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 1.31 2000/11/30 11:48:50 kowal2
19 TLorentzVector.h adde to satisfy the latest changes by Federico
21 Revision 1.30 2000/11/14 10:48:57 kowal2
22 Correct material used for TSA4. Thanks to J. Barbosa.
24 Revision 1.29 2000/11/06 17:24:10 kowal2
25 Corrected bug in the outer containment vessel and
26 the outer field cage geometry.
29 Revision 1.28 2000/11/02 16:55:24 kowal2
30 Corrected bug in the inner containment vessel geometry.
33 Revision 1.27 2000/11/02 07:24:11 kowal2
34 Correction in the TPC geometry.
35 Changes due to the new hit structure.
37 Revision 1.26 2000/10/05 16:16:29 kowal2
38 Corrections of the hit recording algorithm.
40 Revision 1.25 2000/10/02 21:28:18 fca
41 Removal of useless dependecies via forward declarations
43 Revision 1.24 2000/08/28 10:02:30 kowal2
44 Corrected bug in the StepManager
46 Revision 1.23 2000/07/10 20:57:39 hristov
47 Update of TPC code and macros by M.Kowalski
49 Revision 1.22 2000/06/30 12:07:50 kowal2
50 Updated from the TPC-PreRelease branch
52 Revision 1.21.2.4 2000/06/26 07:39:42 kowal2
53 Changes to obey the coding rules
55 Revision 1.21.2.3 2000/06/25 08:38:41 kowal2
56 Splitted from AliTPCtracking
58 Revision 1.21.2.2 2000/06/16 12:58:13 kowal2
59 Changed parameter settings
61 Revision 1.21.2.1 2000/06/09 07:15:07 kowal2
63 Defaults loaded automatically (hard-wired)
64 Optional parameters can be set via macro called in the constructor
66 Revision 1.21 2000/05/15 10:00:30 kowal2
67 Corrected bug in the TPC geometry, thanks to Ivana Hrivnacova
69 Revision 1.20 2000/04/17 09:37:33 kowal2
70 removed obsolete AliTPCDigitsDisplay.C
72 Revision 1.19.8.2 2000/04/10 08:31:52 kowal2
74 Different geometry for different sectors
75 Updated readout chambers
76 Some modifications to StepManager by J.Belikov
78 Revision 1.19.8.1 2000/04/10 07:56:53 kowal2
79 Not used anymore - removed
81 Revision 1.19 1999/11/04 17:28:07 fca
82 Correct barrel part of HV Degrader
84 Revision 1.18 1999/10/14 16:52:08 fca
85 Only use PDG codes and not GEANT ones
87 Revision 1.17 1999/10/08 06:27:23 fca
88 Corrected bug in the HV degrader geometry, thanks to G.Tabary
90 Revision 1.16 1999/10/04 13:39:54 fca
91 Correct array index problem
93 Revision 1.15 1999/09/29 09:24:34 fca
94 Introduction of the Copyright and cvs Log
99 ///////////////////////////////////////////////////////////////////////////////
101 // Time Projection Chamber version 2 -- detailed TPC and slow simulation //
105 <img src="picts/AliTPCv2Class.gif">
110 ///////////////////////////////////////////////////////////////////////////////
115 #include "AliTPCv2.h"
116 #include "AliTPCDigitsArray.h"
119 #include "AliConst.h"
121 #include "AliTPCParam.h"
122 #include "AliTPCParamSR.h"
123 #include "AliTPCTrackHits.h"
124 #include "TLorentzVector.h"
129 //_____________________________________________________________________________
130 AliTPCv2::AliTPCv2(const char *name, const char *title) :
134 // Standard constructor for Time Projection Chamber version 2
140 SetBufferSize(128000);
142 SetGasMixt(2,20,10,-1,0.9,0.1,0.); // Ne-CO2 90-10
148 SetSecLows(1, 2, 3, 19, 20, 21);
149 SetSecUps(37, 38, 39, 37+18, 38+18, 39+18, -1, -1, -1, -1, -1, -1);
150 SetSens(1); // sensitive strips set
153 fTPCParam->Write(fTPCParam->GetTitle());
