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 1.23 2000/07/10 20:57:39 hristov
19 Update of TPC code and macros by M.Kowalski
21 Revision 1.22 2000/06/30 12:07:50 kowal2
22 Updated from the TPC-PreRelease branch
24 Revision 1.21.2.4 2000/06/26 07:39:42 kowal2
25 Changes to obey the coding rules
27 Revision 1.21.2.3 2000/06/25 08:38:41 kowal2
28 Splitted from AliTPCtracking
30 Revision 1.21.2.2 2000/06/16 12:58:13 kowal2
31 Changed parameter settings
33 Revision 1.21.2.1 2000/06/09 07:15:07 kowal2
35 Defaults loaded automatically (hard-wired)
36 Optional parameters can be set via macro called in the constructor
38 Revision 1.21 2000/05/15 10:00:30 kowal2
39 Corrected bug in the TPC geometry, thanks to Ivana Hrivnacova
41 Revision 1.20 2000/04/17 09:37:33 kowal2
42 removed obsolete AliTPCDigitsDisplay.C
44 Revision 1.19.8.2 2000/04/10 08:31:52 kowal2
46 Different geometry for different sectors
47 Updated readout chambers
48 Some modifications to StepManager by J.Belikov
50 Revision 1.19.8.1 2000/04/10 07:56:53 kowal2
51 Not used anymore - removed
53 Revision 1.19 1999/11/04 17:28:07 fca
54 Correct barrel part of HV Degrader
56 Revision 1.18 1999/10/14 16:52:08 fca
57 Only use PDG codes and not GEANT ones
59 Revision 1.17 1999/10/08 06:27:23 fca
60 Corrected bug in the HV degrader geometry, thanks to G.Tabary
62 Revision 1.16 1999/10/04 13:39:54 fca
63 Correct array index problem
65 Revision 1.15 1999/09/29 09:24:34 fca
66 Introduction of the Copyright and cvs Log
71 ///////////////////////////////////////////////////////////////////////////////
73 // Time Projection Chamber version 2 -- detailed TPC and slow simulation //
77 <img src="picts/AliTPCv2Class.gif">
82 ///////////////////////////////////////////////////////////////////////////////
88 #include "AliTPCDigitsArray.h"
92 #include "AliTPCParam.h"
93 #include "AliTPCParamSR.h"
97 //_____________________________________________________________________________
98 AliTPCv2::AliTPCv2(const char *name, const char *title) :
102 // Standard constructor for Time Projection Chamber version 2
108 SetBufferSize(128000);
110 SetGasMixt(2,20,10,-1,0.9,0.1,0.); // Ne-CO2 90-10
116 SetSecLows(1, 2, 3, 19, 20, 21);
117 SetSecUps(37, 38, 39, 37+18, 38+18, 39+18, -1, -1, -1, -1, -1, -1);
118 SetSens(1); // sensitive strips set
121 fTPCParam->Write(fTPCParam->GetTitle());
124 //_____________________________________________________________________________
125 void AliTPCv2::CreateGeometry()
128 // Create the geometry of Time Projection Chamber version 2
132 <img src="picts/AliTPC.gif">
137 <img src="picts/AliTPCv2Tree.gif">
142 Int_t *idtmed = fIdtmed->GetArray();
153 Int_t nInnerSector = fTPCParam->GetNInnerSector()/2;
154 Int_t nOuterSector = fTPCParam->GetNOuterSector()/2;
156 // ---------------------------------------------------
157 // sector specification check
158 // ---------------------------------------------------
162 for (i = 0; i < 6; ++i) {
163 if (fSecLows[i] >= 0 && fSecLows[i] < 2*nInnerSector) {
165 printf("*** SECTOR %d selected\n",fSecLows[i]);
170 printf("*** ALL LOWER SECTORS SELECTED ***\n");
177 for (i = 0; i < 12; ++i) {
178 if (fSecUps[i] > 2*nInnerSector-1 &&
179 fSecUps[i] < 2*(nInnerSector+nOuterSector)) {
181 printf("*** SECTOR %d selected\n",fSecUps[i]);
186 printf("*** ALL UPPER SECTORS SELECTED ***\n");
190 if (ifl1 == 0 && ifl2 == 0) {
191 printf("*** ERROR: AT LEAST ONE SECTOR MUST BE SPECIFIED ***\n");
192 printf("!!! PROGRAM STOPPED !!!\n");
196 if ((fSecAL < 0 || fSecAU < 0) && fSens >= 0) {
197 printf("** ERROR: STRIPS CANNOT BE SPECIFIED FOR ALL SECTORS **\n");
198 printf("!!! PROGRAM STOPPED !!!\n");
202 //--------------------------------------------------------------------
205 // Mother volume (Air) - all volumes will be positioned in it
285 gMC->Gsvolu("TPC ","PCON",idtmed[0],dm,39);
