| 112 | void AliITSUSimulationPix::Init() |
| 113 | { |
| 114 | // Initilization |
| 4fa9d550 |
115 | if (fSimuParam->GetPixLorentzDrift()) SetTanLorAngle(fSimuParam->GetPixLorentzHoleWeight()); |
| 451f5018 |
116 | } |
| 117 | |
| 118 | //______________________________________________________________________ |
| 119 | Bool_t AliITSUSimulationPix::SetTanLorAngle(Double_t weightHole) |
| 120 | { |
| 121 | // This function set the Tangent of the Lorentz angle. |
| 122 | // A weighted average is used for electrons and holes |
| 123 | // Input: Double_t weightHole: wheight for hole: it should be in the range [0,1] |
| 124 | // output: Bool_t : kTRUE in case of success |
| 125 | // |
| 126 | if (weightHole<0) { |
| 127 | weightHole=0.; |
| 128 | AliWarning("You have asked for negative Hole weight"); |
| 129 | AliWarning("I'm going to use only electrons"); |
| 130 | } |
| 131 | if (weightHole>1) { |
| 132 | weightHole=1.; |
| 133 | AliWarning("You have asked for weight > 1"); |
| 134 | AliWarning("I'm going to use only holes"); |
| 135 | } |
| 136 | Double_t weightEle=1.-weightHole; |
| 137 | AliMagF* fld = (AliMagF*)TGeoGlobalMagField::Instance()->GetField(); |
| 138 | if (!fld) AliFatal("The field is not initialized"); |
| 139 | Double_t bz = fld->SolenoidField(); |
| 140 | fTanLorAng = TMath::Tan(weightHole*fSimuParam->LorentzAngleHole(bz) + |
| 141 | weightEle*fSimuParam->LorentzAngleElectron(bz)); |
| 142 | return kTRUE; |
| 143 | } |
| 144 | |
| 145 | //_____________________________________________________________________ |
| 146 | void AliITSUSimulationPix::SDigitiseModule(AliITSUModule *mod, Int_t /*mask*/,Int_t event, AliITSsegmentation* seg) |
| 147 | { |
| 148 | // This function begins the work of creating S-Digits. |
| 149 | if (!(mod->GetNHits())) { |
| 150 | AliDebug(1,Form("In event %d module %d there are %d hits returning.", |
| 151 | event, mod->GetIndex(),mod->GetNHits())); |
| 152 | return; |
| 153 | } |
| 154 | // |
| 155 | if (fStrobe) if (event != fEvent) GenerateStrobePhase(); |
| 156 | InitSimulationModule(mod->GetIndex(), event, seg ); |
| 157 | // Hits2SDigits(mod); |
| 158 | Hits2SDigitsFast(mod); |
| 4fa9d550 |
159 | if (fSimuParam->GetPixAddNoisyFlag()) AddNoisyPixels(); |
| 160 | if (fSimuParam->GetPixRemoveDeadFlag()) RemoveDeadPixels(); |
| 451f5018 |
161 | WriteSDigits(); |
| 162 | ClearMap(); |
| 163 | } |
| 164 | |
| 165 | //______________________________________________________________________ |
| 166 | void AliITSUSimulationPix::WriteSDigits() |
| 167 | { |
| 168 | // This function adds each S-Digit to pList |
| 169 | static AliITSU *aliITS = (AliITSU*)gAlice->GetModule("ITS"); |
| 170 | int nsd = fSensMap->GetEntries(); |
| 171 | for (int i=0;i<nsd;i++) { |
| 172 | AliITSUSDigit* sd = (AliITSUSDigit*)fSensMap->At(i); // ordered in index |
| 173 | if (!sd->GetSumSignal()>0 || fSensMap->IsDisabled(sd)) continue; |
| 174 | aliITS->AddSumDigit(*sd); |
| 175 | } |
| 176 | return; |
| 177 | } |
| 178 | |
| 179 | //______________________________________________________________________ |
| 180 | void AliITSUSimulationPix::FinishSDigitiseModule() |
| 181 | { |
| 182 | // This function calls SDigitsToDigits which creates Digits from SDigits |
| 183 | FrompListToDigits(); |
| 184 | ClearMap(); |
| 185 | return; |
| 186 | } |
| 187 | |
| 188 | //______________________________________________________________________ |
| 189 | void AliITSUSimulationPix::DigitiseModule(AliITSUModule *mod,Int_t /*mask*/, Int_t event, AliITSsegmentation* seg) |
| 190 | { |
| 191 | // This function creates Digits straight from the hits and then adds |
| 192 | // electronic noise to the digits before adding them to pList |
| 193 | // Each of the input variables is passed along to Hits2SDigits |
| 194 | // |
| 195 | if (fStrobe) if (event != fEvent) GenerateStrobePhase(); |
| 196 | InitSimulationModule( mod->GetIndex(), event, seg ); |