156 //_____________________________________________________________________________
157 void AliTPCv2::CreateGeometry()
160 // Create the geometry of Time Projection Chamber version 2
164 <img src="picts/AliTPC.gif">
169 <img src="picts/AliTPCv2Tree.gif">
174 Int_t *idtmed = fIdtmed->GetArray();
185 Int_t nInnerSector = fTPCParam->GetNInnerSector()/2;
186 Int_t nOuterSector = fTPCParam->GetNOuterSector()/2;
188 // ---------------------------------------------------
189 // sector specification check
190 // ---------------------------------------------------
194 for (i = 0; i < 6; ++i) {
195 if (fSecLows[i] >= 0 && fSecLows[i] < 2*nInnerSector) {
197 printf("*** SECTOR %d selected\n",fSecLows[i]);
202 printf("*** ALL LOWER SECTORS SELECTED ***\n");
207 printf("*** ERROR: AT LEAST ONE LOWER SECTOR MUST BE SPECIFIED ***\n");
208 printf("!!! PROGRAM STOPPED !!!\n");
214 for (i = 0; i < 12; ++i) {
215 if (fSecUps[i] > 2*nInnerSector-1 &&
216 fSecUps[i] < 2*(nInnerSector+nOuterSector)) {
217 printf("*** SECTOR %d selected\n",fSecUps[i]);
222 printf("*** ALL UPPER SECTORS SELECTED ***\n");
227 //--------------------------------------------------------------------
230 // Mother volume (Air) - all volumes will be positioned in it
310 gMC->Gsvolu("TPC ","PCON",idtmed[0],dm,39);
313 //-------------------------------------------------------------------
314 // Tpc Outer INsulator (CO2)
315 //-------------------------------------------------------------------
354 gMC->Gsvolu("TOIN","PCON",idtmed[3],dm,21);
356 //---------------------------------------------------------------
357 // shreds (G10) - TPC Rings
358 //---------------------------------------------------------------
360 gMC->Gsvolu("TPCR","TUBE",idtmed[12],dm,0);
366 gMC->Gsposp("TPCR",1,"TOIN",0.,0.,-253.3,0,"ONLY",dm,3); // left bottom
374 gMC->Gsposp("TPCR",2,"TOIN",0.,0.,253.3,0,"ONLY",dm,3); // right
382 gMC->Gsposp("TPCR",3,"TOIN",0.,0.,-250.7,0,"ONLY",dm,3); // left top
384 //----------------------------------------------------------------
385 // Tpc Outer Contaiment Vessel
386 // mother volume - Al, daughters - composite (sandwich)
387 //----------------------------------------------------------------
427 gMC->Gsvolu("TOCV","PCON",idtmed[4],dm,21);
431 // Tpc SAndwich 1 - Al
437 gMC->Gsvolu("TSA1","TUBE",idtmed[4],dm,3);
439 // Tpc SAndwich 2 - Tedlar
444 gMC->Gsvolu("TSA2","TUBE",idtmed[9],dm,3);
446 // Tpc SAndwich 3 - Kevlar
451 gMC->Gsvolu("TSA3","TUBE",idtmed[5],dm,3);
453 // Tpc SAndwich 4 - NOMEX honeycomb
458 gMC->Gsvolu("TSA4","TUBE",idtmed[6],dm,3);
462 gMC->Gspos("TSA4",1,"TSA3",0.,0.,0.,0,"ONLY");
463 gMC->Gspos("TSA3",1,"TSA2",0.,0.,0.,0,"ONLY");
464 gMC->Gspos("TSA2",1,"TSA1",0.,0.,0.,0,"ONLY");
466 gMC->Gspos("TSA1",1,"TOCV",0.,0.,2.6,0,"ONLY");
470 gMC->Gspos("TOCV",1,"TOIN",0.,0.,0.,0,"ONLY");
472 //-------------------------------------------------------
473 // Tpc Outer Field Cage
474 // mother volume - Al, daughters - composite (sandwich)
475 //-------------------------------------------------------
515 gMC->Gsvolu("TOFC","PCON",idtmed[4],dm,21);
519 // Tpc SAndwich 5 - Tedlar
525 gMC->Gsvolu("TSA5","TUBE",idtmed[9],dm,3);
527 // Tpc SAndwich 6 - Kevlar
532 gMC->Gsvolu("TSA6","TUBE",idtmed[5],dm,3);
535 // Tpc SAndwich 8 - NOMEX
540 gMC->Gsvolu("TSA7","TUBE",idtmed[6],dm,3);
544 gMC->Gspos("TSA7",1,"TSA6",0.,0.,0.,0,"ONLY");
