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 **************************************************************************/
19 ///////////////////////////////////////////////////////////////////////////////
21 // Time Projection Chamber version 3 -- detailed TPC and slow simulation //
25 <img src="picts/AliTPCv3Class.gif">
30 ///////////////////////////////////////////////////////////////////////////////
34 #include <TInterpreter.h>
35 #include <TLorentzVector.h>
37 #include <TVirtualMC.h>
42 #include "AliTPCDigitsArray.h"
43 #include "AliTPCParam.h"
44 #include "AliTPCParamSR.h"
45 #include "AliTPCTrackHitsV2.h"
50 //_____________________________________________________________________________
58 //_____________________________________________________________________________
59 AliTPCv3::AliTPCv3(const char *name, const char *title) :
63 // Standard constructor for Time Projection Chamber version 3
66 SetBufferSize(128000);
69 SetGasMixt(2,20,10,-1,0.9,0.1,0.);
72 fTPCParam->Write(fTPCParam->GetTitle());
77 //_____________________________________________________________________________
78 void AliTPCv3::CreateGeometry()
81 // Creation of the TPC coarse geometry (version 3)
82 // The whole drift volume is sensitive
83 // Origin Marek Kowalski Cracow
87 <img src="picts/AliTPCgif">
92 <img src="picts/AliTPCv3Tree.gif">
97 Int_t *idtmed = fIdtmed->GetArray(); // TPC media
99 Int_t idrotm[120]; // rotation matrices
101 Int_t nRotMat = 0; // actual number of rotation matrices
105 // Mother volume (Air) - all volumes will be positioned in it
160 gMC->Gsvolu("TPC ","PCON",idtmed[0],dm,27);
164 //-------------------------------------------------------------------
165 // Tpc Outer INsulator (CO2) - contains cont. vessel and field cage
166 //-------------------------------------------------------------------
208 gMC->Gsvolu("TOIN","PCON",idtmed[3],dm,21);
210 //----------------------------------------------------------------
211 // Tpc Outer Contaiment Vessel
212 // mother volume - Al, daughters - composite (sandwich)
213 //----------------------------------------------------------------
255 gMC->Gsvolu("TOCV","PCON",idtmed[4],dm,21);
257 // Daughter volumes - sandwich
259 // Tpc SAndwich 1 - Al
265 gMC->Gsvolu("TSA1","TUBE",idtmed[4],dm,3);
267 // Tpc SAndwich 2 - epoxy glue (I use Lexan)
272 gMC->Gsvolu("TSA2","TUBE",idtmed[14],dm,3);
274 // Tpc SAndwich 3 - Tedlar
279 gMC->Gsvolu("TSA3","TUBE",idtmed[9],dm,3);
282 // Tpc SAndwich 4 - fiber glass (G10)
287 gMC->Gsvolu("TSA4","TUBE",idtmed[12],dm,3);
289 // Tpc SAndwich 5 - NOMEX honeycomb
294 gMC->Gsvolu("TSA5","TUBE",idtmed[6],dm,3);
296 // 5->4->3->2->1->TCOV
299 gMC->Gspos("TSA5",1,"TSA4",0.,0.,0.,0,"ONLY");
300 gMC->Gspos("TSA4",1,"TSA3",0.,0.,0.,0,"ONLY");