288 //-------------------------------------------------------------------
289 // Tpc Outer INsulator (CO2)
290 //-------------------------------------------------------------------
329 gMC->Gsvolu("TOIN","PCON",idtmed[3],dm,21);
331 //---------------------------------------------------------------
332 // shreds (G10) - TPC Rings
333 //---------------------------------------------------------------
335 gMC->Gsvolu("TPCR","TUBE",idtmed[12],dm,0);
341 gMC->Gsposp("TPCR",1,"TOIN",0.,0.,-253.3,0,"ONLY",dm,3); // left bottom
349 gMC->Gsposp("TPCR",2,"TOIN",0.,0.,253.3,0,"ONLY",dm,3); // right
357 gMC->Gsposp("TPCR",3,"TOIN",0.,0.,-250.7,0,"ONLY",dm,3); // left top
359 //----------------------------------------------------------------
360 // Tpc Outer Contaiment Vessel
361 // mother volume - Al, daughters - composite (sandwich)
362 //----------------------------------------------------------------
398 gMC->Gsvolu("TOCV","PCON",idtmed[4],dm,18);
402 // Tpc SAndwich 1 - Al
408 gMC->Gsvolu("TSA1","TUBE",idtmed[4],dm,3);
410 // Tpc SAndwich 2 - Tedlar
415 gMC->Gsvolu("TSA2","TUBE",idtmed[9],dm,3);
417 // Tpc SAndwich 3 - Kevlar
422 gMC->Gsvolu("TSA3","TUBE",idtmed[5],dm,3);
424 // Tpc SAndwich 4 - NOMEX honeycomb
429 gMC->Gsvolu("TSA4","TUBE",idtmed[5],dm,3);
433 gMC->Gspos("TSA4",1,"TSA3",0.,0.,0.,0,"ONLY");
434 gMC->Gspos("TSA3",1,"TSA2",0.,0.,0.,0,"ONLY");
435 gMC->Gspos("TSA2",1,"TSA1",0.,0.,0.,0,"ONLY");
437 gMC->Gspos("TSA1",1,"TOCV",0.,0.,2.6,0,"ONLY");
441 gMC->Gspos("TOCV",1,"TOIN",0.,0.,0.,0,"ONLY");
443 //-------------------------------------------------------
444 // Tpc Outer Field Cage
445 // mother volume - Al, daughters - composite (sandwich)
446 //-------------------------------------------------------
486 gMC->Gsvolu("TOFC","PCON",idtmed[4],dm,21);
490 // Tpc SAndwich 5 - Al
496 gMC->Gsvolu("TSA5","TUBE",idtmed[4],dm,3);
498 // Tpc SAndwich 6 - Tedlar
503 gMC->Gsvolu("TSA6","TUBE",idtmed[9],dm,3);
505 // Tpc SAndwich 7 - Kevlar
510 gMC->Gsvolu("TSA7","TUBE",idtmed[5],dm,3);
512 // Tpc SAndwich 8 - NOMEX
517 gMC->Gsvolu("TSA8","TUBE",idtmed[6],dm,3);
521 gMC->Gspos("TSA8",1,"TSA7",0.,0.,0.,0,"ONLY");
522 gMC->Gspos("TSA7",1,"TSA6",0.,0.,0.,0,"ONLY");
523 gMC->Gspos("TSA6",1,"TSA5",0.,0.,0.,0,"ONLY");
525 gMC->Gspos("TSA5",1,"TOFC",0.,0.,0.,0,"ONLY");
529 gMC->Gspos("TOFC",1,"TOIN",0.,0.,0.,0,"ONLY");
533 gMC->Gspos("TOIN",1,"TPC ",0.,0.,0.,0,"ONLY");
535 //--------------------------------------------------------------------
536 // Tpc Inner INsulator (CO2)
537 //--------------------------------------------------------------------
552 Float_t tanL = (66.2-59.0)/(255.6-73.3); // tangent of the left cone part
555 dm[7]= 59.0+ (253.6-73.3)*tanL;
636 gMC->Gsvolu("TIIN","PCON",idtmed[3],dm,48);
639 //--------------------------------------------------------------------
640 // Tpc Inner Containment vessel, Left part
641 // mother volume - Al, daughter - composite (sandwich)
642 //--------------------------------------------------------------------
656 Float_t cosL = 1./TMath::Sqrt(1.+tanL*tanL);
657 Float_t sandThick = 2.14; // cone composite thickness
663 dm[7]= 59.0 + (253.6-73.3)*tanL;
670 dm[11]= dm[7]+sandThick/cosL;
675 dm[13]= 59.0+(75.6-73.3)*tanL;
676 dm[14]= dm[13]+sandThick/cosL;
702 gMC->Gsvolu("TICL","PCON",idtmed[4],dm,27);
706 // Tpc SAndwich 9 - Al
715 dm[4]= 59.0+(254.3-73.3)*tanL;
716 dm[5]= dm[4]+sandThick/cosL;
721 dm[7]= 59.0+(78.3-73.3)*tanL;
722 dm[8]= dm[7]+sandThick/cosL;
726 gMC->Gsvolu("TSA9","PCON",idtmed[4],dm,9);
728 // Tpc SAndwich 10 - Tedlar
738 gMC->Gsvolu("TS10","PCON",idtmed[9],dm,9);
740 // Tpc SAndwich 11 - Kevlar
750 gMC->Gsvolu("TS11","PCON",idtmed[5],dm,9);
752 // Tpc SAndwich 12 - NOMEX
762 gMC->Gsvolu("TS12","PCON",idtmed[6],dm,9);
766 gMC->Gspos("TS12",1,"TS11",0.,0.,0.,0,"ONLY");
767 gMC->Gspos("TS11",1,"TS10",0.,0.,0.,0,"ONLY");