545 gMC->Gspos("TSA6",1,"TSA5",0.,0.,0.,0,"ONLY");
547 gMC->Gspos("TSA5",1,"TOFC",0.,0.,0.,0,"ONLY");
551 gMC->Gspos("TOFC",1,"TOIN",0.,0.,0.,0,"ONLY");
555 gMC->Gspos("TOIN",1,"TPC ",0.,0.,0.,0,"ONLY");
557 //--------------------------------------------------------------------
558 // Tpc Inner INsulator (CO2)
559 //--------------------------------------------------------------------
574 Float_t tanL = (66.2-59.0)/(255.6-73.3); // tangent of the left cone part
577 dm[7]= 59.0+ (253.6-73.3)*tanL;
658 gMC->Gsvolu("TIIN","PCON",idtmed[3],dm,48);
661 //--------------------------------------------------------------------
662 // Tpc Inner Containment vessel, Left part
663 // mother volume - Al, daughter - composite (sandwich)
664 //--------------------------------------------------------------------
678 Float_t cosL = 1./TMath::Sqrt(1.+tanL*tanL);
679 Float_t sandThick = 2.14; // cone composite thickness
685 dm[7]= 59.0 + (253.6-73.3)*tanL;
692 dm[11]= dm[7]+sandThick/cosL;
697 dm[13]= 59.0+(75.6-73.3)*tanL;
698 dm[14]= dm[13]+sandThick/cosL;
724 gMC->Gsvolu("TICL","PCON",idtmed[4],dm,27);
728 // Tpc SAndwich 9 - Al
737 dm[4]= 59.0+(254.3-73.3)*tanL;
738 dm[5]= dm[4]+sandThick/cosL;
743 dm[7]= 59.0+(78.3-73.3)*tanL;
744 dm[8]= dm[7]+sandThick/cosL;
748 gMC->Gsvolu("TSA9","PCON",idtmed[4],dm,9);
750 // Tpc SAndwich 10 - Tedlar
760 gMC->Gsvolu("TS10","PCON",idtmed[9],dm,9);
762 // Tpc SAndwich 11 - Kevlar
772 gMC->Gsvolu("TS11","PCON",idtmed[5],dm,9);
774 // Tpc SAndwich 12 - NOMEX
784 gMC->Gsvolu("TS12","PCON",idtmed[6],dm,9);
788 gMC->Gspos("TS12",1,"TS11",0.,0.,0.,0,"ONLY");
789 gMC->Gspos("TS11",1,"TS10",0.,0.,0.,0,"ONLY");
790 gMC->Gspos("TS10",1,"TSA9",0.,0.,0.,0,"ONLY");
794 gMC->Gspos("TSA9",1,"TICL",0.,0.,0.,0,"ONLY");
796 //--------------------------------------------------------------------
797 // Tpc Inner Containment vessel, Right part
798 // mother volume - Al, daughter - composite (sandwich)
799 //--------------------------------------------------------------------
825 Float_t tanR = (66.0-59.0)/(250.5-73.3); // to avoid accuracy problems
826 Float_t cosR = 1./TMath::Sqrt(1.+tanR*tanR); //as above
831 dm[13]= 59.0+(75.6-73.3)*tanR;
838 dm[17]= dm[16]+sandThick/cosR;
843 dm[19]= 59.0+(248.4-73.3)*tanR;
844 dm[20]= dm[19]+sandThick/cosR;
858 gMC->Gsvolu("TICR","PCON",idtmed[4],dm,27);
864 // Tpc SAndwich 13 - Al
873 dm[4]= 59.0+(78.3-73.3)*tanR;
874 dm[5]= dm[4]+sandThick/cosR;
879 dm[7]= 59.0+(249.1-73.3)*tanR;
880 dm[8]= dm[7]+sandThick/cosR;
884 gMC->Gsvolu("TS13","PCON",idtmed[4],dm,9);
886 // Tpc SAndwich 14 - Tedlar
896 gMC->Gsvolu("TS14","PCON",idtmed[9],dm,9);
898 // Tpc SAndwich 15 - Kevlar
908 gMC->Gsvolu("TS15","PCON",idtmed[5],dm,9);
910 // Tpc SAndwich 16 - NOMEX
920 gMC->Gsvolu("TS16","PCON",idtmed[6],dm,9);
924 gMC->Gspos("TS16",1,"TS15",0.,0.,0.,0,"ONLY");
925 gMC->Gspos("TS15",1,"TS14",0.,0.,0.,0,"ONLY");
926 gMC->Gspos("TS14",1,"TS13",0.,0.,0.,0,"ONLY");
930 gMC->Gspos("TS13",1,"TICR",0.,0.,0.,0,"ONLY");
932 //------------------------------------------------------
933 // Tpc Inner Field Cage
934 // mother volume - Al, daughters - composite (sandwich)
935 //------------------------------------------------------
977 gMC->Gsvolu("TIFC","PCON",idtmed[4],dm,21);
981 // Tpc Sandwich 17 - Tedlar
987 gMC->Gsvolu("TS17","TUBE",idtmed[9],dm,3);