301 gMC->Gspos("TSA3",1,"TSA2",0.,0.,0.,0,"ONLY");
302 gMC->Gspos("TSA2",1,"TSA1",0.,0.,0.,0,"ONLY");
304 gMC->Gspos("TSA1",1,"TOCV",0.,0.,3.,0,"ONLY");
308 gMC->Gspos("TOCV",1,"TOIN",0.,0.,0.,0,"ONLY");
310 //-------------------------------------------------------
311 // Tpc Outer Field Cage
312 // mother volume - Al, daughters - composite (sandwich)
313 //-------------------------------------------------------
355 gMC->Gsvolu("TOFC","PCON",idtmed[4],dm,21);
359 // Tpc SAndwich 6 - Tedlar
365 gMC->Gsvolu("TSA6","TUBE",idtmed[9],dm,3);
367 // Tpc SAndwich 7 - fiber glass
372 gMC->Gsvolu("TSA7","TUBE",idtmed[12],dm,3);
375 // Tpc SAndwich 8 - NOMEX
380 gMC->Gsvolu("TSA8","TUBE",idtmed[6],dm,3);
384 gMC->Gspos("TSA8",1,"TSA7",0.,0.,0.,0,"ONLY");
385 gMC->Gspos("TSA7",1,"TSA6",0.,0.,0.,0,"ONLY");
386 gMC->Gspos("TSA6",1,"TOFC",0.,0.,0.,0,"ONLY");
390 gMC->Gspos("TOFC",1,"TOIN",0.,0.,0.,0,"ONLY");
394 gMC->Gspos("TOIN",1,"TPC ",0.,0.,0.,0,"ONLY");
398 //--------------------------------------------------------------------
399 // Tpc Inner INsulator (CO2) - inner f.c. will be placed there
400 // Inner containment vessel will be placed directly in the TPC
401 //--------------------------------------------------------------------
431 gMC->Gsvolu("TIIN","PCON",idtmed[3],dm,15);
433 // the middle part of the F.C. is thinner - carve out the strip - Ne-CO2
439 gMC->Gsvolu("TII1","TUBE",idtmed[1],dm,3);
441 gMC->Gspos("TII1",1,"TIIN",0.,0.,0.,0,"ONLY");
443 //-----------------------------------------------------
444 // Tpc Inner Field Cage
445 // mother volume - Al, daughters - composite (sandwich)
446 //------------------------------------------------------
512 gMC->Gsvolu("TIFC","PCON",idtmed[4],dm,33);
514 // daughter volumes - central part
516 // Tpc Sandwich 9 -Tedlar
522 gMC->Gsvolu("TSA9","TUBE",idtmed[9],dm,3);
524 // Tpc Sandwich 10 - fiber glass (G10)
529 gMC->Gsvolu("TS10","TUBE",idtmed[12],dm,3);
531 // Tpc Sandwich 11 - NOMEX
536 gMC->Gsvolu("TS11","TUBE",idtmed[6],dm,3);
540 gMC->Gspos("TS11",1,"TS10",0.,0.,0.,0,"ONLY");
541 gMC->Gspos("TS10",1,"TSA9",0.,0.,0.,0,"ONLY");
543 gMC->Gspos("TSA9",1,"TIFC",0.,0.,0.,0,"ONLY");
545 // daughter volumes - outer parts (reinforced)
547 // Tpc Sandwich 12 -Tedlar
553 gMC->Gsvolu("TS12","TUBE",idtmed[9],dm,3);
555 // Tpc Sandwich 13 - fiber glass (G10)
560 gMC->Gsvolu("TS13","TUBE",idtmed[12],dm,3);
562 // Tpc Sandwich 14 - NOMEX
567 gMC->Gsvolu("TS14","TUBE",idtmed[6],dm,3);
571 gMC->Gspos("TS14",1,"TS13",0.,0.,0.,0,"ONLY");
572 gMC->Gspos("TS13",1,"TS12",0.,0.,0.,0,"ONLY");
574 gMC->Gspos("TS12",1,"TIFC",0.,0.,170.05,0,"ONLY");
575 gMC->Gspos("TS12",2,"TIFC",0.,0.,-170.05,0,"ONLY");
577 // place this inside the inner insulator
579 gMC->Gspos("TIFC",1,"TIIN",0.,0.,0.,0,"ONLY");
581 // and now in the TPC...
