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4c039060 | 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 | ||
88cb7938 | 16 | /* $Id$ */ |
4c039060 | 17 | |
030b4415 | 18 | //////////////////////////////////////////////////////////////////////////// |
19 | // // | |
20 | // Transition Radiation Detector version 1 -- slow simulator // | |
21 | // // | |
22 | //////////////////////////////////////////////////////////////////////////// | |
fe4da5cc | 23 | |
769257f4 | 24 | #include <stdlib.h> |
25 | ||
793ff80c | 26 | #include <TF1.h> |
1819f4bb | 27 | #include <TLorentzVector.h> |
88cb7938 | 28 | #include <TMath.h> |
29 | #include <TRandom.h> | |
30 | #include <TVector.h> | |
31 | #include <TVirtualMC.h> | |
f57bb418 | 32 | #include <TGeoManager.h> |
fe4da5cc | 33 | |
d3f347ff | 34 | #include "AliConst.h" |
45160b1f | 35 | #include "AliLog.h" |
36 | #include "AliMC.h" | |
88cb7938 | 37 | #include "AliRun.h" |
030b4415 | 38 | |
88cb7938 | 39 | #include "AliTRDgeometry.h" |
793ff80c | 40 | #include "AliTRDhit.h" |
793ff80c | 41 | #include "AliTRDsim.h" |
88cb7938 | 42 | #include "AliTRDv1.h" |
851d3db9 | 43 | |
fe4da5cc | 44 | ClassImp(AliTRDv1) |
8230f242 | 45 | |
46 | //_____________________________________________________________________________ | |
030b4415 | 47 | AliTRDv1::AliTRDv1() |
48 | :AliTRD() | |
49 | ,fTRon(kFALSE) | |
50 | ,fTR(NULL) | |
51 | ,fTypeOfStepManager(0) | |
52 | ,fStepSize(0) | |
53 | ,fDeltaE(NULL) | |
54 | ,fDeltaG(NULL) | |
55 | ,fTrackLength0(0) | |
56 | ,fPrimaryTrackPid(0) | |
8230f242 | 57 | { |
58 | // | |
59 | // Default constructor | |
60 | // | |
61 | ||
8230f242 | 62 | } |
63 | ||
fe4da5cc | 64 | //_____________________________________________________________________________ |
65 | AliTRDv1::AliTRDv1(const char *name, const char *title) | |
030b4415 | 66 | :AliTRD(name,title) |
67 | ,fTRon(kTRUE) | |
68 | ,fTR(NULL) | |
67c47633 | 69 | ,fTypeOfStepManager(2) |
030b4415 | 70 | ,fStepSize(0.1) |
71 | ,fDeltaE(NULL) | |
72 | ,fDeltaG(NULL) | |
73 | ,fTrackLength0(0) | |
74 | ,fPrimaryTrackPid(0) | |
fe4da5cc | 75 | { |
76 | // | |
851d3db9 | 77 | // Standard constructor for Transition Radiation Detector version 1 |
fe4da5cc | 78 | // |
82bbf98a | 79 | |
5c7f4665 | 80 | SetBufferSize(128000); |
81 | ||
82 | } | |
83 | ||
84 | //_____________________________________________________________________________ | |
85 | AliTRDv1::~AliTRDv1() | |
86 | { | |
dd9a6ee3 | 87 | // |
88 | // AliTRDv1 destructor | |
89 | // | |
82bbf98a | 90 | |
030b4415 | 91 | if (fDeltaE) { |
92 | delete fDeltaE; | |
93 | fDeltaE = 0; | |
94 | } | |
95 | ||
96 | if (fDeltaG) { | |
97 | delete fDeltaG; | |
98 | fDeltaG = 0; | |
99 | } | |
100 | ||
101 | if (fTR) { | |
102 | delete fTR; | |
103 | fTR = 0; | |
104 | } | |
82bbf98a | 105 | |
fe4da5cc | 106 | } |
107 | ||
f57bb418 | 108 | //_____________________________________________________________________________ |
109 | void AliTRDv1::AddAlignableVolumes() const | |
110 | { | |
111 | // | |
112 | // Create entries for alignable volumes associating the symbolic volume | |
113 | // name with the corresponding volume path. Needs to be syncronized with | |
114 | // eventual changes in the geometry. | |
115 | // | |
116 | ||
117 | TString volPath; | |
118 | TString symName; | |
119 | ||
120 | TString vpStr = "ALIC_1/B077_1/BSEGMO"; | |
121 | TString vpApp1 = "_1/BTRD"; | |
122 | TString vpApp2 = "_1"; | |
123 | TString vpApp3 = "/UTR1_1/UTS1_1/UTI1_1/UT"; | |
124 | ||
125 | TString snStr = "TRD/sm"; | |
126 | TString snApp1 = "/st"; | |
127 | TString snApp2 = "/pl"; | |
128 | ||
129 | // | |
130 | // The super modules | |
131 | // The symbolic names are: TRD/sm00 | |
132 | // ... | |
133 | // TRD/sm17 | |
134 | // | |
135 | for (Int_t isect = 0; isect < AliTRDgeometry::Nsect(); isect++) { | |
136 | ||
137 | volPath = vpStr; | |
138 | volPath += isect; | |
139 | volPath += vpApp1; | |
140 | volPath += isect; | |
141 | volPath += vpApp2; | |
142 | ||
143 | symName = snStr; | |
144 | symName += Form("%02d",isect); | |
145 | ||
146 | gGeoManager->SetAlignableEntry(symName.Data(),volPath.Data()); | |
147 | ||
148 | } | |
149 | ||
150 | // | |
151 | // The readout chambers | |
152 | // The symbolic names are: TRD/sm00/st0/pl0 | |
153 | // ... | |
154 | // TRD/sm17/st4/pl5 | |
155 | // | |
156 | for (Int_t isect = 0; isect < AliTRDgeometry::Nsect(); isect++) { | |
157 | for (Int_t icham = 0; icham < AliTRDgeometry::Ncham(); icham++) { | |
158 | for (Int_t iplan = 0; iplan < AliTRDgeometry::Nplan(); iplan++) { | |
159 | ||
160 | Int_t idet = AliTRDgeometry::GetDetectorSec(iplan,icham); | |
161 | ||
162 | volPath = vpStr; | |
163 | volPath += isect; | |
164 | volPath += vpApp1; | |
165 | volPath += isect; | |
166 | volPath += vpApp2; | |
167 | volPath += vpApp3; | |
168 | volPath += Form("%02d",idet); | |
169 | volPath += vpApp2; | |
170 | ||
171 | symName = snStr; | |
172 | symName += Form("%02d",isect); | |
173 | symName += snApp1; | |
174 | symName += icham; | |
175 | symName += snApp2; | |
176 | symName += iplan; | |
177 | ||
f57bb418 | 178 | gGeoManager->SetAlignableEntry(symName.Data(),volPath.Data()); |
179 | ||
180 | } | |
181 | } | |
182 | } | |
183 | ||
184 | } | |
185 | ||
fe4da5cc | 186 | //_____________________________________________________________________________ |
187 | void AliTRDv1::CreateGeometry() | |
188 | { | |
