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 2 -- detailed TPC and slow simulation //
25 <img src="picts/AliTPCv2Class.gif">
30 ///////////////////////////////////////////////////////////////////////////////
34 #include <TLorentzVector.h>
36 #include <TVirtualMC.h>
41 #include "AliTPCDigitsArray.h"
42 #include "AliTPCParam.h"
43 #include "AliTPCParamSR.h"
44 #include "AliTPCTrackHitsV2.h"
50 //_____________________________________________________________________________
51 AliTPCv2::AliTPCv2(const char *name, const char *title) :
55 // Standard constructor for Time Projection Chamber version 2
61 SetBufferSize(128000);
63 SetGasMixt(2,20,10,-1,0.9,0.1,0.); // Ne-CO2 90-10
69 SetSecLows(1, 2, 3, 19, 20, 21);
70 SetSecUps(37, 38, 39, 37+18, 38+18, 39+18, -1, -1, -1, -1, -1, -1);
71 SetSens(1); // sensitive strips set
74 fTPCParam->Write(fTPCParam->GetTitle());
77 //_____________________________________________________________________________
78 void AliTPCv2::CreateGeometry()
81 // Create the geometry of Time Projection Chamber version 2
85 <img src="picts/AliTPC.gif">
90 <img src="picts/AliTPCv2Tree.gif">
95 Int_t *idtmed = fIdtmed->GetArray();
106 Int_t nInnerSector = fTPCParam->GetNInnerSector()/2;
107 Int_t nOuterSector = fTPCParam->GetNOuterSector()/2;
109 // ---------------------------------------------------
110 // sector specification check
111 // ---------------------------------------------------
115 for (i = 0; i < 6; ++i) {
116 if (fSecLows[i] >= 0 && fSecLows[i] < 2*nInnerSector) {
118 printf("%s: *** SECTOR %d selected\n",ClassName(),fSecLows[i]);
123 printf("%s: *** ALL LOWER SECTORS SELECTED ***\n",ClassName());
128 printf("%s: *** ERROR: AT LEAST ONE LOWER SECTOR MUST BE SPECIFIED ***\n",ClassName());
129 printf("%s: !!! PROGRAM STOPPED !!!\n",ClassName());
135 for (i = 0; i < 12; ++i) {
136 if (fSecUps[i] > 2*nInnerSector-1 &&
137 fSecUps[i] < 2*(nInnerSector+nOuterSector)) {
138 printf("%s: *** SECTOR %d selected\n",ClassName(),fSecUps[i]);
143 printf("%s: *** ALL UPPER SECTORS SELECTED ***\n",ClassName());
148 //--------------------------------------------------------------------
151 // Mother volume TPC (Air) - all volumes will be positioned in it
206 gMC->Gsvolu("TPC ","PCON",idtmed[0],dm,27);
210 //-------------------------------------------------------------------
211 // Tpc Outer INsulator (CO2) - contains cont. vessel and field cage
212 //-------------------------------------------------------------------
254 gMC->Gsvolu("TOIN","PCON",idtmed[3],dm,21);
256 //----------------------------------------------------------------
257 // Tpc Outer Contaiment Vessel
258 // mother volume - Al, daughters - composite (sandwich)
259 //----------------------------------------------------------------
301 gMC->Gsvolu("TOCV","PCON",idtmed[4],dm,21);
303 // Daughter volumes - sandwich
305 // Tpc SAndwich 1 - Al
311 gMC->Gsvolu("TSA1","TUBE",idtmed[4],dm,3);
313 // Tpc SAndwich 2 - epoxy glue (I use Lexan)
318 gMC->Gsvolu("TSA2","TUBE",idtmed[14],dm,3);
320 // Tpc SAndwich 3 - Tedlar
325 gMC->Gsvolu("TSA3","TUBE",idtmed[9],dm,3);
328 // Tpc SAndwich 4 - fiber glass (G10)
333 gMC->Gsvolu("TSA4","TUBE",idtmed[12],dm,3);
335 // Tpc SAndwich 5 - NOMEX honeycomb
340 gMC->Gsvolu("TSA5","TUBE",idtmed[6],dm,3);
342 // 5->4->3->2->1->TCOV
345 gMC->Gspos("TSA5",1,"TSA4",0.,0.,0.,0,"ONLY");
346 gMC->Gspos("TSA4",1,"TSA3",0.,0.,0.,0,"ONLY");
347 gMC->Gspos("TSA3",1,"TSA2",0.,0.,0.,0,"ONLY");
348 gMC->Gspos("TSA2",1,"TSA1",0.,0.,0.,0,"ONLY");
350 gMC->Gspos("TSA1",1,"TOCV",0.,0.,3.,0,"ONLY");
354 gMC->Gspos("TOCV",1,"TOIN",0.,0.,0.,0,"ONLY");
356 //-------------------------------------------------------
357 // Tpc Outer Field Cage
358 // mother volume - Al, daughters - composite (sandwich)
359 //-------------------------------------------------------
401 gMC->Gsvolu("TOFC","PCON",idtmed[4],dm,21);
405 // Tpc SAndwich 6 - Tedlar
411 gMC->Gsvolu("TSA6","TUBE",idtmed[9],dm,3);
