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 Revision 1.12 1999/10/22 08:04:14 fca
19 Correct improper use of negative parameters
21 Revision 1.11 1999/10/16 19:30:05 fca
22 Corrected Rotation Matrix and CVS log
24 Revision 1.10 1999/10/15 15:35:20 fca
25 New version for frame1099 with and without holes
27 Revision 1.9 1999/09/29 09:24:33 fca
28 Introduction of the Copyright and cvs Log
32 ///////////////////////////////////////////////////////////////////////////////
34 // Time Of Flight: design of C.Williams FCA //
35 // This class contains the functions for version 1 of the Time Of Flight //
38 // VERSION WITH 5 MODULES AND TILTED STRIPS
40 // WITH HOLES FOR PHOS AND HMPID
41 // INSIDE A FULL COVERAGE SPACE FRAME
49 // University of Salerno - Italy
55 <img src="picts/AliTOFv2Class.gif">
59 ///////////////////////////////////////////////////////////////////////////////
69 //_____________________________________________________________________________
73 // Default constructor
77 //_____________________________________________________________________________
78 AliTOFv2::AliTOFv2(const char *name, const char *title)
82 // Standard constructor
86 //_____________________________________________________________________________
87 void AliTOFv2::CreateGeometry()
90 // Create geometry for Time Of Flight version 0
94 <img src="picts/AliTOFv2.gif">
98 // Creates common geometry
100 AliTOF::CreateGeometry();
103 //_____________________________________________________________________________
104 void AliTOFv2::TOFpc(Float_t xtof, Float_t ytof, Float_t zlen1,
105 Float_t zlen2, Float_t zlen3, Float_t ztof0)
108 // Definition of the Time Of Fligh Resistive Plate Chambers
109 // xFLT, yFLT, zFLT - sizes of TOF modules (large)
113 Float_t ycoor, zcoor;
116 Int_t *idtmed = fIdtmed->GetArray()-499;
122 gMC->Gsvolu("FTO1", "BOX ", idtmed[506], par, 3);
124 gMC->Gsvolu("FTO2", "BOX ", idtmed[506], par, 3);
126 gMC->Gsvolu("FTO3", "BOX ", idtmed[506], par, 3);
129 // Position of modules
130 Float_t zcor1 = ztof0 - zlen1/2;
131 Float_t zcor2 = ztof0 - zlen1 - zlen2/2.;
134 AliMatrix(idrotm[0], 90., 0., 0., 0., 90, -90.);
135 AliMatrix(idrotm[1], 90., 180., 0., 0., 90, 90.);
136 gMC->Gspos("FTO1", 1, "BTO1", 0, zcor1, 0, idrotm[0], "ONLY");
137 gMC->Gspos("FTO1", 2, "BTO1", 0, -zcor1, 0, idrotm[1], "ONLY");
138 gMC->Gspos("FTO1", 1, "BTO2", 0, zcor1, 0, idrotm[0], "ONLY");
139 gMC->Gspos("FTO1", 2, "BTO2", 0, -zcor1, 0, idrotm[1], "ONLY");
140 gMC->Gspos("FTO1", 1, "BTO3", 0, zcor1, 0, idrotm[0], "ONLY");
141 gMC->Gspos("FTO1", 2, "BTO3", 0, -zcor1, 0, idrotm[1], "ONLY");
143 gMC->Gspos("FTO2", 1, "BTO1", 0, zcor2, 0, idrotm[0], "ONLY");
144 gMC->Gspos("FTO2", 2, "BTO1", 0, -zcor2, 0, idrotm[1], "ONLY");
145 gMC->Gspos("FTO2", 1, "BTO2", 0, zcor2, 0, idrotm[0], "ONLY");
146 gMC->Gspos("FTO2", 2, "BTO2", 0, -zcor2, 0, idrotm[1], "ONLY");