189 | // | |
851d3db9 | 190 | // Create the GEANT geometry for the Transition Radiation Detector - Version 1 |
5c7f4665 | 191 | // This version covers the full azimuth. |
d3f347ff | 192 | // |
193 | ||
82bbf98a | 194 | // Check that FRAME is there otherwise we have no place where to put the TRD |
8230f242 | 195 | AliModule* frame = gAlice->GetModule("FRAME"); |
030b4415 | 196 | if (!frame) { |
197 | AliError("TRD needs FRAME to be present\n"); | |
198 | return; | |
199 | } | |
d3f347ff | 200 | |
82bbf98a | 201 | // Define the chambers |
202 | AliTRD::CreateGeometry(); | |
d3f347ff | 203 | |
fe4da5cc | 204 | } |
205 | ||
206 | //_____________________________________________________________________________ | |
207 | void AliTRDv1::CreateMaterials() | |
208 | { | |
209 | // | |
851d3db9 | 210 | // Create materials for the Transition Radiation Detector version 1 |
fe4da5cc | 211 | // |
82bbf98a | 212 | |
d3f347ff | 213 | AliTRD::CreateMaterials(); |
82bbf98a | 214 | |
fe4da5cc | 215 | } |
216 | ||
793ff80c | 217 | //_____________________________________________________________________________ |
218 | void AliTRDv1::CreateTRhit(Int_t det) | |
219 | { | |
220 | // | |
221 | // Creates an electron cluster from a TR photon. | |
222 | // The photon is assumed to be created a the end of the radiator. The | |
223 | // distance after which it deposits its energy takes into account the | |
224 | // absorbtion of the entrance window and of the gas mixture in drift | |
225 | // volume. | |
226 | // | |
227 | ||
793ff80c | 228 | // Ionization energy |
bc327ce2 | 229 | const Float_t kWion = 23.53; |
793ff80c | 230 | |
231 | // Maximum number of TR photons per track | |
232 | const Int_t kNTR = 50; | |
233 | ||
030b4415 | 234 | TLorentzVector mom; |
235 | TLorentzVector pos; | |
793ff80c | 236 | |
ce0d6231 | 237 | Float_t eTR[kNTR]; |
238 | Int_t nTR; | |
793ff80c | 239 | |
ce0d6231 | 240 | // Create TR photons |
241 | gMC->TrackMomentum(mom); | |
242 | Float_t pTot = mom.Rho(); | |
243 | fTR->CreatePhotons(11,pTot,nTR,eTR); | |
244 | if (nTR > kNTR) { | |
245 | AliFatal(Form("Boundary error: nTR = %d, kNTR = %d",nTR,kNTR)); | |
246 | } | |
f73816f5 | 247 | |
ce0d6231 | 248 | // Loop through the TR photons |
249 | for (Int_t iTR = 0; iTR < nTR; iTR++) { | |
793ff80c | 250 | |
ce0d6231 | 251 | Float_t energyMeV = eTR[iTR] * 0.001; |
252 | Float_t energyeV = eTR[iTR] * 1000.0; | |
253 | Float_t absLength = 0.0; | |
254 | Float_t sigma = 0.0; | |
793ff80c | 255 | |
ce0d6231 | 256 | // Take the absorbtion in the entrance window into account |
257 | Double_t muMy = fTR->GetMuMy(energyMeV); | |
258 | sigma = muMy * fFoilDensity; | |
259 | if (sigma > 0.0) { | |
260 | absLength = gRandom->Exp(1.0/sigma); | |
261 | if (absLength < AliTRDgeometry::MyThick()) { | |
842287f2 | 262 | continue; |
263 | } | |
ce0d6231 | 264 | } |
265 | else { | |
266 | continue; | |
267 | } | |
793ff80c | 268 | |
ce0d6231 | 269 | // The absorbtion cross sections in the drift gas |
270 | // Gas-mixture (Xe/CO2) | |
271 | Double_t muXe = fTR->GetMuXe(energyMeV); | |
272 | Double_t muCO = fTR->GetMuCO(energyMeV); | |
273 | sigma = (0.85 * muXe + 0.15 * muCO) * fGasDensity * fTR->GetTemp(); | |
274 | ||
275 | // The distance after which the energy of the TR photon | |
276 | // is deposited. | |
277 | if (sigma > 0.0) { | |
278 | absLength = gRandom->Exp(1.0/sigma); | |
279 | if (absLength > (AliTRDgeometry::DrThick() | |
280 | + AliTRDgeometry::AmThick())) { | |
842287f2 | 281 | continue; |
282 | } | |
ce0d6231 | 283 | } |
284 | else { | |
285 | continue; | |
286 | } | |
793ff80c | 287 | |
ce0d6231 | 288 | // The position of the absorbtion |
289 | Float_t posHit[3]; | |
290 | gMC->TrackPosition(pos); | |
291 | posHit[0] = pos[0] + mom[0] / pTot * absLength; | |
292 | posHit[1] = pos[1] + mom[1] / pTot * absLength; | |
293 | posHit[2] = pos[2] + mom[2] / pTot * absLength; | |
793ff80c | 294 | |
ce0d6231 | 295 | // Create the charge |
296 | Int_t q = ((Int_t) (energyeV / kWion)); | |
793ff80c | 297 | |
ce0d6231 | 298 | // Add the hit to the array. TR photon hits are marked |
299 | // by negative charge | |
2fa01832 | 300 | // The hit time is needed for pile-up events |
ce0d6231 | 301 | AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber() |
302 | ,det | |
303 | ,posHit | |
304 | ,-q | |
2fa01832 | 305 | ,gMC->TrackTime()*1.0e06 |
d4c6453d | 306 | ,kTRUE); |
793ff80c | 307 | |
308 | } | |
309 | ||
310 | } | |
311 | ||
5c7f4665 | 312 | //_____________________________________________________________________________ |
313 | void AliTRDv1::Init() | |
314 | { | |
315 | // | |
316 | // Initialise Transition Radiation Detector after geometry has been built. | |
5c7f4665 | 317 | // |
318 | ||
319 | AliTRD::Init(); | |
320 | ||
45160b1f | 321 | AliDebug(1,"Slow simulator\n"); |
bd0f8685 | 322 | |
323 | // Switch on TR simulation as default | |
324 | if (!fTRon) { | |
45160b1f | 325 | AliInfo("TR simulation off"); |
bd0f8685 | 326 | } |
327 | else { | |
328 | fTR = new AliTRDsim(); | |
329 | } | |
5c7f4665 | 330 | |
331 | // First ionization potential (eV) for the gas mixture (90% Xe + 10% CO2) | |
332 | const Float_t kPoti = 12.1; | |
333 | // Maximum energy (50 keV); | |
334 | const Float_t kEend = 50000.0; | |
335 | // Ermilova distribution for the delta-ray spectrum | |
030b4415 | 336 | Float_t poti = TMath::Log(kPoti); |
337 | Float_t eEnd = TMath::Log(kEend); | |
