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 1.27 2001/05/08 16:03:06 kowal2
19 Geometry update according to the latest technical spec.
21 Revision 1.26 2001/04/27 15:23:07 kowal2
22 Correct materian in the central part of the inner containment vessel
24 Revision 1.25 2001/04/26 06:15:12 kowal2
25 Corrected bug in the inner containment vessel (cones)
27 Revision 1.24 2001/04/24 11:22:01 kowal2
28 Protection against too small betagamma
30 Revision 1.23 2001/04/24 11:17:33 kowal2
33 Revision 1.22 2001/03/13 13:07:34 kowal2
34 Corrected bug in the TPC mother volume geometry.
37 Revision 1.21 2000/11/30 11:48:50 kowal2
38 TLorentzVector.h adde to satisfy the latest changes by Federico
40 Revision 1.20 2000/11/14 10:48:57 kowal2
41 Correct material used for TSA4. Thanks to J. Barbosa.
43 Revision 1.19 2000/11/06 17:24:10 kowal2
44 Corrected bug in the outer containment vessel and
45 the outer field cage geometry.
48 Revision 1.18 2000/11/02 16:55:24 kowal2
49 Corrected bug in the inner containment vessel geometry.
52 Revision 1.17 2000/11/02 07:24:11 kowal2
53 Correction in the TPC geometry.
54 Changes due to the new hit structure.
56 Revision 1.16 2000/10/02 21:28:18 fca
57 Removal of useless dependecies via forward declarations
59 Revision 1.15 2000/07/10 20:57:39 hristov
60 Update of TPC code and macros by M.Kowalski
62 Revision 1.14 2000/06/30 12:07:50 kowal2
63 Updated from the TPC-PreRelease branch
65 Revision 1.13.2.4 2000/06/26 07:39:42 kowal2
66 Changes to obey the coding rules
68 Revision 1.13.2.3 2000/06/25 08:38:41 kowal2
69 Splitted from AliTPCtracking
71 Revision 1.13.2.2 2000/06/16 12:58:13 kowal2
72 Changed parameter settings
74 Revision 1.13.2.1 2000/06/09 07:15:07 kowal2
76 Defaults loaded automatically (hard-wired)
77 Optional parameters can be set via macro called in the constructor
79 Revision 1.13 2000/05/15 10:00:30 kowal2
80 Corrected bug in the TPC geometry, thanks to Ivana Hrivnacova
82 Revision 1.12 2000/04/17 09:37:33 kowal2
83 removed obsolete AliTPCDigitsDisplay.C
85 Revision 1.11.8.2 2000/04/10 08:36:12 kowal2
87 Updated readout chambers
88 Some modifications to StepManager by M. Kowalski
90 Revision 1.11.8.1 2000/04/10 07:56:53 kowal2
91 Not used anymore - removed
93 Revision 1.11 1999/11/04 17:28:07 fca
94 Correct barrel part of HV Degrader
96 Revision 1.10 1999/10/14 16:52:08 fca
97 Only use PDG codes and not GEANT ones
99 Revision 1.9 1999/10/08 06:27:23 fca
100 Corrected bug in the HV degrader geometry, thanks to G.Tabary
102 Revision 1.8 1999/10/04 13:39:55 fca
103 Correct array index problem
105 Revision 1.7 1999/09/29 09:24:34 fca
106 Introduction of the Copyright and cvs Log
111 ///////////////////////////////////////////////////////////////////////////////
113 // Time Projection Chamber version 3 -- detailed TPC and slow simulation //
117 <img src="picts/AliTPCv3Class.gif">
122 ///////////////////////////////////////////////////////////////////////////////
126 #include "AliTPCv3.h"
129 #include "AliConst.h"
130 #include "AliTPCDigitsArray.h"
131 #include"AliTPCParam.h"
132 #include"AliTPCParamSR.h"
134 #include <TInterpreter.h>
135 #include "TLorentzVector.h"
136 #include "AliTPCTrackHits.h"
139 //_____________________________________________________________________________
141 AliTPCv3::AliTPCv3(){
147 //_____________________________________________________________________________
148 AliTPCv3::AliTPCv3(const char *name, const char *title) :
152 // Standard constructor for Time Projection Chamber version 3
155 SetBufferSize(128000);
158 SetGasMixt(2,20,10,-1,0.9,0.1,0.);
161 fTPCParam->Write(fTPCParam->GetTitle());
166 //_____________________________________________________________________________
167 void AliTPCv3::CreateGeometry()
170 // Creation of the TPC coarse geometry (version 3)
171 // The whole drift volume is sensitive
172 // Origin Marek Kowalski Cracow
176 <img src="picts/AliTPCgif">
181 <img src="picts/AliTPCv3Tree.gif">
186 Int_t *idtmed = fIdtmed->GetArray(); // TPC media
188 Int_t idrotm[120]; // rotation matrices
190 Int_t nRotMat = 0; // actual number of rotation matrices