583 gMC->Gspos("TIIN",1,"TPC ",0.,0.,0.,0,"ONLY");
585 //---------------------------------------------------------
586 // Tpc Inner Containment vessel - Cones
587 //---------------------------------------------------------
641 gMC->Gsvolu("TICC","PCON",idtmed[4],dm,27);
643 Float_t phi1,phi2,phi3,theta1,theta2,theta3; // rotation angles
654 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
656 gMC->Gspos("TICC",1,"TPC ",0.,0.,0.,0,"ONLY");
657 gMC->Gspos("TICC",2,"TPC ",0.,0.,0.,idrotm[nRotMat],"ONLY");
660 //---------------------------------------------------------
661 // Tpc Inner Containment vessel - Middle part -Al
662 //---------------------------------------------------------
704 gMC->Gsvolu("TICM","PCON",idtmed[4],dm,21);
706 // Tpc Sandwich 15 - Al
712 gMC->Gsvolu("TS15","TUBE",idtmed[4],dm,3);
714 // Tpc Sandwich 16 - epoxy glue
719 gMC->Gsvolu("TS16","TUBE",idtmed[14],dm,3);
721 // Tpc Sandwich 17 - Tedlar
726 gMC->Gsvolu("TS17","TUBE",idtmed[9],dm,3);
728 // Tpc Sandwich 18 - carbon fiber
733 gMC->Gsvolu("TS18","TUBE",idtmed[15],dm,3);
735 // Tpc Sandwich 19 - Nomex
740 gMC->Gsvolu("TS19","TUBE",idtmed[6],dm,3);
742 // 19->18->17->16->15-> TICM
744 gMC->Gspos("TS19",1,"TS18",0.,0.,0.,0,"ONLY");
745 gMC->Gspos("TS18",1,"TS17",0.,0.,0.,0,"ONLY");
746 gMC->Gspos("TS17",1,"TS16",0.,0.,0.,0,"ONLY");
747 gMC->Gspos("TS16",1,"TS15",0.,0.,0.,0,"ONLY");
749 gMC->Gspos("TS15",1,"TICM ",0.,0.,0.,0,"ONLY");
752 // TPc inner cont. vessel Joints
758 gMC->Gsvolu("TPJ1","TUBE",idtmed[4],dm,3);
760 gMC->Gspos("TPJ1",1,"TPC ",0.,0.,72.3,0,"ONLY");
761 gMC->Gspos("TPJ1",2,"TPC ",0.,0.,-72.3,0,"ONLY");
793 gMC->Gsvolu("TPJ2","PCON",idtmed[4],dm,15);
795 gMC->Gspos("TPJ2",1,"TPC ",0.,0.,0.,0,"ONLY");
796 gMC->Gspos("TPJ2",2,"TPC ",0.,0.,0.,idrotm[nRotMat],"ONLY");
800 // Tpc Inner Containment vessel Seal (Viton, I use Lexan for a time being)
806 gMC->Gsvolu("TICS","TUBE",idtmed[14],dm,3);
808 gMC->Gspos("TICS",1,"TPC ",0.,0.,71.7,0,"ONLY");
809 gMC->Gspos("TICS",2,"TPC ",0.,0.,-71.7,0,"ONLY");
813 gMC->Gspos("TICM",1,"TPC ",0.,0.,0.,0,"ONLY");
817 nRotMat++; // prepare for the next rotation matrix
819 //---------------------------------------------------------
820 // Tpc Dift Gas volume Nonsensitive (Ne-CO2 90/10)
821 // and its daughters (HV membrane, rods, readout chambers)
822 //---------------------------------------------------------
828 gMC->Gsvolu("TDGS","TUBE",idtmed[2],dm,3);
830 // sector opening angles
832 Float_t innerOpenAngle = fTPCParam->GetInnerAngle();
834 // sector angle shift
836 Float_t innerAngleShift = fTPCParam->GetInnerAngleShift();
840 Int_t nInnerSector = fTPCParam->GetNInnerSector()/2;
841 Int_t nOuterSector = fTPCParam->GetNOuterSector()/2;
843 // All above parameters are identical for inner and outer
844 // sectors. The distinction is kept for the historical reasons
845 // and eventually will disappear.
847 Float_t tanAlpha = TMath::Tan(0.5*innerOpenAngle);
848 Float_t cosAlpha = TMath::Sqrt(1.+tanAlpha*tanAlpha);
851 //-------------------------------------------------------------------------
852 // Tpc Inner Readout Chambers
853 //-------------------------------------------------------------------------
857 dm[2]= 1.6; // thickness
860 gMC->Gsvolu("TIRC","TRD1",idtmed[4],dm,4);