a328fff9 | 338 | |
339 | // Ermilova distribution for the delta-ray spectrum | |
c4214bc0 | 340 | fDeltaE = new TF1("deltae" ,Ermilova ,poti,eEnd,0); |
a328fff9 | 341 | |
342 | // Geant3 distribution for the delta-ray spectrum | |
c4214bc0 | 343 | fDeltaG = new TF1("deltag",IntSpecGeant,2.421257,28.536469,0); |
5c7f4665 | 344 | |
45160b1f | 345 | AliDebug(1,"+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"); |
5c7f4665 | 346 | |
fe4da5cc | 347 | } |
348 | ||
5c7f4665 | 349 | //_____________________________________________________________________________ |
350 | void AliTRDv1::StepManager() | |
a328fff9 | 351 | { |
352 | // | |
c4214bc0 | 353 | // Slow simulator. Every charged track produces electron cluster as hits |
a328fff9 | 354 | // along its path across the drift volume. |
355 | // | |
356 | ||
357 | switch (fTypeOfStepManager) { | |
a6dd11e9 | 358 | case 0: |
359 | StepManagerErmilova(); | |
360 | break; | |
361 | case 1: | |
362 | StepManagerGeant(); | |
363 | break; | |
364 | case 2: | |
365 | StepManagerFixedStep(); | |
366 | break; | |
367 | default: | |
368 | AliWarning("Not a valid Step Manager."); | |
a328fff9 | 369 | } |
370 | ||
371 | } | |
372 | ||
373 | //_____________________________________________________________________________ | |
374 | void AliTRDv1::SelectStepManager(Int_t t) | |
375 | { | |
376 | // | |
377 | // Selects a step manager type: | |
378 | // 0 - Ermilova | |
379 | // 1 - Geant3 | |
380 | // 2 - Fixed step size | |
381 | // | |
382 | ||
a328fff9 | 383 | fTypeOfStepManager = t; |
45160b1f | 384 | AliInfo(Form("Step Manager type %d was selected",fTypeOfStepManager)); |
a328fff9 | 385 | |
386 | } | |
387 | ||
388 | //_____________________________________________________________________________ | |
389 | void AliTRDv1::StepManagerGeant() | |
390 | { | |
391 | // | |
c4214bc0 | 392 | // Slow simulator. Every charged track produces electron cluster as hits |
a328fff9 | 393 | // along its path across the drift volume. The step size is set acording |
394 | // to Bethe-Bloch. The energy distribution of the delta electrons follows | |
395 | // a spectrum taken from Geant3. | |
396 | // | |
f2e3a0b5 | 397 | // Version by A. Bercuci |
398 | // | |
399 | ||
c4214bc0 | 400 | Int_t pla = 0; |
401 | Int_t cha = 0; | |
402 | Int_t sec = 0; | |
403 | Int_t det = 0; | |
404 | Int_t iPdg; | |
405 | Int_t qTot; | |
406 | ||
407 | Float_t hits[3]; | |
408 | Float_t charge; | |
409 | Float_t aMass; | |
410 | ||
030b4415 | 411 | Double_t pTot = 0; |
c4214bc0 | 412 | Double_t eDelta; |
030b4415 | 413 | Double_t betaGamma; |
414 | Double_t pp; | |
f2e3a0b5 | 415 | Double_t stepSize = 0; |
c4214bc0 | 416 | |
417 | Bool_t drRegion = kFALSE; | |
418 | Bool_t amRegion = kFALSE; | |
419 | ||
2c8bf4aa | 420 | TString cIdPath; |
421 | Char_t cIdSector[3]; | |
422 | cIdSector[2] = 0; | |
423 | ||
c4214bc0 | 424 | TString cIdCurrent; |
425 | TString cIdSensDr = "J"; | |
426 | TString cIdSensAm = "K"; | |
427 | Char_t cIdChamber[3]; | |
428 | cIdChamber[2] = 0; | |
429 | ||
030b4415 | 430 | TLorentzVector pos; |
431 | TLorentzVector mom; | |
c4214bc0 | 432 | |
030b4415 | 433 | TArrayI processes; |
f2e3a0b5 | 434 | |
c4214bc0 | 435 | const Int_t kNplan = AliTRDgeometry::Nplan(); |
436 | const Int_t kNcham = AliTRDgeometry::Ncham(); | |
437 | const Int_t kNdetsec = kNplan * kNcham; | |
438 | ||
030b4415 | 439 | const Double_t kBig = 1.0e+12; // Infinitely big |
bc327ce2 | 440 | const Float_t kWion = 23.53; // Ionization energy |
c4214bc0 | 441 | const Float_t kPTotMaxEl = 0.002; // Maximum momentum for e+ e- g |
442 | ||
443 | // Minimum energy for the step size adjustment | |
444 | const Float_t kEkinMinStep = 1.0e-5; | |
445 | // energy threshold for production of delta electrons | |
f2e3a0b5 | 446 | const Float_t kECut = 1.0e4; |
447 | // Parameters entering the parametrized range for delta electrons | |
030b4415 | 448 | const Float_t kRa = 5.37e-4; |
f2e3a0b5 | 449 | const Float_t kRb = 0.9815; |
030b4415 | 450 | const Float_t kRc = 3.123e-3; |
f2e3a0b5 | 451 | // Gas density -> To be made user adjustable ! |
030b4415 | 452 | // [0.85*0.00549+0.15*0.00186 (Xe-CO2 85-15)] |
453 | const Float_t kRho = 0.004945 ; | |
a328fff9 | 454 | |
c4214bc0 | 455 | // Plateau value of the energy-loss for electron in xenon |
030b4415 | 456 | // The averaged value (26/3/99) |
c4214bc0 | 457 | const Float_t kPlateau = 1.55; |
030b4415 | 458 | // dN1/dx|min for the gas mixture (90% Xe + 10% CO2) |
459 | const Float_t kPrim = 19.34; | |
c4214bc0 | 460 | // First ionization potential (eV) for the gas mixture (90% Xe + 10% CO2) |
461 | const Float_t kPoti = 12.1; | |
030b4415 | 462 | // PDG code electron |
463 | const Int_t kPdgElectron = 11; | |
c4214bc0 | 464 | |
465 | // Set the maximum step size to a very large number for all | |
466 | // neutral particles and those outside the driftvolume | |
467 | gMC->SetMaxStep(kBig); | |
468 | ||
469 | // Use only charged tracks | |
470 | if (( gMC->TrackCharge() ) && | |
c4214bc0 | 471 | (!gMC->IsTrackDisappeared())) { |
472 | ||
473 | // Inside a sensitive volume? | |
474 | drRegion = kFALSE; | |
475 | amRegion = kFALSE; | |
476 | cIdCurrent = gMC->CurrentVolName(); | |
477 | if (cIdSensDr == cIdCurrent[1]) { | |
478 | drRegion = kTRUE; | |
479 | } | |
480 | if (cIdSensAm == cIdCurrent[1]) { | |
481 | amRegion = kTRUE; | |
482 | } | |