| 197 | // Hits2SDigits(mod); |
| 198 | Hits2SDigitsFast(mod); |
| 199 | // |
| 4fa9d550 |
200 | if (fSimuParam->GetPixAddNoisyFlag()) AddNoisyPixels(); |
| 201 | if (fSimuParam->GetPixRemoveDeadFlag()) RemoveDeadPixels(); |
| 451f5018 |
202 | FrompListToDigits(); |
| 203 | ClearMap(); |
| 204 | } |
| 205 | |
| 206 | //______________________________________________________________________ |
| 207 | void AliITSUSimulationPix::Hits2SDigits(AliITSUModule *mod) |
| 208 | { |
| 209 | // Does the charge distributions using Gaussian diffusion charge charing. |
| 210 | const Double_t kmictocm = 1.0e-4; // convert microns to cm. |
| 211 | const Double_t kcmtomic = 1.e4; |
| 212 | const Double_t kBunchLenght = 25e-9; // LHC clock |
| 213 | Int_t nhits = mod->GetNHits(); |
| 214 | if (!nhits) return; |
| 215 | // |
| 216 | Int_t h,ix,iz,i; |
| 217 | Int_t idtrack; |
| 4fa9d550 |
218 | Float_t x,y,z; // keep coordinates float (required by AliSegmentation) |
| 451f5018 |
219 | Double_t x0=0.0,x1=0.0,y0=0.0,y1=0.0,z0=0.0,z1=0.0,de=0.0,ld=0.0; |
| 4fa9d550 |
220 | Double_t t,tp,st,dt=0.2,el,sig,sigx,sigz,fda; |
| 451f5018 |
221 | Double_t thick = 0.5*kmictocm*fSeg->Dy(); // Half Thickness |
| 4fa9d550 |
222 | fSimuParam->GetPixSigmaDiffusionAsymmetry(fda); |
| 451f5018 |
223 | // |
| 224 | for (h=0;h<nhits;h++) { |
| 225 | if (fStrobe && |
| 226 | ((mod->GetHit(h)->GetTOF()<fStrobePhase) || |
| 227 | (mod->GetHit(h)->GetTOF()>(fStrobePhase+fStrobeLenght*kBunchLenght))) |
| 228 | ) continue; |
| 229 | // |
| 230 | if (!mod->LineSegmentL(h,x0,x1,y0,y1,z0,z1,de,idtrack)) continue; |
| 231 | st = TMath::Sqrt(x1*x1+y1*y1+z1*z1); |
| 232 | if (st>0.0) { |
| 233 | st = (Double_t)((Int_t)(st*kcmtomic)); // number of microns |
| 234 | if (st<=1.0) st = 1.0; |
| 235 | dt = 1.0/st; |
| 236 | for (t=0.0;t<1.0;t+=dt) { // Integrate over t |
| 237 | tp = t+0.5*dt; |
| 238 | x = x0+x1*tp; |
| 239 | y = y0+y1*tp; |
| 240 | z = z0+z1*tp; |
| 241 | if (!(fSeg->LocalToDet(x,z,ix,iz))) continue; // outside |
| 242 | el = dt * de / fSimuParam->GetGeVToCharge(); |
| 243 | // |
| 451f5018 |
244 | sig = fSimuParam->SigmaDiffusion1D(TMath::Abs(thick + y)); |
| 245 | sigx=sig; |
| 246 | sigz=sig*fda; |
| 4fa9d550 |
247 | if (fSimuParam->GetPixLorentzDrift()) ld=(y+thick)*fTanLorAng; |
| 451f5018 |
248 | SpreadChargeAsym(x,z,ix,iz,el,sigx,sigz,ld,idtrack,h); |
| 249 | } // end for t |
| 250 | } else { // st == 0.0 deposit it at this point |
| 251 | x = x0; |
| 252 | y = y0; |
| 253 | z = z0; |
| 254 | if (!(fSeg->LocalToDet(x,z,ix,iz))) continue; // outside |
| 255 | el = de / fSimuParam->GetGeVToCharge(); |
| 256 | sig = fSimuParam->SigmaDiffusion1D(TMath::Abs(thick + y)); |
| 257 | sigx = sig; |
| 258 | sigz = sig*fda; |
| 4fa9d550 |
259 | if (fSimuParam->GetPixLorentzDrift()) ld=(y+thick)*fTanLorAng; |
| 451f5018 |
260 | SpreadChargeAsym(x,z,ix,iz,el,sigx,sigz,ld,idtrack,h); |
| 261 | } // end if st>0.0 |
| 262 | } // Loop over all hits h |
| 263 | // |
| 264 | // Coupling |
| 265 | int nd = fSensMap->GetEntriesUnsorted(); // use unsorted access when possible, since it is faster |
| 266 | AliITSUSDigit* dg = 0; |
| 4fa9d550 |
267 | switch (fSimuParam->GetPixCouplingOption()) { |
| 268 | case AliITSUSimuParam::kNewCouplingPix : |
| 451f5018 |
269 | for (i=nd;i--;) { |
| 270 | dg = (AliITSUSDigit*)fSensMap->AtUnsorted(i); |
| 271 | if (fSensMap->IsDisabled(dg)) continue; |
| 272 | SetCoupling(dg,idtrack,h); |
| 273 | } |
| 274 | break; |
| 4fa9d550 |
275 | case AliITSUSimuParam::kOldCouplingPix: |
| 451f5018 |
276 | for (i=nd;i--;) { |
| 277 | dg = (AliITSUSDigit*)fSensMap->AtUnsorted(i); |
| 278 | if (fSensMap->IsDisabled(dg)) continue; |
| 279 | SetCouplingOld(dg,idtrack,h); |
| 280 | } |
| 281 | break; |
| 282 | default: |
| 283 | break; |
| 284 | |
| 285 | } // end switch |
| 4fa9d550 |
286 | if (GetDebug(2)) AliInfo(Form("Finished fCoupling=%d",fSimuParam->GetPixCouplingOption())); |