862 // this volume will be positioned in the empty space
863 // of the end-cap to avoid overlaps
870 gMC->Gsvolu("TIC1","TRD1",idtmed[4],dm,4);
873 //------------------------------------------------
874 // Tpc Inner readout chamber Pad Plane
875 //------------------------------------------------
882 gMC->Gsvolu("TIPP","TRD1",idtmed[12],dm,4);
886 dm[0] -= 1.218511934;
887 dm[1] -= 1.218511934;
890 gMC->Gsvolu("TIC3","TRD1",idtmed[1],dm,4);
892 gMC->Gspos("TIC3",1,"TIPP",0.,0.15,0.,0,"ONLY");
894 gMC->Gspos("TIPP",1,"TIRC",0.,1.1,0.,0,"ONLY");
897 //----------------------------------------------
898 // Tpc Readout Chambers Empty spaces - for both
899 // inner and outer sectors
900 //----------------------------------------------
902 gMC->Gsvolu("TRCE","TRD1",idtmed[0],dm,0);
904 // Inner sector - 4 spaces
915 space = rr*tanAlpha-dm[0];
917 for(Int_t nsLow=0;nsLow<4;nsLow++){
920 dm[1]= rr*tanAlpha - space;
924 gMC->Gsposp("TRCE",nsLow+1,"TIRC",0.,-0.8,zz,0,"ONLY",dm,4);
930 gMC->Gsposp("TRCE",nsLow+5,"TIC1",0.,1.05,zz-2.1,0,"ONLY",dm,4);
933 dm[0] = rr*tanAlpha - space;
939 // dm[1] - this is the dm[1] from the previous TRCE
943 gMC->Gsposp("TRCE",9,"TIC1",0.,-1.2,0.,0,"ONLY",dm,4);
946 // TPc Space for Connectors
953 gMC->Gsvolu("TPSC","BOX ",idtmed[0],dm,3);
961 gMC->Gsvolu("TPCC","BOX ",idtmed[13],dm,3);
963 gMC->Gspos("TPCC",1,"TPSC",0.,0.15,0.,0,"ONLY");
971 // inner part of the inner sector - 2 x 20 holes
973 astep = 20.00096874/19.;
975 alpha = 10.00048437-astep;
987 for(ncon=0;ncon<20;ncon++){
993 phi3 = (alpha>0) ? 0. : 180.;
994 theta3 = TMath::Abs(alpha);
996 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1000 gMC->Gspos("TPSC",ncon+1,"TIRC",x1,0.3,-12.7875,idrotm[nRotMat],"ONLY");
1001 gMC->Gspos("TPSC",ncon+21,"TIRC",x2,0.3,-2.8625,idrotm[nRotMat],"ONLY");
1012 // outer part of the inner sector - 2 x 25 holes
1014 astep = 20.00096874/24.;
1015 alpha = 10.00048437-astep;
1023 for(ncon=0;ncon<25;ncon++){
1029 phi3 = (alpha>0) ? 0. : 180.;
1030 theta3 = TMath::Abs(alpha);
1032 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1036 gMC->Gspos("TPSC",ncon+41,"TIRC",x1,0.3,7.0625,idrotm[nRotMat],"ONLY");
1037 gMC->Gspos("TPSC",ncon+66,"TIRC",x2,0.3,16.9875,idrotm[nRotMat],"ONLY");
1048 //--------------------------------------------------------------------------
1049 // TPC Outer Readout Chambers
1050 // this is NOT a final design
1051 //--------------------------------------------------------------------------
1055 dm[2]= 1.5; //thickness
1058 gMC->Gsvolu("TORC","TRD1",idtmed[4],dm,4);
1060 //------------------------------------------------
1061 // Tpc Outer readout chamber Pad Plane
1062 //------------------------------------------------
1066 gMC->Gsvolu("TOPP","TRD1",idtmed[12],dm,4);
1068 dm[0] -= 1.218511934;
1069 dm[1] -= 1.218511934;
1072 gMC->Gsvolu("TOC3","TRD1",idtmed[1],dm,4);
1074 gMC->Gspos("TOC3",1,"TOPP",0.,0.15,0.,0,"ONLY");
1076 gMC->Gspos("TOPP",1,"TORC",0.,1.0,0.,0,"ONLY");
1085 gMC->Gsposp("TRCE",10,"TORC",0.,-0.8,-2.15,0,"ONLY",dm,4);
1092 gMC->Gsvolu("TOC1","TRD1",idtmed[4],dm,4);
1099 gMC->Gsposp("TRCE",11,"TOC1",0.,0.,0.,0,"ONLY",dm,4);
1101 //-----------------------------------------------
1102 // Tpc Services Support Wheel
1103 //-----------------------------------------------