768 gMC->Gspos("TS10",1,"TSA9",0.,0.,0.,0,"ONLY");
772 gMC->Gspos("TSA9",1,"TICL",0.,0.,0.,0,"ONLY");
774 //--------------------------------------------------------------------
775 // Tpc Inner Containment vessel, Right part
776 // mother volume - Al, daughter - composite (sandwich)
777 //--------------------------------------------------------------------
803 Float_t tanR = (66.0-59.0)/(250.5-73.3); // to avoid accuracy problems
804 Float_t cosR = 1./TMath::Sqrt(1.+tanR*tanR); //as above
809 dm[13]= 59.0+(75.6-73.3)*tanR;
816 dm[17]= dm[16]+sandThick/cosR;
821 dm[19]= 59.0+(248.4-73.3)*tanR;
822 dm[20]= dm[19]+sandThick/cosR;
836 gMC->Gsvolu("TICR","PCON",idtmed[4],dm,27);
842 // Tpc SAndwich 13 - Al
851 dm[4]= 59.0+(78.3-73.3)*tanR;
852 dm[5]= dm[4]+sandThick/cosR;
857 dm[7]= 59.0+(249.1-73.3)*tanR;
858 dm[8]= dm[7]+sandThick/cosR;
862 gMC->Gsvolu("TS13","PCON",idtmed[4],dm,9);
864 // Tpc SAndwich 14 - Tedlar
874 gMC->Gsvolu("TS14","PCON",idtmed[9],dm,9);
876 // Tpc SAndwich 15 - Kevlar
886 gMC->Gsvolu("TS15","PCON",idtmed[5],dm,9);
888 // Tpc SAndwich 16 - NOMEX
898 gMC->Gsvolu("TS16","PCON",idtmed[6],dm,9);
902 gMC->Gspos("TS16",1,"TS15",0.,0.,0.,0,"ONLY");
903 gMC->Gspos("TS15",1,"TS14",0.,0.,0.,0,"ONLY");
904 gMC->Gspos("TS14",1,"TS13",0.,0.,0.,0,"ONLY");
908 gMC->Gspos("TS13",1,"TICR",0.,0.,0.,0,"ONLY");
910 //------------------------------------------------------
911 // Tpc Inner Field Cage
912 // mother volume - Al, daughters - composite (sandwich)
913 //------------------------------------------------------
955 gMC->Gsvolu("TIFC","PCON",idtmed[4],dm,21);
959 // Tpc Sandwich 17 - Al
965 gMC->Gsvolu("TS17","TUBE",idtmed[4],dm,3);
967 // Tpc Sandwich 18 - Tedlar
972 gMC->Gsvolu("TS18","TUBE",idtmed[9],dm,3);
974 // Tpc Sandwich 19 - Kevlar
979 gMC->Gsvolu("TS19","TUBE",idtmed[5],dm,3);
981 // Tpc Sandwich 20 - NOMEX
986 gMC->Gsvolu("TS20","TUBE",idtmed[6],dm,3);
990 gMC->Gspos("TS20",1,"TS19",0.,0.,0.,0,"ONLY");
991 gMC->Gspos("TS19",1,"TS18",0.,0.,0.,0,"ONLY");
992 gMC->Gspos("TS18",1,"TS17",0.,0.,0.,0,"ONLY");
996 gMC->Gspos("TS17",1,"TIFC",0.,0.,0.,0,"ONLY");
1004 gMC->Gsposp("TPCR",4,"TIIN",0.,0.,-253.3,0,"ONLY",dm,3);
1009 gMC->Gsposp("TPCR",5,"TIIN",0.,0.,250.7,0,"ONLY",dm,3);
1014 gMC->Gsposp("TPCR",6,"TIIN",0.,0.,253.3,0,"ONLY",dm,3);
1018 gMC->Gspos("TICL",1,"TIIN",0.,0.,0.,0,"ONLY");
1022 gMC->Gspos("TICR",1,"TIIN",0.,0.,0.,0,"ONLY");
1026 gMC->Gspos("TIFC",1,"TIIN",0.,0.,0.,0,"ONLY");
1028 // Tpc Sandwich 21 - Al (central barrel)
1034 gMC->Gsvolu("TS21","TUBE",idtmed[4],dm,3);
1036 // Tpc Sandwich 22 - Tedlar (central barrel)
1041 gMC->Gsvolu("TS22","TUBE",idtmed[9],dm,3);
1043 // Tpc Sandwich 23 - Kevlar (central barrel)
1048 gMC->Gsvolu("TS23","TUBE",idtmed[5],dm,3);
1050 // Tpc Sandwich 24 - NOMEX (central barrel)
1055 gMC->Gsvolu("TS24","TUBE",idtmed[6],dm,3);
1059 gMC->Gspos("TS24",1,"TS23",0.,0.,0.,0,"ONLY");
1060 gMC->Gspos("TS23",1,"TS22",0.,0.,0.,0,"ONLY");
1061 gMC->Gspos("TS22",1,"TS21",0.,0.,0.,0,"ONLY");
1063 gMC->Gspos("TS21",1,"TIIN",0.,0.,0.,0,"ONLY");
1065 // put everything into the TPC
1067 gMC->Gspos("TIIN",1,"TPC ",0.,0.,0.,0,"ONLY");
1070 //---------------------------------------------------------
1071 // Tpc Dift Gas volume Nonsensitive (Ne-CO2 90/10)
1072 // and its daughters (HV membrane, rods, readout chambers)
1073 //---------------------------------------------------------
1079 gMC->Gsvolu("TDGN","TUBE",idtmed[1],dm,3); // nonsensitive
1081 // sector opening angles
1083 Float_t innerOpenAngle = fTPCParam->GetInnerAngle();
1084 Float_t outerOpenAngle = fTPCParam->GetOuterAngle();
1086 // sector angle shift
1088 Float_t innerAngleShift = fTPCParam->GetInnerAngleShift();
1090 // All above parameters are identical for inner and outer
1091 // sectors. The distinction is kept for the historical reasons
1092 // and eventually will disappear.
