1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 ///////////////////////////////////////////////////////////////////////////////
20 // Transition Radiation Detector //
21 // This class contains the basic functions for the Transition Radiation //
24 ///////////////////////////////////////////////////////////////////////////////
26 #include <TGeoGlobalMagField.h>
27 #include <TVirtualMC.h>
28 #include <TGeoManager.h>
35 #include "AliTRDdigitizer.h"
36 #include "AliTRDdigitsManager.h"
37 #include "AliTRDgeometry.h"
38 #include "AliTRDhit.h"
39 #include "AliTRDrawData.h"
40 #include "AliTRDCommonParam.h"
44 //_____________________________________________________________________________
53 // Default constructor
58 //_____________________________________________________________________________
59 AliTRD::AliTRD(const char *name, const char *title)
60 :AliDetector(name,title)
67 // Standard constructor for the TRD
70 // Check that FRAME is there otherwise we have no place where to put TRD
71 AliModule *frame = gAlice->GetModule("FRAME");
73 AliError("TRD needs FRAME to be present\n");
77 // Define the TRD geometry
78 if ((frame->IsVersion() == 0) ||
79 (frame->IsVersion() == 1)) {
80 fGeometry = new AliTRDgeometry();
83 AliError("Could not find valid FRAME version\n");
87 // Allocate the hit array
88 fHits = new TClonesArray("AliTRDhit",405);
89 gAlice->GetMCApp()->AddHitList(fHits);
93 //_____________________________________________________________________________
112 //_____________________________________________________________________________
113 void AliTRD::Hits2Digits()
119 AliTRDdigitizer digitizer("TRDdigitizer","TRD digitizer class");
120 AliLog::SetClassDebugLevel("TRDdigitizer",AliDebugLevel());
123 digitizer.InitDetector();
125 if (!fLoader->TreeH()) {
126 fLoader->LoadHits("read");
128 fLoader->LoadDigits("recreate");
130 AliRunLoader *runLoader = fLoader->GetRunLoader();
132 for (Int_t iEvent = 0; iEvent < runLoader->GetNumberOfEvents(); iEvent++) {
133 runLoader->GetEvent(iEvent);
134 digitizer.Open(runLoader,iEvent);
135 digitizer.MakeDigits();
136 digitizer.WriteDigits();
139 fLoader->UnloadHits();
140 fLoader->UnloadDigits();
144 //_____________________________________________________________________________
145 void AliTRD::Hits2SDigits()
148 // Create summable digits
151 AliTRDdigitizer digitizer("TRDdigitizer","TRD digitizer class");
152 // For the summable digits
153 digitizer.SetSDigits(kTRUE);
154 AliLog::SetClassDebugLevel("TRDdigitizer",AliDebugLevel());
157 digitizer.InitDetector();
159 if (!fLoader->TreeH()) {
160 fLoader->LoadHits("read");
162 fLoader->LoadSDigits("recreate");
164 AliRunLoader *runLoader = fLoader->GetRunLoader();
166 for (Int_t iEvent = 0; iEvent < runLoader->GetNumberOfEvents(); iEvent++) {
167 runLoader->GetEvent(iEvent);
168 digitizer.Open(runLoader,iEvent);
169 digitizer.MakeDigits();
170 digitizer.WriteDigits();
173 fLoader->UnloadHits();
174 fLoader->UnloadSDigits();
178 //_____________________________________________________________________________
179 AliDigitizer *AliTRD::CreateDigitizer(AliRunDigitizer *manager) const