1118 gMC->Gsvolu("TSSW","PGON",idtmed[4],dm,10);
1120 // Tpc Services Wheel Cover
1125 gMC->Gsvolu("TSWC","PGON",idtmed[4],dm,10);
1127 // Tpc Service wheel Cover Empty space
1134 gMC->Gsvolu("TSCE","TRD1",idtmed[0],dm,4);
1136 // Tpc services Wheel Empty Spaces
1143 gMC->Gsvolu("TWES","TRD1",idtmed[0],dm,4);
1145 // Tpc Services Wheel Bars
1147 gMC->Gsvolu("TSWB","TRD1",idtmed[4],dm,0);
1157 gMC->Gsposp("TSWB",1,"TWES",0.,0.,-85.125,0,"ONLY",dm,4);
1162 gMC->Gsposp("TSWB",2,"TWES",0.,0.,85.125,0,"ONLY",dm,4);
1164 // TPc ELectronics - right now 30% X0 Si
1171 gMC->Gsvolu("TPEL","TRD1",idtmed[11],dm,4);
1172 gMC->Gspos("TPEL",1,"TWES",0.,0.,0.,0,"ONLY");
1174 //--------------------------------------------------------------------------
1176 //--------------------------------------------------------------------------
1178 // TPc Main Wheel - Al
1184 gMC->Gsvolu("TPMW","TUBE",idtmed[4],dm,3);
1186 //--------------------------------------------------------------------------
1187 // Tpc Empty Space for the Readout chambers
1188 //--------------------------------------------------------------------------
1192 Float_t dR = 0.5*(rUp-rLow);
1194 space= 1.5/cosAlpha; // wheel ribs are 3.0 cm wide
1196 dm[0]= rLow*tanAlpha-space;
1197 dm[1]= rUp*tanAlpha-space;
1201 gMC->Gsvolu("TESR","TRD1",idtmed[0],dm,4);
1205 gMC->Gspos("TIC1",1,"TESR",0.,0.75,-dR+23.97,0,"ONLY");
1209 gMC->Gspos("TOC1",1,"TESR",0.,0.75,dR-55.02,0,"ONLY");
1211 // Tpc Empty Space Bars - Al (daughters of TESR)
1215 gMC->Gsvolu("TESB","TRD1",idtmed[4],dm,0);
1219 dm[0]= rLow*tanAlpha-space;
1220 dm[1]= 88.7*tanAlpha-space;
1226 gMC->Gsposp("TESB",1,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1230 dm[0]= 131.65*tanAlpha-space;
1231 dm[1]= 136.5*tanAlpha-space;
1234 zBar = -dR +131.65+dm[3]-rLow;
1236 gMC->Gsposp("TESB",2,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1240 dm[0]= 240.4*tanAlpha-space;
1241 dm[1]= rUp*tanAlpha-space;
1246 gMC->Gsposp("TESB",3,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1248 // positioning of the empty spaces into the main wheel
1250 Float_t rCenter,xc,yc;
1251 Float_t rInner,rOuter; // center of the inner and outer chamber
1259 for(Int_t ns=0; ns<nInnerSector;ns++){
1261 phi1 = ns * innerOpenAngle + innerAngleShift;
1262 phi1 *= kRaddeg; // in degrees
1264 phi1 = (Float_t)TMath::Nint(phi1) + 270.;
1266 if (phi1 > 360.) phi1 -= 360.;
1271 phi3 = ns * innerOpenAngle + innerAngleShift;
1272 phi3 *= kRaddeg; // in degrees
1274 phi3 = (Float_t)TMath::Nint(phi3);
1276 if(phi3 > 360.) phi3 -= 360.;
1280 // "holes"->End plate
1282 xc = rCenter*TMath::Cos(phi3*kDegrad);
1283 yc = rCenter*TMath::Sin(phi3*kDegrad);
1285 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1287 gMC->Gspos("TESR",ns+1,"TPMW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1289 // TSCE->TSWC (services wheel volumes)
1291 xc = 166.142*TMath::Cos(phi3*kDegrad);
1292 yc = 166.142*TMath::Sin(phi3*kDegrad);
1294 gMC->Gspos("TSCE",ns+1,"TSWC",xc,yc,0.,idrotm[nRotMat],"ONLY");
1295 gMC->Gspos("TWES",ns+1,"TSSW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1298 // readout chambers->TDGS (drift gas)
1300 xc = rInner*TMath::Cos(phi3*kDegrad);
1301 yc = rInner*TMath::Sin(phi3*kDegrad);
1303 gMC->Gspos("TIRC",ns+1,"TDGS",xc,yc,252.,idrotm[nRotMat],"ONLY");