989 // Tpc Sandwich 18 - Kevlar
994 gMC->Gsvolu("TS18","TUBE",idtmed[5],dm,3);
997 // Tpc Sandwich 19 - NOMEX
1002 gMC->Gsvolu("TS19","TUBE",idtmed[6],dm,3);
1006 gMC->Gspos("TS19",1,"TS18",0.,0.,0.,0,"ONLY");
1007 gMC->Gspos("TS18",1,"TS17",0.,0.,0.,0,"ONLY");
1011 gMC->Gspos("TS17",1,"TIFC",0.,0.,0.,0,"ONLY");
1019 gMC->Gsposp("TPCR",4,"TIIN",0.,0.,-253.3,0,"ONLY",dm,3);
1024 gMC->Gsposp("TPCR",5,"TIIN",0.,0.,250.7,0,"ONLY",dm,3);
1029 gMC->Gsposp("TPCR",6,"TIIN",0.,0.,253.3,0,"ONLY",dm,3);
1033 gMC->Gspos("TICL",1,"TIIN",0.,0.,0.,0,"ONLY");
1037 gMC->Gspos("TICR",1,"TIIN",0.,0.,0.,0,"ONLY");
1041 gMC->Gspos("TIFC",1,"TIIN",0.,0.,0.,0,"ONLY");
1043 // Tpc Sandwich 21 - Al (central barrel)
1049 gMC->Gsvolu("TS21","TUBE",idtmed[4],dm,3);
1051 // Tpc Sandwich 22 - Tedlar (central barrel)
1056 gMC->Gsvolu("TS22","TUBE",idtmed[9],dm,3);
1058 // Tpc Sandwich 23 - Kevlar (central barrel)
1063 gMC->Gsvolu("TS23","TUBE",idtmed[5],dm,3);
1065 // Tpc Sandwich 24 - NOMEX (central barrel)
1070 gMC->Gsvolu("TS24","TUBE",idtmed[6],dm,3);
1074 gMC->Gspos("TS24",1,"TS23",0.,0.,0.,0,"ONLY");
1075 gMC->Gspos("TS23",1,"TS22",0.,0.,0.,0,"ONLY");
1076 gMC->Gspos("TS22",1,"TS21",0.,0.,0.,0,"ONLY");
1078 gMC->Gspos("TS21",1,"TIIN",0.,0.,0.,0,"ONLY");
1080 // put everything into the TPC
1082 gMC->Gspos("TIIN",1,"TPC ",0.,0.,0.,0,"ONLY");
1085 //---------------------------------------------------------
1086 // Tpc Dift Gas volume Nonsensitive (Ne-CO2 90/10)
1087 // and its daughters (HV membrane, rods, readout chambers)
1088 //---------------------------------------------------------
1094 gMC->Gsvolu("TDGN","TUBE",idtmed[1],dm,3); // nonsensitive
1096 // sector opening angles
1098 Float_t innerOpenAngle = fTPCParam->GetInnerAngle();
1099 Float_t outerOpenAngle = fTPCParam->GetOuterAngle();
1101 // sector angle shift
1103 Float_t innerAngleShift = fTPCParam->GetInnerAngleShift();
1105 // All above parameters are identical for inner and outer
1106 // sectors. The distinction is kept for the historical reasons
1107 // and eventually will disappear.
1109 Float_t tanAlpha = TMath::Tan(0.5*innerOpenAngle);
1110 Float_t cosAlpha = TMath::Sqrt(1.+tanAlpha*tanAlpha);
1113 //-------------------------------------------------------------------------
1114 // Tpc Inner Readout Chambers
1115 //-------------------------------------------------------------------------
1119 dm[2]= 1.6; // thickness
1122 gMC->Gsvolu("TIRC","TRD1",idtmed[4],dm,4);
1124 // this volume will be positioned in the empty space
1125 // of the end-cap to avoid overlaps
1132 gMC->Gsvolu("TIC1","TRD1",idtmed[4],dm,4);
1134 //------------------------------------------------
1135 // Tpc Inner readout chamber Pad Plane
1136 //------------------------------------------------
1143 gMC->Gsvolu("TIPP","TRD1",idtmed[12],dm,4);
1147 dm[0] -= 1.218511934;
1148 dm[1] -= 1.218511934;
1151 gMC->Gsvolu("TIC3","TRD1",idtmed[1],dm,4);
1153 gMC->Gspos("TIC3",1,"TIPP",0.,0.15,0.,0,"ONLY");
1155 gMC->Gspos("TIPP",1,"TIRC",0.,1.1,0.,0,"ONLY");
1157 //----------------------------------------------
1158 // Tpc Readout Chambers Empty spaces - for both
1159 // inner and outer sectors
1160 //----------------------------------------------
1162 gMC->Gsvolu("TRCE","TRD1",idtmed[0],dm,0);
1164 // Inner sector - 4 spaces
1175 space = rr*tanAlpha-dm[0];