| 451f5018 |
287 | } |
| 288 | |
| 289 | //______________________________________________________________________ |
| 290 | void AliITSUSimulationPix::Hits2SDigitsFast(AliITSUModule *mod) |
| 291 | { |
| 292 | // Does the charge distributions using Gaussian diffusion charge charing. // Inputs: |
| 293 | // AliITSUModule *mod Pointer to this module |
| 294 | // Output: |
| 295 | // none. |
| 296 | // Return: |
| 297 | // none. |
| 298 | const Double_t kmictocm = 1.0e-4; // convert microns to cm. |
| 299 | const Int_t kn10=10; |
| 300 | const Double_t kti[kn10]={7.443716945e-3,2.166976971e-1,3.397047841e-1, |
| 301 | 4.325316833e-1,4.869532643e-1,5.130467358e-1, |
| 302 | 5.674683167e-1,6.602952159e-1,7.833023029e-1, |
| 303 | 9.255628306e-1}; |
| 304 | const Double_t kwi[kn10]={1.477621124e-1,1.346333597e-1,1.095431813e-1, |
| 305 | 7.472567455e-2,3.333567215e-2,3.333567215e-2, |
| 306 | 7.472567455e-2,1.095431813e-1,1.346333597e-1, |
| 307 | 1.477621124e-1}; |
| 308 | const Double_t kBunchLenght = 25e-9; // LHC clock |
| 309 | TObjArray *hits = mod->GetHits(); |
| 310 | Int_t nhits = hits->GetEntriesFast(); |
| 311 | if (nhits<=0) return; |
| 312 | // |
| 313 | Int_t h,ix,iz,i; |
| 314 | Int_t idtrack; |
| 4fa9d550 |
315 | Float_t x,y,z; // keep coordinates float (required by AliSegmentation) |
| 316 | Double_t x0=0.0,x1=0.0,y0=0.0,y1=0.0,z0=0.0,z1=0.0; |
| 317 | Double_t t,st,el,sig,sigx,sigz,fda,de=0.0,ld=0.0; |
| 451f5018 |
318 | Double_t thick = 0.5*kmictocm*fSeg->Dy(); // Half thickness |
| 4fa9d550 |
319 | fSimuParam->GetPixSigmaDiffusionAsymmetry(fda); |
| 451f5018 |
320 | // |
| 321 | for (h=0;h<nhits;h++) { |
| 322 | // Check if the hit is inside readout window |
| 323 | if (fStrobe && |
| 324 | ((mod->GetHit(h)->GetTOF()<fStrobePhase) || |
| 325 | (mod->GetHit(h)->GetTOF()>(fStrobePhase+fStrobeLenght*kBunchLenght))) |
| 326 | ) continue; |
| 327 | // |
| 328 | if (!mod->LineSegmentL(h,x0,x1,y0,y1,z0,z1,de,idtrack)) continue; |
| 329 | st = TMath::Sqrt(x1*x1+y1*y1+z1*z1); |
| 330 | if (st>0.0) |
| 331 | for (i=0;i<kn10;i++) { // Integrate over t |
| 332 | t = kti[i]; |
| 333 | x = x0+x1*t; |
| 334 | y = y0+y1*t; |
| 335 | z = z0+z1*t; |
| 336 | if (!(fSeg->LocalToDet(x,z,ix,iz))) continue; // outside |
| 337 | el = kwi[i]*de/fSimuParam->GetGeVToCharge(); |
| 338 | sig = fSimuParam->SigmaDiffusion1D(TMath::Abs(thick + y)); |
| 339 | sigx=sig; |
| 340 | sigz=sig*fda; |
| 4fa9d550 |
341 | if (fSimuParam->GetPixLorentzDrift()) ld=(y+thick)*fTanLorAng; |
| 451f5018 |
342 | SpreadChargeAsym(x,z,ix,iz,el,sigx,sigz,ld,idtrack,h); |
| 451f5018 |
343 | } // end for i // End Integrate over t |
| 344 | else { // st == 0.0 deposit it at this point |
| 345 | x = x0; |
| 346 | y = y0; |
| 347 | z = z0; |
| 348 | if (!(fSeg->LocalToDet(x,z,ix,iz))) continue; // outside |
| 349 | el = de / fSimuParam->GetGeVToCharge(); |
| 350 | sig = fSimuParam->SigmaDiffusion1D(TMath::Abs(thick + y)); |
| 351 | sigx=sig; |
| 352 | sigz=sig*fda; |
| 4fa9d550 |
353 | if (fSimuParam->GetPixLorentzDrift()) ld=(y+thick)*fTanLorAng; |
| 451f5018 |
354 | SpreadChargeAsym(x,z,ix,iz,el,sigx,sigz,ld,idtrack,h); |
| 355 | } // end if st>0.0 |
| 356 | |
| 357 | } // Loop over all hits h |
| 358 | |
| 359 | // Coupling |
| 360 | int nd = fSensMap->GetEntriesUnsorted(); // use unsorted access when possible, since it is faster |
| 361 | AliITSUSDigit* dg = 0; |
| 4fa9d550 |
362 | switch (fSimuParam->GetPixCouplingOption()) { |
| 363 | case AliITSUSimuParam::kNewCouplingPix : |
| 451f5018 |
364 | for (i=nd;i--;) { |
| 365 | dg = (AliITSUSDigit*)fSensMap->AtUnsorted(i); |
| 366 | if (fSensMap->IsDisabled(dg)) continue; |
| 367 | SetCoupling(dg,idtrack,h); |
| 368 | } |
| 4fa9d550 |
369 | case AliITSUSimuParam::kOldCouplingPix: |
| 451f5018 |
370 | for (i=nd;i--;) { |
| 371 | dg = (AliITSUSDigit*)fSensMap->AtUnsorted(i); |
| 372 | if (fSensMap->IsDisabled(dg)) continue; |