1305 xc = rOuter*TMath::Cos(phi3*kDegrad);
1306 yc = rOuter*TMath::Sin(phi3*kDegrad);
1308 gMC->Gspos("TORC",ns+1,"TDGS",xc,yc,252.1,idrotm[nRotMat],"ONLY");
1312 theta2 = 0.; // reflection
1314 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1316 xc = rInner*TMath::Cos(phi3*kDegrad);
1317 yc = rInner*TMath::Sin(phi3*kDegrad);
1319 gMC->Gspos("TIRC",ns+nInnerSector+1,"TDGS",xc,yc,-252.,idrotm[nRotMat],"ONLY");
1321 xc = rOuter*TMath::Cos(phi3*kDegrad);
1322 yc = rOuter*TMath::Sin(phi3*kDegrad);
1324 gMC->Gspos("TORC",ns+nOuterSector+1,"TDGS",xc,yc,-252.1,idrotm[nRotMat],"ONLY");
1331 gMC->Gspos("TPMW",1,"TPC ",0.,0.,256.6,0,"ONLY");
1332 gMC->Gspos("TPMW",2,"TPC ",0.,0.,-256.6,idrotm[0],"ONLY");
1334 //---------------------------------------------------------
1335 // Tpc High Voltage Membrane - 100 microns of mylar
1336 //---------------------------------------------------------
1342 gMC->Gsvolu("THVM","TUBE",idtmed[8],dm,3);
1344 gMC->Gspos("THVM",1,"TDGS",0.,0.,0.,0,"ONLY");
1346 // Tpc High Voltage membrane Holders
1348 gMC->Gsvolu("THVH","TUBE",idtmed[4],dm,0);
1358 gMC->Gsposp("THVH",1,"TDGS",0.,0.,0.,0,"ONLY",dm,3);
1366 gMC->Gsposp("THVH",2,"TDGS",0.,0.,0.,0,"ONLY",dm,3);
1368 //----------------------------------------------------------
1369 // TPc Support Rods - MAKROLON
1370 //----------------------------------------------------------
1375 gMC->Gsvolu("TPSR","TUBE",idtmed[7],dm,0); // inner and outer rods differ
1378 for(Int_t nrod=0;nrod<18;nrod++){
1379 Float_t angle=innerOpenAngle*(Float_t)nrod;
1381 xc=81.5*TMath::Cos(angle);
1382 yc=81.5*TMath::Sin(angle);
1386 gMC->Gsposp("TPSR",nrod+1,"TDGS",xc,yc,126.9,0,"ONLY",dm,3);
1387 gMC->Gsposp("TPSR",nrod+19,"TDGS",xc,yc,-126.9,0,"ONLY",dm,3);
1391 xc=254.25*TMath::Cos(angle);
1392 yc=254.25*TMath::Sin(angle);
1394 // rod number 54 contans the HV cable
1397 gMC->Gsposp("TPSR",nrod+37,"TDGS",xc,yc,127.,0,"ONLY",dm,3);
1398 gMC->Gsposp("TPSR",nrod+54,"TDGS",xc,yc,-127.,0,"ONLY",dm,3);
1403 //----------------------------------------------------------
1404 // Tpc High Voltage Rod - MAKROLON + Copper cable
1405 //----------------------------------------------------------
1407 // rod with cable (Left)
1413 gMC->Gsvolu("THVL","TUBE",idtmed[7],dm,3);
1421 gMC->Gsvolu("THVC","TUBE",idtmed[10],dm,3);
1429 gMC->Gsvolu("THVE","TUBE",idtmed[1],dm,3);
1431 gMC->Gspos("THVC",1,"THVL",0.,0.,0.,0,"ONLY");
1432 gMC->Gspos("THVE",1,"THVL",0.,0.,0.,0,"ONLY");
1434 // rod without cable
1440 gMC->Gsvolu("THVR","TUBE",idtmed[7],dm,3);
1442 gMC->Gspos("THVL",1,"TDGS",xc,yc,-127.,0,"ONLY");
1443 gMC->Gspos("THVR",1,"TDGS",xc,yc,127.,0,"ONLY");
1445 gMC->Gspos("TDGS",1,"TPC ",0.,0.,0.,0,"ONLY");
1447 // services wheel cover -> wheel
1450 gMC->Gspos("TSWC",1,"TSSW",0.,0.,4.5,0,"ONLY");
1451 gMC->Gspos("TSWC",2,"TSSW",0.,0.,-4.5,0,"ONLY");
1454 // put the wheel into the TPC
1456 gMC->Gspos("TSSW",1,"TPC ",0.,0.,278.7,0,"ONLY");
1457 gMC->Gspos("TSSW",2,"TPC ",0.,0.,-278.7,0,"ONLY");
1461 gMC->Gsord("TPMW",6);
1462 gMC->Gsord("TSSW",6);
1463 gMC->Gsord("TSWC",6);
1465 // put the TPC into ALIC (main mother volume)
1467 gMC->Gspos("TPC ",1,"ALIC",0.,0.,0.,0,"ONLY");
1470 } // end of function
1472 //_____________________________________________________________________________