148 gMC->Gspos("FTO3", 0, "BTO1", 0, zcor3, 0, idrotm[0], "ONLY");
150 // Subtraction the distance to TOF module boundaries
153 Float_t xFLT, yFLT, zFLT1, zFLT2, zFLT3;
155 xFLT = xtof -(.5 +.5)*2;
162 // Sizes of MRPC pads
164 Float_t yPad = 0.505;
166 // Large not sensitive volumes with CO2
170 cout <<"************************* TOF geometry **************************"<<endl;
172 par[2] = (zFLT1 / 2.);
173 gMC->Gsvolu("FLT1", "BOX ", idtmed[506], par, 3); // CO2
174 gMC->Gspos("FLT1", 0, "FTO1", 0., 0., 0., 0, "ONLY");
176 par[2] = (zFLT2 / 2.);
177 gMC->Gsvolu("FLT2", "BOX ", idtmed[506], par, 3); // CO2
178 gMC->Gspos("FLT2", 0, "FTO2", 0., 0., 0., 0, "ONLY");
180 par[2] = (zFLT3 / 2.);
181 gMC->Gsvolu("FLT3", "BOX ", idtmed[506], par, 3); // CO2
182 gMC->Gspos("FLT3", 0, "FTO3", 0., 0., 0., 0, "ONLY");
184 ////////// Layers before detector ////////////////////
186 // Alluminium layer in front 1.0 mm thick at the beginning
190 ycoor = -yFLT/2 + par[1];
191 gMC->Gsvolu("FMY1", "BOX ", idtmed[508], par, 3); // Alluminium
192 gMC->Gspos("FMY1", 0, "FLT1", 0., ycoor, 0., 0, "ONLY");
193 gMC->Gsvolu("FMY2", "BOX ", idtmed[508], par, 3); // Alluminium
194 gMC->Gspos("FMY2", 0, "FLT2", 0., ycoor, 0., 0, "ONLY");
195 gMC->Gsvolu("FMY3", "BOX ", idtmed[508], par, 3); // Alluminium
196 gMC->Gspos("FMY3", 0, "FLT3", 0., ycoor, 0., 0, "ONLY");
198 // Honeycomb layer (1cm of special polyethilene)
199 ycoor = ycoor + par[1];
203 ycoor = ycoor + par[1];
204 gMC->Gsvolu("FPL1", "BOX ", idtmed[503], par, 3); // Hony
205 gMC->Gspos("FPL1", 0, "FLT1", 0., ycoor, 0., 0, "ONLY");
206 gMC->Gsvolu("FPL2", "BOX ", idtmed[503], par, 3); // Hony
207 gMC->Gspos("FPL2", 0, "FLT2", 0., ycoor, 0., 0, "ONLY");
208 gMC->Gsvolu("FPL3", "BOX ", idtmed[503], par, 3); // Hony
209 gMC->Gspos("FPL3", 0, "FLT3", 0., ycoor, 0., 0, "ONLY");
211 ///////////////// Detector itself //////////////////////
213 const Float_t StripWidth = 7.81;//cm
214 const Float_t DeadBound = 1.;//cm non-sensitive between the pad edge and the boundary of the strip
215 const Int_t nx = 40; // number of pads along x
216 const Int_t nz = 2; // number of pads along z
217 const Float_t Gap=4.; //cm distance between the strip axis
218 const Float_t Space = 5.5; //cm distance from the front plate of the box
221 zSenStrip = StripWidth-2*DeadBound;//cm
225 par[2] = StripWidth/2.;
227 // Glass Layer of detector
228 gMC->Gsvolu("FSTR","BOX",idtmed[514],par,3);
230 // Freon for non-sesitive boundaries
234 gMC->Gsvolu("FNSF","BOX",idtmed[512],par,3);
235 gMC->Gspos("FNSF",0,"FSTR",0.,0.,0.,0,"ONLY");
236 // Mylar for non-sesitive boundaries
238 gMC->Gsvolu("FMYI","BOX",idtmed[510],par,3);
239 gMC->Gspos("FMYI",0,"FNSF",0.,0.,0.,0,"ONLY");
241 // Mylar for outer layers
243 ycoor = -yPad/2.+par[1];
244 gMC->Gsvolu("FMYX","BOX",idtmed[510],par,3);
245 gMC->Gspos("FMYX",1,"FSTR",0.,ycoor,0.,0,"ONLY");
