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 1999/10/08 06:27:23 fca
19 Corrected bug in the HV degrader geometry, thanks to G.Tabary
21 Revision 1.11 1999/10/04 13:39:54 fca
22 Correct array index problem
24 Revision 1.10 1999/09/29 09:24:34 fca
25 Introduction of the Copyright and cvs Log
29 ///////////////////////////////////////////////////////////////////////////////
31 // Time Projection Chamber version 0 -- "coarse" TPC //
35 <img src="picts/AliTPCv0Class.gif">
40 ///////////////////////////////////////////////////////////////////////////////
43 #include <TGeometry.h>
54 #include "AliTPCParam.h"
59 //_____________________________________________________________________________
60 AliTPCv0::AliTPCv0(const char *name, const char *title)
64 // Standard creator for TPC version 0
68 //_____________________________________________________________________________
69 void AliTPCv0::CreateGeometry()
72 // Creation of the TPC coarse geometry (version 0)
73 // Origin Marek Kowalski Crakow
77 <img src="picts/AliTPCv0.gif">
82 <img src="picts/AliTPCv0Tree.gif">
86 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
88 Int_t *idtmed = fIdtmed->GetArray();
96 // ----------------------------------------------------
97 // FIELD CAGE WITH ENDCAPS - G10
98 // THIS IS ALSO A TPC MOTHER VOLUME
99 // ----------------------------------------------------
105 gMC->Gsvolu("TPC ", "TUBE", idtmed[8], dm, 3);
107 //-----------------------------------------------------
108 // Endcap cover c-fibre 0.86% X0
109 //-----------------------------------------------------
115 gMC->Gsvolu("TPEC","TUBE",idtmed[10],dm,3);
117 //-----------------------------------------------------
118 // Drift gas , leave 2 cm at the outer radius
120 //-----------------------------------------------------
126 gMC->Gsvolu("TGAS", "TUBE", idtmed[3], dm, 3);
129 //------------------------------------------------------
130 // membrane holder - carbon fiber
131 //------------------------------------------------------
134 gMC->Gsvolu("TPMH","TUBE",idtmed[6],dm,0);
140 gMC->Gsposp("TPMH",1,"TGAS",0.,0.,0.,0,"ONLY",dm,3);
146 gMC->Gsposp("TPMH",2,"TGAS",0.,0.,0.,0,"ONLY",dm,3);
148 //----------------------------------------------------------
149 // HV membrane - 25 microns of mylar
150 //----------------------------------------------------------
156 gMC->Gsvolu("TPHV","TUBE",idtmed[5],dm,3);
158 gMC->Gspos("TPHV",1,"TGAS",0.,0.,0.,0,"ONLY");
160 gMC->Gspos("TGAS",1,"TPC ",0.,0.,0.,0,"ONLY");
162 //----------------------------------------------------------
163 // "side" gas volume, the same as the drift gas
164 // the readout chambers are placed there.
165 //----------------------------------------------------------
169 dm[2] = 0.5*(275. - 250.);
171 gMC->Gsvolu("TPSG", "TUBE", idtmed[2], dm, 3);
173 Float_t z_side = dm[2]; // 1/2 of the side gas thickness
175 //-----------------------------------------------------------
176 // Readout chambers , 25% of X0, I use Al as the material
177 //-----------------------------------------------------------
179 Float_t InnerOpenAngle = fTPCParam->GetInnerAngle();
180 Float_t OuterOpenAngle = fTPCParam->GetOuterAngle();
182 Float_t InnerAngleShift = fTPCParam->GetInnerAngleShift();