182 // Creates a new digitizer object
185 return new AliTRDdigitizer(manager);
189 //_____________________________________________________________________________
190 void AliTRD::SDigits2Digits()
193 // Create final digits from summable digits
196 // Create the TRD digitizer
197 AliTRDdigitizer digitizer("TRDdigitizer","TRD digitizer class");
198 AliLog::SetClassDebugLevel("TRDdigitizer",AliDebugLevel());
201 digitizer.SetEvent(gAlice->GetEvNumber());
204 digitizer.InitDetector();
206 // Read the s-digits via digits manager
207 AliTRDdigitsManager sdigitsManager;
209 AliLog::SetClassDebugLevel("TRDdigitisManager",AliDebugLevel());
210 sdigitsManager.SetSDigits(kTRUE);
211 sdigitsManager.CreateArrays();
213 if (!fLoader->TreeS()) {
214 if (fLoader->LoadSDigits("read")) {
218 if (!fLoader->TreeS()) {
219 AliError(Form("Error while reading SDigits for event %d",gAlice->GetEvNumber()));
223 sdigitsManager.ReadDigits(fLoader->TreeS());
225 // Add the s-digits to the input list
226 digitizer.AddSDigitsManager(&sdigitsManager);
228 // Convert the s-digits to normal digits
229 digitizer.SDigits2Digits();
232 if (!fLoader->TreeD()) {
233 fLoader->MakeTree("D");
235 if (digitizer.MakeBranch(fLoader->TreeD())){
236 digitizer.WriteDigits();
241 //_____________________________________________________________________________
242 void AliTRD::Digits2Raw()
245 // Convert digits of the current event to raw data
248 fLoader->LoadDigits();
249 TTree *digits = fLoader->TreeD();
251 AliError("No digits tree");
255 AliTRDrawData rawWriter;
256 if (!rawWriter.Digits2Raw(digits)) {
257 AliError("The raw writer could not load the digits tree");
260 fLoader->UnloadDigits();
264 //_____________________________________________________________________________
265 void AliTRD::AddHit(Int_t track, Int_t det, Float_t *hits, Int_t q
266 , Float_t time, Bool_t inDrift)
269 // Add a hit for the TRD
272 TClonesArray &lhits = *fHits;
273 AliTRDhit *hit = new(lhits[fNhits++]) AliTRDhit(fIshunt
284 hit->SetAmplification();
293 //_____________________________________________________________________________
294 void AliTRD::CreateGeometry()
297 // Creates the volumes for the TRD chambers
300 // Check that FRAME is there otherwise we have no place where to put the TRD
301 AliModule *frame = gAlice->GetModule("FRAME");
303 AliFatal("The TRD needs the FRAME to be defined first");
306 fGeometry->CreateGeometry(fIdtmed->GetArray() - 1299);
310 //_____________________________________________________________________________
311 void AliTRD::CreateMaterials()
314 // Create the materials for the TRD
317 Int_t isxfld = ((AliMagF *) TGeoGlobalMagField::Instance()->GetField())->Integ();
318 Float_t sxmgmx = ((AliMagF *) TGeoGlobalMagField::Instance()->GetField())->Max();
320 //////////////////////////////////////////////////////////////////////////
322 //////////////////////////////////////////////////////////////////////////
325 AliMaterial( 1,"Al", 26.98, 13.0, 2.7, 8.9, 37.2);
327 AliMaterial( 2,"Cu", 63.54, 29.0, 8.96, 1.43, 14.8);
329 AliMaterial( 3,"C" , 12.01, 6.0, 2.265, 18.8, 74.4);