483 | if (drRegion || amRegion) { | |
a328fff9 | 484 | |
c4214bc0 | 485 | // The hit coordinates and charge |
486 | gMC->TrackPosition(pos); | |
487 | hits[0] = pos[0]; | |
488 | hits[1] = pos[1]; | |
489 | hits[2] = pos[2]; | |
490 | ||
2c8bf4aa | 491 | // The sector number (0 - 17), according to standard coordinate system |
492 | cIdPath = gGeoManager->GetPath(); | |
493 | cIdSector[0] = cIdPath[21]; | |
494 | cIdSector[1] = cIdPath[22]; | |
495 | sec = atoi(cIdSector); | |
c4214bc0 | 496 | |
497 | // The plane and chamber number | |
030b4415 | 498 | cIdChamber[0] = cIdCurrent[2]; |
499 | cIdChamber[1] = cIdCurrent[3]; | |
c4214bc0 | 500 | Int_t idChamber = (atoi(cIdChamber) % kNdetsec); |
afb9f880 | 501 | cha = ((Int_t) idChamber / kNplan); |
c4214bc0 | 502 | pla = ((Int_t) idChamber % kNplan); |
503 | ||
ce0d6231 | 504 | // The detector number |
505 | det = fGeometry->GetDetector(pla,cha,sec); | |
c4214bc0 | 506 | |
ce0d6231 | 507 | // Special hits only in the drift region |
508 | if ((drRegion) && | |
509 | (gMC->IsTrackEntering())) { | |
c4214bc0 | 510 | |
ce0d6231 | 511 | // Create a track reference at the entrance of each |
512 | // chamber that contains the momentum components of the particle | |
513 | gMC->TrackMomentum(mom); | |
514 | AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber()); | |
c4214bc0 | 515 | |
ce0d6231 | 516 | // Create the hits from TR photons if electron/positron is |
517 | // entering the drift volume | |
518 | if ((fTR) && | |
519 | (TMath::Abs(gMC->TrackPid()) == kPdgElectron)) { | |
520 | CreateTRhit(det); | |
521 | } | |
f2e3a0b5 | 522 | |
ce0d6231 | 523 | } |
524 | else if ((amRegion) && | |
525 | (gMC->IsTrackExiting())) { | |
f2e3a0b5 | 526 | |
ce0d6231 | 527 | // Create a track reference at the exit of each |
528 | // chamber that contains the momentum components of the particle | |
529 | gMC->TrackMomentum(mom); | |
530 | AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber()); | |
c4214bc0 | 531 | |
ce0d6231 | 532 | } |
c4214bc0 | 533 | |
ce0d6231 | 534 | // Calculate the energy of the delta-electrons |
535 | // modified by Alex Bercuci (A.Bercuci@gsi.de) on 26.01.06 | |
536 | // take into account correlation with the underlying GEANT tracking | |
537 | // mechanism. see | |
538 | // http://www-linux.gsi.de/~abercuci/Contributions/TRD/index.html | |
539 | // | |
540 | // determine the most significant process (last on the processes list) | |
541 | // which caused this hit | |
542 | gMC->StepProcesses(processes); | |
543 | Int_t nofprocesses = processes.GetSize(); | |
544 | Int_t pid; | |
545 | if (!nofprocesses) { | |
546 | pid = 0; | |
547 | } | |
548 | else { | |
549 | pid = processes[nofprocesses-1]; | |
550 | } | |
f2e3a0b5 | 551 | |
ce0d6231 | 552 | // Generate Edep according to GEANT parametrisation |
553 | eDelta = TMath::Exp(fDeltaG->GetRandom()) - kPoti; | |
554 | eDelta = TMath::Max(eDelta,0.0); | |
555 | Float_t prRange = 0.0; | |
556 | Float_t range = gMC->TrackLength() - fTrackLength0; | |
557 | // merge GEANT tracker information with locally cooked one | |
558 | if (gAlice->GetMCApp()->GetCurrentTrackNumber() == fPrimaryTrackPid) { | |
559 | if (pid == 27) { | |
560 | if (eDelta >= kECut) { | |
561 | prRange = kRa * eDelta * 0.001 | |
562 | * (1.0 - kRb / (1.0 + kRc * eDelta * 0.001)) / kRho; | |
563 | if (prRange >= (3.7 - range)) { | |
564 | eDelta *= 0.1; | |
565 | } | |
566 | } | |
567 | } | |
568 | else if (pid == 1) { | |
569 | if (eDelta < kECut) { | |
570 | eDelta *= 0.5; | |
571 | } | |
572 | else { | |
573 | prRange = kRa * eDelta * 0.001 | |
574 | * (1.0 - kRb / (1.0 + kRc * eDelta * 0.001)) / kRho; | |
575 | if (prRange >= ((AliTRDgeometry::DrThick() | |
576 | + AliTRDgeometry::AmThick()) - range)) { | |
577 | eDelta *= 0.05; | |
578 | } | |
579 | else { | |
f2e3a0b5 | 580 | eDelta *= 0.5; |
ce0d6231 | 581 | } |
582 | } | |
583 | } | |
f2e3a0b5 | 584 | else { |
585 | eDelta = 0.0; | |
ce0d6231 | 586 | } |
587 | } | |
588 | else { | |
589 | eDelta = 0.0; | |
590 | } | |
c4214bc0 | 591 | |
ce0d6231 | 592 | // Generate the electron cluster size |
593 | if (eDelta > 0.0) { | |
f2e3a0b5 | 594 | |
ce0d6231 | 595 | qTot = ((Int_t) (eDelta / kWion) + 1); |
596 | ||
597 | // Create a new dEdx hit | |
2fa01832 | 598 | // The hit time is needed for pile-up events |
030b4415 | 599 | AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber() |
600 | ,det | |
601 | ,hits | |
602 | ,qTot | |
2fa01832 | 603 | ,gMC->TrackTime()*1.0e06 |
030b4415 | 604 | ,drRegion); |
c4214bc0 | 605 | |
ce0d6231 | 606 | } |
607 | ||
608 | // Calculate the maximum step size for the next tracking step | |
609 | // Produce only one hit if Ekin is below cutoff | |
610 | aMass = gMC->TrackMass(); | |
611 | if ((gMC->Etot() - aMass) > kEkinMinStep) { | |
612 | ||
613 | // The energy loss according to Bethe Bloch | |
614 | iPdg = TMath::Abs(gMC->TrackPid()); | |
615 | if ((iPdg != kPdgElectron) || | |
616 | ((iPdg == kPdgElectron) && | |
617 | (pTot < kPTotMaxEl))) { | |
618 | gMC->TrackMomentum(mom); | |
619 | pTot = mom.Rho(); | |
620 | betaGamma = pTot / aMass; | |
621 | pp = BetheBlochGeant(betaGamma); | |
622 | // Take charge > 1 into account | |
623 | charge = gMC->TrackCharge(); | |
624 | if (TMath::Abs(charge) > 1) { | |
625 | pp = pp * charge*charge; | |
626 | } | |
627 | } | |
628 | else { | |
629 | // Electrons above 20 Mev/c are at the plateau | |
