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 1.34 2001/04/23 10:20:18 hristov
19 Constant casted to avoid ambiguity
21 Revision 1.33 2001/04/20 08:16:47 kowal2
22 Protection against too small betaGamma. Thanks to Ivana and Yves.
24 Revision 1.32 2001/03/13 13:07:34 kowal2
25 Corrected bug in the TPC mother volume geometry.
28 Revision 1.31 2000/11/30 11:48:50 kowal2
29 TLorentzVector.h adde to satisfy the latest changes by Federico
31 Revision 1.30 2000/11/14 10:48:57 kowal2
32 Correct material used for TSA4. Thanks to J. Barbosa.
34 Revision 1.29 2000/11/06 17:24:10 kowal2
35 Corrected bug in the outer containment vessel and
36 the outer field cage geometry.
39 Revision 1.28 2000/11/02 16:55:24 kowal2
40 Corrected bug in the inner containment vessel geometry.
43 Revision 1.27 2000/11/02 07:24:11 kowal2
44 Correction in the TPC geometry.
45 Changes due to the new hit structure.
47 Revision 1.26 2000/10/05 16:16:29 kowal2
48 Corrections of the hit recording algorithm.
50 Revision 1.25 2000/10/02 21:28:18 fca
51 Removal of useless dependecies via forward declarations
53 Revision 1.24 2000/08/28 10:02:30 kowal2
54 Corrected bug in the StepManager
56 Revision 1.23 2000/07/10 20:57:39 hristov
57 Update of TPC code and macros by M.Kowalski
59 Revision 1.22 2000/06/30 12:07:50 kowal2
60 Updated from the TPC-PreRelease branch
62 Revision 1.21.2.4 2000/06/26 07:39:42 kowal2
63 Changes to obey the coding rules
65 Revision 1.21.2.3 2000/06/25 08:38:41 kowal2
66 Splitted from AliTPCtracking
68 Revision 1.21.2.2 2000/06/16 12:58:13 kowal2
69 Changed parameter settings
71 Revision 1.21.2.1 2000/06/09 07:15:07 kowal2
73 Defaults loaded automatically (hard-wired)
74 Optional parameters can be set via macro called in the constructor
76 Revision 1.21 2000/05/15 10:00:30 kowal2
77 Corrected bug in the TPC geometry, thanks to Ivana Hrivnacova
79 Revision 1.20 2000/04/17 09:37:33 kowal2
80 removed obsolete AliTPCDigitsDisplay.C
82 Revision 1.19.8.2 2000/04/10 08:31:52 kowal2
84 Different geometry for different sectors
85 Updated readout chambers
86 Some modifications to StepManager by J.Belikov
88 Revision 1.19.8.1 2000/04/10 07:56:53 kowal2
89 Not used anymore - removed
91 Revision 1.19 1999/11/04 17:28:07 fca
92 Correct barrel part of HV Degrader
94 Revision 1.18 1999/10/14 16:52:08 fca
95 Only use PDG codes and not GEANT ones
97 Revision 1.17 1999/10/08 06:27:23 fca
98 Corrected bug in the HV degrader geometry, thanks to G.Tabary
100 Revision 1.16 1999/10/04 13:39:54 fca
101 Correct array index problem
103 Revision 1.15 1999/09/29 09:24:34 fca
104 Introduction of the Copyright and cvs Log
109 ///////////////////////////////////////////////////////////////////////////////
111 // Time Projection Chamber version 2 -- detailed TPC and slow simulation //
115 <img src="picts/AliTPCv2Class.gif">
120 ///////////////////////////////////////////////////////////////////////////////
125 #include "AliTPCv2.h"
126 #include "AliTPCDigitsArray.h"
129 #include "AliConst.h"
131 #include "AliTPCParam.h"
132 #include "AliTPCParamSR.h"
133 #include "AliTPCTrackHits.h"
134 #include "TLorentzVector.h"
139 //_____________________________________________________________________________
140 AliTPCv2::AliTPCv2(const char *name, const char *title) :
144 // Standard constructor for Time Projection Chamber version 2
150 SetBufferSize(128000);
152 SetGasMixt(2,20,10,-1,0.9,0.1,0.); // Ne-CO2 90-10
158 SetSecLows(1, 2, 3, 19, 20, 21);
159 SetSecUps(37, 38, 39, 37+18, 38+18, 39+18, -1, -1, -1, -1, -1, -1);
160 SetSens(1); // sensitive strips set
163 fTPCParam->Write(fTPCParam->GetTitle());
166 //_____________________________________________________________________________
167 void AliTPCv2::CreateGeometry()
170 // Create the geometry of Time Projection Chamber version 2
174 <img src="picts/AliTPC.gif">
179 <img src="picts/AliTPCv2Tree.gif">
184 Int_t *idtmed = fIdtmed->GetArray();
195 Int_t nInnerSector = fTPCParam->GetNInnerSector()/2;
196 Int_t nOuterSector = fTPCParam->GetNOuterSector()/2;
198 // ---------------------------------------------------
199 // sector specification check
200 // ---------------------------------------------------
204 for (i = 0; i < 6; ++i) {
205 if (fSecLows[i] >= 0 && fSecLows[i] < 2*nInnerSector) {
207 printf("*** SECTOR %d selected\n",fSecLows[i]);
212 printf("*** ALL LOWER SECTORS SELECTED ***\n");
217 printf("*** ERROR: AT LEAST ONE LOWER SECTOR MUST BE SPECIFIED ***\n");