183 Float_t OuterAngleShift = fTPCParam->GetOuterAngleShift();
186 Int_t nInnerSector = fTPCParam->GetNInnerSector()/2;
187 Int_t nOuterSector = fTPCParam->GetNOuterSector()/2;
190 Float_t InSecLowEdge = fTPCParam->GetInSecLowEdge();
191 Float_t InSecUpEdge = fTPCParam->GetInSecUpEdge();
193 Float_t OuSecLowEdge = fTPCParam->GetOuSecLowEdge();
194 Float_t OuSecUpEdge = fTPCParam->GetOuSecUpEdge();
196 Float_t SecThick = 2.225; // Al
198 Float_t edge = fTPCParam->GetEdge();
202 dm[0] = InSecLowEdge*TMath::Tan(0.5*InnerOpenAngle)-edge;
203 dm[1] = InSecUpEdge*TMath::Tan(0.5*InnerOpenAngle)-edge;
205 dm[3] = 0.5*(InSecUpEdge-InSecLowEdge);
207 Float_t xCenterS = InSecLowEdge+dm[3];
209 gMC->Gsvolu("TRCS", "TRD1", idtmed[0], dm, 4);
213 dm[0] = OuSecLowEdge*TMath::Tan(0.5*OuterOpenAngle)-edge;
214 dm[1] = OuSecUpEdge*TMath::Tan(0.5*OuterOpenAngle)-edge;
216 dm[3] = 0.5*(OuSecUpEdge-OuSecLowEdge);
218 Float_t xCenterL = OuSecLowEdge+dm[3];
220 gMC->Gsvolu("TRCL", "TRD1", idtmed[0], dm, 4);
222 Float_t z1 = -z_side + SecThick*0.5;
224 //------------------------------------------------------------------
225 // Positioning of the S-sector readout chambers
226 //------------------------------------------------------------------
229 Float_t theta1,theta2,theta3;
230 Float_t phi1,phi2,phi3;
234 for(ns=0;ns<nInnerSector;ns++){
236 phi1 = ns * InnerOpenAngle + 270.*kDegrad + InnerAngleShift;
237 phi1 *= kRaddeg; // in degrees
239 phi1 = (Float_t)TMath::Nint(phi1);
241 if (phi1 > 360.) phi1 -= 360.;
246 phi3 = ns * InnerOpenAngle + InnerAngleShift;
247 phi3 *= kRaddeg; // in degrees
249 phi3 = (Float_t)TMath::Nint(phi3);
251 if(phi3 > 360.) phi3 -= 360.;
255 alpha = phi3*kDegrad;
257 x = xCenterS * TMath::Cos(alpha);
258 y = xCenterS * TMath::Sin(alpha);
260 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
262 gMC->Gspos("TRCS", ns+1, "TPSG", x, y, z1, idrotm[nRotMat], "ONLY");
268 //-------------------------------------------------------------------
269 // Positioning of the L-sectors readout chambers
270 //-------------------------------------------------------------------
272 for(ns=0;ns<nOuterSector;ns++){
273 phi1 = ns * OuterOpenAngle + 270.*kDegrad + OuterAngleShift;
274 phi1 *= kRaddeg; // in degrees
276 phi1 = (Float_t)TMath::Nint(phi1);
279 if (phi1 > 360.) phi1 -= 360.;
284 phi3 = ns * OuterOpenAngle+OuterAngleShift;
285 phi3 *= kRaddeg; // in degrees
287 phi3 = (Float_t)TMath::Nint(phi3);
290 if(phi3 > 360.) phi3 -= 360.;
294 alpha = phi3*kDegrad;
296 x = xCenterL * TMath::Cos(alpha);
297 y = xCenterL * TMath::Sin(alpha);
299 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
302 gMC->Gspos("TRCL", ns+1, "TPSG", x, y, z1, idrotm[nRotMat], "ONLY");
308 Float_t z0 = z_side - 0.95;
310 gMC->Gspos("TPEC",1,"TPSG",0.,0.,z0,0,"ONLY");
312 // ==========================================================
314 // ==========================================================
317 // auxilary structures
321 gMC->Gsvolu("TPWI","TUBE",idtmed[24],dm,0); // "air"
323 // ----------------------------------------------------------
324 // Large wheel -> positioned in the TPC
325 // ----------------------------------------------------------
328 z0 = 263.5; // TPC length - 1/2 spoke wheel width