630 | pp = kPrim * kPlateau; | |
631 | } | |
f2e3a0b5 | 632 | |
ce0d6231 | 633 | Int_t nsteps = 0; |
634 | do { | |
635 | nsteps = gRandom->Poisson(pp); | |
636 | } while(!nsteps); | |
637 | stepSize = 1.0 / nsteps; | |
638 | gMC->SetMaxStep(stepSize); | |
f2e3a0b5 | 639 | |
c4214bc0 | 640 | } |
f2e3a0b5 | 641 | |
c4214bc0 | 642 | } |
f2e3a0b5 | 643 | |
c4214bc0 | 644 | } |
f2e3a0b5 | 645 | |
a328fff9 | 646 | } |
647 | ||
648 | //_____________________________________________________________________________ | |
649 | void AliTRDv1::StepManagerErmilova() | |
5c7f4665 | 650 | { |
651 | // | |
5c7f4665 | 652 | // Slow simulator. Every charged track produces electron cluster as hits |
653 | // along its path across the drift volume. The step size is set acording | |
654 | // to Bethe-Bloch. The energy distribution of the delta electrons follows | |
655 | // a spectrum taken from Ermilova et al. | |
656 | // | |
657 | ||
851d3db9 | 658 | Int_t pla = 0; |
659 | Int_t cha = 0; | |
660 | Int_t sec = 0; | |
793ff80c | 661 | Int_t det = 0; |
851d3db9 | 662 | Int_t iPdg; |
793ff80c | 663 | Int_t qTot; |
5c7f4665 | 664 | |
793ff80c | 665 | Float_t hits[3]; |
a5cadd36 | 666 | Double_t random[1]; |
5c7f4665 | 667 | Float_t charge; |
668 | Float_t aMass; | |
669 | ||
030b4415 | 670 | Double_t pTot = 0.0; |
5c7f4665 | 671 | Double_t eDelta; |
030b4415 | 672 | Double_t betaGamma; |
673 | Double_t pp; | |
f73816f5 | 674 | Double_t stepSize; |
5c7f4665 | 675 | |
332e9569 | 676 | Bool_t drRegion = kFALSE; |
677 | Bool_t amRegion = kFALSE; | |
678 | ||
2c8bf4aa | 679 | TString cIdPath; |
680 | Char_t cIdSector[3]; | |
681 | cIdSector[2] = 0; | |
682 | ||
332e9569 | 683 | TString cIdCurrent; |
684 | TString cIdSensDr = "J"; | |
685 | TString cIdSensAm = "K"; | |
593a9fc3 | 686 | Char_t cIdChamber[3]; |
687 | cIdChamber[2] = 0; | |
332e9569 | 688 | |
030b4415 | 689 | TLorentzVector pos; |
690 | TLorentzVector mom; | |
82bbf98a | 691 | |
332e9569 | 692 | const Int_t kNplan = AliTRDgeometry::Nplan(); |
e644678a | 693 | const Int_t kNcham = AliTRDgeometry::Ncham(); |
694 | const Int_t kNdetsec = kNplan * kNcham; | |
695 | ||
030b4415 | 696 | const Double_t kBig = 1.0e+12; // Infinitely big |
bc327ce2 | 697 | const Float_t kWion = 23.53; // Ionization energy |
a328fff9 | 698 | const Float_t kPTotMaxEl = 0.002; // Maximum momentum for e+ e- g |
5c7f4665 | 699 | |
f73816f5 | 700 | // Minimum energy for the step size adjustment |
701 | const Float_t kEkinMinStep = 1.0e-5; | |
a328fff9 | 702 | |
5c7f4665 | 703 | // Plateau value of the energy-loss for electron in xenon |
030b4415 | 704 | // The averaged value (26/3/99) |
a3c76cdc | 705 | const Float_t kPlateau = 1.55; |
030b4415 | 706 | // dN1/dx|min for the gas mixture (90% Xe + 10% CO2) |
707 | const Float_t kPrim = 48.0; | |
5c7f4665 | 708 | // First ionization potential (eV) for the gas mixture (90% Xe + 10% CO2) |
a3c76cdc | 709 | const Float_t kPoti = 12.1; |
030b4415 | 710 | // PDG code electron |
711 | const Int_t kPdgElectron = 11; | |
5c7f4665 | 712 | |
713 | // Set the maximum step size to a very large number for all | |
714 | // neutral particles and those outside the driftvolume | |
715 | gMC->SetMaxStep(kBig); | |
716 | ||
717 | // Use only charged tracks | |
718 | if (( gMC->TrackCharge() ) && | |
5c7f4665 | 719 | (!gMC->IsTrackDisappeared())) { |
fe4da5cc | 720 | |
5c7f4665 | 721 | // Inside a sensitive volume? |
332e9569 | 722 | drRegion = kFALSE; |
723 | amRegion = kFALSE; | |
724 | cIdCurrent = gMC->CurrentVolName(); | |
e6674585 | 725 | if (cIdSensDr == cIdCurrent[1]) { |
332e9569 | 726 | drRegion = kTRUE; |
727 | } | |
e6674585 | 728 | if (cIdSensAm == cIdCurrent[1]) { |
332e9569 | 729 | amRegion = kTRUE; |
730 | } | |
731 | if (drRegion || amRegion) { | |
fe4da5cc | 732 | |
5c7f4665 | 733 | // The hit coordinates and charge |
734 | gMC->TrackPosition(pos); | |
735 | hits[0] = pos[0]; | |
736 | hits[1] = pos[1]; | |
737 | hits[2] = pos[2]; | |
5c7f4665 | 738 | |
2c8bf4aa | 739 | // The sector number (0 - 17), according to standard coordinate system |
740 | cIdPath = gGeoManager->GetPath(); | |
741 | cIdSector[0] = cIdPath[21]; | |
742 | cIdSector[1] = cIdPath[22]; | |
743 | sec = atoi(cIdSector); | |
82bbf98a | 744 | |
332e9569 | 745 | // The plane and chamber number |
746 | cIdChamber[0] = cIdCurrent[2]; | |
747 | cIdChamber[1] = cIdCurrent[3]; | |
e644678a | 748 | Int_t idChamber = (atoi(cIdChamber) % kNdetsec); |
afb9f880 | 749 | cha = ((Int_t) idChamber / kNplan); |
332e9569 | 750 | pla = ((Int_t) idChamber % kNplan); |
82bbf98a | 751 | |
ce0d6231 | 752 | // The detector number |
753 | det = fGeometry->GetDetector(pla,cha,sec); | |
5c7f4665 | 754 | |
ce0d6231 | 755 | // Special hits only in the drift region |
756 | if ((drRegion) && | |
757 | (gMC->IsTrackEntering())) { | |
5c7f4665 | 758 | |
ce0d6231 | 759 | // Create a track reference at the entrance of each |
760 | // chamber that contains the momentum components of the particle | |
761 | gMC->TrackMomentum(mom); | |
762 | AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber()); | |
793ff80c | 763 | |
ce0d6231 | 764 | // Create the hits from TR photons if electron/positron is |
765 | // entering the drift volume | |
766 | if ((fTR) && | |
767 | (TMath::Abs(gMC->TrackPid()) == kPdgElectron)) { | |
768 | CreateTRhit(det); | |
769 | } | |
f73816f5 | 770 | |
ce0d6231 | 771 | } |