194 // Mother volume (Air) - all volumes will be positioned in it
249 gMC->Gsvolu("TPC ","PCON",idtmed[0],dm,27);
253 //-------------------------------------------------------------------
254 // Tpc Outer INsulator (CO2) - contains cont. vessel and field cage
255 //-------------------------------------------------------------------
297 gMC->Gsvolu("TOIN","PCON",idtmed[3],dm,21);
299 //----------------------------------------------------------------
300 // Tpc Outer Contaiment Vessel
301 // mother volume - Al, daughters - composite (sandwich)
302 //----------------------------------------------------------------
344 gMC->Gsvolu("TOCV","PCON",idtmed[4],dm,21);
346 // Daughter volumes - sandwich
348 // Tpc SAndwich 1 - Al
354 gMC->Gsvolu("TSA1","TUBE",idtmed[4],dm,3);
356 // Tpc SAndwich 2 - epoxy glue (I use Lexan)
361 gMC->Gsvolu("TSA2","TUBE",idtmed[14],dm,3);
363 // Tpc SAndwich 3 - Tedlar
368 gMC->Gsvolu("TSA3","TUBE",idtmed[9],dm,3);
371 // Tpc SAndwich 4 - fiber glass (G10)
376 gMC->Gsvolu("TSA4","TUBE",idtmed[12],dm,3);
378 // Tpc SAndwich 5 - NOMEX honeycomb
383 gMC->Gsvolu("TSA5","TUBE",idtmed[6],dm,3);
385 // 5->4->3->2->1->TCOV
388 gMC->Gspos("TSA5",1,"TSA4",0.,0.,0.,0,"ONLY");
389 gMC->Gspos("TSA4",1,"TSA3",0.,0.,0.,0,"ONLY");
390 gMC->Gspos("TSA3",1,"TSA2",0.,0.,0.,0,"ONLY");
391 gMC->Gspos("TSA2",1,"TSA1",0.,0.,0.,0,"ONLY");
393 gMC->Gspos("TSA1",1,"TOCV",0.,0.,3.,0,"ONLY");
397 gMC->Gspos("TOCV",1,"TOIN",0.,0.,0.,0,"ONLY");
399 //-------------------------------------------------------
400 // Tpc Outer Field Cage
401 // mother volume - Al, daughters - composite (sandwich)
402 //-------------------------------------------------------
444 gMC->Gsvolu("TOFC","PCON",idtmed[4],dm,21);
448 // Tpc SAndwich 6 - Tedlar
454 gMC->Gsvolu("TSA6","TUBE",idtmed[9],dm,3);
456 // Tpc SAndwich 7 - fiber glass
461 gMC->Gsvolu("TSA7","TUBE",idtmed[12],dm,3);
464 // Tpc SAndwich 8 - NOMEX
469 gMC->Gsvolu("TSA8","TUBE",idtmed[6],dm,3);
473 gMC->Gspos("TSA8",1,"TSA7",0.,0.,0.,0,"ONLY");
474 gMC->Gspos("TSA7",1,"TSA6",0.,0.,0.,0,"ONLY");
475 gMC->Gspos("TSA6",1,"TOFC",0.,0.,0.,0,"ONLY");
479 gMC->Gspos("TOFC",1,"TOIN",0.,0.,0.,0,"ONLY");
483 gMC->Gspos("TOIN",1,"TPC ",0.,0.,0.,0,"ONLY");
487 //--------------------------------------------------------------------
488 // Tpc Inner INsulator (CO2) - inner f.c. will be placed there
489 // Inner containment vessel will be placed directly in the TPC
490 //--------------------------------------------------------------------
520 gMC->Gsvolu("TIIN","PCON",idtmed[3],dm,15);
522 // the middle part of the F.C. is thinner - carve out the strip - Ne-CO2
528 gMC->Gsvolu("TII1","TUBE",idtmed[1],dm,3);
530 gMC->Gspos("TII1",1,"TIIN",0.,0.,0.,0,"ONLY");
532 //-----------------------------------------------------
533 // Tpc Inner Field Cage
534 // mother volume - Al, daughters - composite (sandwich)
535 //------------------------------------------------------
601 gMC->Gsvolu("TIFC","PCON",idtmed[4],dm,33);
603 // daughter volumes - central part
605 // Tpc Sandwich 9 -Tedlar
611 gMC->Gsvolu("TSA9","TUBE",idtmed[9],dm,3);
613 // Tpc Sandwich 10 - fiber glass (G10)
618 gMC->Gsvolu("TS10","TUBE",idtmed[12],dm,3);
620 // Tpc Sandwich 11 - NOMEX
625 gMC->Gsvolu("TS11","TUBE",idtmed[6],dm,3);
629 gMC->Gspos("TS11",1,"TS10",0.,0.,0.,0,"ONLY");
630 gMC->Gspos("TS10",1,"TSA9",0.,0.,0.,0,"ONLY");
632 gMC->Gspos("TSA9",1,"TIFC",0.,0.,0.,0,"ONLY");
634 // daughter volumes - outer parts (reinforced)
636 // Tpc Sandwich 12 -Tedlar
642 gMC->Gsvolu("TS12","TUBE",idtmed[9],dm,3);
644 // Tpc Sandwich 13 - fiber glass (G10)
649 gMC->Gsvolu("TS13","TUBE",idtmed[12],dm,3);
651 // Tpc Sandwich 14 - NOMEX
656 gMC->Gsvolu("TS14","TUBE",idtmed[6],dm,3);
660 gMC->Gspos("TS14",1,"TS13",0.,0.,0.,0,"ONLY");
661 gMC->Gspos("TS13",1,"TS12",0.,0.,0.,0,"ONLY");
663 gMC->Gspos("TS12",1,"TIFC",0.,0.,170.05,0,"ONLY");
664 gMC->Gspos("TS12",2,"TIFC",0.,0.,-170.05,0,"ONLY");
666 // place this inside the inner insulator
668 gMC->Gspos("TIFC",1,"TIIN",0.,0.,0.,0,"ONLY");
670 // and now in the TPC...