218 printf("!!! PROGRAM STOPPED !!!\n");
224 for (i = 0; i < 12; ++i) {
225 if (fSecUps[i] > 2*nInnerSector-1 &&
226 fSecUps[i] < 2*(nInnerSector+nOuterSector)) {
227 printf("*** SECTOR %d selected\n",fSecUps[i]);
232 printf("*** ALL UPPER SECTORS SELECTED ***\n");
237 //--------------------------------------------------------------------
240 // Mother volume TPC (Air) - all volumes will be positioned in it
295 gMC->Gsvolu("TPC ","PCON",idtmed[0],dm,27);
299 //-------------------------------------------------------------------
300 // Tpc Outer INsulator (CO2) - contains cont. vessel and field cage
301 //-------------------------------------------------------------------
343 gMC->Gsvolu("TOIN","PCON",idtmed[3],dm,21);
345 //----------------------------------------------------------------
346 // Tpc Outer Contaiment Vessel
347 // mother volume - Al, daughters - composite (sandwich)
348 //----------------------------------------------------------------
390 gMC->Gsvolu("TOCV","PCON",idtmed[4],dm,21);
392 // Daughter volumes - sandwich
394 // Tpc SAndwich 1 - Al
400 gMC->Gsvolu("TSA1","TUBE",idtmed[4],dm,3);
402 // Tpc SAndwich 2 - epoxy glue (I use Lexan)
407 gMC->Gsvolu("TSA2","TUBE",idtmed[14],dm,3);
409 // Tpc SAndwich 3 - Tedlar
414 gMC->Gsvolu("TSA3","TUBE",idtmed[9],dm,3);
417 // Tpc SAndwich 4 - fiber glass (G10)
422 gMC->Gsvolu("TSA4","TUBE",idtmed[12],dm,3);
424 // Tpc SAndwich 5 - NOMEX honeycomb
429 gMC->Gsvolu("TSA5","TUBE",idtmed[6],dm,3);
431 // 5->4->3->2->1->TCOV
434 gMC->Gspos("TSA5",1,"TSA4",0.,0.,0.,0,"ONLY");
435 gMC->Gspos("TSA4",1,"TSA3",0.,0.,0.,0,"ONLY");
436 gMC->Gspos("TSA3",1,"TSA2",0.,0.,0.,0,"ONLY");
437 gMC->Gspos("TSA2",1,"TSA1",0.,0.,0.,0,"ONLY");
439 gMC->Gspos("TSA1",1,"TOCV",0.,0.,3.,0,"ONLY");
443 gMC->Gspos("TOCV",1,"TOIN",0.,0.,0.,0,"ONLY");
445 //-------------------------------------------------------
446 // Tpc Outer Field Cage
447 // mother volume - Al, daughters - composite (sandwich)
448 //-------------------------------------------------------
490 gMC->Gsvolu("TOFC","PCON",idtmed[4],dm,21);
494 // Tpc SAndwich 6 - Tedlar
500 gMC->Gsvolu("TSA6","TUBE",idtmed[9],dm,3);
502 // Tpc SAndwich 7 - fiber glass
507 gMC->Gsvolu("TSA7","TUBE",idtmed[12],dm,3);
510 // Tpc SAndwich 8 - NOMEX
515 gMC->Gsvolu("TSA8","TUBE",idtmed[6],dm,3);
519 gMC->Gspos("TSA8",1,"TSA7",0.,0.,0.,0,"ONLY");
520 gMC->Gspos("TSA7",1,"TSA6",0.,0.,0.,0,"ONLY");
521 gMC->Gspos("TSA6",1,"TOFC",0.,0.,0.,0,"ONLY");
525 gMC->Gspos("TOFC",1,"TOIN",0.,0.,0.,0,"ONLY");
529 gMC->Gspos("TOIN",1,"TPC ",0.,0.,0.,0,"ONLY");
533 //--------------------------------------------------------------------
534 // Tpc Inner INsulator (CO2) - inner f.c. will be placed there
535 // Inner containment vessel will be placed directly in the TPC
536 //--------------------------------------------------------------------
566 gMC->Gsvolu("TIIN","PCON",idtmed[3],dm,15);
568 // the middle part of the F.C. is thinner - carve out the strip - Ne-CO2
574 gMC->Gsvolu("TII1","TUBE",idtmed[1],dm,3);
576 gMC->Gspos("TII1",1,"TIIN",0.,0.,0.,0,"ONLY");
578 //-----------------------------------------------------
579 // Tpc Inner Field Cage
580 // mother volume - Al, daughters - composite (sandwich)
581 //------------------------------------------------------
647 gMC->Gsvolu("TIFC","PCON",idtmed[4],dm,33);
649 // daughter volumes - central part
651 // Tpc Sandwich 9 -Tedlar
657 gMC->Gsvolu("TSA9","TUBE",idtmed[9],dm,3);
659 // Tpc Sandwich 10 - fiber glass (G10)
664 gMC->Gsvolu("TS10","TUBE",idtmed[12],dm,3);
666 // Tpc Sandwich 11 - NOMEX
671 gMC->Gsvolu("TS11","TUBE",idtmed[6],dm,3);
675 gMC->Gspos("TS11",1,"TS10",0.,0.,0.,0,"ONLY");
676 gMC->Gspos("TS10",1,"TSA9",0.,0.,0.,0,"ONLY");
678 gMC->Gspos("TSA9",1,"TIFC",0.,0.,0.,0,"ONLY");
680 // daughter volumes - outer parts (reinforced)
682 // Tpc Sandwich 12 -Tedlar
688 gMC->Gsvolu("TS12","TUBE",idtmed[9],dm,3);
690 // Tpc Sandwich 13 - fiber glass (G10)
695 gMC->Gsvolu("TS13","TUBE",idtmed[12],dm,3);
697 // Tpc Sandwich 14 - NOMEX
702 gMC->Gsvolu("TS14","TUBE",idtmed[6],dm,3);
706 gMC->Gspos("TS14",1,"TS13",0.,0.,0.,0,"ONLY");
707 gMC->Gspos("TS13",1,"TS12",0.,0.,0.,0,"ONLY");
709 gMC->Gspos("TS12",1,"TIFC",0.,0.,170.05,0,"ONLY");
710 gMC->Gspos("TS12",2,"TIFC",0.,0.,-170.05,0,"ONLY");
712 // place this inside the inner insulator
714 gMC->Gspos("TIFC",1,"TIIN",0.,0.,0.,0,"ONLY");
716 // and now in the TPC...