246 gMC->Gspos("FMYX",2,"FSTR",0.,-ycoor,0.,0,"ONLY");
252 gMC->Gsvolu("FGRL","BOX",idtmed[502],par,3);
253 gMC->Gspos("FGRL",1,"FSTR",0.,ycoor,0.,0,"ONLY");
254 gMC->Gspos("FGRL",2,"FSTR",0.,-ycoor,0.,0,"ONLY");
256 // Freon sensitive layer
259 par[2] = zSenStrip/2.;
260 gMC->Gsvolu("FCFC","BOX",idtmed[513],par,3);
261 gMC->Gspos("FCFC",0,"FNSF",0.,0.,0.,0,"ONLY");
263 // Pad definition x & z
264 gMC->Gsdvn("FLZ","FCFC", nz, 3);
265 gMC->Gsdvn("FLX","FLZ" , nx, 1);
271 gMC->Gsvolu("FPAD", "BOX ", idtmed[513], par, 3);
272 gMC->Gspos("FPAD", 0, "FLX", 0., 0., 0., 0, "ONLY");
275 //// Positioning the Strips (FSTR) in the FLT volumes /////
279 Float_t t = zFLT1+zFLT2+zFLT3/2.+7.*2.5;//Half Width of Barrel
287 Int_t UpDown=-1; // UpDown=-1 -> Upper strip, UpDown=+1 -> Lower strip
292 AliMatrix (idrotm[nrot] ,90., 0.,90.-ang,90.,-ang,90.);
293 AliMatrix (idrotm[nrot+1],90.,180.,90.+ang,90.,ang,90.);
294 ycoor = -29./2.+ Space; //2 cm over front plate
295 ycoor += (1-(UpDown+1)/2)*Gap;
296 gMC->Gspos("FSTR",j,"FLT3",0.,ycoor,zcoor,idrotm[nrot],"ONLY");
297 gMC->Gspos("FSTR",j+1,"FLT3",0.,ycoor,-zcoor,idrotm[nrot+1],"ONLY");
300 zcoor=zcoor-(zSenStrip/2)/TMath::Cos(ang)+UpDown*Gap*TMath::Tan(ang)-(zSenStrip/2)/TMath::Cos(ang);
301 UpDown*= -1; // Alternate strips
304 } while (zcoor-(StripWidth/2)*TMath::Cos(ang)>-t+zFLT1+zFLT2+7*2.5);
306 ycoor = -29./2.+ Space; //2 cm over front plate
310 ang = atan(zpos/sqrt(2*t*t-zpos*zpos));
311 Offset = StripWidth*TMath::Cos(ang)/2;
315 // UpDown has not to be reinitialized, so that the arrangement of the strips can continue coherently
318 ang = atan(zpos/sqrt(2*t*t-zpos*zpos));
320 AliMatrix (idrotm[nrot], 90., 0., 90.-ang,90.,ang, 270.);
321 ycoor = -29./2.+ Space ; //2 cm over front plate
322 ycoor += (1-(UpDown+1)/2)*Gap;
323 zcoor = zpos+(zFLT3/2.+7+zFLT2/2); // Moves to the system of the centre of the modulus FLT2
324 gMC->Gspos("FSTR",i, "FLT2", 0., ycoor, zcoor,idrotm[nrot], "ONLY");
326 zpos = zpos - (zSenStrip/2)/TMath::Cos(ang)+UpDown*Gap*TMath::Tan(ang)-(zSenStrip/2)/TMath::Cos(ang);
327 last = StripWidth*TMath::Cos(ang)/2;
330 } while (zpos-(StripWidth/2)*TMath::Cos(ang)>-t+zFLT1+7);
334 ang = atan(zpos/sqrt(2*t*t-zpos*zpos));
335 Offset = StripWidth*TMath::Cos(ang)/2.;
339 ycoor= -29./2.+Space+Gap/2;
342 ang = atan(zpos/sqrt(2*t*t-zpos*zpos));
344 AliMatrix (idrotm[nrot], 90., 0., 90.-ang,90.,ang, 270.);
346 zcoor = zpos+(zFLT1/2+zFLT2+zFLT3/2+7.*2.);
347 gMC->Gspos("FSTR",i, "FLT1", 0., ycoor, zcoor,idrotm[nrot], "ONLY");
349 zpos = zpos - zSenStrip/TMath::Cos(ang);
350 last = StripWidth*TMath::Cos(ang)/2.;
351 } while (zpos>-t+7.+last);
353 printf("#######################################################\n");
354 printf(" Distance from the bound of the FLT3: zFLT3- %f cm \n", t+zpos-(zSenStrip/2)/TMath::Cos(ang));
355 ang = atan(zpos/sqrt(2*t*t-zpos*zpos));
356 zpos = zpos - zSenStrip/TMath::Cos(ang);