334 gMC->Gsvolu("TPWL", "TUBE", idtmed[0], dm, 3);
340 gMC->Gsposp("TPWI",1,"TPWL",0.,0.,0.,0,"ONLY",dm,3);
342 gMC->Gspos("TPWL", 1, "TPC ", 0, 0, z0, 0, "ONLY");
343 gMC->Gspos("TPWL", 2, "TPC ", 0, 0, -z0, 0, "ONLY");
346 // Outer vessel + CO2 HV degrader
353 gMC->Gsvolu("TPCO","TUBE",idtmed[12],dm,3);
358 gMC->Gsvolu("TPOV","TUBE",idtmed[10],dm,3);
360 gMC->Gspos("TPOV",1,"TPCO",0.,0.,0.,0,"ONLY");
369 gMC->Gsvolu("TPG1","TUBE",idtmed[8],dm,3);
370 gMC->Gspos("TPG1",1,"TPCO",0.,0.,251.,0,"ONLY");
371 gMC->Gspos("TPG1",2,"TPCO",0.,0.,-251.,0,"ONLY");
373 gMC->Gspos("TPCO",1,"TPC ",0.,0.,0.,0,"ONLY");
376 //----------------------------------------------------------
377 // Small wheel -> positioned in "side gas
378 //----------------------------------------------------------
384 gMC->Gsvolu("TPWS", "TUBE", idtmed[0], dm, 3);
390 gMC->Gsvolu("TPW1", "TUBE", idtmed[2], dm, 3);
392 gMC->Gspos("TPW1", 1, "TPWS", 0., 0., 0., 0, "ONLY");
394 z0 = 1.; // spoke wheel is shifted w.r.t. center of the "side gas"
396 gMC->Gspos("TPWS", 1, "TPSG", 0, 0, z0, 0, "ONLY");
405 gMC->Gsvolu("TPS1","TUBE",idtmed[0],dm,3);
409 gMC->Gsvolu("TPS2","TUBE",idtmed[24],dm,3);
411 gMC->Gspos("TPS2",1,"TPS1",0.,0.,0.,0,"ONLY");
415 gMC->Gspos("TPS1",1,"TPC ",0.,0.,z0,0,"ONLY");
416 gMC->Gspos("TPS1",2,"TPC ",0.,0.,-z0,0,"ONLY");
424 gMC->Gsvolu("TPG2","TUBE",idtmed[8],dm,3);
428 gMC->Gspos("TPG2",1,"TPC ",0.,0.,z0,0,"ONLY");
429 gMC->Gspos("TPG2",2,"TPC ",0.,0.,-z0,0,"ONLY");
432 //---------------------------------------------------------
433 // central wheel 6 (radial direction) x 4 (along z) cm2
434 //---------------------------------------------------------
440 gMC->Gsvolu("TPWC","TUBE",idtmed[0],dm,3);
446 gMC->Gsposp("TPWI",2,"TPWC",0.,0.,0.,0,"ONLY",dm,3);
448 z0 = z_side - 1.9 - 2.;
450 gMC->Gspos("TPWC",1,"TPSG",0.,0.,z0,0,"ONLY");
454 gMC->Gsvolu("TPSE","BOX ",idtmed[24],dm,0); // "empty" part of the spoke
457 //---------------------------------------------------------
458 // inner spokes (nSectorInner)
459 //---------------------------------------------------------
461 dm[0] = 0.5*(139.9-82.1);
465 Float_t x1 = dm[0]+82.;
467 gMC->Gsvolu("TPSI","BOX",idtmed[0],dm,3);
472 gMC->Gsposp("TPSE",1,"TPSI",0.,0.,0.,0,"ONLY",dm,3);
474 for(ns=0;ns<nInnerSector;ns++){
476 phi1 = 0.5*InnerOpenAngle + ns*InnerOpenAngle + InnerAngleShift;
480 phi1 = (Float_t)TMath::Nint(phi1);
483 if(phi2>360.) phi2 -= 360.;
488 alpha = phi1 * kDegrad;
489 x = x1 * TMath::Cos(alpha);
490 y = x1 * TMath::Sin(alpha);
492 AliMatrix(idrotm[nRotMat],theta1,phi1,theta2,phi2,theta3,phi3);
494 gMC->Gspos("TPSI",ns+1,"TPSG",x,y,z0,idrotm[nRotMat],"ONLY");
500 //-------------------------------------------------------------
501 // outer spokes (nSectorOuter)
502 //-------------------------------------------------------------
504 dm[0] = 0.5*(257.9-146.1);
510 gMC->Gsvolu("TPSO","BOX ",idtmed[0],dm,3);
515 gMC->Gsposp("TPSE",2,"TPSO",0.,0.,0.,0,"ONLY",dm,3);
517 for(ns=0;ns<nOuterSector;ns++){
519 phi1 = 0.5*OuterOpenAngle + ns*OuterOpenAngle + OuterAngleShift;
523 phi1 = (Float_t)TMath::Nint(phi1);
526 if(phi2>360.) phi2 -= 360.;
531 alpha = phi1 * kDegrad;
532 x = x1 * TMath::Cos(alpha);