718 gMC->Gspos("TIIN",1,"TPC ",0.,0.,0.,0,"ONLY");
720 //---------------------------------------------------------
721 // Tpc Inner Containment vessel - Cones
722 //---------------------------------------------------------
776 gMC->Gsvolu("TICC","PCON",idtmed[4],dm,27);
778 Float_t phi1,phi2,phi3,theta1,theta2,theta3; // rotation angles
789 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
791 gMC->Gspos("TICC",1,"TPC ",0.,0.,0.,0,"ONLY");
792 gMC->Gspos("TICC",2,"TPC ",0.,0.,0.,idrotm[nRotMat],"ONLY");
795 //---------------------------------------------------------
796 // Tpc Inner Containment vessel - Middle part -Al
797 //---------------------------------------------------------
839 gMC->Gsvolu("TICM","PCON",idtmed[4],dm,21);
841 // Tpc Sandwich 15 - Al
847 gMC->Gsvolu("TS15","TUBE",idtmed[4],dm,3);
849 // Tpc Sandwich 16 - epoxy glue
854 gMC->Gsvolu("TS16","TUBE",idtmed[14],dm,3);
856 // Tpc Sandwich 17 - Tedlar
861 gMC->Gsvolu("TS17","TUBE",idtmed[9],dm,3);
863 // Tpc Sandwich 18 - fiber glass
868 gMC->Gsvolu("TS18","TUBE",idtmed[12],dm,3);
870 // Tpc Sandwich 19 - Nomex
875 gMC->Gsvolu("TS19","TUBE",idtmed[12],dm,3);
877 // 19->18->17->16->15-> TICM
879 gMC->Gspos("TS19",1,"TS18",0.,0.,0.,0,"ONLY");
880 gMC->Gspos("TS18",1,"TS17",0.,0.,0.,0,"ONLY");
881 gMC->Gspos("TS17",1,"TS16",0.,0.,0.,0,"ONLY");
882 gMC->Gspos("TS16",1,"TS15",0.,0.,0.,0,"ONLY");
884 gMC->Gspos("TS15",1,"TICM ",0.,0.,0.,0,"ONLY");
887 // TPc inner cont. vessel Joints
893 gMC->Gsvolu("TPJ1","TUBE",idtmed[4],dm,3);
895 gMC->Gspos("TPJ1",1,"TPC ",0.,0.,72.3,0,"ONLY");
896 gMC->Gspos("TPJ1",2,"TPC ",0.,0.,-72.3,0,"ONLY");
928 gMC->Gsvolu("TPJ2","PCON",idtmed[4],dm,15);
930 gMC->Gspos("TPJ2",1,"TPC ",0.,0.,0.,0,"ONLY");
931 gMC->Gspos("TPJ2",2,"TPC ",0.,0.,0.,idrotm[nRotMat],"ONLY");
935 // Tpc Inner Containment vessel Seal (Viton, I use Lexan for a time being)
941 gMC->Gsvolu("TICS","TUBE",idtmed[14],dm,3);
943 gMC->Gspos("TICS",1,"TPC ",0.,0.,71.7,0,"ONLY");
944 gMC->Gspos("TICS",2,"TPC ",0.,0.,-71.7,0,"ONLY");
948 gMC->Gspos("TICM",1,"TPC ",0.,0.,0.,0,"ONLY");
952 nRotMat++; // prepare for the next rotation matrix
954 //---------------------------------------------------------
955 // Tpc Dift Gas volume Nonsensitive (Ne-CO2 90/10)
956 // and its daughters (HV membrane, rods, readout chambers)
957 //---------------------------------------------------------
963 gMC->Gsvolu("TDGN","TUBE",idtmed[1],dm,3);
965 // sector opening angles
967 Float_t innerOpenAngle = fTPCParam->GetInnerAngle();
968 Float_t outerOpenAngle = fTPCParam->GetOuterAngle();
970 // sector angle shift
972 Float_t innerAngleShift = fTPCParam->GetInnerAngleShift();
975 // All above parameters are identical for inner and outer
976 // sectors. The distinction is kept for the historical reasons
977 // and eventually will disappear.