1177 for(Int_t nsLow=0;nsLow<4;nsLow++){
1180 dm[1]= rr*tanAlpha - space;
1184 gMC->Gsposp("TRCE",nsLow+1,"TIRC",0.,-0.8,zz,0,"ONLY",dm,4);
1190 gMC->Gsposp("TRCE",nsLow+5,"TIC1",0.,1.05,zz-2.1,0,"ONLY",dm,4);
1193 dm[0] = rr*tanAlpha - space;
1199 // dm[1] - this is the dm[1] from the previous TRCE
1203 gMC->Gsposp("TRCE",9,"TIC1",0.,-1.2,0.,0,"ONLY",dm,4);
1206 // TPc Space for Connectors
1213 gMC->Gsvolu("TPSC","BOX ",idtmed[0],dm,3);
1221 gMC->Gsvolu("TPCC","BOX ",idtmed[13],dm,3);
1223 gMC->Gspos("TPCC",1,"TPSC",0.,0.15,0.,0,"ONLY");
1230 Float_t phi1,phi2,phi3,theta1,theta2,theta3; // rotation angles
1232 // inner part of the inner sector - 2 x 20 holes
1234 astep = 20.00096874/19.;
1236 alpha = 10.00048437-astep;
1248 for(ncon=0;ncon<20;ncon++){
1254 phi3 = (alpha>0) ? 0. : 180.;
1255 theta3 = TMath::Abs(alpha);
1257 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1261 gMC->Gspos("TPSC",ncon+1,"TIRC",x1,0.3,-12.7875,idrotm[nRotMat],"ONLY");
1262 gMC->Gspos("TPSC",ncon+21,"TIRC",x2,0.3,-2.8625,idrotm[nRotMat],"ONLY");
1273 // outer part of the inner sector - 2 x 25 holes
1275 astep = 20.00096874/24.;
1276 alpha = 10.00048437-astep;
1284 for(ncon=0;ncon<25;ncon++){
1290 phi3 = (alpha>0) ? 0. : 180.;
1291 theta3 = TMath::Abs(alpha);
1293 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1297 gMC->Gspos("TPSC",ncon+41,"TIRC",x1,0.3,7.0625,idrotm[nRotMat],"ONLY");
1298 gMC->Gspos("TPSC",ncon+66,"TIRC",x2,0.3,16.9875,idrotm[nRotMat],"ONLY");
1309 //--------------------------------------------------------------------------
1310 // TPC Outer Readout Chambers
1311 // this is NOT a final design
1312 //--------------------------------------------------------------------------
1316 dm[2]= 1.5; //thickness
1319 gMC->Gsvolu("TORC","TRD1",idtmed[4],dm,4);
1321 //------------------------------------------------
1322 // Tpc Outer readout chamber Pad Plane
1323 //------------------------------------------------
1327 gMC->Gsvolu("TOPP","TRD1",idtmed[12],dm,4);
1329 dm[0] -= 1.218511934;
1330 dm[1] -= 1.218511934;
1333 gMC->Gsvolu("TOC3","TRD1",idtmed[1],dm,4);
1335 gMC->Gspos("TOC3",1,"TOPP",0.,0.15,0.,0,"ONLY");
1337 gMC->Gspos("TOPP",1,"TORC",0.,1.0,0.,0,"ONLY");
1347 gMC->Gsposp("TRCE",10,"TORC",0.,-0.8,-2.15,0,"ONLY",dm,4);
1354 gMC->Gsvolu("TOC1","TRD1",idtmed[4],dm,4);
1361 gMC->Gsposp("TRCE",11,"TOC1",0.,0.,0.,0,"ONLY",dm,4);
1365 //-----------------------------------------------
1366 // Tpc Services Support Wheel
1367 //-----------------------------------------------
1382 gMC->Gsvolu("TSSW","PGON",idtmed[4],dm,10);
1384 // Tpc Services Wheel Cover
1389 gMC->Gsvolu("TSWC","PGON",idtmed[4],dm,10);
1391 // Tpc Service wheel Cover Empty space
1398 gMC->Gsvolu("TSCE","TRD1",idtmed[0],dm,4);
1400 // Tpc services Wheel Empty Spaces
1407 gMC->Gsvolu("TWES","TRD1",idtmed[0],dm,4);
1409 // Tpc Services Wheel Bars
1411 gMC->Gsvolu("TSWB","TRD1",idtmed[4],dm,0);
1421 gMC->Gsposp("TSWB",1,"TWES",0.,0.,-85.125,0,"ONLY",dm,4);
1426 gMC->Gsposp("TSWB",2,"TWES",0.,0.,85.125,0,"ONLY",dm,4);
1428 // TPc ELectronics - right now 30% X0 Si
1435 gMC->Gsvolu("TPEL","TRD1",idtmed[11],dm,4);
1436 gMC->Gspos("TPEL",1,"TWES",0.,0.,0.,0,"ONLY");
1438 //--------------------------------------------------------------------------
1440 //--------------------------------------------------------------------------