1094 Float_t tanAlpha = TMath::Tan(0.5*innerOpenAngle);
1095 Float_t cosAlpha = TMath::Sqrt(1.+tanAlpha*tanAlpha);
1098 //-------------------------------------------------------------------------
1099 // Tpc Inner Readout Chambers
1100 //-------------------------------------------------------------------------
1104 dm[2]= 1.6; // thickness
1107 gMC->Gsvolu("TIRC","TRD1",idtmed[4],dm,4);
1109 // this volume will be positioned in the empty space
1110 // of the end-cap to avoid overlaps
1117 gMC->Gsvolu("TIC1","TRD1",idtmed[4],dm,4);
1119 //------------------------------------------------
1120 // Tpc Inner readout chamber Pad Plane
1121 //------------------------------------------------
1128 gMC->Gsvolu("TIPP","TRD1",idtmed[12],dm,4);
1132 dm[0] -= 1.218511934;
1133 dm[1] -= 1.218511934;
1136 gMC->Gsvolu("TIC3","TRD1",idtmed[1],dm,4);
1138 gMC->Gspos("TIC3",1,"TIPP",0.,0.15,0.,0,"ONLY");
1140 gMC->Gspos("TIPP",1,"TIRC",0.,1.1,0.,0,"ONLY");
1142 //----------------------------------------------
1143 // Tpc Readout Chambers Empty spaces - for both
1144 // inner and outer sectors
1145 //----------------------------------------------
1147 gMC->Gsvolu("TRCE","TRD1",idtmed[0],dm,0);
1149 // Inner sector - 4 spaces
1160 space = rr*tanAlpha-dm[0];
1162 for(Int_t nsLow=0;nsLow<4;nsLow++){
1165 dm[1]= rr*tanAlpha - space;
1169 gMC->Gsposp("TRCE",nsLow+1,"TIRC",0.,-0.8,zz,0,"ONLY",dm,4);
1175 gMC->Gsposp("TRCE",nsLow+5,"TIC1",0.,1.05,zz-2.1,0,"ONLY",dm,4);
1178 dm[0] = rr*tanAlpha - space;
1184 // dm[1] - this is the dm[1] from the previous TRCE
1188 gMC->Gsposp("TRCE",9,"TIC1",0.,-1.2,0.,0,"ONLY",dm,4);
1191 // TPc Space for Connectors
1198 gMC->Gsvolu("TPSC","BOX ",idtmed[0],dm,3);
1206 gMC->Gsvolu("TPCC","BOX ",idtmed[13],dm,3);
1208 gMC->Gspos("TPCC",1,"TPSC",0.,0.15,0.,0,"ONLY");
1215 Float_t phi1,phi2,phi3,theta1,theta2,theta3; // rotation angles
1217 // inner part of the inner sector - 2 x 20 holes
1219 astep = 20.00096874/19.;
1221 alpha = 10.00048437-astep;
1233 for(ncon=0;ncon<20;ncon++){
1239 phi3 = (alpha>0) ? 0. : 180.;
1240 theta3 = TMath::Abs(alpha);
1242 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1246 gMC->Gspos("TPSC",ncon+1,"TIRC",x1,0.3,-12.7875,idrotm[nRotMat],"ONLY");
1247 gMC->Gspos("TPSC",ncon+21,"TIRC",x2,0.3,-2.8625,idrotm[nRotMat],"ONLY");
1258 // outer part of the inner sector - 2 x 25 holes
1260 astep = 20.00096874/24.;
1261 alpha = 10.00048437-astep;
1269 for(ncon=0;ncon<25;ncon++){
1275 phi3 = (alpha>0) ? 0. : 180.;
1276 theta3 = TMath::Abs(alpha);
1278 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1282 gMC->Gspos("TPSC",ncon+41,"TIRC",x1,0.3,7.0625,idrotm[nRotMat],"ONLY");
1283 gMC->Gspos("TPSC",ncon+66,"TIRC",x2,0.3,16.9875,idrotm[nRotMat],"ONLY");
1294 //--------------------------------------------------------------------------
1295 // TPC Outer Readout Chambers
1296 // this is NOT a final design
1297 //--------------------------------------------------------------------------
1301 dm[2]= 1.5; //thickness
1304 gMC->Gsvolu("TORC","TRD1",idtmed[4],dm,4);
1306 //------------------------------------------------
1307 // Tpc Outer readout chamber Pad Plane
1308 //------------------------------------------------
1312 gMC->Gsvolu("TOPP","TRD1",idtmed[12],dm,4);
1314 dm[0] -= 1.218511934;
1315 dm[1] -= 1.218511934;
1318 gMC->Gsvolu("TOC3","TRD1",idtmed[1],dm,4);
1320 gMC->Gspos("TOC3",1,"TOPP",0.,0.15,0.,0,"ONLY");
1322 gMC->Gspos("TOPP",1,"TORC",0.,1.0,0.,0,"ONLY");
1332 gMC->Gsposp("TRCE",10,"TORC",0.,-0.8,-2.15,0,"ONLY",dm,4);
1339 gMC->Gsvolu("TOC1","TRD1",idtmed[4],dm,4);
1346 gMC->Gsposp("TRCE",11,"TOC1",0.,0.,0.,0,"ONLY",dm,4);
1350 //-----------------------------------------------
1351 // Tpc Services Support Wheel
1352 //-----------------------------------------------
1367 gMC->Gsvolu("TSSW","PGON",idtmed[4],dm,10);
1369 // Tpc Services Wheel Cover
1374 gMC->Gsvolu("TSWC","PGON",idtmed[4],dm,10);
1376 // Tpc Service wheel Cover Empty space
1383 gMC->Gsvolu("TSCE","TRD1",idtmed[0],dm,4);
1385 // Tpc services Wheel Empty Spaces
1392 gMC->Gsvolu("TWES","TRD1",idtmed[0],dm,4);
1394 // Tpc Services Wheel Bars
1396 gMC->Gsvolu("TSWB","TRD1",idtmed[4],dm,0);
1406 gMC->Gsposp("TSWB",1,"TWES",0.,0.,-85.125,0,"ONLY",dm,4);
1411 gMC->Gsposp("TSWB",2,"TWES",0.,0.,85.125,0,"ONLY",dm,4);
1413 // TPc ELectronics - right now 30% X0 Si
1420 gMC->Gsvolu("TPEL","TRD1",idtmed[11],dm,4);