413 // Tpc SAndwich 7 - fiber glass
418 gMC->Gsvolu("TSA7","TUBE",idtmed[12],dm,3);
421 // Tpc SAndwich 8 - NOMEX
426 gMC->Gsvolu("TSA8","TUBE",idtmed[6],dm,3);
430 gMC->Gspos("TSA8",1,"TSA7",0.,0.,0.,0,"ONLY");
431 gMC->Gspos("TSA7",1,"TSA6",0.,0.,0.,0,"ONLY");
432 gMC->Gspos("TSA6",1,"TOFC",0.,0.,0.,0,"ONLY");
435 // TOFC overlaps with
437 gMC->Gspos("TOFC",1,"TOIN",0.,0.,0.,0,"ONLY");
441 gMC->Gspos("TOIN",1,"TPC ",0.,0.,0.,0,"ONLY");
445 //--------------------------------------------------------------------
446 // Tpc Inner INsulator (CO2) - inner f.c. will be placed there
447 // Inner containment vessel will be placed directly in the TPC
448 //--------------------------------------------------------------------
478 gMC->Gsvolu("TIIN","PCON",idtmed[3],dm,15);
480 // the middle part of the F.C. is thinner - carve out the strip - Ne-CO2
486 gMC->Gsvolu("TII1","TUBE",idtmed[1],dm,3);
488 gMC->Gspos("TII1",1,"TIIN",0.,0.,0.,0,"ONLY");
490 //-----------------------------------------------------
491 // Tpc Inner Field Cage
492 // mother volume - Al, daughters - composite (sandwich)
493 //------------------------------------------------------
559 gMC->Gsvolu("TIFC","PCON",idtmed[4],dm,33);
561 // daughter volumes - central part
563 // Tpc Sandwich 9 -Tedlar
569 gMC->Gsvolu("TSA9","TUBE",idtmed[9],dm,3);
571 // Tpc Sandwich 10 - fiber glass (G10)
576 gMC->Gsvolu("TS10","TUBE",idtmed[12],dm,3);
578 // Tpc Sandwich 11 - NOMEX
583 gMC->Gsvolu("TS11","TUBE",idtmed[6],dm,3);
587 gMC->Gspos("TS11",1,"TS10",0.,0.,0.,0,"ONLY");
588 gMC->Gspos("TS10",1,"TSA9",0.,0.,0.,0,"ONLY");
590 gMC->Gspos("TSA9",1,"TIFC",0.,0.,0.,0,"ONLY");
592 // daughter volumes - outer parts (reinforced)
594 // Tpc Sandwich 12 -Tedlar
600 gMC->Gsvolu("TS12","TUBE",idtmed[9],dm,3);
602 // Tpc Sandwich 13 - fiber glass (G10)
607 gMC->Gsvolu("TS13","TUBE",idtmed[12],dm,3);
609 // Tpc Sandwich 14 - NOMEX
614 gMC->Gsvolu("TS14","TUBE",idtmed[6],dm,3);
618 gMC->Gspos("TS14",1,"TS13",0.,0.,0.,0,"ONLY");
619 gMC->Gspos("TS13",1,"TS12",0.,0.,0.,0,"ONLY");
621 gMC->Gspos("TS12",1,"TIFC",0.,0.,170.05,0,"ONLY");
622 gMC->Gspos("TS12",2,"TIFC",0.,0.,-170.05,0,"ONLY");
624 // place this inside the inner insulator
626 gMC->Gspos("TIFC",1,"TIIN",0.,0.,0.,0,"ONLY");
628 // and now in the TPC...
630 gMC->Gspos("TIIN",1,"TPC ",0.,0.,0.,0,"ONLY");
632 //---------------------------------------------------------
633 // Tpc Inner Containment vessel - Cones
634 //---------------------------------------------------------
688 gMC->Gsvolu("TICC","PCON",idtmed[4],dm,27);
690 Float_t phi1,phi2,phi3,theta1,theta2,theta3; // rotation angles
701 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
703 gMC->Gspos("TICC",1,"TPC ",0.,0.,0.,0,"ONLY");
704 gMC->Gspos("TICC",2,"TPC ",0.,0.,0.,idrotm[nRotMat],"ONLY");
707 //---------------------------------------------------------
708 // Tpc Inner Containment vessel - Middle part -Al
709 //---------------------------------------------------------
751 gMC->Gsvolu("TICM","PCON",idtmed[4],dm,21);
753 // Tpc Sandwich 15 - Al
759 gMC->Gsvolu("TS15","TUBE",idtmed[4],dm,3);
761 // Tpc Sandwich 16 - epoxy glue
766 gMC->Gsvolu("TS16","TUBE",idtmed[14],dm,3);
768 // Tpc Sandwich 17 - Tedlar
773 gMC->Gsvolu("TS17","TUBE",idtmed[9],dm,3);
775 // Tpc Sandwich 18 - carbon fiber
780 gMC->Gsvolu("TS18","TUBE",idtmed[15],dm,3);
782 // Tpc Sandwich 19 - Nomex
787 gMC->Gsvolu("TS19","TUBE",idtmed[6],dm,3);
789 // 19->18->17->16->15-> TICM
791 gMC->Gspos("TS19",1,"TS18",0.,0.,0.,0,"ONLY");
792 gMC->Gspos("TS18",1,"TS17",0.,0.,0.,0,"ONLY");
793 gMC->Gspos("TS17",1,"TS16",0.,0.,0.,0,"ONLY");
794 gMC->Gspos("TS16",1,"TS15",0.,0.,0.,0,"ONLY");
796 gMC->Gspos("TS15",1,"TICM ",0.,0.,0.,0,"ONLY");
799 // TPc inner cont. vessel Joints
805 gMC->Gsvolu("TPJ1","TUBE",idtmed[4],dm,3);
807 gMC->Gspos("TPJ1",1,"TPC ",0.,0.,72.3,0,"ONLY");
808 gMC->Gspos("TPJ1",2,"TPC ",0.,0.,-72.3,0,"ONLY");
840 gMC->Gsvolu("TPJ2","PCON",idtmed[4],dm,15);