357 printf("NEXT Distance from the bound of the FLT3: zFLT3- %f cm \n", t+zpos-(zSenStrip/2)/TMath::Cos(ang));
358 printf("#######################################################\n");
360 ////////// Layers after detector /////////////////
362 // Honeycomb layer after (3cm)
364 Float_t OverSpace = Space + 7.3;
365 /// StripWidth*TMath::Sin(ang) + 1.3;
370 ycoor = -yFLT/2 + OverSpace + par[1];
371 gMC->Gsvolu("FPE1", "BOX ", idtmed[503], par, 3); // Hony
372 gMC->Gspos("FPE1", 0, "FLT1", 0., ycoor, 0., 0, "ONLY");
373 gMC->Gsvolu("FPE2", "BOX ", idtmed[503], par, 3); // Hony
374 gMC->Gspos("FPE2", 0, "FLT2", 0., ycoor, 0., 0, "ONLY");
375 gMC->Gsvolu("FPE3", "BOX ", idtmed[503], par, 3); // Hony
376 gMC->Gspos("FPE3", 0, "FLT3", 0., ycoor, 0., 0, "ONLY");
378 // Electronics (Cu) after
381 par[1] = 1.43*0.05 / 2.; // 5% of X0
384 gMC->Gsvolu("FEC1", "BOX ", idtmed[501], par, 3); // Cu
385 gMC->Gspos("FEC1", 0, "FLT1", 0., ycoor, 0., 0, "ONLY");
386 gMC->Gsvolu("FEC2", "BOX ", idtmed[501], par, 3); // Cu
387 gMC->Gspos("FEC2", 0, "FLT2", 0., ycoor, 0., 0, "ONLY");
388 gMC->Gsvolu("FEC3", "BOX ", idtmed[501], par, 3); // Cu
389 gMC->Gspos("FEC3", 0, "FLT3", 0., ycoor, 0., 0, "ONLY");
391 // Cooling water after
394 par[1] = 36.1*0.02 / 2.; // 2% of X0
397 gMC->Gsvolu("FWA1", "BOX ", idtmed[515], par, 3); // Water
398 gMC->Gspos("FWA1", 0, "FLT1", 0., ycoor, 0., 0, "ONLY");
399 gMC->Gsvolu("FWA2", "BOX ", idtmed[515], par, 3); // Water
400 gMC->Gspos("FWA2", 0, "FLT2", 0., ycoor, 0., 0, "ONLY");
401 gMC->Gsvolu("FWA3", "BOX ", idtmed[515], par, 3); // Water
402 gMC->Gspos("FWA3", 0, "FLT3", 0., ycoor, 0., 0, "ONLY");
404 //back plate honycomb (2cm)
408 ycoor = yFLT/2 - par[1];
409 gMC->Gsvolu("FEG1", "BOX ", idtmed[503], par, 3); // Hony
410 gMC->Gspos("FEG1", 0, "FLT1", 0., ycoor, 0., 0, "ONLY");
411 gMC->Gsvolu("FEG2", "BOX ", idtmed[503], par, 3); // Hony
412 gMC->Gspos("FEG2", 0, "FLT2", 0., ycoor, 0., 0, "ONLY");
413 gMC->Gsvolu("FEG3", "BOX ", idtmed[503], par, 3); // Hony
414 gMC->Gspos("FEG3", 0, "FLT3", 0., ycoor, 0., 0, "ONLY");
417 //_____________________________________________________________________________
418 void AliTOFv2::DrawModule()
421 // Draw a shaded view of the Time Of Flight version 1
423 // Set everything unseen
424 gMC->Gsatt("*", "seen", -1);
426 // Set ALIC mother transparent
427 gMC->Gsatt("ALIC","SEEN",0);
429 // Set the volumes visible
430 gMC->Gsatt("ALIC","SEEN",0);
431 gMC->Gsatt("FBAR","SEEN",1);
432 gMC->Gsatt("FTO1","SEEN",1);
433 gMC->Gsatt("FTO2","SEEN",1);
434 gMC->Gsatt("FTO3","SEEN",1);
435 gMC->Gsatt("FBT1","SEEN",1);
436 gMC->Gsatt("FBT2","SEEN",1);
437 gMC->Gsatt("FBT3","SEEN",1);
438 gMC->Gsatt("FDT1","SEEN",1);
439 gMC->Gsatt("FDT2","SEEN",1);
440 gMC->Gsatt("FDT3","SEEN",1);
441 gMC->Gsatt("FLT1","SEEN",1);
442 gMC->Gsatt("FLT2","SEEN",1);
443 gMC->Gsatt("FLT3","SEEN",1);
444 gMC->Gsatt("FPL1","SEEN",1);