1421 gMC->Gspos("TPEL",1,"TWES",0.,0.,0.,0,"ONLY");
1423 //--------------------------------------------------------------------------
1425 //--------------------------------------------------------------------------
1427 // TPc Main Wheel - Al
1433 gMC->Gsvolu("TPMW","TUBE",idtmed[4],dm,3);
1435 // TPc Extra Wheel (to avoid overlapping) - Al
1441 gMC->Gsvolu("TPEW","TUBE",idtmed[4],dm,3);
1443 //--------------------------------------------------------------------------
1444 // Tpc Empty Space for the Readout chambers
1445 //--------------------------------------------------------------------------
1449 Float_t dR = 0.5*(rUp-rLow);
1451 space= 1.4/cosAlpha; // wheel ribs are 2.8 cm wide
1453 dm[0]= rLow*tanAlpha-space;
1454 dm[1]= rUp*tanAlpha-space;
1458 gMC->Gsvolu("TESR","TRD1",idtmed[0],dm,4);
1463 gMC->Gspos("TIC1",1,"TESR",0.,0.75,-dR+23.97,0,"ONLY");
1468 gMC->Gspos("TOC1",1,"TESR",0.,0.75,dR-55.02,0,"ONLY");
1470 // Tpc Empty Space Bars - Al (daughters of TESR)
1474 gMC->Gsvolu("TESB","TRD1",idtmed[4],dm,0);
1478 dm[0]= rLow*tanAlpha-space;
1479 dm[1]= 88.7*tanAlpha-space;
1485 gMC->Gsposp("TESB",1,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1489 dm[0]= 131.65*tanAlpha-space;
1490 dm[1]= 136.5*tanAlpha-space;
1493 zBar = -dR +131.65+dm[3]-rLow;
1495 gMC->Gsposp("TESB",2,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1499 dm[0]= 240.4*tanAlpha-space;
1500 dm[1]= rUp*tanAlpha-space;
1505 gMC->Gsposp("TESB",3,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1507 //------------------------------------------------------
1508 // TPc Lower "S" Sectors
1509 //------------------------------------------------------
1512 Float_t inSecLowEdge = fTPCParam->GetInnerRadiusLow();
1513 Float_t inSecUpEdge = fTPCParam->GetInnerRadiusUp();
1515 dm[0] = inSecLowEdge*TMath::Tan(0.5*innerOpenAngle)-0.01;
1516 dm[1] = inSecUpEdge*TMath::Tan(0.5*innerOpenAngle)-0.01;
1517 dm[2] = 0.5*(250. - 0.3);
1518 dm[3] = 0.5*(inSecUpEdge-inSecLowEdge);
1520 gMC->Gsvolu("TPLS", "TRD1", idtmed[2], dm, 4); // sensitive
1522 //----------------------------------------------------------
1523 // TPc Upper Sectors
1524 //----------------------------------------------------------
1526 Float_t ouSecLowEdge = fTPCParam->GetOuterRadiusLow();
1527 Float_t ouSecUpEdge = fTPCParam->GetOuterRadiusUp();
1529 dm[0] = ouSecLowEdge*TMath::Tan(0.5*outerOpenAngle)-0.01;
1530 dm[1] = ouSecUpEdge*TMath::Tan(0.5*outerOpenAngle)-0.01;
1531 dm[2] = 0.5*(250. - 0.3);
1532 dm[3] = 0.5*(ouSecUpEdge-ouSecLowEdge);
1534 gMC->Gsvolu("TPUS", "TRD1", idtmed[2], dm, 4); // sensitive
1537 // if sensitive strips selected
1541 gMC->Gsvolu("TPSS","TRD1",idtmed[2],dm,0); // sensitive
1543 Int_t nofStrips,nstr;
1545 Float_t stripThick = 0.01; // 100 microns
1550 nofStrips = fTPCParam->GetNRowLow();
1551 deadSpace = fTPCParam->GetInnerWireMount();
1553 dm[2] = 0.5*(250. - 0.3);
1554 dm[3] = 0.5 * stripThick;
1556 for(nstr=0;nstr<nofStrips;nstr++){
1558 r1 = fTPCParam->GetPadRowRadiiLow(nstr);
1559 r2 = r1 + stripThick;
1560 dm[0] = r1 * TMath::Tan(0.5*innerOpenAngle) - deadSpace;
1561 dm[1] = r2 * TMath::Tan(0.5*innerOpenAngle) - deadSpace;
1562 zs = -inSecLowEdge -0.5*(inSecUpEdge-inSecLowEdge);
1566 gMC->Gsposp("TPSS", nstr+1, "TPLS", 0., 0., zs, 0, "ONLY", dm, 4);
1568 gMC->Gsord("TPLS",3);
1572 Int_t nsSave = nofStrips;
1576 nofStrips = fTPCParam->GetNRowUp();
1577 deadSpace = fTPCParam->GetOuterWireMount();
1579 dm[2] = 0.5*(250. - 0.3);
1580 dm[3] = 0.5 * stripThick;
1582 for(nstr=0;nstr<nofStrips;nstr++){
1584 r1 = fTPCParam->GetPadRowRadiiUp(nstr);
1585 r2 = r1 + stripThick;
1586 dm[0] = r1 * TMath::Tan(0.5*outerOpenAngle) - deadSpace;
1587 dm[1] = r2 * TMath::Tan(0.5*outerOpenAngle) - deadSpace;
1588 zs = -ouSecLowEdge -0.5*(ouSecUpEdge-ouSecLowEdge);
1592 gMC->Gsposp("TPSS", nstr+1+nsSave, "TPUS", 0., 0., zs, 0, "ONLY", dm, 4);
1597 //-------------------------------------------------------
1598 // positioning of the empty spaces into the main wheel
1599 // and readout chambers and sectors into the drift gas
1600 //-------------------------------------------------------
1602 Float_t rCenter,xc,yc;
1603 Float_t rInner,rOuter; // center of the inner and outer chamber
1610 for(Int_t ns=0; ns<nInnerSector;ns++){
1612 phi1 = ns * innerOpenAngle + innerAngleShift;
1613 phi1 *= kRaddeg; // in degrees
1615 phi1 = (Float_t)TMath::Nint(phi1) + 270.;