1473 void AliTPCv3::DrawDetector()
1476 // Draw a shaded view of the Time Projection Chamber version 3
1480 // Set everything unseen
1481 gMC->Gsatt("*", "seen", -1);
1483 // Set ALIC mother transparent
1484 gMC->Gsatt("ALIC","SEEN",0);
1486 // Set the volumes visible
1489 gMC->Gsatt("TPC ","SEEN",0);
1490 gMC->Gsatt("TOIN","SEEN",1);
1491 gMC->Gsatt("TOIN","COLO",7);
1492 gMC->Gsatt("TOCV","SEEN",1);
1493 gMC->Gsatt("TOCV","COLO",4);
1494 gMC->Gsatt("TSA1","SEEN",0);
1495 gMC->Gsatt("TSA2","SEEN",0);
1496 gMC->Gsatt("TSA3","SEEN",0);
1497 gMC->Gsatt("TSA4","SEEN",0);
1498 gMC->Gsatt("TSA5","SEEN",0);
1499 gMC->Gsatt("TOFC","SEEN",1);
1500 gMC->Gsatt("TOFC","COLO",4);
1501 gMC->Gsatt("TSA6","SEEN",0);
1502 gMC->Gsatt("TSA7","SEEN",0);
1503 gMC->Gsatt("TSA8","SEEN",0);
1504 gMC->Gsatt("TIIN","SEEN",1);
1505 gMC->Gsatt("TIIN","COLO",7);
1506 gMC->Gsatt("TII1","SEEN",0);
1507 gMC->Gsatt("TIFC","SEEN",1);
1508 gMC->Gsatt("TIFC","COLO",4);
1509 gMC->Gsatt("TSA9","SEEN",0);
1510 gMC->Gsatt("TS10","SEEN",0);
1511 gMC->Gsatt("TS11","SEEN",0);
1512 gMC->Gsatt("TS12","SEEN",0);
1513 gMC->Gsatt("TS13","SEEN",0);
1514 gMC->Gsatt("TS14","SEEN",0);
1515 gMC->Gsatt("TICC","SEEN",0);
1516 gMC->Gsatt("TICM","SEEN",0);
1517 gMC->Gsatt("TS15","SEEN",0);
1518 gMC->Gsatt("TS16","SEEN",0);
1519 gMC->Gsatt("TS17","SEEN",0);
1520 gMC->Gsatt("TS18","SEEN",0);
1521 gMC->Gsatt("TS19","SEEN",0);
1522 gMC->Gsatt("TPJ1","SEEN",0);
1523 gMC->Gsatt("TPJ2","SEEN",0);
1524 gMC->Gsatt("TICS","SEEN",0);
1525 gMC->Gsatt("TDGS","SEEN",0);
1526 gMC->Gsatt("TIRC","SEEN",0);
1527 gMC->Gsatt("TIC1","SEEN",1);
1528 gMC->Gsatt("TIPP","SEEN",0);
1529 gMC->Gsatt("TIC3","SEEN",0);
1530 gMC->Gsatt("TRCE","SEEN",0);
1531 gMC->Gsatt("TPSC","SEEN",0);
1532 gMC->Gsatt("TPCC","SEEN",0);
1533 gMC->Gsatt("TORC","SEEN",0);
1534 gMC->Gsatt("TOPP","SEEN",0);
1535 gMC->Gsatt("TOC3","SEEN",0);
1536 gMC->Gsatt("TOC1","SEEN",1);
1537 gMC->Gsatt("TSSW","SEEN",1);
1538 gMC->Gsatt("TSWC","SEEN",1);
1539 gMC->Gsatt("TSSW","COLO",3);
1540 gMC->Gsatt("TSWC","COLO",3);
1541 gMC->Gsatt("TSCE","COLO",6);
1542 gMC->Gsatt("TSCE","SEEN",1);
1543 gMC->Gsatt("TWES","SEEN",0);
1544 gMC->Gsatt("TSWB","SEEN",0);
1545 gMC->Gsatt("TPEL","SEEN",0);
1546 gMC->Gsatt("TPMW","SEEN",1);
1547 gMC->Gsatt("TESR","SEEN",1);
1548 gMC->Gsatt("TPMW","COLO",12);
1549 gMC->Gsatt("TIC1","COLO",5);
1550 gMC->Gsatt("TOC1","COLO",5);
1551 gMC->Gsatt("TESB","SEEN",0);
1552 gMC->Gsatt("THVM","SEEN",1);
1553 gMC->Gsatt("THVM","COLO",11);
1554 gMC->Gsatt("THVH","SEEN",0);
1555 gMC->Gsatt("TPSR","SEEN",0);
1556 gMC->Gsatt("THVL","SEEN",0);
1557 gMC->Gsatt("THVC","SEEN",0);
1558 gMC->Gsatt("THVE","SEEN",0);
1559 gMC->Gsatt("THVR","SEEN",0);
1562 gMC->Gdopt("hide", "on");
1563 gMC->Gdopt("shad", "on");
1564 gMC->Gsatt("*", "fill", 7);
1565 gMC->SetClipBox(".");
1566 gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1567 gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1568 gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1569 gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1570 gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1571 gMC->DefaultRange();
1572 gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1573 gMC->Gdhead(1111, "Time Projection Chamber");
1574 gMC->Gdman(18, 4, "MAN");