842 gMC->Gspos("TPJ2",1,"TPC ",0.,0.,0.,0,"ONLY");
843 gMC->Gspos("TPJ2",2,"TPC ",0.,0.,0.,idrotm[nRotMat],"ONLY");
847 // Tpc Inner Containment vessel Seal (Viton, I use Lexan for a time being)
853 gMC->Gsvolu("TICS","TUBE",idtmed[14],dm,3);
855 gMC->Gspos("TICS",1,"TPC ",0.,0.,71.7,0,"ONLY");
856 gMC->Gspos("TICS",2,"TPC ",0.,0.,-71.7,0,"ONLY");
860 gMC->Gspos("TICM",1,"TPC ",0.,0.,0.,0,"ONLY");
864 nRotMat++; // prepare for the next rotation matrix
866 //---------------------------------------------------------
867 // Tpc Dift Gas volume Nonsensitive (Ne-CO2 90/10)
868 // and its daughters (HV membrane, rods, readout chambers)
869 //---------------------------------------------------------
875 gMC->Gsvolu("TDGN","TUBE",idtmed[1],dm,3);
877 // sector opening angles
879 Float_t innerOpenAngle = fTPCParam->GetInnerAngle();
880 Float_t outerOpenAngle = fTPCParam->GetOuterAngle();
882 // sector angle shift
884 Float_t innerAngleShift = fTPCParam->GetInnerAngleShift();
887 // All above parameters are identical for inner and outer
888 // sectors. The distinction is kept for the historical reasons
889 // and eventually will disappear.
891 Float_t tanAlpha = TMath::Tan(0.5*innerOpenAngle);
892 Float_t cosAlpha = TMath::Sqrt(1.+tanAlpha*tanAlpha);
895 //-------------------------------------------------------------------------
896 // Tpc Inner Readout Chambers
897 //-------------------------------------------------------------------------
901 dm[2]= 1.6; // thickness
904 gMC->Gsvolu("TIRC","TRD1",idtmed[4],dm,4);
906 // this volume will be positioned in the empty space
907 // of the end-cap to avoid overlaps
914 gMC->Gsvolu("TIC1","TRD1",idtmed[4],dm,4);
917 //------------------------------------------------
918 // Tpc Inner readout chamber Pad Plane
919 //------------------------------------------------
926 gMC->Gsvolu("TIPP","TRD1",idtmed[12],dm,4);
930 dm[0] -= 1.218511934;
931 dm[1] -= 1.218511934;
934 gMC->Gsvolu("TIC3","TRD1",idtmed[1],dm,4);
936 gMC->Gspos("TIC3",1,"TIPP",0.,0.15,0.,0,"ONLY");
938 gMC->Gspos("TIPP",1,"TIRC",0.,1.1,0.,0,"ONLY");
941 //----------------------------------------------
942 // Tpc Readout Chambers Empty spaces - for both
943 // inner and outer sectors
944 //----------------------------------------------
946 gMC->Gsvolu("TRCE","TRD1",idtmed[0],dm,0);
948 // Inner sector - 4 spaces
959 space = rr*tanAlpha-dm[0];
961 for(Int_t nsLow=0;nsLow<4;nsLow++){
964 dm[1]= rr*tanAlpha - space;
968 gMC->Gsposp("TRCE",nsLow+1,"TIRC",0.,-0.8,zz,0,"ONLY",dm,4);
974 gMC->Gsposp("TRCE",nsLow+5,"TIC1",0.,1.05,zz-2.1,0,"ONLY",dm,4);
977 dm[0] = rr*tanAlpha - space;
983 // dm[1] - this is the dm[1] from the previous TRCE
987 gMC->Gsposp("TRCE",9,"TIC1",0.,-1.2,0.,0,"ONLY",dm,4);
990 // TPc Space for Connectors
997 gMC->Gsvolu("TPSC","BOX ",idtmed[0],dm,3);
1005 gMC->Gsvolu("TPCC","BOX ",idtmed[13],dm,3);
1007 gMC->Gspos("TPCC",1,"TPSC",0.,0.15,0.,0,"ONLY");
1015 // inner part of the inner sector - 2 x 20 holes
1017 astep = 20.00096874/19.;
1019 alpha = 10.00048437-astep;
1031 for(ncon=0;ncon<20;ncon++){
1037 phi3 = (alpha>0) ? 0. : 180.;
1038 theta3 = TMath::Abs(alpha);
1040 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1044 gMC->Gspos("TPSC",ncon+1,"TIRC",x1,0.3,-12.7875,idrotm[nRotMat],"ONLY");
1045 gMC->Gspos("TPSC",ncon+21,"TIRC",x2,0.3,-2.8625,idrotm[nRotMat],"ONLY");
1056 // outer part of the inner sector - 2 x 25 holes
1058 astep = 20.00096874/24.;
1059 alpha = 10.00048437-astep;
1067 for(ncon=0;ncon<25;ncon++){
1073 phi3 = (alpha>0) ? 0. : 180.;
1074 theta3 = TMath::Abs(alpha);
1076 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1080 gMC->Gspos("TPSC",ncon+41,"TIRC",x1,0.3,7.0625,idrotm[nRotMat],"ONLY");
1081 gMC->Gspos("TPSC",ncon+66,"TIRC",x2,0.3,16.9875,idrotm[nRotMat],"ONLY");
1092 //--------------------------------------------------------------------------
1093 // TPC Outer Readout Chambers
1094 // this is NOT a final design