1617 if (phi1 > 360.) phi1 -= 360.;
1622 phi3 = ns * innerOpenAngle + innerAngleShift;
1623 phi3 *= kRaddeg; // in degrees
1625 phi3 = (Float_t)TMath::Nint(phi3);
1627 if(phi3 > 360.) phi3 -= 360.;
1631 // "holes"->End plate
1633 xc = rCenter*TMath::Cos(phi3*kDegrad);
1634 yc = rCenter*TMath::Sin(phi3*kDegrad);
1636 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1638 gMC->Gspos("TESR",ns+1,"TPMW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1640 // TSCE->TSWC (services wheel volumes)
1642 xc = 166.142*TMath::Cos(phi3*kDegrad);
1643 yc = 166.142*TMath::Sin(phi3*kDegrad);
1645 gMC->Gspos("TSCE",ns+1,"TSWC",xc,yc,0.,idrotm[nRotMat],"ONLY");
1646 gMC->Gspos("TWES",ns+1,"TSSW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1648 // readout chambers->TDGN (drift gas)
1650 xc = rInner*TMath::Cos(phi3*kDegrad);
1651 yc = rInner*TMath::Sin(phi3*kDegrad);
1653 gMC->Gspos("TIRC",ns+1,"TDGN",xc,yc,252.,idrotm[nRotMat],"ONLY");
1655 // here lower sectors
1659 // all lower sectors are positioned
1661 gMC->Gspos("TPLS",ns+1,"TDGN",xc,yc,125.15,idrotm[nRotMat],"ONLY");
1663 Gspos("TPLS",ns+nInnerSector+1,"TDGN",xc,yc,-125.15,idrotm[nRotMat],"ONLY");
1667 // only selected sectors are positioned (up to 6 sectors)
1669 for(Int_t sel=0;sel<6;sel++){
1671 if(fSecLows[sel] == ns){
1672 gMC->Gspos("TPLS",ns+1,"TDGN",xc,yc,125.15,idrotm[nRotMat],"ONLY");
1674 else if(fSecLows[sel] == ns+nInnerSector){
1676 Gspos("TPLS",ns+nInnerSector+1,"TDGN",xc,yc,-125.15,idrotm[nRotMat],"ONLY");
1679 } // lower sectors finished
1681 xc = rOuter*TMath::Cos(phi3*kDegrad);
1682 yc = rOuter*TMath::Sin(phi3*kDegrad);
1684 gMC->Gspos("TORC",ns+1,"TDGN",xc,yc,252.1,idrotm[nRotMat],"ONLY");
1686 // here upper sectors
1690 // all upper sectors
1692 gMC->Gspos("TPUS",ns+1,"TDGN",xc,yc,125.15,idrotm[nRotMat],"ONLY");
1694 Gspos("TPUS",ns+nOuterSector+1,"TDGN",xc,yc,-125.15,idrotm[nRotMat],"ONLY");
1698 // only selected sectors (up to 12)
1700 for(Int_t sel=0;sel<12;sel++){
1701 if(fSecUps[sel] == ns+2*nInnerSector){
1702 gMC->Gspos("TPUS",ns+1,"TDGN",xc,yc,125.15,idrotm[nRotMat],"ONLY");
1704 else if(fSecUps[sel] == ns+2*nInnerSector+nOuterSector){
1706 Gspos("TPUS",ns+nOuterSector+1,"TDGN",xc,yc,-125.15,idrotm[nRotMat],"ONLY");
1709 } // upper sectors finished
1713 theta2 = 0.; // reflection, needed for readout chambers!
1715 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1717 xc = rInner*TMath::Cos(phi3*kDegrad);
1718 yc = rInner*TMath::Sin(phi3*kDegrad);
1720 gMC->Gspos("TIRC",ns+nInnerSector+1,"TDGN",xc,yc,-252.,idrotm[nRotMat],"ONLY");
1722 xc = rOuter*TMath::Cos(phi3*kDegrad);
1723 yc = rOuter*TMath::Sin(phi3*kDegrad);
1725 gMC->Gspos("TORC",ns+nOuterSector+1,"TDGN",xc,yc,-252.1,idrotm[nRotMat],"ONLY");
1732 // reflection matrix
1741 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1746 gMC->Gspos("TPMW",1,"TPC ",0.,0.,256.6,0,"ONLY");
1747 gMC->Gspos("TPMW",2,"TPC ",0.,0.,-256.6,idrotm[nRotMat],"ONLY");
1748 gMC->Gspos("TPEW",1,"TPC ",0.,0.,257.65,0,"ONLY");
1749 gMC->Gspos("TPEW",2,"TPC ",0.,0.,-257.65,0,"ONLY");
1753 //-------------------------------------------------------
1754 // Tpc High Voltage Membrane - NOMEX honeycomb
1755 //-------------------------------------------------------
1774 gMC->Gsvolu("THVM","PGON",idtmed[6],dm,10);
1776 gMC->Gspos("THVM",1,"TDGN",0.,0.,0.,0,"ONLY");
1778 //----------------------------------------------------------
1779 // TPc Support Rods - MAKROLON
1780 //----------------------------------------------------------
1786 gMC->Gsvolu("TPSR","TUBE",idtmed[7],dm,3);
1788 for(Int_t nrod=1;nrod<18;nrod++){
1789 Float_t angle=innerOpenAngle*(Float_t)nrod;
1791 xc=82.4*TMath::Cos(angle);
1792 yc=82.4*TMath::Sin(angle);
1794 gMC->Gspos("TPSR",nrod,"TDGN",xc,yc,126.95,0,"ONLY");
1795 gMC->Gspos("TPSR",nrod+17,"TDGN",xc,yc,-126.95,0,"ONLY");
1797 xc=254.2*TMath::Cos(angle);
1798 yc=254.2*TMath::Sin(angle);
1800 gMC->Gspos("TPSR",nrod+34,"TDGN",xc,yc,126.95,0,"ONLY");
1801 gMC->Gspos("TPSR",nrod+51,"TDGN",xc,yc,-126.95,0,"ONLY");
1805 //----------------------------------------------------------
1806 // Tpc High Voltage rod - MAKROLON + Copper cable
1807 //----------------------------------------------------------
1809 // rod with cable (Left)
1815 gMC->Gsvolu("THVL","TUBE",idtmed[7],dm,3);
1823 gMC->Gsvolu("THVC","TUBE",idtmed[10],dm,3);
1831 gMC->Gsvolu("THVE","TUBE",idtmed[1],dm,3);