533 y = x1 * TMath::Sin(alpha);
535 AliMatrix(idrotm[nRotMat],theta1,phi1,theta2,phi2,theta3,phi3);
537 gMC->Gspos("TPSO",ns+1,"TPSG",x,y,z0,idrotm[nRotMat],"ONLY");
545 // --------------------------------------------------------
546 // put the readout chambers into the TPC
547 // --------------------------------------------------------
556 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
560 gMC->Gspos("TPSG", 1, "TPC ", 0, 0, z0, 0, "ONLY");
561 gMC->Gspos("TPSG", 2, "TPC ", 0, 0, -z0, idrotm[nRotMat], "ONLY");
563 gMC->Gspos("TPC ", 1, "ALIC", 0, 0, 0, 0, "ONLY");
565 //----------------------------------------------------
566 // Inner vessel and HV degrader
567 //----------------------------------------------------
589 gMC->Gsvolu("TPVD", "PCON", idtmed[12], dm, 15); // CO2
606 gMC->Gsvolu("TIVC","PCON",idtmed[11],dm,9); // C-fibre
608 gMC->Gspos("TIVC",1,"TPVD",0.,0.,0.,0,"ONLY");
609 gMC->Gspos("TIVC",2,"TPVD",0.,0.,0.,idrotm[nRotMat],"ONLY");
617 gMC->Gsvolu("TIVB","TUBE",idtmed[9],dm,3);
619 gMC->Gspos("TIVB",1,"TPVD",0.,0.,0.,0,"ONLY");
621 gMC->Gspos("TPVD",1,"ALIC",0.,0.,0.,0,"ONLY");
627 // ---------------------------------------------------
629 // ---------------------------------------------------
630 gMC->Gsord("TPSG", 6);
635 //_____________________________________________________________________________
636 void AliTPCv0::CreateMaterials()
639 // Define materials for the TPC
641 AliTPC::CreateMaterials();
644 //_____________________________________________________________________________
645 void AliTPCv0::DrawDetector()
648 // Draw a shaded view of the Time Projection Chamber version 0
651 // Set everything unseen
652 gMC->Gsatt("*", "seen", -1);
654 // Set ALIC mother transparent
655 gMC->Gsatt("ALIC","SEEN",0);
657 // Set the volumes visible
658 gMC->Gsatt("TPC","SEEN",0);
659 gMC->Gsatt("TGAS","SEEN",0);
660 gMC->Gsatt("TPSG","SEEN",0);
661 gMC->Gsatt("TPHV","SEEN",1);
662 gMC->Gsatt("TPMH","SEEN",1);
663 gMC->Gsatt("TPEC","SEEN",0);
664 gMC->Gsatt("TRCS","SEEN",1);
665 gMC->Gsatt("TRCL","SEEN",1);
666 gMC->Gsatt("TPWL","SEEN",1);
667 gMC->Gsatt("TPWI","SEEN",1);
668 gMC->Gsatt("TPWS","SEEN",1);
669 gMC->Gsatt("TPW1","SEEN",1);
670 gMC->Gsatt("TPS1","SEEN",1);
671 gMC->Gsatt("TPS2","SEEN",1);
672 gMC->Gsatt("TPG1","SEEN",1);
673 gMC->Gsatt("TPG2","SEEN",1);
674 gMC->Gsatt("TPWC","SEEN",1);
675 gMC->Gsatt("TPSI","SEEN",1);
676 gMC->Gsatt("TPSO","SEEN",1);
677 gMC->Gsatt("TPCO","SEEN",1);
678 gMC->Gsatt("TPOV","SEEN",1);
679 gMC->Gsatt("TPVD","SEEN",1);
681 gMC->Gdopt("hide", "on");
682 gMC->Gdopt("shad", "on");
683 gMC->Gsatt("*", "fill", 7);
684 gMC->SetClipBox(".");
685 gMC->SetClipBox("*", 0, 1000, -1000, 1000, -1000, 1000);
687 gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
688 gMC->Gdhead(1111, "Time Projection Chamber");
689 gMC->Gdman(18, 4, "MAN");
690 gMC->Gdopt("hide","off");
693 //_____________________________________________________________________________
694 void AliTPCv0::Init()
697 // Initialise Time Projection Chamber version 0
699 printf("TPC version 0 initialized\n");
702 //_____________________________________________________________________________
703 void AliTPCv0::StepManager()
706 // Procedure called at each step in the TPC