330 // Carbon for fiber mats
331 AliMaterial( 4,"C2", 12.01, 6.0, 1.75, 18.8, 74.4);
333 AliMaterial( 5,"Sn", 118.71, 50.0, 7.31, 1.21, 14.8);
335 AliMaterial( 6,"Si", 28.09, 14.0, 2.33, 9.36, 37.2);
337 AliMaterial( 7,"Fe", 55.85, 26.0, 7.87, 1.76, 14.8);
340 Float_t aAir[4] = { 12.011 , 14.0 , 15.9994 , 36.0 };
341 Float_t zAir[4] = { 6.0 , 7.0 , 8.0 , 18.0 };
342 Float_t wAir[4] = { 0.000124, 0.755267, 0.231781, 0.012827 };
343 Float_t dAir = 1.20479e-03;
344 AliMixture(51,"Air", aAir, zAir, dAir, 4, wAir );
345 // Polyethilene (CH2)
346 Float_t ape[2] = { 12.011 , 1.0079 };
347 Float_t zpe[2] = { 6.0 , 1.0 };
348 Float_t wpe[2] = { 1.0 , 2.0 };
350 AliMixture(52,"Polyethilene", ape, zpe, dpe, -2, wpe );
352 // Xe/CO2-gas-mixture (85% / 15%)
353 Float_t aXeCO2[3] = { 131.29 , 12.0107 , 15.9994 };
354 Float_t zXeCO2[3] = { 54.0 , 6.0 , 8.0 };
355 Float_t wXeCO2[3] = { 8.5 , 1.5 , 3.0 };
357 Float_t dxe = 0.00549; // at 20C
358 Float_t dco = 0.00186; // at 20C
359 Float_t dgmXe = fxc * dxe + (1.0 - fxc) * dco;
360 // Ar/CO2-gas-mixture
361 Float_t aArCO2[3] = { 39.948 , 12.0107 , 15.9994 };
362 Float_t zArCO2[3] = { 18.0 , 6.0 , 8.0 };
363 Float_t wArCO2[3] = { 8.2 , 1.8 , 3.6 };
365 Float_t dar = 0.00166; // at 20C
366 Float_t dgmAr = fac * dar + (1.0 - fac) * dco;
367 if (AliTRDCommonParam::Instance()->IsXenon()) {
368 AliMixture(53,"XeCO2", aXeCO2, zXeCO2, dgmXe, -3, wXeCO2);
370 else if (AliTRDCommonParam::Instance()->IsArgon()) {
371 AliInfo("Gas mixture: Ar C02 (80/20)");
372 AliMixture(53,"ArCO2", aArCO2, zArCO2, dgmAr, -3, wArCO2);
375 AliFatal("Wrong gas mixture");
379 Float_t aG10[4] = { 1.0079, 12.011 , 15.9994, 28.086 };
380 Float_t zG10[4] = { 1.0 , 6.0 , 8.0 , 14.0 };
381 Float_t wG10[4] = { 0.023 , 0.194 , 0.443 , 0.340 };
383 AliMixture(54,"G10", aG10, zG10, dG10, 4,wG10 );
385 Float_t awa[2] = { 1.0079, 15.9994 };
386 Float_t zwa[2] = { 1.0 , 8.0 };
387 Float_t wwa[2] = { 2.0 , 1.0 };
389 AliMixture(55,"Water", awa, zwa, dwa, -2,wwa );
390 // Rohacell (C5H8O2), X0 = 535.005cm
391 Float_t arh[3] = { 12.011 , 1.0079, 15.9994 };
392 Float_t zrh[3] = { 6.0 , 1.0 , 8.0 };
393 Float_t wrh[3] = { 5.0 , 8.0 , 2.0 };
395 AliMixture(56,"Rohacell", arh, zrh, drh, -3,wrh );
397 Float_t aEpoxy[3] = { 15.9994, 1.0079, 12.011 };
398 Float_t zEpoxy[3] = { 8.0 , 1.0 , 6.0 };
399 Float_t wEpoxy[3] = { 3.0 , 19.0 , 18.0 };
400 Float_t dEpoxy = 1.8 ;
401 AliMixture(57,"Epoxy", aEpoxy,zEpoxy,dEpoxy,-3,wEpoxy);
402 // Araldite, low density epoxy (C18H19O3)
403 Float_t aAral[3] = { 15.9994, 1.0079, 12.011 };
404 Float_t zAral[3] = { 8.0 , 1.0 , 6.0 };
405 Float_t wAral[3] = { 3.0 , 19.0 , 18.0 };
406 Float_t dAral = 1.12; // Hardener: 1.15, epoxy: 1.1, mixture: 1/2
407 AliMixture(58,"Araldite", aAral, zAral, dAral, -3,wAral );
409 Float_t aMy[3] = { 12.011 , 1.0 , 15.9994 };
410 Float_t zMy[3] = { 6.0 , 1.0 , 8.0 };
411 Float_t wMy[3] = { 5.0 , 4.0 , 2.0 };
413 AliMixture(59,"Mylar", aMy, zMy, dMy, -3,wMy );
414 // Polypropylene (C3H6) for radiator fibers
415 Float_t app[2] = { 12.011 , 1.0079 };
416 Float_t zpp[2] = { 6.0 , 1.0 };
417 Float_t wpp[2] = { 3.0 , 6.0 };