672 gMC->Gspos("TIIN",1,"TPC ",0.,0.,0.,0,"ONLY");
674 //---------------------------------------------------------
675 // Tpc Inner Containment vessel - Cones
676 //---------------------------------------------------------
730 gMC->Gsvolu("TICC","PCON",idtmed[4],dm,27);
732 Float_t phi1,phi2,phi3,theta1,theta2,theta3; // rotation angles
743 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
745 gMC->Gspos("TICC",1,"TPC ",0.,0.,0.,0,"ONLY");
746 gMC->Gspos("TICC",2,"TPC ",0.,0.,0.,idrotm[nRotMat],"ONLY");
749 //---------------------------------------------------------
750 // Tpc Inner Containment vessel - Middle part -Al
751 //---------------------------------------------------------
793 gMC->Gsvolu("TICM","PCON",idtmed[4],dm,21);
795 // Tpc Sandwich 15 - Al
801 gMC->Gsvolu("TS15","TUBE",idtmed[4],dm,3);
803 // Tpc Sandwich 16 - epoxy glue
808 gMC->Gsvolu("TS16","TUBE",idtmed[14],dm,3);
810 // Tpc Sandwich 17 - Tedlar
815 gMC->Gsvolu("TS17","TUBE",idtmed[9],dm,3);
817 // Tpc Sandwich 18 - carbon fiber
822 gMC->Gsvolu("TS18","TUBE",idtmed[15],dm,3);
824 // Tpc Sandwich 19 - Nomex
829 gMC->Gsvolu("TS19","TUBE",idtmed[6],dm,3);
831 // 19->18->17->16->15-> TICM
833 gMC->Gspos("TS19",1,"TS18",0.,0.,0.,0,"ONLY");
834 gMC->Gspos("TS18",1,"TS17",0.,0.,0.,0,"ONLY");
835 gMC->Gspos("TS17",1,"TS16",0.,0.,0.,0,"ONLY");
836 gMC->Gspos("TS16",1,"TS15",0.,0.,0.,0,"ONLY");
838 gMC->Gspos("TS15",1,"TICM ",0.,0.,0.,0,"ONLY");
841 // TPc inner cont. vessel Joints
847 gMC->Gsvolu("TPJ1","TUBE",idtmed[4],dm,3);
849 gMC->Gspos("TPJ1",1,"TPC ",0.,0.,72.3,0,"ONLY");
850 gMC->Gspos("TPJ1",2,"TPC ",0.,0.,-72.3,0,"ONLY");
882 gMC->Gsvolu("TPJ2","PCON",idtmed[4],dm,15);
884 gMC->Gspos("TPJ2",1,"TPC ",0.,0.,0.,0,"ONLY");
885 gMC->Gspos("TPJ2",2,"TPC ",0.,0.,0.,idrotm[nRotMat],"ONLY");
889 // Tpc Inner Containment vessel Seal (Viton, I use Lexan for a time being)
895 gMC->Gsvolu("TICS","TUBE",idtmed[14],dm,3);
897 gMC->Gspos("TICS",1,"TPC ",0.,0.,71.7,0,"ONLY");
898 gMC->Gspos("TICS",2,"TPC ",0.,0.,-71.7,0,"ONLY");
902 gMC->Gspos("TICM",1,"TPC ",0.,0.,0.,0,"ONLY");
906 nRotMat++; // prepare for the next rotation matrix
908 //---------------------------------------------------------
909 // Tpc Dift Gas volume Nonsensitive (Ne-CO2 90/10)
910 // and its daughters (HV membrane, rods, readout chambers)
911 //---------------------------------------------------------
917 gMC->Gsvolu("TDGS","TUBE",idtmed[2],dm,3);
919 // sector opening angles
921 Float_t innerOpenAngle = fTPCParam->GetInnerAngle();
923 // sector angle shift
925 Float_t innerAngleShift = fTPCParam->GetInnerAngleShift();
929 Int_t nInnerSector = fTPCParam->GetNInnerSector()/2;
930 Int_t nOuterSector = fTPCParam->GetNOuterSector()/2;
932 // All above parameters are identical for inner and outer
933 // sectors. The distinction is kept for the historical reasons
934 // and eventually will disappear.