1095 //--------------------------------------------------------------------------
1099 dm[2]= 1.5; //thickness
1102 gMC->Gsvolu("TORC","TRD1",idtmed[4],dm,4);
1104 //------------------------------------------------
1105 // Tpc Outer readout chamber Pad Plane
1106 //------------------------------------------------
1110 gMC->Gsvolu("TOPP","TRD1",idtmed[12],dm,4);
1112 dm[0] -= 1.218511934;
1113 dm[1] -= 1.218511934;
1116 gMC->Gsvolu("TOC3","TRD1",idtmed[1],dm,4);
1118 gMC->Gspos("TOC3",1,"TOPP",0.,0.15,0.,0,"ONLY");
1120 gMC->Gspos("TOPP",1,"TORC",0.,1.0,0.,0,"ONLY");
1129 gMC->Gsposp("TRCE",10,"TORC",0.,-0.8,-2.15,0,"ONLY",dm,4);
1136 gMC->Gsvolu("TOC1","TRD1",idtmed[4],dm,4);
1143 gMC->Gsposp("TRCE",11,"TOC1",0.,0.,0.,0,"ONLY",dm,4);
1145 //-----------------------------------------------
1146 // Tpc Services Support Wheel
1147 //-----------------------------------------------
1162 gMC->Gsvolu("TSSW","PGON",idtmed[4],dm,10);
1164 // Tpc Services Wheel Cover
1169 gMC->Gsvolu("TSWC","PGON",idtmed[4],dm,10);
1171 // Tpc Service wheel Cover Empty space
1178 gMC->Gsvolu("TSCE","TRD1",idtmed[0],dm,4);
1180 // Tpc services Wheel Empty Spaces
1187 gMC->Gsvolu("TWES","TRD1",idtmed[0],dm,4);
1189 // Tpc Services Wheel Bars
1191 gMC->Gsvolu("TSWB","TRD1",idtmed[4],dm,0);
1201 gMC->Gsposp("TSWB",1,"TWES",0.,0.,-85.125,0,"ONLY",dm,4);
1206 gMC->Gsposp("TSWB",2,"TWES",0.,0.,85.125,0,"ONLY",dm,4);
1208 // TPc ELectronics - right now 30% X0 Si
1215 gMC->Gsvolu("TPEL","TRD1",idtmed[11],dm,4);
1216 gMC->Gspos("TPEL",1,"TWES",0.,0.,0.,0,"ONLY");
1218 //--------------------------------------------------------------------------
1220 //--------------------------------------------------------------------------
1222 // TPc Main Wheel - Al
1228 gMC->Gsvolu("TPMW","TUBE",idtmed[4],dm,3);
1230 //--------------------------------------------------------------------------
1231 // Tpc Empty Space for the Readout chambers
1232 //--------------------------------------------------------------------------
1236 Float_t dR = 0.5*(rUp-rLow);
1238 space= 1.5/cosAlpha; // wheel ribs are 3.0 cm wide
1240 dm[0]= rLow*tanAlpha-space;
1241 dm[1]= rUp*tanAlpha-space;
1245 gMC->Gsvolu("TESR","TRD1",idtmed[0],dm,4);
1249 gMC->Gspos("TIC1",1,"TESR",0.,0.75,-dR+23.97,0,"ONLY");
1253 gMC->Gspos("TOC1",1,"TESR",0.,0.75,dR-55.02,0,"ONLY");
1255 // Tpc Empty Space Bars - Al (daughters of TESR)
1259 gMC->Gsvolu("TESB","TRD1",idtmed[4],dm,0);
1263 dm[0]= rLow*tanAlpha-space;
1264 dm[1]= 88.7*tanAlpha-space;
1270 gMC->Gsposp("TESB",1,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1274 dm[0]= 131.65*tanAlpha-space;
1275 dm[1]= 136.5*tanAlpha-space;
1278 zBar = -dR +131.65+dm[3]-rLow;
1280 gMC->Gsposp("TESB",2,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1284 dm[0]= 240.4*tanAlpha-space;
1285 dm[1]= rUp*tanAlpha-space;
1290 gMC->Gsposp("TESB",3,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1292 //------------------------------------------------------
1293 // TPc Lower "S" Sectors
1294 //------------------------------------------------------
1297 Float_t inSecLowEdge = fTPCParam->GetInnerRadiusLow();
1298 Float_t inSecUpEdge = fTPCParam->GetInnerRadiusUp();
1300 dm[0] = inSecLowEdge*TMath::Tan(0.5*innerOpenAngle)-0.01;
1301 dm[1] = inSecUpEdge*TMath::Tan(0.5*innerOpenAngle)-0.01;
1302 dm[2] = 0.5*(250. - 5.e-3);
1303 dm[3] = 0.5*(inSecUpEdge-inSecLowEdge);
1305 gMC->Gsvolu("TPLS", "TRD1", idtmed[2], dm, 4); // sensitive
1308 //----------------------------------------------------------
1309 // TPc Upper Sectors
1310 //----------------------------------------------------------
1312 Float_t ouSecLowEdge = fTPCParam->GetOuterRadiusLow();
1313 Float_t ouSecUpEdge = fTPCParam->GetOuterRadiusUp();
1315 dm[0] = ouSecLowEdge*TMath::Tan(0.5*outerOpenAngle)-0.01;
1316 dm[1] = ouSecUpEdge*TMath::Tan(0.5*outerOpenAngle)-0.01;
1317 dm[2] = 0.5*(250. - 5.e-3);
1318 dm[3] = 0.5*(ouSecUpEdge-ouSecLowEdge);