772 | else if ((amRegion) && | |
773 | (gMC->IsTrackExiting())) { | |
f73816f5 | 774 | |
ce0d6231 | 775 | // Create a track reference at the exit of each |
776 | // chamber that contains the momentum components of the particle | |
777 | gMC->TrackMomentum(mom); | |
778 | AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber()); | |
f73816f5 | 779 | |
ce0d6231 | 780 | } |
781 | ||
782 | // Calculate the energy of the delta-electrons | |
783 | eDelta = TMath::Exp(fDeltaE->GetRandom()) - kPoti; | |
784 | eDelta = TMath::Max(eDelta,0.0); | |
785 | ||
786 | // Generate the electron cluster size | |
787 | if (eDelta > 0.0) { | |
788 | ||
789 | qTot = ((Int_t) (eDelta / kWion) + 1); | |
f73816f5 | 790 | |
030b4415 | 791 | // Create a new dEdx hit |
2fa01832 | 792 | // The hit time is needed for pile-up events |
332e9569 | 793 | if (drRegion) { |
a328fff9 | 794 | AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber() |
030b4415 | 795 | ,det |
796 | ,hits | |
797 | ,qTot | |
2fa01832 | 798 | ,gMC->TrackTime()*1.0e06 |
030b4415 | 799 | ,kTRUE); |
800 | } | |
5c7f4665 | 801 | else { |
a328fff9 | 802 | AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber() |
030b4415 | 803 | ,det |
804 | ,hits | |
805 | ,qTot | |
2fa01832 | 806 | ,gMC->TrackTime()*1.0e06 |
030b4415 | 807 | ,kFALSE); |
808 | } | |
f73816f5 | 809 | |
ce0d6231 | 810 | } |
811 | ||
812 | // Calculate the maximum step size for the next tracking step | |
813 | // Produce only one hit if Ekin is below cutoff | |
814 | aMass = gMC->TrackMass(); | |
815 | if ((gMC->Etot() - aMass) > kEkinMinStep) { | |
816 | ||
817 | // The energy loss according to Bethe Bloch | |
818 | iPdg = TMath::Abs(gMC->TrackPid()); | |
819 | if ((iPdg != kPdgElectron) || | |
820 | ((iPdg == kPdgElectron) && | |
821 | (pTot < kPTotMaxEl))) { | |
822 | gMC->TrackMomentum(mom); | |
823 | pTot = mom.Rho(); | |
824 | betaGamma = pTot / aMass; | |
825 | pp = kPrim * BetheBloch(betaGamma); | |
826 | // Take charge > 1 into account | |
827 | charge = gMC->TrackCharge(); | |
828 | if (TMath::Abs(charge) > 1) { | |
829 | pp = pp * charge*charge; | |
f73816f5 | 830 | } |
ce0d6231 | 831 | } |
832 | else { | |
833 | // Electrons above 20 Mev/c are at the plateau | |
834 | pp = kPrim * kPlateau; | |
835 | } | |
f73816f5 | 836 | |
ce0d6231 | 837 | if (pp > 0.0) { |
838 | do { | |
839 | gMC->GetRandom()->RndmArray(1,random); | |
030b4415 | 840 | } |
ce0d6231 | 841 | while ((random[0] == 1.0) || |
842 | (random[0] == 0.0)); | |
843 | stepSize = - TMath::Log(random[0]) / pp; | |
844 | gMC->SetMaxStep(stepSize); | |
845 | } | |
030b4415 | 846 | |
5c7f4665 | 847 | } |
030b4415 | 848 | |
d3f347ff | 849 | } |
030b4415 | 850 | |
5c7f4665 | 851 | } |
030b4415 | 852 | |
5c7f4665 | 853 | } |
854 | ||
a328fff9 | 855 | //_____________________________________________________________________________ |
856 | void AliTRDv1::StepManagerFixedStep() | |
857 | { | |
858 | // | |
859 | // Slow simulator. Every charged track produces electron cluster as hits | |
860 | // along its path across the drift volume. The step size is fixed in | |
861 | // this version of the step manager. | |
862 | // | |
863 | ||
ce0d6231 | 864 | // PDG code electron |
865 | const Int_t kPdgElectron = 11; | |
866 | ||
a328fff9 | 867 | Int_t pla = 0; |
868 | Int_t cha = 0; | |
869 | Int_t sec = 0; | |
870 | Int_t det = 0; | |
871 | Int_t qTot; | |
872 | ||
873 | Float_t hits[3]; | |
874 | Double_t eDep; | |
875 | ||
876 | Bool_t drRegion = kFALSE; | |
877 | Bool_t amRegion = kFALSE; | |
878 | ||
2c8bf4aa | 879 | TString cIdPath; |
880 | Char_t cIdSector[3]; | |
881 | cIdSector[2] = 0; | |
882 | ||
a328fff9 | 883 | TString cIdCurrent; |
884 | TString cIdSensDr = "J"; | |
885 | TString cIdSensAm = "K"; | |
886 | Char_t cIdChamber[3]; | |
2c8bf4aa | 887 | cIdChamber[2] = 0; |
a328fff9 | 888 | |
030b4415 | 889 | TLorentzVector pos; |
890 | TLorentzVector mom; | |
a328fff9 | 891 | |
892 | const Int_t kNplan = AliTRDgeometry::Nplan(); | |
893 | const Int_t kNcham = AliTRDgeometry::Ncham(); | |
894 | const Int_t kNdetsec = kNplan * kNcham; | |
895 | ||
030b4415 | 896 | const Double_t kBig = 1.0e+12; |
a328fff9 | 897 | |
bc327ce2 | 898 | const Float_t kWion = 23.53; // Ionization energy |
a328fff9 | 899 | const Float_t kEkinMinStep = 1.0e-5; // Minimum energy for the step size adjustment |
900 | ||
901 | // Set the maximum step size to a very large number for all | |
902 | // neutral particles and those outside the driftvolume | |
903 | gMC->SetMaxStep(kBig); | |
904 | ||
905 | // If not charged track or already stopped or disappeared, just return. | |
906 | if ((!gMC->TrackCharge()) || | |
ce0d6231 | 907 | gMC->IsTrackDisappeared()) { |
908 | return; | |
909 | } | |
a328fff9 | 910 | |
911 | // Inside a sensitive volume? | |
912 | cIdCurrent = gMC->CurrentVolName(); | |
913 | ||
ce0d6231 | 914 | if (cIdSensDr == cIdCurrent[1]) { |
915 | drRegion = kTRUE; | |
916 | } | |
917 | if (cIdSensAm == cIdCurrent[1]) { | |
918 | amRegion = kTRUE; | |
919 | } | |
a328fff9 | 920 | |
030b4415 | 921 | if ((!drRegion) && |
922 | (!amRegion)) { | |
923 | return; | |
924 | } | |
a328fff9 | 925 | |
926 | // The hit coordinates and charge | |
927 | gMC->TrackPosition(pos); | |
928 | hits[0] = pos[0]; | |
929 | hits[1] = pos[1]; | |
930 | hits[2] = pos[2]; | |
931 | ||
2c8bf4aa | 932 | // The sector number (0 - 17), according to standard coordinate system |