936 Float_t tanAlpha = TMath::Tan(0.5*innerOpenAngle);
937 Float_t cosAlpha = TMath::Sqrt(1.+tanAlpha*tanAlpha);
940 //-------------------------------------------------------------------------
941 // Tpc Inner Readout Chambers
942 //-------------------------------------------------------------------------
946 dm[2]= 1.6; // thickness
949 gMC->Gsvolu("TIRC","TRD1",idtmed[4],dm,4);
951 // this volume will be positioned in the empty space
952 // of the end-cap to avoid overlaps
959 gMC->Gsvolu("TIC1","TRD1",idtmed[4],dm,4);
962 //------------------------------------------------
963 // Tpc Inner readout chamber Pad Plane
964 //------------------------------------------------
971 gMC->Gsvolu("TIPP","TRD1",idtmed[12],dm,4);
975 dm[0] -= 1.218511934;
976 dm[1] -= 1.218511934;
979 gMC->Gsvolu("TIC3","TRD1",idtmed[1],dm,4);
981 gMC->Gspos("TIC3",1,"TIPP",0.,0.15,0.,0,"ONLY");
983 gMC->Gspos("TIPP",1,"TIRC",0.,1.1,0.,0,"ONLY");
986 //----------------------------------------------
987 // Tpc Readout Chambers Empty spaces - for both
988 // inner and outer sectors
989 //----------------------------------------------
991 gMC->Gsvolu("TRCE","TRD1",idtmed[0],dm,0);
993 // Inner sector - 4 spaces
1004 space = rr*tanAlpha-dm[0];
1006 for(Int_t nsLow=0;nsLow<4;nsLow++){
1009 dm[1]= rr*tanAlpha - space;
1013 gMC->Gsposp("TRCE",nsLow+1,"TIRC",0.,-0.8,zz,0,"ONLY",dm,4);
1019 gMC->Gsposp("TRCE",nsLow+5,"TIC1",0.,1.05,zz-2.1,0,"ONLY",dm,4);
1022 dm[0] = rr*tanAlpha - space;
1028 // dm[1] - this is the dm[1] from the previous TRCE
1032 gMC->Gsposp("TRCE",9,"TIC1",0.,-1.2,0.,0,"ONLY",dm,4);
1035 // TPc Space for Connectors
1042 gMC->Gsvolu("TPSC","BOX ",idtmed[0],dm,3);
1050 gMC->Gsvolu("TPCC","BOX ",idtmed[13],dm,3);
1052 gMC->Gspos("TPCC",1,"TPSC",0.,0.15,0.,0,"ONLY");
1060 // inner part of the inner sector - 2 x 20 holes
1062 astep = 20.00096874/19.;
1064 alpha = 10.00048437-astep;
1076 for(ncon=0;ncon<20;ncon++){
1082 phi3 = (alpha>0) ? 0. : 180.;
1083 theta3 = TMath::Abs(alpha);
1085 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1089 gMC->Gspos("TPSC",ncon+1,"TIRC",x1,0.3,-12.7875,idrotm[nRotMat],"ONLY");
1090 gMC->Gspos("TPSC",ncon+21,"TIRC",x2,0.3,-2.8625,idrotm[nRotMat],"ONLY");
1101 // outer part of the inner sector - 2 x 25 holes
1103 astep = 20.00096874/24.;
1104 alpha = 10.00048437-astep;
1112 for(ncon=0;ncon<25;ncon++){
1118 phi3 = (alpha>0) ? 0. : 180.;
1119 theta3 = TMath::Abs(alpha);
1121 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1125 gMC->Gspos("TPSC",ncon+41,"TIRC",x1,0.3,7.0625,idrotm[nRotMat],"ONLY");
1126 gMC->Gspos("TPSC",ncon+66,"TIRC",x2,0.3,16.9875,idrotm[nRotMat],"ONLY");
1137 //--------------------------------------------------------------------------
1138 // TPC Outer Readout Chambers
1139 // this is NOT a final design
1140 //--------------------------------------------------------------------------
1144 dm[2]= 1.5; //thickness
1147 gMC->Gsvolu("TORC","TRD1",idtmed[4],dm,4);
1149 //------------------------------------------------
1150 // Tpc Outer readout chamber Pad Plane
1151 //------------------------------------------------
1155 gMC->Gsvolu("TOPP","TRD1",idtmed[12],dm,4);
1157 dm[0] -= 1.218511934;
1158 dm[1] -= 1.218511934;
1161 gMC->Gsvolu("TOC3","TRD1",idtmed[1],dm,4);
1163 gMC->Gspos("TOC3",1,"TOPP",0.,0.15,0.,0,"ONLY");
1165 gMC->Gspos("TOPP",1,"TORC",0.,1.0,0.,0,"ONLY");