| 373 | SetCouplingOld(dg,idtrack,h); |
| 374 | } |
| 375 | break; |
| 376 | default: |
| 377 | break; |
| 378 | } // end switch |
| 4fa9d550 |
379 | if (GetDebug(2)) AliInfo(Form("Finished fCoupling=%d",fSimuParam->GetPixCouplingOption())); |
| 451f5018 |
380 | } |
| 381 | |
| 382 | //______________________________________________________________________ |
| 383 | void AliITSUSimulationPix::SpreadCharge(Double_t x0,Double_t z0, |
| 384 | Int_t ix0,Int_t iz0, |
| 385 | Double_t el,Double_t sig,Double_t ld, |
| 386 | Int_t t,Int_t hi) |
| 387 | { |
| 388 | // Spreads the charge over neighboring cells. Assume charge is distributed |
| 389 | // as charge(x,z) = (el/2*pi*sig*sig)*exp(-arg) |
| 390 | // arg=((x-x0)*(x-x0)/2*sig*sig)+((z-z0*z-z0)/2*sig*sig) |
| 4fa9d550 |
391 | // if fSimuParam->GetPixLorentzDrift()=kTRUE, then x0=x0+ld (Lorentz drift taken into account) |
| 451f5018 |
392 | // Defined this way, the integral over all x and z is el. |
| 393 | // Inputs: |
| 394 | // Double_t x0 x position of point where charge is liberated |
| 395 | // Double_t z0 z position of point where charge is liberated |
| 396 | // Int_t ix0 row of cell corresponding to point x0 |
| 397 | // Int_t iz0 columb of cell corresponding to point z0 |
| 398 | // Double_t el number of electrons liberated in this step |
| 399 | // Double_t sig Sigma difusion for this step (y0 dependent) |
| 400 | // Double_t ld lorentz drift in x for this step (y0 dependent) |
| 401 | // Int_t t track number |
| 402 | // Int_t ti hit track index number |
| 403 | // Int_t hi hit "hit" index number |
| 404 | // Outputs: |
| 405 | // none. |
| 406 | // Return: |
| 407 | // none. |
| 408 | const Int_t knx = 3,knz = 2; |
| 409 | const Double_t kRoot2 = 1.414213562; // Sqrt(2). |
| 410 | const Double_t kmictocm = 1.0e-4; // convert microns to cm. |
| 411 | Int_t ix,iz,ixs,ixe,izs,ize; |
| 4fa9d550 |
412 | Float_t x,z; // keep coordinates float (required by AliSegmentation) |
| 413 | Double_t s,sp,x1,x2,z1,z2; |
| 451f5018 |
414 | // |
| 4fa9d550 |
415 | if (GetDebug(2)) AliInfo(Form("(x0=%e,z0=%e,ix0=%d,iz0=%d,el=%e,sig=%e,t=%d,i=%d)",x0,z0,ix0,iz0,el,sig,t,hi)); |
| 451f5018 |
416 | if (sig<=0.0) { // if sig<=0 No diffusion to simulate. |
| 417 | UpdateMapSignal(iz0,ix0,t,hi,el); |
| 451f5018 |
418 | return; |
| 419 | } // end if |
| 420 | sp = 1.0/(sig*kRoot2); |
| 451f5018 |
421 | ixs = TMath::Max(-knx+ix0,0); |
| 422 | ixe = TMath::Min(knx+ix0,fSeg->Npx()-1); |
| 423 | izs = TMath::Max(-knz+iz0,0); |
| 424 | ize = TMath::Min(knz+iz0,fSeg->Npz()-1); |
| 425 | for (ix=ixs;ix<=ixe;ix++) |
| 426 | for (iz=izs;iz<=ize;iz++) { |
| 427 | fSeg->DetToLocal(ix,iz,x,z); // pixel center |
| 4fa9d550 |
428 | double dxi = 0.5*kmictocm*fSeg->Dpx(ix); |
| 429 | double dzi = 0.5*kmictocm*fSeg->Dpz(iz); |
| 451f5018 |
430 | x1 = x; |
| 431 | z1 = z; |
| 4fa9d550 |
432 | x2 = x1 + dxi; // Upper |
| 433 | x1 -= dxi; // Lower |
| 434 | z2 = z1 + dzi; // Upper |
| 435 | z1 -= dzi; // Lower |
| 451f5018 |
436 | x1 -= x0+ld; // Distance from where track traveled (taking into account the Lorentz drift) |
| 437 | x2 -= x0+ld; // Distance from where track traveled (taking into account the Lorentz drift) |
| 438 | z1 -= z0; // Distance from where track traveled |
| 439 | z2 -= z0; // Distance from where track traveled |
| 4fa9d550 |
440 | s = el*0.25; // Correction based on definision of Erfc |
| 451f5018 |
441 | s *= AliMathBase::ErfcFast(sp*x1) - AliMathBase::ErfcFast(sp*x2); |
| 451f5018 |
442 | s *= AliMathBase::ErfcFast(sp*z1) - AliMathBase::ErfcFast(sp*z2); |
| 4fa9d550 |
443 | if (s>fSimuParam->GetPixMinElToAdd()) UpdateMapSignal(iz,ix,t,hi,s); |
| 451f5018 |
444 | } // end for ix, iz |
| 445 | // |
| 446 | } |
| 447 | |
| 448 | //______________________________________________________________________ |
| 449 | void AliITSUSimulationPix::SpreadChargeAsym(Double_t x0,Double_t z0, |
| 4fa9d550 |
450 | Int_t ix0,Int_t iz0, |