933 | cIdPath = gGeoManager->GetPath(); | |
934 | cIdSector[0] = cIdPath[21]; | |
935 | cIdSector[1] = cIdPath[22]; | |
936 | sec = atoi(cIdSector); | |
a328fff9 | 937 | |
938 | // The plane and chamber number | |
030b4415 | 939 | cIdChamber[0] = cIdCurrent[2]; |
940 | cIdChamber[1] = cIdCurrent[3]; | |
a328fff9 | 941 | Int_t idChamber = (atoi(cIdChamber) % kNdetsec); |
afb9f880 | 942 | cha = ((Int_t) idChamber / kNplan); |
a328fff9 | 943 | pla = ((Int_t) idChamber % kNplan); |
e0d47c25 | 944 | |
030b4415 | 945 | // The detector number |
946 | det = fGeometry->GetDetector(pla,cha,sec); | |
947 | ||
2fa01832 | 948 | // 0:InFlight 1:Entering 2:Exiting |
030b4415 | 949 | Int_t trkStat = 0; |
a328fff9 | 950 | |
951 | // Special hits only in the drift region | |
ce0d6231 | 952 | if ((drRegion) && |
953 | (gMC->IsTrackEntering())) { | |
a328fff9 | 954 | |
ce0d6231 | 955 | // Create a track reference at the entrance of each |
956 | // chamber that contains the momentum components of the particle | |
957 | gMC->TrackMomentum(mom); | |
958 | AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber()); | |
959 | trkStat = 1; | |
a328fff9 | 960 | |
ce0d6231 | 961 | // Create the hits from TR photons if electron/positron is |
962 | // entering the drift volume | |
963 | if ((fTR) && | |
964 | (TMath::Abs(gMC->TrackPid()) == kPdgElectron)) { | |
030b4415 | 965 | CreateTRhit(det); |
966 | } | |
a328fff9 | 967 | |
ce0d6231 | 968 | } |
969 | else if ((amRegion) && | |
970 | (gMC->IsTrackExiting())) { | |
971 | ||
972 | // Create a track reference at the exit of each | |
973 | // chamber that contains the momentum components of the particle | |
974 | gMC->TrackMomentum(mom); | |
975 | AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber()); | |
976 | trkStat = 2; | |
977 | ||
a328fff9 | 978 | } |
979 | ||
980 | // Calculate the charge according to GEANT Edep | |
981 | // Create a new dEdx hit | |
2fa01832 | 982 | // The hit time is needed for pile-up events |
a328fff9 | 983 | eDep = TMath::Max(gMC->Edep(),0.0) * 1.0e+09; |
984 | qTot = (Int_t) (eDep / kWion); | |
ce0d6231 | 985 | if ((qTot) || |
986 | (trkStat)) { | |
987 | AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber() | |
988 | ,det | |
989 | ,hits | |
990 | ,qTot | |
2fa01832 | 991 | ,gMC->TrackTime()*1.0e06 |
ce0d6231 | 992 | ,drRegion); |
993 | } | |
a328fff9 | 994 | |
995 | // Set Maximum Step Size | |
996 | // Produce only one hit if Ekin is below cutoff | |
030b4415 | 997 | if ((gMC->Etot() - gMC->TrackMass()) < kEkinMinStep) { |
998 | return; | |
999 | } | |
a328fff9 | 1000 | gMC->SetMaxStep(fStepSize); |
1001 | ||
1002 | } | |
1003 | ||
5c7f4665 | 1004 | //_____________________________________________________________________________ |
1005 | Double_t AliTRDv1::BetheBloch(Double_t bg) | |
1006 | { | |
1007 | // | |
1008 | // Parametrization of the Bethe-Bloch-curve | |
1009 | // The parametrization is the same as for the TPC and is taken from Lehrhaus. | |
1010 | // | |
1011 | ||
1012 | // This parameters have been adjusted to averaged values from GEANT | |
f57bb418 | 1013 | const Double_t kP1 = 7.17960e-02; |
1014 | const Double_t kP2 = 8.54196; | |
1015 | const Double_t kP3 = 1.38065e-06; | |
1016 | const Double_t kP4 = 5.30972; | |
1017 | const Double_t kP5 = 2.83798; | |
5c7f4665 | 1018 | |
f73816f5 | 1019 | // Lower cutoff of the Bethe-Bloch-curve to limit step sizes |
1020 | const Double_t kBgMin = 0.8; | |
1021 | const Double_t kBBMax = 6.83298; | |
f73816f5 | 1022 | |
1023 | if (bg > kBgMin) { | |
030b4415 | 1024 | Double_t yy = bg / TMath::Sqrt(1.0 + bg*bg); |
5c7f4665 | 1025 | Double_t aa = TMath::Power(yy,kP4); |
030b4415 | 1026 | Double_t bb = TMath::Power((1.0/bg),kP5); |
5c7f4665 | 1027 | bb = TMath::Log(kP3 + bb); |
030b4415 | 1028 | return ((kP2 - aa - bb) * kP1 / aa); |
5c7f4665 | 1029 | } |
f73816f5 | 1030 | else { |
1031 | return kBBMax; | |
1032 | } | |
d3f347ff | 1033 | |
fe4da5cc | 1034 | } |
5c7f4665 | 1035 | |
a328fff9 | 1036 | //_____________________________________________________________________________ |
c4214bc0 | 1037 | Double_t AliTRDv1::BetheBlochGeant(Double_t bg) |
a328fff9 | 1038 | { |
1039 | // | |
1040 | // Return dN/dx (number of primary collisions per centimeter) | |
1041 | // for given beta*gamma factor. | |
1042 | // | |
1043 | // Implemented by K.Oyama according to GEANT 3 parametrization shown in | |
1044 | // A.Andronic's webpage: http://www-alice.gsi.de/trd/papers/dedx/dedx.html | |
1045 | // This must be used as a set with IntSpecGeant. | |
1046 | // | |
1047 | ||
030b4415 | 1048 | Int_t i = 0; |
a328fff9 | 1049 | |
030b4415 | 1050 | Double_t arrG[20] = { 1.100000, 1.200000, 1.300000, 1.500000 |
1051 | , 1.800000, 2.000000, 2.500000, 3.000000 | |
1052 | , 4.000000, 7.000000, 10.000000, 20.000000 | |
1053 | , 40.000000, 70.000000, 100.000000, 300.000000 | |
1054 | , 600.000000, 1000.000000, 3000.000000, 10000.000000 }; | |
a328fff9 | 1055 | |
030b4415 | 1056 | Double_t arrNC[20] = { 75.009056, 45.508083, 35.299252, 27.116327 |
1057 | , 22.734999, 21.411915, 19.934095, 19.449375 | |
1058 | , 19.344431, 20.185553, 21.027925, 22.912676 | |
1059 | , 24.933352, 26.504053, 27.387468, 29.566597 | |
1060 | , 30.353779, 30.787134, 31.129285, 31.157350 }; | |
1061 | ||
1062 | // Betagamma to gamma | |
1063 | Double_t g = TMath::Sqrt(1.0 + bg*bg); | |
a328fff9 | 1064 | |