445 gMC->Gsatt("FPL2","SEEN",1);
446 gMC->Gsatt("FPL3","SEEN",1);
447 gMC->Gsatt("FLD1","SEEN",1);
448 gMC->Gsatt("FLD2","SEEN",1);
449 gMC->Gsatt("FLD3","SEEN",1);
450 gMC->Gsatt("FLZ1","SEEN",1);
451 gMC->Gsatt("FLZ2","SEEN",1);
452 gMC->Gsatt("FLZ3","SEEN",1);
453 gMC->Gsatt("FLX1","SEEN",1);
454 gMC->Gsatt("FLX2","SEEN",1);
455 gMC->Gsatt("FLX3","SEEN",1);
456 gMC->Gsatt("FPA0","SEEN",1);
458 gMC->Gdopt("hide", "on");
459 gMC->Gdopt("shad", "on");
460 gMC->Gsatt("*", "fill", 7);
461 gMC->SetClipBox(".");
462 gMC->SetClipBox("*", 0, 1000, -1000, 1000, -1000, 1000);
464 gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .02, .02);
465 gMC->Gdhead(1111, "Time Of Flight");
466 gMC->Gdman(18, 4, "MAN");
467 gMC->Gdopt("hide","off");
470 //_____________________________________________________________________________
471 void AliTOFv2::CreateMaterials()
474 // Define materials for the Time Of Flight
476 AliTOF::CreateMaterials();
479 //_____________________________________________________________________________
480 void AliTOFv2::Init()
483 // Initialise the detector after the geometry has been defined
485 printf("**************************************"
487 "**************************************\n");
488 printf("\n Version 2 of TOF initialing, "
489 "with openings for PHOS and RICH in symmetric frame\n\n");
494 // Check that FRAME is there otherwise we have no place where to
496 AliModule* FRAME=gAlice->GetModule("FRAME");
498 Error("Ctor","TOF needs FRAME to be present\n");
501 if(FRAME->IsVersion()!=1) {
502 Error("Ctor","FRAME version 1 needed with this version of TOF\n");
506 fIdFTO2=gMC->VolId("FTO2");
507 fIdFTO3=gMC->VolId("FTO3");
508 fIdFLT1=gMC->VolId("FLT1");
509 fIdFLT2=gMC->VolId("FLT2");
510 fIdFLT3=gMC->VolId("FLT3");
511 printf("**************************************"
513 "**************************************\n");
516 //_____________________________________________________________________________
517 void AliTOFv2::StepManager()
520 // Procedure called at each step in the Time Of Flight
522 TLorentzVector mom, pos;
526 Int_t *idtmed = fIdtmed->GetArray()-499;
527 if(gMC->GetMedium()==idtmed[514-1] &&
528 gMC->IsTrackEntering() && gMC->TrackCharge()
529 && gMC->CurrentVolID(copy)==fIdSens) {
530 TClonesArray &lhits = *fHits;
532 // Record only charged tracks at entrance
533 gMC->CurrentVolOffID(1,copy);
535 gMC->CurrentVolOffID(3,copy);
537 id=gMC->CurrentVolOffID(8,copy);
541 id=gMC->CurrentVolOffID(5,copy);
542 if(id==fIdFLT3) vol[1]+=6;
543 } else if (id==fIdFTO2) {
545 id=gMC->CurrentVolOffID(5,copy);
546 if(id==fIdFLT2) vol[1]+=8;
548 id=gMC->CurrentVolOffID(5,copy);
549 if(id==fIdFLT1) vol[1]+=14;
551 gMC->TrackPosition(pos);
552 gMC->TrackMomentum(mom);
554 Double_t ptot=mom.Rho();
555 Double_t norm=1/ptot;
558 hits[i+3]=mom[i]*norm;
562 new(lhits[fNhits++]) AliTOFhit(fIshunt,gAlice->CurrentTrack(),vol,hits);