1833 gMC->Gspos("THVC",1,"THVL",0.,0.,0.,0,"ONLY");
1834 gMC->Gspos("THVE",1,"THVL",0.,0.,0.,0,"ONLY");
1836 // rod without cable
1842 gMC->Gsvolu("THVR","TUBE",idtmed[7],dm,3);
1846 gMC->Gspos("THVL",1,"TDGN",82.4,0.,-126.95,0,"ONLY");
1847 gMC->Gspos("THVL",2,"TDGN",254.2,0.,-126.95,0,"ONLY");
1849 gMC->Gspos("THVR",1,"TDGN",82.4,0.,126.95,0,"ONLY");
1850 gMC->Gspos("THVR",2,"TDGN",254.2,0.,126.95,0,"ONLY");
1854 gMC->Gspos("TDGN",1,"TPC ",0.,0.,0.,0,"ONLY");
1856 // services wheel cover -> wheel
1859 gMC->Gspos("TSWC",1,"TSSW",0.,0.,4.5,0,"ONLY");
1860 gMC->Gspos("TSWC",2,"TSSW",0.,0.,-4.5,0,"ONLY");
1863 // put the wheel into the TPC
1865 gMC->Gspos("TSSW",1,"TPC ",0.,0.,278.7,0,"ONLY");
1866 gMC->Gspos("TSSW",2,"TPC ",0.,0.,-278.7,0,"ONLY");
1868 gMC->Gsord("TPMW",6);
1869 gMC->Gsord("TPLS",3);
1870 gMC->Gsord("TPUS",3);
1871 gMC->Gsord("TDGN",6);
1872 gMC->Gsord("TSSW",6);
1873 gMC->Gsord("TSWC",6);
1875 // put the TPC into ALIC (main mother volume)
1877 gMC->Gspos("TPC ", 1, "ALIC", 0, 0, 0, 0, "ONLY");
1879 } // end of function
1881 //_____________________________________________________________________________
1882 void AliTPCv2::DrawDetector()
1885 // Draw a shaded view of the Time Projection Chamber version 1
1888 // Set everything unseen
1889 gMC->Gsatt("*", "seen", -1);
1891 // Set ALIC mother transparent
1892 gMC->Gsatt("ALIC","SEEN",0);
1894 // Set the volumes visible
1897 gMC->Gsatt("TPC ","SEEN",0);
1898 gMC->Gsatt("TOIN","SEEN",1);
1899 gMC->Gsatt("TOIN","COLO",7);
1900 gMC->Gsatt("TPCR","SEEN",0);
1901 gMC->Gsatt("TOCV","SEEN",1);
1902 gMC->Gsatt("TOCV","COLO",4);
1903 gMC->Gsatt("TSA1","SEEN",0);
1904 gMC->Gsatt("TSA2","SEEN",0);
1905 gMC->Gsatt("TSA3","SEEN",0);
1906 gMC->Gsatt("TSA4","SEEN",0);
1907 gMC->Gsatt("TOFC","SEEN",1);
1908 gMC->Gsatt("TOFC","COLO",4);
1909 gMC->Gsatt("TSA5","SEEN",0);
1910 gMC->Gsatt("TSA6","SEEN",0);
1911 gMC->Gsatt("TSA7","SEEN",0);
1912 gMC->Gsatt("TSA8","SEEN",0);
1913 gMC->Gsatt("TIIN","COLO",7);
1914 gMC->Gsatt("TIIN","SEEN",1);
1915 gMC->Gsatt("TICL","SEEN",0);
1916 gMC->Gsatt("TSA9","SEEN",0);
1917 gMC->Gsatt("TS10","SEEN",0);
1918 gMC->Gsatt("TS11","SEEN",0);
1919 gMC->Gsatt("TS12","SEEN",0);
1920 gMC->Gsatt("TICR","SEEN",0);
1921 gMC->Gsatt("TS13","SEEN",0);
1922 gMC->Gsatt("TS14","SEEN",0);
1923 gMC->Gsatt("TS15","SEEN",0);
1924 gMC->Gsatt("TS16","SEEN",0);
1925 gMC->Gsatt("TIFC","SEEN",1);
1926 gMC->Gsatt("TIFC","COLO",4);
1927 gMC->Gsatt("TS17","SEEN",0);
1928 gMC->Gsatt("TS18","SEEN",0);
1929 gMC->Gsatt("TS19","SEEN",0);
1930 gMC->Gsatt("TS20","SEEN",0);
1931 gMC->Gsatt("TS21","SEEN",0);
1932 gMC->Gsatt("TS22","SEEN",0);
1933 gMC->Gsatt("TS23","SEEN",0);
1934 gMC->Gsatt("TS24","SEEN",0);
1935 gMC->Gsatt("TDGN","SEEN",0);
1936 gMC->Gsatt("TIRC","SEEN",0);
1937 gMC->Gsatt("TIC1","SEEN",1);
1938 gMC->Gsatt("TIPP","SEEN",0);
1939 gMC->Gsatt("TIC3","SEEN",0);
1940 gMC->Gsatt("TRCE","SEEN",0);
1941 gMC->Gsatt("TPSC","SEEN",0);
1942 gMC->Gsatt("TPCC","SEEN",0);
1943 gMC->Gsatt("TORC","SEEN",0);
1944 gMC->Gsatt("TOPP","SEEN",0);
1945 gMC->Gsatt("TOC3","SEEN",0);
1946 gMC->Gsatt("TOC1","SEEN",1);
1947 gMC->Gsatt("TSSW","SEEN",1);
1948 gMC->Gsatt("TSWC","SEEN",1);
1949 gMC->Gsatt("TSCE","SEEN",1);
1950 gMC->Gsatt("TSSW","COLO",3);
1951 gMC->Gsatt("TSWC","COLO",3);
1952 gMC->Gsatt("TSCE","COLO",6);
1953 gMC->Gsatt("TWES","SEEN",0);
1954 gMC->Gsatt("TSWB","SEEN",0);
1955 gMC->Gsatt("TPEL","SEEN",0);
1956 gMC->Gsatt("TPMW","SEEN",1);
1957 gMC->Gsatt("TPEW","SEEN",1);
1958 gMC->Gsatt("TESR","SEEN",1);
1959 gMC->Gsatt("TPMW","COLO",12);
1960 gMC->Gsatt("TPEW","COLO",12);
1961 gMC->Gsatt("TWES","COLO",5);
1962 gMC->Gsatt("TIC1","COLO",5);
1963 gMC->Gsatt("TOC1","COLO",5);
1964 gMC->Gsatt("TESB","SEEN",0);
1965 gMC->Gsatt("TPLS","SEEN",0);
1966 gMC->Gsatt("TPUS","SEEN",0);
1967 gMC->Gsatt("TPSS","SEEN",0);
1968 gMC->Gsatt("THVM","SEEN",1);
1969 gMC->Gsatt("THVM","COLO",11);
1970 gMC->Gsatt("TPSR","SEEN",0);
1971 gMC->Gsatt("THVL","SEEN",0);
1972 gMC->Gsatt("THVC","SEEN",0);
1973 gMC->Gsatt("THVE","SEEN",0);
1974 gMC->Gsatt("THVR","SEEN",0);
1977 gMC->Gdopt("hide", "on");
1978 gMC->Gdopt("shad", "on");
1979 gMC->Gsatt("*", "fill", 7);
1980 gMC->SetClipBox(".");
1981 gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1982 gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1983 gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1984 gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1985 gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1986 gMC->DefaultRange();