1442 // TPc Main Wheel - Al
1448 gMC->Gsvolu("TPMW","TUBE",idtmed[4],dm,3);
1450 // TPc Extra Wheel (to avoid overlapping) - Al
1456 gMC->Gsvolu("TPEW","TUBE",idtmed[4],dm,3);
1458 //--------------------------------------------------------------------------
1459 // Tpc Empty Space for the Readout chambers
1460 //--------------------------------------------------------------------------
1464 Float_t dR = 0.5*(rUp-rLow);
1466 space= 1.4/cosAlpha; // wheel ribs are 2.8 cm wide
1468 dm[0]= rLow*tanAlpha-space;
1469 dm[1]= rUp*tanAlpha-space;
1473 gMC->Gsvolu("TESR","TRD1",idtmed[0],dm,4);
1478 gMC->Gspos("TIC1",1,"TESR",0.,0.75,-dR+23.97,0,"ONLY");
1483 gMC->Gspos("TOC1",1,"TESR",0.,0.75,dR-55.02,0,"ONLY");
1485 // Tpc Empty Space Bars - Al (daughters of TESR)
1489 gMC->Gsvolu("TESB","TRD1",idtmed[4],dm,0);
1493 dm[0]= rLow*tanAlpha-space;
1494 dm[1]= 88.7*tanAlpha-space;
1500 gMC->Gsposp("TESB",1,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1504 dm[0]= 131.65*tanAlpha-space;
1505 dm[1]= 136.5*tanAlpha-space;
1508 zBar = -dR +131.65+dm[3]-rLow;
1510 gMC->Gsposp("TESB",2,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1514 dm[0]= 240.4*tanAlpha-space;
1515 dm[1]= rUp*tanAlpha-space;
1520 gMC->Gsposp("TESB",3,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1522 //------------------------------------------------------
1523 // TPc Lower "S" Sectors
1524 //------------------------------------------------------
1527 Float_t inSecLowEdge = fTPCParam->GetInnerRadiusLow();
1528 Float_t inSecUpEdge = fTPCParam->GetInnerRadiusUp();
1530 dm[0] = inSecLowEdge*TMath::Tan(0.5*innerOpenAngle)-0.01;
1531 dm[1] = inSecUpEdge*TMath::Tan(0.5*innerOpenAngle)-0.01;
1532 dm[2] = 0.5*(250. - 0.3);
1533 dm[3] = 0.5*(inSecUpEdge-inSecLowEdge);
1535 gMC->Gsvolu("TPLS", "TRD1", idtmed[2], dm, 4); // sensitive
1537 //----------------------------------------------------------
1538 // TPc Upper Sectors
1539 //----------------------------------------------------------
1541 Float_t ouSecLowEdge = fTPCParam->GetOuterRadiusLow();
1542 Float_t ouSecUpEdge = fTPCParam->GetOuterRadiusUp();
1544 dm[0] = ouSecLowEdge*TMath::Tan(0.5*outerOpenAngle)-0.01;
1545 dm[1] = ouSecUpEdge*TMath::Tan(0.5*outerOpenAngle)-0.01;
1546 dm[2] = 0.5*(250. - 0.3);
1547 dm[3] = 0.5*(ouSecUpEdge-ouSecLowEdge);
1549 gMC->Gsvolu("TPUS", "TRD1", idtmed[2], dm, 4); // sensitive
1554 gMC->Gsvolu("TPSS","TRD1",idtmed[2],dm,0); // sensitive
1556 Int_t nofStrips,nstr;
1558 Float_t stripThick = 0.01; // 100 microns
1564 // if all lower sectors selected define only 1 strip
1566 nofStrips=((fSecAL <0)||(fSecAL>=0 && fSens<0)) ? 1 : fTPCParam->GetNRowLow();
1567 deadSpace = fTPCParam->GetInnerWireMount();
1569 dm[2] = 0.5*(250. - 0.3);
1570 dm[3] = 0.5 * stripThick;
1573 for(nstr=0;nstr<nofStrips;nstr++){
1575 r1 = fTPCParam->GetPadRowRadiiLow(nstr);
1576 r2 = r1 + stripThick;
1577 dm[0] = r1 * TMath::Tan(0.5*innerOpenAngle) - deadSpace;
1578 dm[1] = r2 * TMath::Tan(0.5*innerOpenAngle) - deadSpace;
1579 zs = -inSecLowEdge -0.5*(inSecUpEdge-inSecLowEdge);
1583 gMC->Gsposp("TPSS", nstr+1, "TPLS", 0., 0., zs, 0, "ONLY", dm, 4);
1588 // strips only if several upper sectors selected end fSens > 0
1590 if(fSecAU >=0 && fSens >0){
1592 Int_t nsSave = nofStrips;
1596 nofStrips = fTPCParam->GetNRowUp();