979 Float_t tanAlpha = TMath::Tan(0.5*innerOpenAngle);
980 Float_t cosAlpha = TMath::Sqrt(1.+tanAlpha*tanAlpha);
983 //-------------------------------------------------------------------------
984 // Tpc Inner Readout Chambers
985 //-------------------------------------------------------------------------
989 dm[2]= 1.6; // thickness
992 gMC->Gsvolu("TIRC","TRD1",idtmed[4],dm,4);
994 // this volume will be positioned in the empty space
995 // of the end-cap to avoid overlaps
1002 gMC->Gsvolu("TIC1","TRD1",idtmed[4],dm,4);
1005 //------------------------------------------------
1006 // Tpc Inner readout chamber Pad Plane
1007 //------------------------------------------------
1014 gMC->Gsvolu("TIPP","TRD1",idtmed[12],dm,4);
1018 dm[0] -= 1.218511934;
1019 dm[1] -= 1.218511934;
1022 gMC->Gsvolu("TIC3","TRD1",idtmed[1],dm,4);
1024 gMC->Gspos("TIC3",1,"TIPP",0.,0.15,0.,0,"ONLY");
1026 gMC->Gspos("TIPP",1,"TIRC",0.,1.1,0.,0,"ONLY");
1029 //----------------------------------------------
1030 // Tpc Readout Chambers Empty spaces - for both
1031 // inner and outer sectors
1032 //----------------------------------------------
1034 gMC->Gsvolu("TRCE","TRD1",idtmed[0],dm,0);
1036 // Inner sector - 4 spaces
1047 space = rr*tanAlpha-dm[0];
1049 for(Int_t nsLow=0;nsLow<4;nsLow++){
1052 dm[1]= rr*tanAlpha - space;
1056 gMC->Gsposp("TRCE",nsLow+1,"TIRC",0.,-0.8,zz,0,"ONLY",dm,4);
1062 gMC->Gsposp("TRCE",nsLow+5,"TIC1",0.,1.05,zz-2.1,0,"ONLY",dm,4);
1065 dm[0] = rr*tanAlpha - space;
1071 // dm[1] - this is the dm[1] from the previous TRCE
1075 gMC->Gsposp("TRCE",9,"TIC1",0.,-1.2,0.,0,"ONLY",dm,4);
1078 // TPc Space for Connectors
1085 gMC->Gsvolu("TPSC","BOX ",idtmed[0],dm,3);
1093 gMC->Gsvolu("TPCC","BOX ",idtmed[13],dm,3);
1095 gMC->Gspos("TPCC",1,"TPSC",0.,0.15,0.,0,"ONLY");
1103 // inner part of the inner sector - 2 x 20 holes
1105 astep = 20.00096874/19.;
1107 alpha = 10.00048437-astep;
1119 for(ncon=0;ncon<20;ncon++){
1125 phi3 = (alpha>0) ? 0. : 180.;
1126 theta3 = TMath::Abs(alpha);
1128 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1132 gMC->Gspos("TPSC",ncon+1,"TIRC",x1,0.3,-12.7875,idrotm[nRotMat],"ONLY");
1133 gMC->Gspos("TPSC",ncon+21,"TIRC",x2,0.3,-2.8625,idrotm[nRotMat],"ONLY");
1144 // outer part of the inner sector - 2 x 25 holes
1146 astep = 20.00096874/24.;
1147 alpha = 10.00048437-astep;
1155 for(ncon=0;ncon<25;ncon++){
1161 phi3 = (alpha>0) ? 0. : 180.;
1162 theta3 = TMath::Abs(alpha);
1164 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1168 gMC->Gspos("TPSC",ncon+41,"TIRC",x1,0.3,7.0625,idrotm[nRotMat],"ONLY");
1169 gMC->Gspos("TPSC",ncon+66,"TIRC",x2,0.3,16.9875,idrotm[nRotMat],"ONLY");
1180 //--------------------------------------------------------------------------
1181 // TPC Outer Readout Chambers
1182 // this is NOT a final design
1183 //--------------------------------------------------------------------------
1187 dm[2]= 1.5; //thickness
1190 gMC->Gsvolu("TORC","TRD1",idtmed[4],dm,4);
1192 //------------------------------------------------
1193 // Tpc Outer readout chamber Pad Plane
1194 //------------------------------------------------
1198 gMC->Gsvolu("TOPP","TRD1",idtmed[12],dm,4);
1200 dm[0] -= 1.218511934;
1201 dm[1] -= 1.218511934;
1204 gMC->Gsvolu("TOC3","TRD1",idtmed[1],dm,4);
1206 gMC->Gspos("TOC3",1,"TOPP",0.,0.15,0.,0,"ONLY");
1208 gMC->Gspos("TOPP",1,"TORC",0.,1.0,0.,0,"ONLY");
1217 gMC->Gsposp("TRCE",10,"TORC",0.,-0.8,-2.15,0,"ONLY",dm,4);
1224 gMC->Gsvolu("TOC1","TRD1",idtmed[4],dm,4);
1231 gMC->Gsposp("TRCE",11,"TOC1",0.,0.,0.,0,"ONLY",dm,4);
1233 //-----------------------------------------------
1234 // Tpc Services Support Wheel
1235 //-----------------------------------------------
1250 gMC->Gsvolu("TSSW","PGON",idtmed[4],dm,10);
1252 // Tpc Services Wheel Cover
1257 gMC->Gsvolu("TSWC","PGON",idtmed[4],dm,10);
1259 // Tpc Service wheel Cover Empty space
1266 gMC->Gsvolu("TSCE","TRD1",idtmed[0],dm,4);
1268 // Tpc services Wheel Empty Spaces
1275 gMC->Gsvolu("TWES","TRD1",idtmed[0],dm,4);
1277 // Tpc Services Wheel Bars
1279 gMC->Gsvolu("TSWB","TRD1",idtmed[4],dm,0);
1289 gMC->Gsposp("TSWB",1,"TWES",0.,0.,-85.125,0,"ONLY",dm,4);
1294 gMC->Gsposp("TSWB",2,"TWES",0.,0.,85.125,0,"ONLY",dm,4);
1296 // TPc ELectronics - right now 30% X0 Si
1303 gMC->Gsvolu("TPEL","TRD1",idtmed[11],dm,4);
1304 gMC->Gspos("TPEL",1,"TWES",0.,0.,0.,0,"ONLY");
1306 //--------------------------------------------------------------------------