| 451 | Double_t el,Double_t sigx,Double_t sigz, |
| 452 | Double_t ld,Int_t t,Int_t hi) |
| 451f5018 |
453 | { |
| 454 | // Spreads the charge over neighboring cells. Assume charge is distributed |
| 455 | // as charge(x,z) = (el/2*pi*sigx*sigz)*exp(-arg) |
| 456 | // arg=((x-x0)*(x-x0)/2*sigx*sigx)+((z-z0*z-z0)/2*sigz*sigz) |
| 4fa9d550 |
457 | // if fSimuParam->GetPixLorentzDrift()=kTRUE, then x0=x0+ld (Lorentz drift taken into account) |
| 451f5018 |
458 | // Defined this way, the integral over all x and z is el. |
| 459 | // Inputs: |
| 460 | // Double_t x0 x position of point where charge is liberated |
| 461 | // Double_t z0 z position of point where charge is liberated |
| 462 | // Int_t ix0 row of cell corresponding to point x0 |
| 463 | // Int_t iz0 columb of cell corresponding to point z0 |
| 464 | // Double_t el number of electrons liberated in this step |
| 465 | // Double_t sigx Sigma difusion along x for this step (y0 dependent) |
| 4fa9d550 |
466 | // Double_t sigz Sigma difusion along z for this step (z0 dependent) |
| 451f5018 |
467 | // Double_t ld lorentz drift in x for this stip (y0 dependent) |
| 468 | // Int_t t track number |
| 469 | // Int_t ti hit track index number |
| 470 | // Int_t hi hit "hit" index number |
| 471 | // Outputs: |
| 472 | // none. |
| 473 | // Return: |
| 474 | // none. |
| 4fa9d550 |
475 | const Int_t knx = 3,knz = 3; // RS: TO TUNE |
| 451f5018 |
476 | const Double_t kRoot2 = 1.414213562; // Sqrt(2). |
| 477 | const Double_t kmictocm = 1.0e-4; // convert microns to cm. |
| 478 | Int_t ix,iz,ixs,ixe,izs,ize; |
| 4fa9d550 |
479 | Float_t x,z; // keep coordinates float (required by AliSegmentation) |
| 480 | Double_t s,spx,spz,x1,x2,z1,z2; |
| 451f5018 |
481 | // |
| cf457606 |
482 | if (GetDebug(2)) AliInfo(Form("(x0=%e,z0=%e,ix0=%d,iz0=%d,el=%e,sigx=%e, sigz=%e, t=%d,i=%d,ld=%e)", |
| 483 | x0,z0,ix0,iz0,el,sigx,sigz,t,hi,ld)); |
| 451f5018 |
484 | if (sigx<=0.0 || sigz<=0.0) { // if sig<=0 No diffusion to simulate. |
| 485 | UpdateMapSignal(iz0,ix0,t,hi,el); |
| 451f5018 |
486 | return; |
| 487 | } // end if |
| 488 | spx = 1.0/(sigx*kRoot2); |
| 489 | spz = 1.0/(sigz*kRoot2); |
| 451f5018 |
490 | ixs = TMath::Max(-knx+ix0,0); |
| 491 | ixe = TMath::Min(knx+ix0,fSeg->Npx()-1); |
| 492 | izs = TMath::Max(-knz+iz0,0); |
| 493 | ize = TMath::Min(knz+iz0,fSeg->Npz()-1); |
| 494 | for (ix=ixs;ix<=ixe;ix++) |
| 495 | for (iz=izs;iz<=ize;iz++) { |
| 496 | fSeg->DetToLocal(ix,iz,x,z); // pixel center |
| 4fa9d550 |
497 | double dxi = 0.5*kmictocm*fSeg->Dpx(ix); |
| 498 | double dzi = 0.5*kmictocm*fSeg->Dpz(iz); |
| 451f5018 |
499 | x1 = x; |
| 500 | z1 = z; |
| 4fa9d550 |
501 | x2 = x1 + dxi; // Upper |
| 502 | x1 -= dxi; // Lower |
| 503 | z2 = z1 + dzi; // Upper |
| 504 | z1 -= dzi; // Lower |
| 451f5018 |
505 | x1 -= x0+ld; // Distance from where track traveled (taking into account the Lorentz drift) |
| 506 | x2 -= x0+ld; // Distance from where track traveled (taking into account the Lorentz drift) |
| 507 | z1 -= z0; // Distance from where track traveled |
| 508 | z2 -= z0; // Distance from where track traveled |
| 4fa9d550 |
509 | s = el*0.25; // Correction based on definision of Erfc |
| 451f5018 |
510 | s *= AliMathBase::ErfcFast(spx*x1) - AliMathBase::ErfcFast(spx*x2); |
| 451f5018 |
511 | s *= AliMathBase::ErfcFast(spz*z1) - AliMathBase::ErfcFast(spz*z2); |
| 4fa9d550 |
512 | if (s>fSimuParam->GetPixMinElToAdd()) UpdateMapSignal(iz,ix,t,hi,s); |
| 451f5018 |
513 | } // end for ix, iz |
| 514 | // |
| 515 | } |
| 516 | |
| 517 | //______________________________________________________________________ |
| 518 | void AliITSUSimulationPix::RemoveDeadPixels() |
| 519 | { |
| 520 | // Removes dead pixels on each module (ladder) |
| 521 | // This should be called before going from sdigits to digits (FrompListToDigits) |
| 522 | |
| 523 | AliITSUCalibrationPix* calObj = (AliITSUCalibrationPix*) GetCalibDead(); |