419 AliMixture(60,"Polypropylene",app, zpp, dpp, -2,wpp );
420 // Aramide for honeycomb
421 Float_t aAra[4] = { 1.0079, 12.011 , 15.9994, 14.0067 };
422 Float_t zAra[4] = { 1.0 , 6.0 , 8.0 , 7.0 };
423 Float_t wAra[4] = { 3.0 , 1.0 , 1.0 , 1.0 };
424 Float_t dAra = 0.032;
425 AliMixture(61,"Aramide", aAra, zAra, dAra, -4,wAra );
426 // GFK for Wacosit (Epoxy + Si)
427 Float_t aGFK[4] = { 1.0079, 12.011 , 15.9994, 28.086 };
428 Float_t zGFK[4] = { 1.0 , 6.0 , 8.0 , 14.0 };
429 Float_t wGFK[4] = { 0.0445, 0.5031, 0.1118, 0.340 };
431 AliMixture(62,"GFK", aGFK, zGFK, dGFK, 4,wGFK );
433 //////////////////////////////////////////////////////////////////////////
434 // Tracking Media Parameters
435 //////////////////////////////////////////////////////////////////////////
437 // General tracking parameter
438 Float_t tmaxfd = -10.0;
439 Float_t stemax = -1.0e10;
440 Float_t deemax = -0.1;
441 Float_t epsil = 1.0e-4;
442 Float_t stmin = -0.001;
445 AliMedium( 1,"Al Frame" , 1,0,isxfld,sxmgmx
446 ,tmaxfd,stemax,deemax,epsil,stmin);
448 AliMedium( 2,"Air" ,51,0,isxfld,sxmgmx
449 ,tmaxfd,stemax,deemax,epsil,stmin);
451 AliMedium( 3,"Wires" , 2,0,isxfld,sxmgmx
452 ,tmaxfd,stemax,deemax,epsil,stmin);
453 // All other ROB materials (caps, etc.)
454 AliMedium( 4,"ROB Other" , 2,0,isxfld,sxmgmx
455 ,tmaxfd,stemax,deemax,epsil,stmin);
457 AliMedium( 5,"Padplane" , 2,1,isxfld,sxmgmx
458 ,tmaxfd,stemax,deemax,epsil,stmin);
460 AliMedium( 6,"Readout" , 2,0,isxfld,sxmgmx
461 ,tmaxfd,stemax,deemax,epsil,stmin);
463 AliMedium( 7,"Wacosit" ,62,0,isxfld,sxmgmx
464 ,tmaxfd,stemax,deemax,epsil,stmin);
465 // INOX of cooling bus bars
466 AliMedium( 8,"Cooling bus", 7,0,isxfld,sxmgmx
467 ,tmaxfd,stemax,deemax,epsil,stmin);
468 // Gas-mixture (Xe/CO2)
469 AliMedium( 9,"Gas-mix" ,53,1,isxfld,sxmgmx
470 ,tmaxfd,stemax,deemax,epsil,stmin);
472 AliMedium(10,"Honeycomb" ,61,0,isxfld,sxmgmx
473 ,tmaxfd,stemax,deemax,epsil,stmin);
475 AliMedium(11,"Glue" ,58,0,isxfld,sxmgmx
476 ,tmaxfd,stemax,deemax,epsil,stmin);
478 AliMedium(13,"G10-plates" ,54,0,isxfld,sxmgmx
479 ,tmaxfd,stemax,deemax,epsil,stmin);
481 AliMedium(14,"Water" ,55,0,isxfld,sxmgmx
482 ,tmaxfd,stemax,deemax,epsil,stmin);
483 // Rohacell for the radiator
484 AliMedium(15,"Rohacell" ,56,0,isxfld,sxmgmx
485 ,tmaxfd,stemax,deemax,epsil,stmin);
487 AliMedium(16,"MCM-Al" , 1,0,isxfld,sxmgmx
488 ,tmaxfd,stemax,deemax,epsil,stmin);
490 AliMedium(17,"MCM-Sn" , 5,0,isxfld,sxmgmx
491 ,tmaxfd,stemax,deemax,epsil,stmin);
493 AliMedium(18,"MCM-Cu" , 2,0,isxfld,sxmgmx
494 ,tmaxfd,stemax,deemax,epsil,stmin);
496 AliMedium(19,"MCM-G10" ,54,0,isxfld,sxmgmx
497 ,tmaxfd,stemax,deemax,epsil,stmin);
498 // Si in readout chips
499 AliMedium(20,"Chip-Si" , 6,0,isxfld,sxmgmx
500 ,tmaxfd,stemax,deemax,epsil,stmin);
501 // Epoxy in readout chips
502 AliMedium(21,"Chip-Ep" ,57,0,isxfld,sxmgmx
503 ,tmaxfd,stemax,deemax,epsil,stmin);
505 AliMedium(22,"Conn-PE" ,52,0,isxfld,sxmgmx
506 ,tmaxfd,stemax,deemax,epsil,stmin);
508 AliMedium(23,"Chip-Cu" , 2,0,isxfld,sxmgmx
509 ,tmaxfd,stemax,deemax,epsil,stmin);
510 // Al of cooling pipes
511 AliMedium(24,"Cooling" , 1,0,isxfld,sxmgmx