1308 //--------------------------------------------------------------------------
1310 // TPc Main Wheel - Al
1316 gMC->Gsvolu("TPMW","TUBE",idtmed[4],dm,3);
1318 //--------------------------------------------------------------------------
1319 // Tpc Empty Space for the Readout chambers
1320 //--------------------------------------------------------------------------
1324 Float_t dR = 0.5*(rUp-rLow);
1326 space= 1.5/cosAlpha; // wheel ribs are 3.0 cm wide
1328 dm[0]= rLow*tanAlpha-space;
1329 dm[1]= rUp*tanAlpha-space;
1333 gMC->Gsvolu("TESR","TRD1",idtmed[0],dm,4);
1337 gMC->Gspos("TIC1",1,"TESR",0.,0.75,-dR+23.97,0,"ONLY");
1341 gMC->Gspos("TOC1",1,"TESR",0.,0.75,dR-55.02,0,"ONLY");
1343 // Tpc Empty Space Bars - Al (daughters of TESR)
1347 gMC->Gsvolu("TESB","TRD1",idtmed[4],dm,0);
1351 dm[0]= rLow*tanAlpha-space;
1352 dm[1]= 88.7*tanAlpha-space;
1358 gMC->Gsposp("TESB",1,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1362 dm[0]= 131.65*tanAlpha-space;
1363 dm[1]= 136.5*tanAlpha-space;
1366 zBar = -dR +131.65+dm[3]-rLow;
1368 gMC->Gsposp("TESB",2,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1372 dm[0]= 240.4*tanAlpha-space;
1373 dm[1]= rUp*tanAlpha-space;
1378 gMC->Gsposp("TESB",3,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1380 //------------------------------------------------------
1381 // TPc Lower "S" Sectors
1382 //------------------------------------------------------
1385 Float_t inSecLowEdge = fTPCParam->GetInnerRadiusLow();
1386 Float_t inSecUpEdge = fTPCParam->GetInnerRadiusUp();
1388 dm[0] = inSecLowEdge*TMath::Tan(0.5*innerOpenAngle)-0.01;
1389 dm[1] = inSecUpEdge*TMath::Tan(0.5*innerOpenAngle)-0.01;
1390 dm[2] = 0.5*(250. - 5.e-3);
1391 dm[3] = 0.5*(inSecUpEdge-inSecLowEdge);
1393 gMC->Gsvolu("TPLS", "TRD1", idtmed[2], dm, 4); // sensitive
1396 //----------------------------------------------------------
1397 // TPc Upper Sectors
1398 //----------------------------------------------------------
1400 Float_t ouSecLowEdge = fTPCParam->GetOuterRadiusLow();
1401 Float_t ouSecUpEdge = fTPCParam->GetOuterRadiusUp();
1403 dm[0] = ouSecLowEdge*TMath::Tan(0.5*outerOpenAngle)-0.01;
1404 dm[1] = ouSecUpEdge*TMath::Tan(0.5*outerOpenAngle)-0.01;
1405 dm[2] = 0.5*(250. - 5.e-3);
1406 dm[3] = 0.5*(ouSecUpEdge-ouSecLowEdge);
1408 gMC->Gsvolu("TPUS", "TRD1", idtmed[2], dm, 4); // sensitive
1414 gMC->Gsvolu("TPSS","TRD1",idtmed[2],dm,0); // sensitive
1416 Int_t nofStrips,nstr;
1418 Float_t stripThick = 0.01; // 100 microns
1424 // if all lower sectors selected define only 1 strip
1426 nofStrips=((fSecAL <0)||(fSecAL>=0 && fSens<0)) ? 1 : fTPCParam->GetNRowLow();
1427 deadSpace = fTPCParam->GetInnerWireMount();
1429 dm[2] = 0.5*(250. - 5.e-3);
1430 dm[3] = 0.5 * stripThick;
1432 for(nstr=0;nstr<nofStrips;nstr++){
1434 r1 = fTPCParam->GetPadRowRadiiLow(nstr);
1435 r2 = r1 + stripThick;
1436 dm[0] = r1 * TMath::Tan(0.5*innerOpenAngle) - deadSpace;
1437 dm[1] = r2 * TMath::Tan(0.5*innerOpenAngle) - deadSpace;
1438 zs = -inSecLowEdge -0.5*(inSecUpEdge-inSecLowEdge);
1442 gMC->Gsposp("TPSS", nstr+1, "TPLS", 0., 0., zs, 0, "ONLY", dm, 4);
1447 // strips only if several upper sectors selected end fSens > 0
1449 if(fSecAU >=0 && fSens >0){
1451 Int_t nsSave = nofStrips;
1455 nofStrips = fTPCParam->GetNRowUp();
1456 deadSpace = fTPCParam->GetOuterWireMount();
1458 dm[2] = 0.5*(250. - 5.e-3);
1459 dm[3] = 0.5 * stripThick;
1462 for(nstr=0;nstr<nofStrips;nstr++){
1464 r1 = fTPCParam->GetPadRowRadiiUp(nstr);
1465 r2 = r1 + stripThick;
1466 dm[0] = r1 * TMath::Tan(0.5*outerOpenAngle) - deadSpace;
1467 dm[1] = r2 * TMath::Tan(0.5*outerOpenAngle) - deadSpace;
1468 zs = -ouSecLowEdge -0.5*(ouSecUpEdge-ouSecLowEdge);
1472 gMC->Gsposp("TPSS", nstr+1+nsSave, "TPUS", 0., 0., zs, 0, "ONLY", dm, 4);
1478 //-------------------------------------------------------
1479 // positioning of the empty spaces into the main wheel
1480 // and readout chambers and sectors into the drift gas
1481 //-------------------------------------------------------
1483 Float_t rCenter,xc,yc;
1484 Float_t rInner,rOuter; // center of the inner and outer chamber
1492 for(Int_t ns=0; ns<nInnerSector;ns++){
1494 phi1 = ns * innerOpenAngle + innerAngleShift;
1495 phi1 *= kRaddeg; // in degrees
1497 phi1 = (Float_t)TMath::Nint(phi1) + 270.;
1499 if (phi1 > 360.) phi1 -= 360.;
1504 phi3 = ns * innerOpenAngle + innerAngleShift;
1505 phi3 *= kRaddeg; // in degrees
1507 phi3 = (Float_t)TMath::Nint(phi3);