1065 | // Find the index just before the point we need. | |
030b4415 | 1066 | for (i = 0; i < 18; i++) { |
1067 | if ((arrG[i] < g) && | |
1068 | (arrG[i+1] > g)) { | |
a328fff9 | 1069 | break; |
030b4415 | 1070 | } |
1071 | } | |
a328fff9 | 1072 | |
1073 | // Simple interpolation. | |
030b4415 | 1074 | Double_t pp = ((arrNC[i+1] - arrNC[i]) / (arrG[i+1] - arrG[i])) |
1075 | * (g - arrG[i]) + arrNC[i]; | |
a328fff9 | 1076 | |
030b4415 | 1077 | return pp; |
a328fff9 | 1078 | |
1079 | } | |
1080 | ||
5c7f4665 | 1081 | //_____________________________________________________________________________ |
1082 | Double_t Ermilova(Double_t *x, Double_t *) | |
1083 | { | |
1084 | // | |
1085 | // Calculates the delta-ray energy distribution according to Ermilova. | |
1086 | // Logarithmic scale ! | |
1087 | // | |
1088 | ||
1089 | Double_t energy; | |
1090 | Double_t dpos; | |
1091 | Double_t dnde; | |
1092 | ||
030b4415 | 1093 | Int_t pos1; |
1094 | Int_t pos2; | |
5c7f4665 | 1095 | |
8230f242 | 1096 | const Int_t kNv = 31; |
5c7f4665 | 1097 | |
030b4415 | 1098 | Float_t vxe[kNv] = { 2.3026, 2.9957, 3.4012, 3.6889, 3.9120 |
1099 | , 4.0943, 4.2485, 4.3820, 4.4998, 4.6052 | |
1100 | , 4.7005, 5.0752, 5.2983, 5.7038, 5.9915 | |
1101 | , 6.2146, 6.5221, 6.9078, 7.3132, 7.6009 | |
1102 | , 8.0064, 8.5172, 8.6995, 8.9872, 9.2103 | |
1103 | , 9.4727, 9.9035, 10.3735, 10.5966, 10.8198 | |
1104 | , 11.5129 }; | |
1105 | ||
1106 | Float_t vye[kNv] = { 80.0, 31.0, 23.3, 21.1, 21.0 | |
1107 | , 20.9, 20.8, 20.0, 16.0, 11.0 | |
1108 | , 8.0, 6.0, 5.2, 4.6, 4.0 | |
1109 | , 3.5, 3.0, 1.4, 0.67, 0.44 | |
1110 | , 0.3, 0.18, 0.12, 0.08, 0.056 | |
1111 | , 0.04, 0.023, 0.015, 0.011, 0.01 | |
1112 | , 0.004 }; | |
5c7f4665 | 1113 | |
1114 | energy = x[0]; | |
1115 | ||
1116 | // Find the position | |
030b4415 | 1117 | pos1 = 0; |
1118 | pos2 = 0; | |
5c7f4665 | 1119 | dpos = 0; |
1120 | do { | |
1121 | dpos = energy - vxe[pos2++]; | |
1122 | } | |
1123 | while (dpos > 0); | |
1124 | pos2--; | |
030b4415 | 1125 | if (pos2 > kNv) { |
1126 | pos2 = kNv - 1; | |
1127 | } | |
5c7f4665 | 1128 | pos1 = pos2 - 1; |
1129 | ||
1130 | // Differentiate between the sampling points | |
1131 | dnde = (vye[pos1] - vye[pos2]) / (vxe[pos2] - vxe[pos1]); | |
1132 | ||
1133 | return dnde; | |
1134 | ||
1135 | } | |
a328fff9 | 1136 | |
1137 | //_____________________________________________________________________________ | |
1138 | Double_t IntSpecGeant(Double_t *x, Double_t *) | |
1139 | { | |
1140 | // | |
1141 | // Integrated spectrum from Geant3 | |
1142 | // | |
1143 | ||
96efaf83 | 1144 | const Int_t npts = 83; |
030b4415 | 1145 | Double_t arre[npts] = { 2.421257, 2.483278, 2.534301, 2.592230 |
1146 | , 2.672067, 2.813299, 3.015059, 3.216819 | |
1147 | , 3.418579, 3.620338, 3.868209, 3.920198 | |
1148 | , 3.978284, 4.063923, 4.186264, 4.308605 | |
1149 | , 4.430946, 4.553288, 4.724261, 4.837736 | |
1150 | , 4.999842, 5.161949, 5.324056, 5.486163 | |
1151 | , 5.679688, 5.752998, 5.857728, 5.962457 | |
1152 | , 6.067185, 6.171914, 6.315653, 6.393674 | |
1153 | , 6.471694, 6.539689, 6.597658, 6.655627 | |
1154 | , 6.710957, 6.763648, 6.816338, 6.876198 | |
1155 | , 6.943227, 7.010257, 7.106285, 7.252151 | |
1156 | , 7.460531, 7.668911, 7.877290, 8.085670 | |
1157 | , 8.302979, 8.353585, 8.413120, 8.483500 | |
1158 | , 8.541030, 8.592857, 8.668865, 8.820485 | |
1159 | , 9.037086, 9.253686, 9.470286, 9.686887 | |
1160 | , 9.930838, 9.994655, 10.085822, 10.176990 | |
1161 | , 10.268158, 10.359325, 10.503614, 10.627565 | |
1162 | , 10.804637, 10.981709, 11.158781, 11.335854 | |
1163 | , 11.593397, 11.781165, 12.049404, 12.317644 | |
1164 | , 12.585884, 12.854123, 14.278421, 16.975889 | |
1165 | , 20.829416, 24.682943, 28.536469 }; | |
1166 | ||
1167 | Double_t arrdnde[npts] = { 10.960000, 10.960000, 10.359500, 9.811340 | |
1168 | , 9.1601500, 8.206670, 6.919630, 5.655430 | |
1169 | , 4.6221300, 3.777610, 3.019560, 2.591950 | |
1170 | , 2.5414600, 2.712920, 3.327460, 4.928240 | |
1171 | , 7.6185300, 10.966700, 12.225800, 8.094750 | |
1172 | , 3.3586900, 1.553650, 1.209600, 1.263840 | |
1173 | , 1.3241100, 1.312140, 1.255130, 1.165770 | |
1174 | , 1.0594500, 0.945450, 0.813231, 0.699837 | |
1175 | , 0.6235580, 2.260990, 2.968350, 2.240320 | |
1176 | , 1.7988300, 1.553300, 1.432070, 1.535520 | |
1177 | , 1.4429900, 1.247990, 1.050750, 0.829549 | |
1178 | , 0.5900280, 0.395897, 0.268741, 0.185320 | |
1179 | , 0.1292120, 0.103545, 0.0949525, 0.101535 | |
1180 | , 0.1276380, 0.134216, 0.123816, 0.104557 | |
1181 | , 0.0751843, 0.0521745, 0.0373546, 0.0275391 | |
1182 | , 0.0204713, 0.0169234, 0.0154552, 0.0139194 | |
1183 | , 0.0125592, 0.0113638, 0.0107354, 0.0102137 | |
1184 | , 0.00845984, 0.00683338, 0.00556836, 0.00456874 | |
1185 | , 0.0036227, 0.00285991, 0.00226664, 0.00172234 | |
1186 | , 0.00131226, 0.00100284, 0.000465492, 7.26607e-05 | |
1187 | , 3.63304e-06, 0.0000000, 0.0000000 }; | |
1188 | ||
1189 | Int_t i; | |
a328fff9 | 1190 | Double_t energy = x[0]; |
a328fff9 | 1191 | |
030b4415 | 1192 | for (i = 0; i < npts; i++) { |
1193 | if (energy < arre[i]) { | |
1194 | break; | |
1195 | } | |
1196 | } | |
a328fff9 | 1197 | |
030b4415 | 1198 | if (i == 0) { |
1199 | AliErrorGeneral("AliTRDv1::IntSpecGeant","Given energy value is too small or zero"); | |
1200 | } | |
a328fff9 | 1201 | |
f57bb418 | 1202 | return arrdnde[i]; |
a328fff9 | 1203 | |
1204 | } |