| 524 | if (!calObj) return; |
| 525 | // |
| 526 | if (calObj->IsBad()) {ClearMap(); return;} // whole module is masked |
| 527 | // |
| 528 | // remove single bad pixels one by one |
| 529 | int nsingle = calObj->GetNrBadSingle(); |
| 530 | UInt_t col,row; |
| 531 | for (int i=nsingle;i--;) { |
| 532 | calObj->GetBadPixelSingle(i,row,col); |
| 533 | fSensMap->DeleteItem(col,row); |
| 534 | } |
| 535 | int nsd = fSensMap->GetEntriesUnsorted(); |
| 536 | for (int isd=nsd;isd--;) { |
| 537 | AliITSUSDigit* sd = (AliITSUSDigit*)fSensMap->AtUnsorted(isd); |
| 538 | if (fSensMap->IsDisabled(sd)) continue; |
| 539 | fSensMap->GetMapIndex(sd->GetUniqueID(),col,row); |
| 540 | int chip = fSeg->GetChipFromChannel(0,col); |
| 541 | // if (calObj->IsChipMarkedBad(chip)) fSensMap->Disable(sd); // this will simple mark the hit as bad |
| 542 | if (calObj->IsChipMarkedBad(chip)) fSensMap->DeleteItem(sd); // this will suppress hit in the sorted list |
| 543 | } |
| 544 | // |
| 545 | } |
| 546 | |
| 547 | //______________________________________________________________________ |
| 548 | void AliITSUSimulationPix::AddNoisyPixels() |
| 549 | { |
| 550 | // Adds noisy pixels on each module (ladder) |
| 551 | // This should be called before going from sdigits to digits (FrompListToDigits) |
| 552 | AliITSUCalibrationPix* calObj = (AliITSUCalibrationPix*) GetCalibNoisy(); |
| 553 | if (!calObj) return; |
| 554 | for (Int_t i=calObj->GetNrBad(); i--;) UpdateMapNoise(calObj->GetBadColAt(i), calObj->GetBadRowAt(i), |
| 4fa9d550 |
555 | 10*fSimuParam->GetPixThreshold(fModule)); |
| 451f5018 |
556 | // |
| 557 | } |
| 558 | |
| 559 | //______________________________________________________________________ |
| 560 | void AliITSUSimulationPix::FrompListToDigits() |
| 561 | { |
| 562 | // add noise and electronics, perform the zero suppression and add the |
| 563 | // digit to the list |
| 564 | static AliITSU *aliITS = (AliITSU*)gAlice->GetModule("ITS"); |
| 565 | UInt_t ix,iz; |
| 566 | Double_t sig; |
| 567 | const Int_t knmaxtrk=AliITSdigit::GetNTracks(); |
| 568 | static AliITSUDigitPix dig; |
| 569 | // RS: in principle: |
| 570 | // 1) for every pixel w/o hit we have to generate a noise and activate the pixel if the noise exceeds the threshold. |
| 571 | // 2) for every pixel with hit we should add random noise and check if the total signal exceeds the threshold |
| 572 | // With many channels this will be too time consuming, hence I do the following |
| 573 | // 1) Precalculate the probability that the nois alone will exceed the threshold. |
| 574 | // 2) Chose randomly empty pixels according to this probability and apply the noise above threshold. |
| 575 | // 3) For pixels having a hits apply the usual noise and compare with threshold |
| 576 | // |
| 577 | // RS may use for ordered random sample generation dl.acm.org/ft_gateway.cfm?id=356313&type=pdf |
| 578 | // |
| 579 | int maxInd = fSensMap->GetMaxIndex(); |
| 580 | double minProb = 0.1/maxInd; |
| 581 | // |
| 582 | int nsd = fSensMap->GetEntries(); |
| 583 | Int_t prevID=0,curID=0; |
| 584 | TArrayI ordSampleInd(100),ordSample(100); |
| 585 | // |
| 4fa9d550 |
586 | double probNoisy,noiseSig,noiseMean,thresh = fSimuParam->GetPixThreshold(fModule); |
| 587 | fSimuParam->GetPixNoise(fModule, noiseSig, noiseMean); |
| 451f5018 |
588 | probNoisy = AliITSUSimuParam::CalcProbNoiseOverThreshold(noiseMean,noiseSig,thresh); // prob. to have noise above threshold |
| 589 | // |
| 590 | for (int i=0;i<nsd;i++) { |
| 591 | AliITSUSDigit* sd = (AliITSUSDigit*)fSensMap->At(i); // ordered in index |
| 592 | if (fSensMap->IsDisabled(sd)) continue; |
| 593 | curID = (int)sd->GetUniqueID(); |
| 594 | // |
| 595 | if (probNoisy>minProb) { // generate randomly noisy pixels above the threshold, with ID's between previous hit and current |
| 596 | CreateNoisyDigits(prevID,curID,probNoisy, noiseSig, noiseMean); |