1320 gMC->Gsvolu("TPUS", "TRD1", idtmed[2], dm, 4); // sensitive
1326 gMC->Gsvolu("TPSS","TRD1",idtmed[2],dm,0); // sensitive
1328 Int_t nofStrips,nstr;
1330 Float_t stripThick = 0.01; // 100 microns
1336 // if all lower sectors selected define only 1 strip
1338 nofStrips=((fSecAL <0)||(fSecAL>=0 && fSens<0)) ? 1 : fTPCParam->GetNRowLow();
1339 deadSpace = fTPCParam->GetInnerWireMount();
1341 dm[2] = 0.5*(250. - 5.e-3);
1342 dm[3] = 0.5 * stripThick;
1344 for(nstr=0;nstr<nofStrips;nstr++){
1346 r1 = fTPCParam->GetPadRowRadiiLow(nstr);
1347 r2 = r1 + stripThick;
1348 dm[0] = r1 * TMath::Tan(0.5*innerOpenAngle) - deadSpace;
1349 dm[1] = r2 * TMath::Tan(0.5*innerOpenAngle) - deadSpace;
1350 zs = -inSecLowEdge -0.5*(inSecUpEdge-inSecLowEdge);
1354 gMC->Gsposp("TPSS", nstr+1, "TPLS", 0., 0., zs, 0, "ONLY", dm, 4);
1359 // strips only if several upper sectors selected end fSens > 0
1361 if(fSecAU >=0 && fSens >0){
1363 Int_t nsSave = nofStrips;
1367 nofStrips = fTPCParam->GetNRowUp();
1368 deadSpace = fTPCParam->GetOuterWireMount();
1370 dm[2] = 0.5*(250. - 5.e-3);
1371 dm[3] = 0.5 * stripThick;
1374 for(nstr=0;nstr<nofStrips;nstr++){
1376 r1 = fTPCParam->GetPadRowRadiiUp(nstr);
1377 r2 = r1 + stripThick;
1378 dm[0] = r1 * TMath::Tan(0.5*outerOpenAngle) - deadSpace;
1379 dm[1] = r2 * TMath::Tan(0.5*outerOpenAngle) - deadSpace;
1380 zs = -ouSecLowEdge -0.5*(ouSecUpEdge-ouSecLowEdge);
1384 gMC->Gsposp("TPSS", nstr+1+nsSave, "TPUS", 0., 0., zs, 0, "ONLY", dm, 4);
1390 //-------------------------------------------------------
1391 // positioning of the empty spaces into the main wheel
1392 // and readout chambers and sectors into the drift gas
1393 //-------------------------------------------------------
1395 Float_t rCenter,xc,yc;
1396 Float_t rInner,rOuter; // center of the inner and outer chamber
1404 for(Int_t ns=0; ns<nInnerSector;ns++){
1406 phi1 = ns * innerOpenAngle + innerAngleShift;
1407 phi1 *= kRaddeg; // in degrees
1409 phi1 = (Float_t)TMath::Nint(phi1) + 270.;
1411 if (phi1 > 360.) phi1 -= 360.;
1416 phi3 = ns * innerOpenAngle + innerAngleShift;
1417 phi3 *= kRaddeg; // in degrees
1419 phi3 = (Float_t)TMath::Nint(phi3);
1421 if(phi3 > 360.) phi3 -= 360.;
1425 // "holes"->End plate
1427 xc = rCenter*TMath::Cos(phi3*kDegrad);
1428 yc = rCenter*TMath::Sin(phi3*kDegrad);
1430 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1432 gMC->Gspos("TESR",ns+1,"TPMW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1434 // TSCE->TSWC (services wheel volumes)
1436 xc = 166.142*TMath::Cos(phi3*kDegrad);
1437 yc = 166.142*TMath::Sin(phi3*kDegrad);
1439 gMC->Gspos("TSCE",ns+1,"TSWC",xc,yc,0.,idrotm[nRotMat],"ONLY");
1440 gMC->Gspos("TWES",ns+1,"TSSW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1443 // readout chambers->TDGN (drift gas)
1445 xc = rInner*TMath::Cos(phi3*kDegrad);
1446 yc = rInner*TMath::Sin(phi3*kDegrad);
1448 gMC->Gspos("TIRC",ns+1,"TDGN",xc,yc,252.,idrotm[nRotMat],"ONLY");
1450 // here lower sectors
1454 // all lower sectors are positioned
1456 gMC->Gspos("TPLS",ns+1,"TDGN",xc,yc,125.0025,idrotm[nRotMat],"ONLY");
1458 Gspos("TPLS",ns+nInnerSector+1,"TDGN",xc,yc,-125.0025,idrotm[nRotMat],"ONLY");
1462 // only selected sectors are positioned (up to 6 sectors)
1464 for(Int_t sel=0;sel<6;sel++){
1466 if(fSecLows[sel] == ns){
1467 gMC->Gspos("TPLS",ns+1,"TDGN",xc,yc,125.0025,idrotm[nRotMat],"ONLY");
1469 else if(fSecLows[sel] == ns+nInnerSector){
1471 Gspos("TPLS",ns+nInnerSector+1,"TDGN",xc,yc,-125.0025,idrotm[nRotMat],"ONLY");
1474 } // lower sectors finished
1477 xc = rOuter*TMath::Cos(phi3*kDegrad);
1478 yc = rOuter*TMath::Sin(phi3*kDegrad);
1480 gMC->Gspos("TORC",ns+1,"TDGN",xc,yc,252.1,idrotm[nRotMat],"ONLY");
1482 // here upper sectors
1486 // all upper sectors
1488 gMC->Gspos("TPUS",ns+1,"TDGN",xc,yc,125.0025,idrotm[nRotMat],"ONLY");
1490 Gspos("TPUS",ns+nOuterSector+1,"TDGN",xc,yc,-125.0025,idrotm[nRotMat],"ONLY");
1494 // only selected sectors (up to 12)