1509 if(phi3 > 360.) phi3 -= 360.;
1513 // "holes"->End plate
1515 xc = rCenter*TMath::Cos(phi3*kDegrad);
1516 yc = rCenter*TMath::Sin(phi3*kDegrad);
1518 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1520 gMC->Gspos("TESR",ns+1,"TPMW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1522 // TSCE->TSWC (services wheel volumes)
1524 xc = 166.142*TMath::Cos(phi3*kDegrad);
1525 yc = 166.142*TMath::Sin(phi3*kDegrad);
1527 gMC->Gspos("TSCE",ns+1,"TSWC",xc,yc,0.,idrotm[nRotMat],"ONLY");
1528 gMC->Gspos("TWES",ns+1,"TSSW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1531 // readout chambers->TDGN (drift gas)
1533 xc = rInner*TMath::Cos(phi3*kDegrad);
1534 yc = rInner*TMath::Sin(phi3*kDegrad);
1536 gMC->Gspos("TIRC",ns+1,"TDGN",xc,yc,252.,idrotm[nRotMat],"ONLY");
1538 // here lower sectors
1542 // all lower sectors are positioned
1544 gMC->Gspos("TPLS",ns+1,"TDGN",xc,yc,125.0025,idrotm[nRotMat],"ONLY");
1546 Gspos("TPLS",ns+nInnerSector+1,"TDGN",xc,yc,-125.0025,idrotm[nRotMat],"ONLY");
1550 // only selected sectors are positioned (up to 6 sectors)
1552 for(Int_t sel=0;sel<6;sel++){
1554 if(fSecLows[sel] == ns){
1555 gMC->Gspos("TPLS",ns+1,"TDGN",xc,yc,125.0025,idrotm[nRotMat],"ONLY");
1557 else if(fSecLows[sel] == ns+nInnerSector){
1559 Gspos("TPLS",ns+nInnerSector+1,"TDGN",xc,yc,-125.0025,idrotm[nRotMat],"ONLY");
1562 } // lower sectors finished
1565 xc = rOuter*TMath::Cos(phi3*kDegrad);
1566 yc = rOuter*TMath::Sin(phi3*kDegrad);
1568 gMC->Gspos("TORC",ns+1,"TDGN",xc,yc,252.1,idrotm[nRotMat],"ONLY");
1570 // here upper sectors
1574 // all upper sectors
1576 gMC->Gspos("TPUS",ns+1,"TDGN",xc,yc,125.0025,idrotm[nRotMat],"ONLY");
1578 Gspos("TPUS",ns+nOuterSector+1,"TDGN",xc,yc,-125.0025,idrotm[nRotMat],"ONLY");
1582 // only selected sectors (up to 12)
1584 for(Int_t sel=0;sel<12;sel++){
1585 if(fSecUps[sel] == ns+2*nInnerSector){
1586 gMC->Gspos("TPUS",ns+1,"TDGN",xc,yc,125.0025,idrotm[nRotMat],"ONLY");
1588 else if(fSecUps[sel] == ns+2*nInnerSector+nOuterSector){
1590 Gspos("TPUS",ns+nOuterSector+1,"TDGN",xc,yc,-125.0025,idrotm[nRotMat],"ONLY");
1593 } // upper sectors finished
1598 theta2 = 0.; // reflection
1600 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1602 xc = rInner*TMath::Cos(phi3*kDegrad);
1603 yc = rInner*TMath::Sin(phi3*kDegrad);
1605 gMC->Gspos("TIRC",ns+nInnerSector+1,"TDGN",xc,yc,-252.,idrotm[nRotMat],"ONLY");
1607 xc = rOuter*TMath::Cos(phi3*kDegrad);
1608 yc = rOuter*TMath::Sin(phi3*kDegrad);
1610 gMC->Gspos("TORC",ns+nOuterSector+1,"TDGN",xc,yc,-252.1,idrotm[nRotMat],"ONLY");
1617 gMC->Gspos("TPMW",1,"TPC ",0.,0.,256.6,0,"ONLY");
1618 gMC->Gspos("TPMW",2,"TPC ",0.,0.,-256.6,idrotm[0],"ONLY");
1620 //---------------------------------------------------------
1621 // Tpc High Voltage Membrane - 100 microns of mylar
1622 //---------------------------------------------------------
1628 gMC->Gsvolu("THVM","TUBE",idtmed[8],dm,3);
1630 gMC->Gspos("THVM",1,"TDGN",0.,0.,0.,0,"ONLY");
1632 // Tpc High Voltage membrane Holders
1634 gMC->Gsvolu("THVH","TUBE",idtmed[4],dm,0);
1644 gMC->Gsposp("THVH",1,"TDGN",0.,0.,0.,0,"ONLY",dm,3);
1652 gMC->Gsposp("THVH",2,"TDGN",0.,0.,0.,0,"ONLY",dm,3);
1654 //----------------------------------------------------------
1655 // TPc Support Rods - MAKROLON
1656 //----------------------------------------------------------
1661 gMC->Gsvolu("TPSR","TUBE",idtmed[7],dm,0); // inner and outer rods differ
1664 for(Int_t nrod=0;nrod<18;nrod++){
1665 Float_t angle=innerOpenAngle*(Float_t)nrod;
1667 xc=81.5*TMath::Cos(angle);
1668 yc=81.5*TMath::Sin(angle);
1672 gMC->Gsposp("TPSR",nrod+1,"TDGN",xc,yc,126.9,0,"ONLY",dm,3);
1673 gMC->Gsposp("TPSR",nrod+19,"TDGN",xc,yc,-126.9,0,"ONLY",dm,3);
1677 xc=254.25*TMath::Cos(angle);
1678 yc=254.25*TMath::Sin(angle);
1680 // rod number 54 contans the HV cable
1683 gMC->Gsposp("TPSR",nrod+37,"TDGN",xc,yc,127.,0,"ONLY",dm,3);
1684 gMC->Gsposp("TPSR",nrod+54,"TDGN",xc,yc,-127.,0,"ONLY",dm,3);
1689 //----------------------------------------------------------
1690 // Tpc High Voltage Rod - MAKROLON + Copper cable
1691 //----------------------------------------------------------
1693 // rod with cable (Left)
1699 gMC->Gsvolu("THVL","TUBE",idtmed[7],dm,3);
1707 gMC->Gsvolu("THVC","TUBE",idtmed[10],dm,3);
1715 gMC->Gsvolu("THVE","TUBE",idtmed[1],dm,3);
1717 gMC->Gspos("THVC",1,"THVL",0.,0.,0.,0,"ONLY");
1718 gMC->Gspos("THVE",1,"THVL",0.,0.,0.,0,"ONLY");