| 597 | prevID = curID+1; |
| 598 | } |
| 599 | // |
| 4fa9d550 |
600 | if ((sig=sd->GetSumSignal())<=fSimuParam->GetPixThreshold(fModule)) continue; |
| 451f5018 |
601 | if (TMath::Abs(sig)>2147483647.0) { //RS? |
| 602 | //PH 2147483647 is the max. integer |
| 603 | //PH This apparently is a problem which needs investigation |
| 604 | AliWarning(Form("Too big or too small signal value %f",sig)); |
| 605 | } |
| 606 | fSensMap->GetMapIndex(sd->GetUniqueID(),iz,ix); |
| 607 | dig.SetCoord1(iz); |
| 608 | dig.SetCoord2(ix); |
| 609 | dig.SetSignal(1); |
| 610 | dig.SetSignalPix((Int_t)sig); |
| 611 | int ntr = sd->GetNTracks(); |
| 612 | for (int j=0;j<ntr;j++) { |
| 613 | dig.SetTrack(j,sd->GetTrack(j)); |
| 614 | dig.SetHit(j,sd->GetHit(j)); |
| 615 | } |
| 616 | for (int j=ntr;j<knmaxtrk;j++) { |
| 617 | dig.SetTrack(j,-3); |
| 618 | dig.SetHit(j,-1); |
| 619 | } |
| 02d6eccc |
620 | aliITS->AddSimDigit(AliITSUGeomTGeo::kDetTypePix, &dig); |
| 451f5018 |
621 | } |
| 622 | // if needed, add noisy pixels with id from last real hit to maxID |
| 623 | if (probNoisy>minProb) CreateNoisyDigits(prevID,maxInd,probNoisy, noiseSig, noiseMean); |
| 624 | // |
| 625 | } |
| 626 | |
| 627 | //______________________________________________________________________ |
| 628 | Int_t AliITSUSimulationPix::CreateNoisyDigits(Int_t minID,Int_t maxID,double probNoisy, double noise, double base) |
| 629 | { |
| 630 | // create random noisy digits above threshold within id range [minID,maxID[ |
| 631 | // see FrompListToDigits for details |
| 632 | // |
| 633 | static AliITSU *aliITS = (AliITSU*)gAlice->GetModule("ITS"); |
| 634 | UInt_t ix,iz; |
| 635 | static AliITSUDigitPix dig; |
| 636 | static TArrayI ordSampleInd(100),ordSample(100); //RS!!! static is not thread-safe!!! |
| 637 | const Int_t knmaxtrk=AliITSdigit::GetNTracks(); |
| 638 | // |
| 639 | Int_t ncand = 0; |
| 640 | int npix = maxID-minID; |
| 641 | if (npix<1 || (ncand=gRandom->Poisson(npix*probNoisy))<1) return ncand; // decide how many noisy pixels will be added |
| 642 | ncand = GenOrderedSample(npix,ncand,ordSample,ordSampleInd); |
| 643 | int* ordV = ordSample.GetArray(); |
| 644 | int* ordI = ordSampleInd.GetArray(); |
| 645 | for (int j=0;j<ncand;j++) { |
| 646 | fSensMap->GetMapIndex((UInt_t)ordV[ordI[j]],iz,ix); // create noisy digit |
| 647 | dig.SetCoord1(iz); |
| 648 | dig.SetCoord2(ix); |
| 649 | dig.SetSignal(1); |
| 650 | dig.SetSignalPix((Int_t)AliITSUSimuParam::GenerateNoiseQFunction(probNoisy,base,noise)); |
| 651 | for (int k=knmaxtrk;k--;) { |
| 652 | dig.SetTrack(k,-3); |
| 653 | dig.SetHit(k,-1); |
| 654 | } |
| 02d6eccc |
655 | aliITS->AddSimDigit(AliITSUGeomTGeo::kDetTypePix,&dig); |
| 4fa9d550 |
656 | if (GetDebug(2)) AliInfo(Form("Add noisy pixel %d(%d/%d) Noise=%d",ordV[ordI[j]],iz,ix,dig.GetSignalPix())); |
| 451f5018 |
657 | } |
| 658 | return ncand; |
| 659 | } |
| 660 | |
| 661 | //______________________________________________________________________ |
| 662 | void AliITSUSimulationPix::SetCoupling(AliITSUSDigit* old, Int_t ntrack, Int_t idhit) |
| 663 | { |
| 664 | // Take into account the coupling between adiacent pixels. |
| 665 | // The parameters probcol and probrow are the probability of the |
| 666 | // signal in one pixel shared in the two adjacent pixels along |
| 667 | // the column and row direction, respectively. |
| 668 | // Note pList is goten via GetMap() and module is not need any more. |
| 669 | // Otherwise it is identical to that coded by Tiziano Virgili (BSN). |
| 670 | //Begin_Html |
| 671 | /* |
| 672 | <img src="picts/ITS/barimodel_3.gif"> |
| 673 | </pre> |
| 674 | <br clear=left> |
| 675 | <font size=+2 color=red> |
| 676 | <a href="mailto:tiziano.virgili@cern.ch"></a>. |
| 677 | </font> |
| 678 | <pre> |
| 679 | */ |
| 680 | //End_Html |
| 681 | // Inputs: |
| 682 | // old existing AliITSUSDigit |
| 683 | // Int_t ntrack track incex number |