1597 deadSpace = fTPCParam->GetOuterWireMount();
1599 dm[2] = 0.5*(250. - 0.3);
1600 dm[3] = 0.5 * stripThick;
1603 for(nstr=0;nstr<nofStrips;nstr++){
1605 r1 = fTPCParam->GetPadRowRadiiUp(nstr);
1606 r2 = r1 + stripThick;
1607 dm[0] = r1 * TMath::Tan(0.5*outerOpenAngle) - deadSpace;
1608 dm[1] = r2 * TMath::Tan(0.5*outerOpenAngle) - deadSpace;
1609 zs = -ouSecLowEdge -0.5*(ouSecUpEdge-ouSecLowEdge);
1613 gMC->Gsposp("TPSS", nstr+1+nsSave, "TPUS", 0., 0., zs, 0, "ONLY", dm, 4);
1618 //-------------------------------------------------------
1619 // positioning of the empty spaces into the main wheel
1620 // and readout chambers and sectors into the drift gas
1621 //-------------------------------------------------------
1623 Float_t rCenter,xc,yc;
1624 Float_t rInner,rOuter; // center of the inner and outer chamber
1631 for(Int_t ns=0; ns<nInnerSector;ns++){
1633 phi1 = ns * innerOpenAngle + innerAngleShift;
1634 phi1 *= kRaddeg; // in degrees
1636 phi1 = (Float_t)TMath::Nint(phi1) + 270.;
1638 if (phi1 > 360.) phi1 -= 360.;
1643 phi3 = ns * innerOpenAngle + innerAngleShift;
1644 phi3 *= kRaddeg; // in degrees
1646 phi3 = (Float_t)TMath::Nint(phi3);
1648 if(phi3 > 360.) phi3 -= 360.;
1652 // "holes"->End plate
1654 xc = rCenter*TMath::Cos(phi3*kDegrad);
1655 yc = rCenter*TMath::Sin(phi3*kDegrad);
1657 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1659 gMC->Gspos("TESR",ns+1,"TPMW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1661 // TSCE->TSWC (services wheel volumes)
1663 xc = 166.142*TMath::Cos(phi3*kDegrad);
1664 yc = 166.142*TMath::Sin(phi3*kDegrad);
1666 gMC->Gspos("TSCE",ns+1,"TSWC",xc,yc,0.,idrotm[nRotMat],"ONLY");
1667 gMC->Gspos("TWES",ns+1,"TSSW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1669 // readout chambers->TDGN (drift gas)
1671 xc = rInner*TMath::Cos(phi3*kDegrad);
1672 yc = rInner*TMath::Sin(phi3*kDegrad);
1674 gMC->Gspos("TIRC",ns+1,"TDGN",xc,yc,252.,idrotm[nRotMat],"ONLY");
1676 // here lower sectors
1680 // all lower sectors are positioned
1682 gMC->Gspos("TPLS",ns+1,"TDGN",xc,yc,125.15,idrotm[nRotMat],"ONLY");
1684 Gspos("TPLS",ns+nInnerSector+1,"TDGN",xc,yc,-125.15,idrotm[nRotMat],"ONLY");
1688 // only selected sectors are positioned (up to 6 sectors)
1690 for(Int_t sel=0;sel<6;sel++){
1692 if(fSecLows[sel] == ns){
1693 gMC->Gspos("TPLS",ns+1,"TDGN",xc,yc,125.15,idrotm[nRotMat],"ONLY");
1695 else if(fSecLows[sel] == ns+nInnerSector){
1697 Gspos("TPLS",ns+nInnerSector+1,"TDGN",xc,yc,-125.15,idrotm[nRotMat],"ONLY");
1700 } // lower sectors finished
1702 xc = rOuter*TMath::Cos(phi3*kDegrad);
1703 yc = rOuter*TMath::Sin(phi3*kDegrad);
1705 gMC->Gspos("TORC",ns+1,"TDGN",xc,yc,252.1,idrotm[nRotMat],"ONLY");
1707 // here upper sectors
1711 // all upper sectors
1713 gMC->Gspos("TPUS",ns+1,"TDGN",xc,yc,125.15,idrotm[nRotMat],"ONLY");
1715 Gspos("TPUS",ns+nOuterSector+1,"TDGN",xc,yc,-125.15,idrotm[nRotMat],"ONLY");
1719 // only selected sectors (up to 12)
1721 for(Int_t sel=0;sel<12;sel++){
1722 if(fSecUps[sel] == ns+2*nInnerSector){
1723 gMC->Gspos("TPUS",ns+1,"TDGN",xc,yc,125.15,idrotm[nRotMat],"ONLY");
1725 else if(fSecUps[sel] == ns+2*nInnerSector+nOuterSector){
1727 Gspos("TPUS",ns+nOuterSector+1,"TDGN",xc,yc,-125.15,idrotm[nRotMat],"ONLY");
1730 } // upper sectors finished
1734 theta2 = 0.; // reflection, needed for readout chambers!