1987 gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1988 gMC->Gdhead(1111, "Time Projection Chamber");
1989 gMC->Gdman(18, 4, "MAN");
1990 gMC->Gdopt("hide","off");
1993 //_____________________________________________________________________________
1994 void AliTPCv2::CreateMaterials()
1997 // Define materials for version 2 of the Time Projection Chamber
2000 AliTPC::CreateMaterials();
2003 //_____________________________________________________________________________
2004 void AliTPCv2::Init()
2007 // Initialises version 2 of the TPC after that it has been built
2010 Int_t *idtmed = fIdtmed->GetArray();
2013 fIdSens=gMC->VolId("TPSS"); // sensitive strips (not always used)
2014 fIdLSec=gMC->VolId("TPLS"); // lower sector
2015 fIdUSec=gMC->VolId("TPUS"); // upper sector
2017 gMC->SetMaxNStep(30000); // max. number of steps increased
2019 gMC->Gstpar(idtmed[2],"LOSS",5); // specific energy loss
2021 printf("*** TPC version 2 initialized ***\n");
2022 printf("Maximum number of steps = %d\n",gMC->GetMaxNStep());
2028 //_____________________________________________________________________________
2029 void AliTPCv2::StepManager()
2032 // Called for every step in the Time Projection Chamber
2036 // parameters used for the energy loss calculations
2038 const Float_t kprim = 14.35; // number of primary collisions per 1 cm
2039 const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
2040 const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
2043 const Float_t kbig = 1.e10;
2048 TClonesArray &lhits = *fHits;
2051 vol[1]=0; // preset row number to 0
2055 gMC->SetMaxStep(kbig);
2057 if(!gMC->IsTrackAlive()) return; // particle has disappeared
2059 Float_t charge = gMC->TrackCharge();
2061 if(TMath::Abs(charge)<=0.) return; // take only charged particles
2063 // check the sensitive volume
2065 id = gMC->CurrentVolID(copy); // current volume Id
2068 vol[0] = copy-1; // lower sector number
2070 else if(id == fIdUSec){
2071 vol[0] = copy+fTPCParam->GetNInnerSector()-1; // upper sector number
2073 else if(id == fIdSens && gMC->IsTrackEntering()){
2075 // track is entering the sensitive strip
2077 vol[1]= copy-1; // row number (absolute)
2081 id = gMC->CurrentVolOffID(1,copy);
2087 vol[0] = copy-1; // sector number
2094 vol[0] = copy-1+fTPCParam->GetNInnerSector(); // sector number
2095 vol[1] -= fTPCParam->GetNRowLow(); // row number
2101 // because Jouri wants to have this
2103 gMC->TrackMomentum(p);
2107 hits[3]=0.; // this hit has no energy loss
2108 new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2112 gMC->TrackPosition(p);
2116 hits[3]=0.; // this hit has no energy loss
2117 new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2123 //-----------------------------------------------------------------
2124 // charged particle is in the sensitive volume
2125 //-----------------------------------------------------------------
2127 if(gMC->TrackStep() > 0) {
2129 Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
2130 nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
2132 gMC->TrackPosition(p);
2136 hits[3]=(Float_t)nel;
2140 new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2144 // Stemax calculation for the next step
2148 gMC->TrackMomentum(mom);
2149 Float_t ptot=mom.Rho();
2150 Float_t betaGamma = ptot/gMC->TrackMass();
2152 Int_t pid=gMC->TrackPid();
2153 if((pid==kElectron || pid==kPositron) && ptot > 0.002)
2155 pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
2159 pp=kprim*BetheBloch(betaGamma);
2160 if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
2164 gMC->Rndm(random,1); // good, old GRNDM from Geant3
2166 Double_t rnd = (Double_t)random[0];
2168 gMC->SetMaxStep(-TMath::Log(rnd)/pp);
2172 //_____________________________________________________________________________
2173 Float_t AliTPCv2::BetheBloch(Float_t bg)
2176 // Bethe-Bloch energy loss formula
2178 const Double_t kp1=0.76176e-1;
2179 const Double_t kp2=10.632;
2180 const Double_t kp3=0.13279e-4;
2181 const Double_t kp4=1.8631;
2182 const Double_t kp5=1.9479;
2184 Double_t dbg = (Double_t) bg;
2186 Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
2188 Double_t aa = TMath::Power(beta,kp4);
2189 Double_t bb = TMath::Power(1./dbg,kp5);
2191 bb=TMath::Log(kp3+bb);
2193 return ((Float_t)((kp2-aa-bb)*kp1/aa));