1496 for(Int_t sel=0;sel<12;sel++){
1497 if(fSecUps[sel] == ns+2*nInnerSector){
1498 gMC->Gspos("TPUS",ns+1,"TDGN",xc,yc,125.0025,idrotm[nRotMat],"ONLY");
1500 else if(fSecUps[sel] == ns+2*nInnerSector+nOuterSector){
1502 Gspos("TPUS",ns+nOuterSector+1,"TDGN",xc,yc,-125.0025,idrotm[nRotMat],"ONLY");
1505 } // upper sectors finished
1510 theta2 = 0.; // reflection
1512 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1514 xc = rInner*TMath::Cos(phi3*kDegrad);
1515 yc = rInner*TMath::Sin(phi3*kDegrad);
1517 gMC->Gspos("TIRC",ns+nInnerSector+1,"TDGN",xc,yc,-252.,idrotm[nRotMat],"ONLY");
1519 xc = rOuter*TMath::Cos(phi3*kDegrad);
1520 yc = rOuter*TMath::Sin(phi3*kDegrad);
1522 gMC->Gspos("TORC",ns+nOuterSector+1,"TDGN",xc,yc,-252.1,idrotm[nRotMat],"ONLY");
1529 gMC->Gspos("TPMW",1,"TPC ",0.,0.,256.6,0,"ONLY");
1530 gMC->Gspos("TPMW",2,"TPC ",0.,0.,-256.6,idrotm[0],"ONLY");
1532 //---------------------------------------------------------
1533 // Tpc High Voltage Membrane - 100 microns of mylar
1534 //---------------------------------------------------------
1540 gMC->Gsvolu("THVM","TUBE",idtmed[8],dm,3);
1542 gMC->Gspos("THVM",1,"TDGN",0.,0.,0.,0,"ONLY");
1544 // Tpc High Voltage membrane Holders
1546 gMC->Gsvolu("THVH","TUBE",idtmed[4],dm,0);
1556 gMC->Gsposp("THVH",1,"TDGN",0.,0.,0.,0,"ONLY",dm,3);
1564 gMC->Gsposp("THVH",2,"TDGN",0.,0.,0.,0,"ONLY",dm,3);
1566 //----------------------------------------------------------
1567 // TPc Support Rods - MAKROLON
1568 //----------------------------------------------------------
1573 gMC->Gsvolu("TPSR","TUBE",idtmed[7],dm,0); // inner and outer rods differ
1576 for(Int_t nrod=0;nrod<18;nrod++){
1577 Float_t angle=innerOpenAngle*(Float_t)nrod;
1579 xc=81.5*TMath::Cos(angle);
1580 yc=81.5*TMath::Sin(angle);
1584 gMC->Gsposp("TPSR",nrod+1,"TDGN",xc,yc,126.9,0,"ONLY",dm,3);
1585 gMC->Gsposp("TPSR",nrod+19,"TDGN",xc,yc,-126.9,0,"ONLY",dm,3);
1589 xc=254.25*TMath::Cos(angle);
1590 yc=254.25*TMath::Sin(angle);
1592 // rod number 54 contans the HV cable
1595 gMC->Gsposp("TPSR",nrod+37,"TDGN",xc,yc,127.,0,"ONLY",dm,3);
1596 gMC->Gsposp("TPSR",nrod+54,"TDGN",xc,yc,-127.,0,"ONLY",dm,3);
1601 //----------------------------------------------------------
1602 // Tpc High Voltage Rod - MAKROLON + Copper cable
1603 //----------------------------------------------------------
1605 // rod with cable (Left)
1611 gMC->Gsvolu("THVL","TUBE",idtmed[7],dm,3);
1619 gMC->Gsvolu("THVC","TUBE",idtmed[10],dm,3);
1627 gMC->Gsvolu("THVE","TUBE",idtmed[1],dm,3);
1629 gMC->Gspos("THVC",1,"THVL",0.,0.,0.,0,"ONLY");
1630 gMC->Gspos("THVE",1,"THVL",0.,0.,0.,0,"ONLY");
1632 // rod without cable
1638 gMC->Gsvolu("THVR","TUBE",idtmed[7],dm,3);
1640 gMC->Gspos("THVL",1,"TDGN",xc,yc,-127.,0,"ONLY");
1641 gMC->Gspos("THVR",1,"TDGN",xc,yc,127.,0,"ONLY");
1643 gMC->Gspos("TDGN",1,"TPC ",0.,0.,0.,0,"ONLY");
1645 // services wheel cover -> wheel
1648 gMC->Gspos("TSWC",1,"TSSW",0.,0.,4.5,0,"ONLY");
1649 gMC->Gspos("TSWC",2,"TSSW",0.,0.,-4.5,0,"ONLY");
1652 // put the wheel into the TPC
1654 gMC->Gspos("TSSW",1,"TPC ",0.,0.,278.7,0,"ONLY");
1655 gMC->Gspos("TSSW",2,"TPC ",0.,0.,-278.7,0,"ONLY");
1659 gMC->Gsord("TPMW",6);
1660 gMC->Gsord("TSSW",6);
1661 gMC->Gsord("TSWC",6);
1662 if(fSecAL >=0) gMC->Gsord("TPLS",3);
1663 if(fSecAU >=0 && fSens >0) gMC->Gsord("TPUS",3);
1664 gMC->Gsord("TDGN",6);
1666 // put the TPC into ALIC (main mother volume)
1668 gMC->Gspos("TPC ",1,"ALIC",0.,0.,0.,0,"ONLY");
1672 } // end of function
1674 //_____________________________________________________________________________
1675 void AliTPCv2::DrawDetector()
1678 // Draw a shaded view of the Time Projection Chamber version 1
1681 // Set everything unseen
1682 gMC->Gsatt("*", "seen", -1);
1684 // Set ALIC mother transparent
1685 gMC->Gsatt("ALIC","SEEN",0);
1687 // Set the volumes visible
1690 gMC->Gsatt("TPC ","SEEN",0);
1691 gMC->Gsatt("TOIN","SEEN",1);
1692 gMC->Gsatt("TOIN","COLO",7);