1174 gMC->Gsposp("TRCE",10,"TORC",0.,-0.8,-2.15,0,"ONLY",dm,4);
1181 gMC->Gsvolu("TOC1","TRD1",idtmed[4],dm,4);
1188 gMC->Gsposp("TRCE",11,"TOC1",0.,0.,0.,0,"ONLY",dm,4);
1190 //-----------------------------------------------
1191 // Tpc Services Support Wheel
1192 //-----------------------------------------------
1207 gMC->Gsvolu("TSSW","PGON",idtmed[4],dm,10);
1209 // Tpc Services Wheel Cover
1214 gMC->Gsvolu("TSWC","PGON",idtmed[4],dm,10);
1216 // Tpc Service wheel Cover Empty space
1223 gMC->Gsvolu("TSCE","TRD1",idtmed[0],dm,4);
1225 // Tpc services Wheel Empty Spaces
1232 gMC->Gsvolu("TWES","TRD1",idtmed[0],dm,4);
1234 // Tpc Services Wheel Bars
1236 gMC->Gsvolu("TSWB","TRD1",idtmed[4],dm,0);
1246 gMC->Gsposp("TSWB",1,"TWES",0.,0.,-85.125,0,"ONLY",dm,4);
1251 gMC->Gsposp("TSWB",2,"TWES",0.,0.,85.125,0,"ONLY",dm,4);
1253 // TPc ELectronics - right now 30% X0 Si
1260 gMC->Gsvolu("TPEL","TRD1",idtmed[11],dm,4);
1261 gMC->Gspos("TPEL",1,"TWES",0.,0.,0.,0,"ONLY");
1263 //--------------------------------------------------------------------------
1265 //--------------------------------------------------------------------------
1267 // TPc Main Wheel - Al
1273 gMC->Gsvolu("TPMW","TUBE",idtmed[4],dm,3);
1275 //--------------------------------------------------------------------------
1276 // Tpc Empty Space for the Readout chambers
1277 //--------------------------------------------------------------------------
1281 Float_t dR = 0.5*(rUp-rLow);
1283 space= 1.5/cosAlpha; // wheel ribs are 3.0 cm wide
1285 dm[0]= rLow*tanAlpha-space;
1286 dm[1]= rUp*tanAlpha-space;
1290 gMC->Gsvolu("TESR","TRD1",idtmed[0],dm,4);
1294 gMC->Gspos("TIC1",1,"TESR",0.,0.75,-dR+23.97,0,"ONLY");
1298 gMC->Gspos("TOC1",1,"TESR",0.,0.75,dR-55.02,0,"ONLY");
1300 // Tpc Empty Space Bars - Al (daughters of TESR)
1304 gMC->Gsvolu("TESB","TRD1",idtmed[4],dm,0);
1308 dm[0]= rLow*tanAlpha-space;
1309 dm[1]= 88.7*tanAlpha-space;
1315 gMC->Gsposp("TESB",1,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1319 dm[0]= 131.65*tanAlpha-space;
1320 dm[1]= 136.5*tanAlpha-space;
1323 zBar = -dR +131.65+dm[3]-rLow;
1325 gMC->Gsposp("TESB",2,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1329 dm[0]= 240.4*tanAlpha-space;
1330 dm[1]= rUp*tanAlpha-space;
1335 gMC->Gsposp("TESB",3,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1337 // positioning of the empty spaces into the main wheel
1339 Float_t rCenter,xc,yc;
1340 Float_t rInner,rOuter; // center of the inner and outer chamber
1348 for(Int_t ns=0; ns<nInnerSector;ns++){
1350 phi1 = ns * innerOpenAngle + innerAngleShift;
1351 phi1 *= kRaddeg; // in degrees
1353 phi1 = (Float_t)TMath::Nint(phi1) + 270.;
1355 if (phi1 > 360.) phi1 -= 360.;
1360 phi3 = ns * innerOpenAngle + innerAngleShift;
1361 phi3 *= kRaddeg; // in degrees
1363 phi3 = (Float_t)TMath::Nint(phi3);
1365 if(phi3 > 360.) phi3 -= 360.;
1369 // "holes"->End plate
1371 xc = rCenter*TMath::Cos(phi3*kDegrad);
1372 yc = rCenter*TMath::Sin(phi3*kDegrad);
1374 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1376 gMC->Gspos("TESR",ns+1,"TPMW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1378 // TSCE->TSWC (services wheel volumes)
1380 xc = 166.142*TMath::Cos(phi3*kDegrad);
1381 yc = 166.142*TMath::Sin(phi3*kDegrad);
1383 gMC->Gspos("TSCE",ns+1,"TSWC",xc,yc,0.,idrotm[nRotMat],"ONLY");