| 684 | // Int_t idhit hit index number |
| 685 | UInt_t col,row; |
| 686 | Double_t pulse1,pulse2; |
| 687 | Double_t couplR=0.0,couplC=0.0; |
| 688 | Double_t xr=0.; |
| 689 | // |
| 690 | fSensMap->GetMapIndex(old->GetUniqueID(),col,row); |
| 4fa9d550 |
691 | fSimuParam->GetPixCouplingParam(couplC,couplR); |
| 692 | if (GetDebug(2)) AliInfo(Form("(col=%d,row=%d,ntrack=%d,idhit=%d) couplC=%e couplR=%e", |
| 693 | col,row,ntrack,idhit,couplC,couplR)); |
| 451f5018 |
694 | pulse2 = pulse1 = old->GetSignal(); |
| 4fa9d550 |
695 | if (pulse1<fSimuParam->GetPixMinElToAdd()) return; // too small signal |
| 451f5018 |
696 | for (Int_t isign=-1;isign<=1;isign+=2) { |
| 697 | // |
| 698 | // loop in col direction |
| 699 | int j1 = int(col) + isign; |
| 700 | xr = gRandom->Rndm(); |
| 701 | if ( !((j1<0) || (j1>fSeg->Npz()-1) || (xr>couplC)) ) UpdateMapSignal(UInt_t(j1),row,ntrack,idhit,pulse1); |
| 702 | // |
| 703 | // loop in row direction |
| 704 | int j2 = int(row) + isign; |
| 705 | xr = gRandom->Rndm(); |
| 706 | if ( !((j2<0) || (j2>fSeg->Npx()-1) || (xr>couplR)) ) UpdateMapSignal(col,UInt_t(j2),ntrack,idhit,pulse2); |
| 707 | } |
| 708 | // |
| 709 | } |
| 710 | |
| 711 | //______________________________________________________________________ |
| 712 | void AliITSUSimulationPix::SetCouplingOld(AliITSUSDigit* old, Int_t ntrack,Int_t idhit) |
| 713 | { |
| 714 | // Take into account the coupling between adiacent pixels. |
| 715 | // The parameters probcol and probrow are the fractions of the |
| 716 | // signal in one pixel shared in the two adjacent pixels along |
| 717 | // the column and row direction, respectively. |
| 718 | //Begin_Html |
| 719 | /* |
| 720 | <img src="picts/ITS/barimodel_3.gif"> |
| 721 | </pre> |
| 722 | <br clear=left> |
| 723 | <font size=+2 color=red> |
| 724 | <a href="mailto:Rocco.Caliandro@ba.infn.it"></a>. |
| 725 | </font> |
| 726 | <pre> |
| 727 | */ |
| 728 | //End_Html |
| 729 | // Inputs: |
| 730 | // old existing AliITSUSDigit |
| 731 | // ntrack track incex number |
| 732 | // idhit hit index number |
| 733 | // module module number |
| 734 | // |
| 735 | UInt_t col,row; |
| 736 | Double_t pulse1,pulse2; |
| 737 | Double_t couplR=0.0,couplC=0.0; |
| 738 | // |
| 739 | fSensMap->GetMapIndex(old->GetUniqueID(),col,row); |
| 4fa9d550 |
740 | fSimuParam->GetPixCouplingParam(couplC,couplR); |
| 741 | if (GetDebug(3)) AliInfo(Form("(col=%d,row=%d,ntrack=%d,idhit=%d) couplC=%e couplR=%e", |
| 742 | col,row,ntrack,idhit,couplC,couplR)); |
| 743 | // |
| 744 | if (old->GetSignal()<fSimuParam->GetPixMinElToAdd()) return; // too small signal |
| 745 | for (Int_t isign=-1;isign<=1;isign+=2) {// loop in col direction |
| 746 | pulse2 = pulse1 = old->GetSignal(); |
| 747 | // |
| 748 | int j1 = int(col)+isign; |
| 749 | pulse1 *= couplC; |
| 750 | if ((j1<0)||(j1>fSeg->Npz()-1)||(pulse1<fSimuParam->GetPixThreshold(fModule))) pulse1 = old->GetSignal(); |
| 751 | else UpdateMapSignal(UInt_t(j1),row,ntrack,idhit,pulse1); |
| 752 | |
| 753 | // loop in row direction |
| 754 | int j2 = int(row) + isign; |
| 755 | pulse2 *= couplR; |
| 756 | if ((j2<0)||(j2>(fSeg->Npx()-1))||(pulse2<fSimuParam->GetPixThreshold(fModule))) pulse2 = old->GetSignal(); |
| 757 | else UpdateMapSignal(col,UInt_t(j2),ntrack,idhit,pulse2); |
| 758 | } // for isign |
| 451f5018 |
759 | } |
| 760 | |
| 761 | //______________________________________________________________________ |
| 762 | void AliITSUSimulationPix::GenerateStrobePhase() |
| 763 | { |
| 764 | // Generate randomly the strobe |
| 765 | // phase w.r.t to the LHC clock |
| 766 | // Done once per event |
| 767 | const Double_t kBunchLenght = 25e-9; // LHC clock |
| 768 | fStrobePhase = ((Double_t)gRandom->Integer(fStrobeLenght))*kBunchLenght- |
| 769 | (Double_t)fStrobeLenght*kBunchLenght+ |
| 770 | kBunchLenght/2; |
| 771 | } |
| 772 | |
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