1693 gMC->Gsatt("TOCV","SEEN",1);
1694 gMC->Gsatt("TOCV","COLO",4);
1695 gMC->Gsatt("TSA1","SEEN",0);
1696 gMC->Gsatt("TSA2","SEEN",0);
1697 gMC->Gsatt("TSA3","SEEN",0);
1698 gMC->Gsatt("TSA4","SEEN",0);
1699 gMC->Gsatt("TSA5","SEEN",0);
1700 gMC->Gsatt("TOFC","SEEN",1);
1701 gMC->Gsatt("TOFC","COLO",4);
1702 gMC->Gsatt("TSA6","SEEN",0);
1703 gMC->Gsatt("TSA7","SEEN",0);
1704 gMC->Gsatt("TSA8","SEEN",0);
1705 gMC->Gsatt("TIIN","SEEN",1);
1706 gMC->Gsatt("TIIN","COLO",7);
1707 gMC->Gsatt("TII1","SEEN",0);
1708 gMC->Gsatt("TIFC","SEEN",1);
1709 gMC->Gsatt("TIFC","COLO",4);
1710 gMC->Gsatt("TSA9","SEEN",0);
1711 gMC->Gsatt("TS10","SEEN",0);
1712 gMC->Gsatt("TS11","SEEN",0);
1713 gMC->Gsatt("TS12","SEEN",0);
1714 gMC->Gsatt("TS13","SEEN",0);
1715 gMC->Gsatt("TS14","SEEN",0);
1716 gMC->Gsatt("TICC","SEEN",0);
1717 gMC->Gsatt("TICM","SEEN",0);
1718 gMC->Gsatt("TS15","SEEN",0);
1719 gMC->Gsatt("TS16","SEEN",0);
1720 gMC->Gsatt("TS17","SEEN",0);
1721 gMC->Gsatt("TS18","SEEN",0);
1722 gMC->Gsatt("TS19","SEEN",0);
1723 gMC->Gsatt("TPJ1","SEEN",0);
1724 gMC->Gsatt("TPJ2","SEEN",0);
1725 gMC->Gsatt("TICS","SEEN",0);
1726 gMC->Gsatt("TDGN","SEEN",0);
1727 gMC->Gsatt("TIRC","SEEN",0);
1728 gMC->Gsatt("TIC1","SEEN",1);
1729 gMC->Gsatt("TIPP","SEEN",0);
1730 gMC->Gsatt("TIC3","SEEN",0);
1731 gMC->Gsatt("TRCE","SEEN",0);
1732 gMC->Gsatt("TPSC","SEEN",0);
1733 gMC->Gsatt("TPCC","SEEN",0);
1734 gMC->Gsatt("TORC","SEEN",0);
1735 gMC->Gsatt("TOPP","SEEN",0);
1736 gMC->Gsatt("TOC3","SEEN",0);
1737 gMC->Gsatt("TOC1","SEEN",1);
1738 gMC->Gsatt("TSSW","SEEN",1);
1739 gMC->Gsatt("TSWC","SEEN",1);
1740 gMC->Gsatt("TSSW","COLO",3);
1741 gMC->Gsatt("TSWC","COLO",3);
1742 gMC->Gsatt("TSCE","COLO",6);
1743 gMC->Gsatt("TSCE","SEEN",1);
1744 gMC->Gsatt("TWES","SEEN",0);
1745 gMC->Gsatt("TSWB","SEEN",0);
1746 gMC->Gsatt("TPEL","SEEN",0);
1747 gMC->Gsatt("TPMW","SEEN",1);
1748 gMC->Gsatt("TESR","SEEN",1);
1749 gMC->Gsatt("TPMW","COLO",12);
1750 gMC->Gsatt("TIC1","COLO",5);
1751 gMC->Gsatt("TOC1","COLO",5);
1752 gMC->Gsatt("TESB","SEEN",0);
1753 gMC->Gsatt("THVM","SEEN",1);
1754 gMC->Gsatt("THVM","COLO",11);
1755 gMC->Gsatt("THVH","SEEN",0);
1756 gMC->Gsatt("TPSR","SEEN",0);
1757 gMC->Gsatt("THVL","SEEN",0);
1758 gMC->Gsatt("THVC","SEEN",0);
1759 gMC->Gsatt("THVE","SEEN",0);
1760 gMC->Gsatt("THVR","SEEN",0);
1761 gMC->Gsatt("TPSS","SEEN",0);
1762 gMC->Gsatt("TPUS","SEEN",0);
1763 gMC->Gsatt("TPLS","SEEN",0);
1766 gMC->Gdopt("hide", "on");
1767 gMC->Gdopt("shad", "on");
1768 gMC->Gsatt("*", "fill", 7);
1769 gMC->SetClipBox(".");
1770 gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1771 gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1772 gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1773 gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1774 gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1775 gMC->DefaultRange();
1776 gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1777 gMC->Gdhead(1111, "Time Projection Chamber");
1778 gMC->Gdman(18, 4, "MAN");
1779 gMC->Gdopt("hide","off");
1782 //_____________________________________________________________________________
1783 void AliTPCv2::CreateMaterials()
1786 // Define materials for version 2 of the Time Projection Chamber
1789 AliTPC::CreateMaterials();
1792 //_____________________________________________________________________________
1793 void AliTPCv2::Init()
1796 // Initialises version 2 of the TPC after that it has been built
1799 Int_t *idtmed = fIdtmed->GetArray();
1805 fIdSens=gMC->VolId("TPSS");
1807 fIdLSec=gMC->VolId("TPLS"); // lower sector
1808 fIdUSec=gMC->VolId("TPUS"); // upper sector
1810 gMC->SetMaxNStep(30000); // max. number of steps increased
1812 gMC->Gstpar(idtmed[2],"LOSS",5); // specific energy loss
1814 printf("%s: *** TPC version 2 initialized ***\n",ClassName());
1815 printf("%s: Maximum number of steps = %d\n",ClassName(),gMC->GetMaxNStep());
1821 //_____________________________________________________________________________