1384 gMC->Gspos("TWES",ns+1,"TSSW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1387 // readout chambers->TDGS (drift gas)
1389 xc = rInner*TMath::Cos(phi3*kDegrad);
1390 yc = rInner*TMath::Sin(phi3*kDegrad);
1392 gMC->Gspos("TIRC",ns+1,"TDGS",xc,yc,252.,idrotm[nRotMat],"ONLY");
1394 xc = rOuter*TMath::Cos(phi3*kDegrad);
1395 yc = rOuter*TMath::Sin(phi3*kDegrad);
1397 gMC->Gspos("TORC",ns+1,"TDGS",xc,yc,252.1,idrotm[nRotMat],"ONLY");
1401 theta2 = 0.; // reflection
1403 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1405 xc = rInner*TMath::Cos(phi3*kDegrad);
1406 yc = rInner*TMath::Sin(phi3*kDegrad);
1408 gMC->Gspos("TIRC",ns+nInnerSector+1,"TDGS",xc,yc,-252.,idrotm[nRotMat],"ONLY");
1410 xc = rOuter*TMath::Cos(phi3*kDegrad);
1411 yc = rOuter*TMath::Sin(phi3*kDegrad);
1413 gMC->Gspos("TORC",ns+nOuterSector+1,"TDGS",xc,yc,-252.1,idrotm[nRotMat],"ONLY");
1420 gMC->Gspos("TPMW",1,"TPC ",0.,0.,256.6,0,"ONLY");
1421 gMC->Gspos("TPMW",2,"TPC ",0.,0.,-256.6,idrotm[0],"ONLY");
1423 //---------------------------------------------------------
1424 // Tpc High Voltage Membrane - 100 microns of mylar
1425 //---------------------------------------------------------
1431 gMC->Gsvolu("THVM","TUBE",idtmed[8],dm,3);
1433 gMC->Gspos("THVM",1,"TDGS",0.,0.,0.,0,"ONLY");
1435 // Tpc High Voltage membrane Holders
1437 gMC->Gsvolu("THVH","TUBE",idtmed[4],dm,0);
1447 gMC->Gsposp("THVH",1,"TDGS",0.,0.,0.,0,"ONLY",dm,3);
1455 gMC->Gsposp("THVH",2,"TDGS",0.,0.,0.,0,"ONLY",dm,3);
1457 //----------------------------------------------------------
1458 // TPc Support Rods - MAKROLON
1459 //----------------------------------------------------------
1464 gMC->Gsvolu("TPSR","TUBE",idtmed[7],dm,0); // inner and outer rods differ
1467 for(Int_t nrod=0;nrod<18;nrod++){
1468 Float_t angle=innerOpenAngle*(Float_t)nrod;
1470 xc=81.5*TMath::Cos(angle);
1471 yc=81.5*TMath::Sin(angle);
1475 gMC->Gsposp("TPSR",nrod+1,"TDGS",xc,yc,126.9,0,"ONLY",dm,3);
1476 gMC->Gsposp("TPSR",nrod+19,"TDGS",xc,yc,-126.9,0,"ONLY",dm,3);
1480 xc=254.25*TMath::Cos(angle);
1481 yc=254.25*TMath::Sin(angle);
1483 // rod number 54 contans the HV cable
1486 gMC->Gsposp("TPSR",nrod+37,"TDGS",xc,yc,127.,0,"ONLY",dm,3);
1487 gMC->Gsposp("TPSR",nrod+54,"TDGS",xc,yc,-127.,0,"ONLY",dm,3);
1492 //----------------------------------------------------------
1493 // Tpc High Voltage Rod - MAKROLON + Copper cable
1494 //----------------------------------------------------------
1496 // rod with cable (Left)
1502 gMC->Gsvolu("THVL","TUBE",idtmed[7],dm,3);
1510 gMC->Gsvolu("THVC","TUBE",idtmed[10],dm,3);
1518 gMC->Gsvolu("THVE","TUBE",idtmed[1],dm,3);
1520 gMC->Gspos("THVC",1,"THVL",0.,0.,0.,0,"ONLY");
1521 gMC->Gspos("THVE",1,"THVL",0.,0.,0.,0,"ONLY");
1523 // rod without cable
1529 gMC->Gsvolu("THVR","TUBE",idtmed[7],dm,3);
1531 gMC->Gspos("THVL",1,"TDGS",xc,yc,-127.,0,"ONLY");
1532 gMC->Gspos("THVR",1,"TDGS",xc,yc,127.,0,"ONLY");
1534 gMC->Gspos("TDGS",1,"TPC ",0.,0.,0.,0,"ONLY");
1536 // services wheel cover -> wheel
1539 gMC->Gspos("TSWC",1,"TSSW",0.,0.,4.5,0,"ONLY");
1540 gMC->Gspos("TSWC",2,"TSSW",0.,0.,-4.5,0,"ONLY");
1543 // put the wheel into the TPC
1545 gMC->Gspos("TSSW",1,"TPC ",0.,0.,278.7,0,"ONLY");
1546 gMC->Gspos("TSSW",2,"TPC ",0.,0.,-278.7,0,"ONLY");
1550 gMC->Gsord("TPMW",6);
1551 gMC->Gsord("TSSW",6);
1552 gMC->Gsord("TSWC",6);
1554 // put the TPC into ALIC (main mother volume)