1720 // rod without cable
1726 gMC->Gsvolu("THVR","TUBE",idtmed[7],dm,3);
1728 gMC->Gspos("THVL",1,"TDGN",xc,yc,-127.,0,"ONLY");
1729 gMC->Gspos("THVR",1,"TDGN",xc,yc,127.,0,"ONLY");
1731 gMC->Gspos("TDGN",1,"TPC ",0.,0.,0.,0,"ONLY");
1733 // services wheel cover -> wheel
1736 gMC->Gspos("TSWC",1,"TSSW",0.,0.,4.5,0,"ONLY");
1737 gMC->Gspos("TSWC",2,"TSSW",0.,0.,-4.5,0,"ONLY");
1740 // put the wheel into the TPC
1742 gMC->Gspos("TSSW",1,"TPC ",0.,0.,278.7,0,"ONLY");
1743 gMC->Gspos("TSSW",2,"TPC ",0.,0.,-278.7,0,"ONLY");
1747 gMC->Gsord("TPMW",6);
1748 gMC->Gsord("TSSW",6);
1749 gMC->Gsord("TSWC",6);
1750 if(fSecAL >=0) gMC->Gsord("TPLS",3);
1751 if(fSecAU >=0 && fSens >0) gMC->Gsord("TPUS",3);
1752 gMC->Gsord("TDGN",6);
1754 // put the TPC into ALIC (main mother volume)
1756 gMC->Gspos("TPC ",1,"ALIC",0.,0.,0.,0,"ONLY");
1760 } // end of function
1762 //_____________________________________________________________________________
1763 void AliTPCv2::DrawDetector()
1766 // Draw a shaded view of the Time Projection Chamber version 1
1769 // Set everything unseen
1770 gMC->Gsatt("*", "seen", -1);
1772 // Set ALIC mother transparent
1773 gMC->Gsatt("ALIC","SEEN",0);
1775 // Set the volumes visible
1778 gMC->Gsatt("TPC ","SEEN",0);
1779 gMC->Gsatt("TOIN","SEEN",1);
1780 gMC->Gsatt("TOIN","COLO",7);
1781 gMC->Gsatt("TOCV","SEEN",1);
1782 gMC->Gsatt("TOCV","COLO",4);
1783 gMC->Gsatt("TSA1","SEEN",0);
1784 gMC->Gsatt("TSA2","SEEN",0);
1785 gMC->Gsatt("TSA3","SEEN",0);
1786 gMC->Gsatt("TSA4","SEEN",0);
1787 gMC->Gsatt("TSA5","SEEN",0);
1788 gMC->Gsatt("TOFC","SEEN",1);
1789 gMC->Gsatt("TOFC","COLO",4);
1790 gMC->Gsatt("TSA6","SEEN",0);
1791 gMC->Gsatt("TSA7","SEEN",0);
1792 gMC->Gsatt("TSA8","SEEN",0);
1793 gMC->Gsatt("TIIN","SEEN",1);
1794 gMC->Gsatt("TIIN","COLO",7);
1795 gMC->Gsatt("TII1","SEEN",0);
1796 gMC->Gsatt("TIFC","SEEN",1);
1797 gMC->Gsatt("TIFC","COLO",4);
1798 gMC->Gsatt("TSA9","SEEN",0);
1799 gMC->Gsatt("TS10","SEEN",0);
1800 gMC->Gsatt("TS11","SEEN",0);
1801 gMC->Gsatt("TS12","SEEN",0);
1802 gMC->Gsatt("TS13","SEEN",0);
1803 gMC->Gsatt("TS14","SEEN",0);
1804 gMC->Gsatt("TICC","SEEN",0);
1805 gMC->Gsatt("TICM","SEEN",0);
1806 gMC->Gsatt("TS15","SEEN",0);
1807 gMC->Gsatt("TS16","SEEN",0);
1808 gMC->Gsatt("TS17","SEEN",0);
1809 gMC->Gsatt("TS18","SEEN",0);
1810 gMC->Gsatt("TS19","SEEN",0);
1811 gMC->Gsatt("TPJ1","SEEN",0);
1812 gMC->Gsatt("TPJ2","SEEN",0);
1813 gMC->Gsatt("TICS","SEEN",0);
1814 gMC->Gsatt("TDGN","SEEN",0);
1815 gMC->Gsatt("TIRC","SEEN",0);
1816 gMC->Gsatt("TIC1","SEEN",1);
1817 gMC->Gsatt("TIPP","SEEN",0);
1818 gMC->Gsatt("TIC3","SEEN",0);
1819 gMC->Gsatt("TRCE","SEEN",0);
1820 gMC->Gsatt("TPSC","SEEN",0);
1821 gMC->Gsatt("TPCC","SEEN",0);
1822 gMC->Gsatt("TORC","SEEN",0);
1823 gMC->Gsatt("TOPP","SEEN",0);
1824 gMC->Gsatt("TOC3","SEEN",0);
1825 gMC->Gsatt("TOC1","SEEN",1);
1826 gMC->Gsatt("TSSW","SEEN",1);
1827 gMC->Gsatt("TSWC","SEEN",1);
1828 gMC->Gsatt("TSSW","COLO",3);
1829 gMC->Gsatt("TSWC","COLO",3);
1830 gMC->Gsatt("TSCE","COLO",6);
1831 gMC->Gsatt("TSCE","SEEN",1);
1832 gMC->Gsatt("TWES","SEEN",0);
1833 gMC->Gsatt("TSWB","SEEN",0);
1834 gMC->Gsatt("TPEL","SEEN",0);
1835 gMC->Gsatt("TPMW","SEEN",1);
1836 gMC->Gsatt("TESR","SEEN",1);
1837 gMC->Gsatt("TPMW","COLO",12);
1838 gMC->Gsatt("TIC1","COLO",5);
1839 gMC->Gsatt("TOC1","COLO",5);
1840 gMC->Gsatt("TESB","SEEN",0);
1841 gMC->Gsatt("THVM","SEEN",1);
1842 gMC->Gsatt("THVM","COLO",11);
1843 gMC->Gsatt("THVH","SEEN",0);
1844 gMC->Gsatt("TPSR","SEEN",0);
1845 gMC->Gsatt("THVL","SEEN",0);
1846 gMC->Gsatt("THVC","SEEN",0);
1847 gMC->Gsatt("THVE","SEEN",0);
1848 gMC->Gsatt("THVR","SEEN",0);
1849 gMC->Gsatt("TPSS","SEEN",0);
1850 gMC->Gsatt("TPUS","SEEN",0);
1851 gMC->Gsatt("TPLS","SEEN",0);
1854 gMC->Gdopt("hide", "on");
1855 gMC->Gdopt("shad", "on");
1856 gMC->Gsatt("*", "fill", 7);
1857 gMC->SetClipBox(".");
1858 gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1859 gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1860 gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1861 gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1862 gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1863 gMC->DefaultRange();
1864 gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1865 gMC->Gdhead(1111, "Time Projection Chamber");
1866 gMC->Gdman(18, 4, "MAN");
1867 gMC->Gdopt("hide","off");
1870 //_____________________________________________________________________________