512 ,tmaxfd,stemax,deemax,epsil,stmin);
514 AliMedium(25,"Serv-Cu" , 2,0,isxfld,sxmgmx
515 ,tmaxfd,stemax,deemax,epsil,stmin);
517 AliMedium(26,"Carbon" , 4,0,isxfld,sxmgmx
518 ,tmaxfd,stemax,deemax,epsil,stmin);
520 AliMedium(27,"Mylar" ,59,0,isxfld,sxmgmx
521 ,tmaxfd,stemax,deemax,epsil,stmin);
522 // Polypropylene fibers
523 AliMedium(28,"Fiber" ,60,0,isxfld,sxmgmx
524 ,tmaxfd,stemax,deemax,epsil,stmin);
526 // Save the density values for the TRD absorbtion
529 if (AliTRDCommonParam::Instance()->IsXenon()) {
531 fGasNobleFraction = fxc;
533 else if (AliTRDCommonParam::Instance()->IsArgon()) {
535 fGasNobleFraction = fac;
540 //_____________________________________________________________________________
544 // Initialize the TRD detector after the geometry has been created
547 AliDebug(1,"++++++++++++++++++++++++++++++++++++++++++++++");
549 if (fGeometry->IsVersion() != 1) {
550 AliError("Not a valid geometry");
553 // Special tracking options for charged particles for XeCO2
554 gMC->Gstpar((* fIdtmed)[9],"DRAY" , 1.0);
555 gMC->Gstpar((* fIdtmed)[9],"STRA" , 1.0);
556 gMC->Gstpar((* fIdtmed)[9],"LOSS" ,13.0); // Specific energy loss
557 // Parameters specific to Fluka
558 //gMC->Gstpar((* fIdtmed)[9],"PRIMIO_E",23.53); // 1st ionisation potential
559 //gMC->Gstpar((* fIdtmed)[9],"PRIMIO_N",19.344431); // Number of primaries
563 //_____________________________________________________________________________
564 void AliTRD::ResetDigits()
567 // Reset number of digits and the digits array for this detector
578 //_____________________________________________________________________________
579 void AliTRD::SetTreeAddress()
582 // Set the branch addresses for the trees.
585 if (fLoader->TreeH() &&
587 fHits = new TClonesArray("AliTRDhit",405);
589 AliDetector::SetTreeAddress();
593 //_____________________________________________________________________________
594 Bool_t AliTRD::Raw2SDigits(AliRawReader *rawReader)
597 // Converts RAW data to SDigits
600 AliLoader *loader = fRunLoader->GetLoader("TRDLoader");
602 AliError("Can not get TRD loader from Run Loader");
607 tree = loader->TreeS();
609 loader->MakeTree("S");
610 tree = loader->TreeS();
613 AliTRDrawData *rawdata = new AliTRDrawData();
614 AliTRDdigitsManager *sdigitsManager = rawdata->Raw2Digits(rawReader);
615 if (sdigitsManager) {
616 sdigitsManager->SetSDigits(kTRUE);
617 sdigitsManager->MakeBranch(tree);
618 sdigitsManager->WriteDigits();
627 //_____________________________________________________________________________
628 AliLoader* AliTRD::MakeLoader(const char* topfoldername)
630 fLoader = new AliLoader(GetName(),topfoldername);
632 AliInfo("Adding Tracklets-loader");
633 AliDataLoader *dl = new AliDataLoader("TRD.Tracklets.root","tracklets", "tracklets");
634 fLoader->AddDataLoader(dl);
635 dl = new AliDataLoader("TRD.GtuTracks.root", "gtutracks", "gtutracks");
636 fLoader->AddDataLoader(dl);
640 //_____________________________________________________________________________
641 AliTRD &AliTRD::operator=(const AliTRD &trd)
644 // Assignment operator
648 ((AliTRD &) trd).Copy(*this);