1556 gMC->Gspos("TPC ",1,"ALIC",0.,0.,0.,0,"ONLY");
1559 } // end of function
1561 //_____________________________________________________________________________
1562 void AliTPCv3::DrawDetector()
1565 // Draw a shaded view of the Time Projection Chamber version 3
1569 // Set everything unseen
1570 gMC->Gsatt("*", "seen", -1);
1572 // Set ALIC mother transparent
1573 gMC->Gsatt("ALIC","SEEN",0);
1575 // Set the volumes visible
1578 gMC->Gsatt("TPC ","SEEN",0);
1579 gMC->Gsatt("TOIN","SEEN",1);
1580 gMC->Gsatt("TOIN","COLO",7);
1581 gMC->Gsatt("TOCV","SEEN",1);
1582 gMC->Gsatt("TOCV","COLO",4);
1583 gMC->Gsatt("TSA1","SEEN",0);
1584 gMC->Gsatt("TSA2","SEEN",0);
1585 gMC->Gsatt("TSA3","SEEN",0);
1586 gMC->Gsatt("TSA4","SEEN",0);
1587 gMC->Gsatt("TSA5","SEEN",0);
1588 gMC->Gsatt("TOFC","SEEN",1);
1589 gMC->Gsatt("TOFC","COLO",4);
1590 gMC->Gsatt("TSA6","SEEN",0);
1591 gMC->Gsatt("TSA7","SEEN",0);
1592 gMC->Gsatt("TSA8","SEEN",0);
1593 gMC->Gsatt("TIIN","SEEN",1);
1594 gMC->Gsatt("TIIN","COLO",7);
1595 gMC->Gsatt("TII1","SEEN",0);
1596 gMC->Gsatt("TIFC","SEEN",1);
1597 gMC->Gsatt("TIFC","COLO",4);
1598 gMC->Gsatt("TSA9","SEEN",0);
1599 gMC->Gsatt("TS10","SEEN",0);
1600 gMC->Gsatt("TS11","SEEN",0);
1601 gMC->Gsatt("TS12","SEEN",0);
1602 gMC->Gsatt("TS13","SEEN",0);
1603 gMC->Gsatt("TS14","SEEN",0);
1604 gMC->Gsatt("TICC","SEEN",0);
1605 gMC->Gsatt("TICM","SEEN",0);
1606 gMC->Gsatt("TS15","SEEN",0);
1607 gMC->Gsatt("TS16","SEEN",0);
1608 gMC->Gsatt("TS17","SEEN",0);
1609 gMC->Gsatt("TS18","SEEN",0);
1610 gMC->Gsatt("TS19","SEEN",0);
1611 gMC->Gsatt("TPJ1","SEEN",0);
1612 gMC->Gsatt("TPJ2","SEEN",0);
1613 gMC->Gsatt("TICS","SEEN",0);
1614 gMC->Gsatt("TDGS","SEEN",0);
1615 gMC->Gsatt("TIRC","SEEN",0);
1616 gMC->Gsatt("TIC1","SEEN",1);
1617 gMC->Gsatt("TIPP","SEEN",0);
1618 gMC->Gsatt("TIC3","SEEN",0);
1619 gMC->Gsatt("TRCE","SEEN",0);
1620 gMC->Gsatt("TPSC","SEEN",0);
1621 gMC->Gsatt("TPCC","SEEN",0);
1622 gMC->Gsatt("TORC","SEEN",0);
1623 gMC->Gsatt("TOPP","SEEN",0);
1624 gMC->Gsatt("TOC3","SEEN",0);
1625 gMC->Gsatt("TOC1","SEEN",1);
1626 gMC->Gsatt("TSSW","SEEN",1);
1627 gMC->Gsatt("TSWC","SEEN",1);
1628 gMC->Gsatt("TSSW","COLO",3);
1629 gMC->Gsatt("TSWC","COLO",3);
1630 gMC->Gsatt("TSCE","COLO",6);
1631 gMC->Gsatt("TSCE","SEEN",1);
1632 gMC->Gsatt("TWES","SEEN",0);
1633 gMC->Gsatt("TSWB","SEEN",0);
1634 gMC->Gsatt("TPEL","SEEN",0);
1635 gMC->Gsatt("TPMW","SEEN",1);
1636 gMC->Gsatt("TESR","SEEN",1);
1637 gMC->Gsatt("TPMW","COLO",12);
1638 gMC->Gsatt("TIC1","COLO",5);
1639 gMC->Gsatt("TOC1","COLO",5);
1640 gMC->Gsatt("TESB","SEEN",0);
1641 gMC->Gsatt("THVM","SEEN",1);
1642 gMC->Gsatt("THVM","COLO",11);
1643 gMC->Gsatt("THVH","SEEN",0);
1644 gMC->Gsatt("TPSR","SEEN",0);
1645 gMC->Gsatt("THVL","SEEN",0);
1646 gMC->Gsatt("THVC","SEEN",0);
1647 gMC->Gsatt("THVE","SEEN",0);
1648 gMC->Gsatt("THVR","SEEN",0);
1651 gMC->Gdopt("hide", "on");
1652 gMC->Gdopt("shad", "on");
1653 gMC->Gsatt("*", "fill", 7);
1654 gMC->SetClipBox(".");
1655 gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1656 gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1657 gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1658 gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1659 gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1660 gMC->DefaultRange();
1661 gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1662 gMC->Gdhead(1111, "Time Projection Chamber");