1822 void AliTPCv2::StepManager()
1825 // Called for every step in the Time Projection Chamber
1829 // parameters used for the energy loss calculations
1831 const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1832 const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1833 const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
1836 const Float_t kbig = 1.e10;
1843 vol[1]=0; // preset row number to 0
1847 gMC->SetMaxStep(kbig);
1849 if(!gMC->IsTrackAlive()) return; // particle has disappeared
1851 Float_t charge = gMC->TrackCharge();
1853 if(TMath::Abs(charge)<=0.) return; // take only charged particles
1855 // check the sensitive volume
1857 id = gMC->CurrentVolID(copy); // current volume Id
1859 if ( (gMC->IsTrackEntering() || gMC->IsTrackExiting()) &&
1860 ((id == fIdLSec) || (id == fIdUSec)) ) {
1862 AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber());
1866 vol[0] = copy-1; // lower sector number
1868 else if(id == fIdUSec){
1869 vol[0] = copy+fTPCParam->GetNInnerSector()-1; // upper sector number
1871 else if(id == fIdSens && gMC->IsTrackEntering()){
1873 // track is entering the sensitive strip
1875 vol[1]= copy-1; // row number (absolute)
1879 id = gMC->CurrentVolOffID(1,copy);
1885 vol[0] = copy-1; // sector number
1892 vol[0] = copy-1+fTPCParam->GetNInnerSector(); // sector number
1893 vol[1] -= fTPCParam->GetNRowLow(); // row number (starts also from 0)
1899 // because Jouri wants to have this
1901 gMC->TrackMomentum(p);
1905 hits[3]=0.; // this hit has no energy loss
1906 // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->GetCurrentTrackNumber(),vol,hits);
1908 AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits); //MI change
1912 gMC->TrackPosition(p);
1916 hits[3]=0.; // this hit has no energy loss
1917 // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->GetCurrentTrackNumber(),vol,hits);
1919 AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits); //MI change
1924 //-----------------------------------------------------------------
1925 // charged particle is in the sensitive volume
1926 //-----------------------------------------------------------------
1928 if(gMC->TrackStep() > 0) {
1930 Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1931 nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
1933 gMC->TrackPosition(p);
1937 hits[3]=(Float_t)nel;
1941 // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->GetCurrentTrackNumber(),vol,hits);
1943 gMC->TrackMomentum(p);
1944 Float_t momentum = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
1945 Float_t precision = (momentum>0.1) ? 0.002 :0.01;
1946 fTrackHits->SetHitPrecision(precision);
1948 AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits); //MI change
1952 // Stemax calculation for the next step
1956 gMC->TrackMomentum(mom);
1957 Float_t ptot=mom.Rho();
1958 Float_t betaGamma = ptot/gMC->TrackMass();
1960 Int_t pid=gMC->TrackPid();
1961 if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1963 pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1968 betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3); // protection against too small bg
1969 pp=kprim*BetheBloch(betaGamma);
1971 if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
1974 Double_t rnd = gMC->GetRandom()->Rndm();
1976 gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1980 //_____________________________________________________________________________
1981 Float_t AliTPCv2::BetheBloch(Float_t bg)
1984 // Bethe-Bloch energy loss formula
1986 const Double_t kp1=0.76176e-1;
1987 const Double_t kp2=10.632;
1988 const Double_t kp3=0.13279e-4;
1989 const Double_t kp4=1.8631;
1990 const Double_t kp5=1.9479;
1992 Double_t dbg = (Double_t) bg;
1994 Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
1996 Double_t aa = TMath::Power(beta,kp4);
1997 Double_t bb = TMath::Power(1./dbg,kp5);
1999 bb=TMath::Log(kp3+bb);
2001 return ((Float_t)((kp2-aa-bb)*kp1/aa));