1575 gMC->Gdopt("hide","off");
1578 //_____________________________________________________________________________
1579 void AliTPCv3::CreateMaterials()
1582 // Define materials for version 2 of the Time Projection Chamber
1587 AliTPC::CreateMaterials();
1590 //_____________________________________________________________________________
1591 void AliTPCv3::Init()
1594 // Initialises version 3 of the TPC after that it has been built
1596 Int_t *idtmed = fIdtmed->GetArray();
1600 fIdSens=gMC->VolId("TDGS"); // drift gas as a sensitive volume
1602 gMC->SetMaxNStep(30000); // max. number of steps increased
1604 gMC->Gstpar(idtmed[2],"LOSS",5);
1606 printf("%s: *** TPC version 3 initialized***\n",ClassName());
1608 printf("%s: Maximum number of steps = %d\n",ClassName(),gMC->GetMaxNStep());
1610 // printf("*** TPC version 3 initialized ***\n");
1611 // printf("Maximum number of steps = %d\n",gMC->GetMaxNStep());
1617 //_____________________________________________________________________________
1618 void AliTPCv3::StepManager()
1621 // Called for every step in the Time Projection Chamber
1625 // parameters used for the energy loss calculations
1627 const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1628 const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1629 const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
1632 const Float_t kbig = 1.e10;
1644 gMC->SetMaxStep(kbig);
1646 if(!gMC->IsTrackAlive()) return; // particle has disappeared
1648 Float_t charge = gMC->TrackCharge();
1650 if(TMath::Abs(charge)<=0.) return; // take only charged particles
1653 id=gMC->CurrentVolID(copy);
1655 // Check the sensitive volume
1657 if (id != fIdSens) return;
1660 // charged particle is in the sensitive volume
1663 if(gMC->TrackStep() > 0) {
1666 Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1667 nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
1669 gMC->TrackPosition(pos);
1675 // check the selected side of the TPC
1678 if(fSide && fSide*hits[2]<=0.) return;
1680 hits[3]=(Float_t)nel;
1684 AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits); //MI change
1688 // Stemax calculation for the next step
1692 gMC->TrackMomentum(mom);
1693 Float_t ptot=mom.Rho();
1694 Float_t betaGamma = ptot/gMC->TrackMass();
1696 Int_t pid=gMC->TrackPid();
1697 if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1699 pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1703 betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3);
1704 pp=kprim*BetheBloch(betaGamma);
1705 if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
1708 Double_t rnd = gMC->GetRandom()->Rndm();
1710 gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1714 //_____________________________________________________________________________
1715 Float_t AliTPCv3::BetheBloch(Float_t bg)
1718 // Bethe-Bloch energy loss formula
1720 const Double_t kp1=0.76176e-1;
1721 const Double_t kp2=10.632;
1722 const Double_t kp3=0.13279e-4;
1723 const Double_t kp4=1.8631;
1724 const Double_t kp5=1.9479;
1726 Double_t dbg = (Double_t) bg;
1728 Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
1730 Double_t aa = TMath::Power(beta,kp4);
1731 Double_t bb = TMath::Power(1./dbg,kp5);
1733 bb=TMath::Log(kp3+bb);
1735 return ((Float_t)((kp2-aa-bb)*kp1/aa));