1663 gMC->Gdman(18, 4, "MAN");
1664 gMC->Gdopt("hide","off");
1667 //_____________________________________________________________________________
1668 void AliTPCv3::CreateMaterials()
1671 // Define materials for version 2 of the Time Projection Chamber
1676 AliTPC::CreateMaterials();
1679 //_____________________________________________________________________________
1680 void AliTPCv3::Init()
1683 // Initialises version 3 of the TPC after that it has been built
1685 Int_t *idtmed = fIdtmed->GetArray();
1689 fIdSens=gMC->VolId("TDGS"); // drift gas as a sensitive volume
1691 gMC->SetMaxNStep(30000); // max. number of steps increased
1693 gMC->Gstpar(idtmed[2],"LOSS",5);
1695 printf("%s: *** TPC version 3 initialized***\n",ClassName());
1697 printf("%s: Maximum number of steps = %d\n",ClassName(),gMC->GetMaxNStep());
1699 // printf("*** TPC version 3 initialized ***\n");
1700 // printf("Maximum number of steps = %d\n",gMC->GetMaxNStep());
1706 //_____________________________________________________________________________
1707 void AliTPCv3::StepManager()
1710 // Called for every step in the Time Projection Chamber
1714 // parameters used for the energy loss calculations
1716 const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1717 const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1718 const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
1721 const Float_t kbig = 1.e10;
1733 gMC->SetMaxStep(kbig);
1735 if(!gMC->IsTrackAlive()) return; // particle has disappeared
1737 Float_t charge = gMC->TrackCharge();
1739 if(TMath::Abs(charge)<=0.) return; // take only charged particles
1742 id=gMC->CurrentVolID(copy);
1744 // Check the sensitive volume
1746 if (id != fIdSens) return;
1749 // charged particle is in the sensitive volume
1752 if(gMC->TrackStep() > 0) {
1755 Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1756 nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
1758 gMC->TrackPosition(pos);
1764 // check the selected side of the TPC
1767 if(fSide && fSide*hits[2]<=0.) return;
1769 hits[3]=(Float_t)nel;
1773 AddHit(gAlice->CurrentTrack(), vol,hits); //MI change
1777 // Stemax calculation for the next step
1781 gMC->TrackMomentum(mom);
1782 Float_t ptot=mom.Rho();
1783 Float_t betaGamma = ptot/gMC->TrackMass();
1785 Int_t pid=gMC->TrackPid();
1786 if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1788 pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1792 betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3);
1793 pp=kprim*BetheBloch(betaGamma);
1794 if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
1798 gMC->Rndm(random,1); // good, old GRNDM from Geant3
1800 Double_t rnd = (Double_t)random[0];
1802 gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1806 //_____________________________________________________________________________
1807 Float_t AliTPCv3::BetheBloch(Float_t bg)
1810 // Bethe-Bloch energy loss formula
1812 const Double_t kp1=0.76176e-1;
1813 const Double_t kp2=10.632;
1814 const Double_t kp3=0.13279e-4;
1815 const Double_t kp4=1.8631;
1816 const Double_t kp5=1.9479;
1818 Double_t dbg = (Double_t) bg;
1820 Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
1822 Double_t aa = TMath::Power(beta,kp4);
1823 Double_t bb = TMath::Power(1./dbg,kp5);
1825 bb=TMath::Log(kp3+bb);
1827 return ((Float_t)((kp2-aa-bb)*kp1/aa));