1871 void AliTPCv2::CreateMaterials()
1874 // Define materials for version 2 of the Time Projection Chamber
1877 AliTPC::CreateMaterials();
1880 //_____________________________________________________________________________
1881 void AliTPCv2::Init()
1884 // Initialises version 2 of the TPC after that it has been built
1887 Int_t *idtmed = fIdtmed->GetArray();
1893 fIdSens=gMC->VolId("TPSS");
1895 fIdLSec=gMC->VolId("TPLS"); // lower sector
1896 fIdUSec=gMC->VolId("TPUS"); // upper sector
1898 gMC->SetMaxNStep(30000); // max. number of steps increased
1900 gMC->Gstpar(idtmed[2],"LOSS",5); // specific energy loss
1902 printf("*** TPC version 2 initialized ***\n");
1903 printf("Maximum number of steps = %d\n",gMC->GetMaxNStep());
1909 //_____________________________________________________________________________
1910 void AliTPCv2::StepManager()
1913 // Called for every step in the Time Projection Chamber
1917 // parameters used for the energy loss calculations
1919 const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1920 const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1921 const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
1924 const Float_t kbig = 1.e10;
1931 vol[1]=0; // preset row number to 0
1935 gMC->SetMaxStep(kbig);
1937 if(!gMC->IsTrackAlive()) return; // particle has disappeared
1939 Float_t charge = gMC->TrackCharge();
1941 if(TMath::Abs(charge)<=0.) return; // take only charged particles
1943 // check the sensitive volume
1945 id = gMC->CurrentVolID(copy); // current volume Id
1948 vol[0] = copy-1; // lower sector number
1950 else if(id == fIdUSec){
1951 vol[0] = copy+fTPCParam->GetNInnerSector()-1; // upper sector number
1953 else if(id == fIdSens && gMC->IsTrackEntering()){
1955 // track is entering the sensitive strip
1957 vol[1]= copy-1; // row number (absolute)
1961 id = gMC->CurrentVolOffID(1,copy);
1967 vol[0] = copy-1; // sector number
1974 vol[0] = copy-1+fTPCParam->GetNInnerSector(); // sector number
1975 vol[1] -= fTPCParam->GetNRowLow(); // row number (starts also from 0)
1981 // because Jouri wants to have this
1983 gMC->TrackMomentum(p);
1987 hits[3]=0.; // this hit has no energy loss
1988 // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
1990 AddHit(gAlice->CurrentTrack(), vol,hits); //MI change
1994 gMC->TrackPosition(p);
1998 hits[3]=0.; // this hit has no energy loss
1999 // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2001 AddHit(gAlice->CurrentTrack(), vol,hits); //MI change
2006 //-----------------------------------------------------------------
2007 // charged particle is in the sensitive volume
2008 //-----------------------------------------------------------------
2010 if(gMC->TrackStep() > 0) {
2012 Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
2013 nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
2015 gMC->TrackPosition(p);
2019 hits[3]=(Float_t)nel;
2023 // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2025 gMC->TrackMomentum(p);
2026 Float_t momentum = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
2027 Float_t precision = (momentum>0.1) ? 0.002 :0.01;
2028 fTrackHits->SetHitPrecision(precision);
2030 AddHit(gAlice->CurrentTrack(), vol,hits); //MI change
2034 // Stemax calculation for the next step
2038 gMC->TrackMomentum(mom);
2039 Float_t ptot=mom.Rho();
2040 Float_t betaGamma = ptot/gMC->TrackMass();
2042 Int_t pid=gMC->TrackPid();
2043 if((pid==kElectron || pid==kPositron) && ptot > 0.002)
2045 pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
2050 betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3); // protection against too small bg
2051 pp=kprim*BetheBloch(betaGamma);
2053 if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
2057 gMC->Rndm(random,1); // good, old GRNDM from Geant3
2059 Double_t rnd = (Double_t)random[0];
2061 gMC->SetMaxStep(-TMath::Log(rnd)/pp);
2065 //_____________________________________________________________________________
2066 Float_t AliTPCv2::BetheBloch(Float_t bg)
2069 // Bethe-Bloch energy loss formula
2071 const Double_t kp1=0.76176e-1;
2072 const Double_t kp2=10.632;
2073 const Double_t kp3=0.13279e-4;
2074 const Double_t kp4=1.8631;
2075 const Double_t kp5=1.9479;
2077 Double_t dbg = (Double_t) bg;
2079 Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
2081 Double_t aa = TMath::Power(beta,kp4);
2082 Double_t bb = TMath::Power(1./dbg,kp5);
2084 bb=TMath::Log(kp3+bb);
2086 return ((Float_t)((kp2-aa-bb)*kp1/aa));