1736 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1738 xc = rInner*TMath::Cos(phi3*kDegrad);
1739 yc = rInner*TMath::Sin(phi3*kDegrad);
1741 gMC->Gspos("TIRC",ns+nInnerSector+1,"TDGN",xc,yc,-252.,idrotm[nRotMat],"ONLY");
1743 xc = rOuter*TMath::Cos(phi3*kDegrad);
1744 yc = rOuter*TMath::Sin(phi3*kDegrad);
1746 gMC->Gspos("TORC",ns+nOuterSector+1,"TDGN",xc,yc,-252.1,idrotm[nRotMat],"ONLY");
1753 // reflection matrix
1762 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1767 gMC->Gspos("TPMW",1,"TPC ",0.,0.,256.6,0,"ONLY");
1768 gMC->Gspos("TPMW",2,"TPC ",0.,0.,-256.6,idrotm[nRotMat],"ONLY");
1769 gMC->Gspos("TPEW",1,"TPC ",0.,0.,257.65,0,"ONLY");
1770 gMC->Gspos("TPEW",2,"TPC ",0.,0.,-257.65,0,"ONLY");
1774 //-------------------------------------------------------
1775 // Tpc High Voltage Membrane - NOMEX honeycomb
1776 //-------------------------------------------------------
1795 gMC->Gsvolu("THVM","PGON",idtmed[6],dm,10);
1797 gMC->Gspos("THVM",1,"TDGN",0.,0.,0.,0,"ONLY");
1799 //----------------------------------------------------------
1800 // TPc Support Rods - MAKROLON
1801 //----------------------------------------------------------
1807 gMC->Gsvolu("TPSR","TUBE",idtmed[7],dm,3);
1809 for(Int_t nrod=1;nrod<18;nrod++){
1810 Float_t angle=innerOpenAngle*(Float_t)nrod;
1812 xc=82.4*TMath::Cos(angle);
1813 yc=82.4*TMath::Sin(angle);
1815 gMC->Gspos("TPSR",nrod,"TDGN",xc,yc,126.95,0,"ONLY");
1816 gMC->Gspos("TPSR",nrod+17,"TDGN",xc,yc,-126.95,0,"ONLY");
1818 xc=254.2*TMath::Cos(angle);
1819 yc=254.2*TMath::Sin(angle);
1821 gMC->Gspos("TPSR",nrod+34,"TDGN",xc,yc,126.95,0,"ONLY");
1822 gMC->Gspos("TPSR",nrod+51,"TDGN",xc,yc,-126.95,0,"ONLY");
1826 //----------------------------------------------------------
1827 // Tpc High Voltage rod - MAKROLON + Copper cable
1828 //----------------------------------------------------------
1830 // rod with cable (Left)
1836 gMC->Gsvolu("THVL","TUBE",idtmed[7],dm,3);
1844 gMC->Gsvolu("THVC","TUBE",idtmed[10],dm,3);
1852 gMC->Gsvolu("THVE","TUBE",idtmed[1],dm,3);
1854 gMC->Gspos("THVC",1,"THVL",0.,0.,0.,0,"ONLY");
1855 gMC->Gspos("THVE",1,"THVL",0.,0.,0.,0,"ONLY");
1857 // rod without cable
1863 gMC->Gsvolu("THVR","TUBE",idtmed[7],dm,3);
1867 gMC->Gspos("THVL",1,"TDGN",82.4,0.,-126.95,0,"ONLY");
1868 gMC->Gspos("THVL",2,"TDGN",254.2,0.,-126.95,0,"ONLY");
1870 gMC->Gspos("THVR",1,"TDGN",82.4,0.,126.95,0,"ONLY");
1871 gMC->Gspos("THVR",2,"TDGN",254.2,0.,126.95,0,"ONLY");
1875 gMC->Gspos("TDGN",1,"TPC ",0.,0.,0.,0,"ONLY");
1877 // services wheel cover -> wheel
1880 gMC->Gspos("TSWC",1,"TSSW",0.,0.,4.5,0,"ONLY");
1881 gMC->Gspos("TSWC",2,"TSSW",0.,0.,-4.5,0,"ONLY");
1884 // put the wheel into the TPC
1886 gMC->Gspos("TSSW",1,"TPC ",0.,0.,278.7,0,"ONLY");
1887 gMC->Gspos("TSSW",2,"TPC ",0.,0.,-278.7,0,"ONLY");
1889 gMC->Gsord("TPMW",6);
1890 if(fSecAL >=0) gMC->Gsord("TPLS",3);
1891 if(fSecAU >=0 && fSens >0) gMC->Gsord("TPUS",3);
1892 gMC->Gsord("TDGN",6);
1893 gMC->Gsord("TSSW",6);
1894 gMC->Gsord("TSWC",6);
1896 // put the TPC into ALIC (main mother volume)
1898 gMC->Gspos("TPC ", 1, "ALIC", 0, 0, 0, 0, "ONLY");
1900 } // end of function
1902 //_____________________________________________________________________________
1903 void AliTPCv2::DrawDetector()
1906 // Draw a shaded view of the Time Projection Chamber version 1
1909 // Set everything unseen
1910 gMC->Gsatt("*", "seen", -1);
1912 // Set ALIC mother transparent
1913 gMC->Gsatt("ALIC","SEEN",0);
1915 // Set the volumes visible
1918 gMC->Gsatt("TPC ","SEEN",0);
1919 gMC->Gsatt("TOIN","SEEN",1);
1920 gMC->Gsatt("TOIN","COLO",7);
1921 gMC->Gsatt("TPCR","SEEN",0);
1922 gMC->Gsatt("TOCV","SEEN",1);
1923 gMC->Gsatt("TOCV","COLO",4);
1924 gMC->Gsatt("TSA1","SEEN",0);
1925 gMC->Gsatt("TSA2","SEEN",0);
1926 gMC->Gsatt("TSA3","SEEN",0);
1927 gMC->Gsatt("TSA4","SEEN",0);
1928 gMC->Gsatt("TOFC","SEEN",1);
1929 gMC->Gsatt("TOFC","COLO",4);
1930 gMC->Gsatt("TSA5","SEEN",0);
1931 gMC->Gsatt("TSA6","SEEN",0);
1932 gMC->Gsatt("TSA7","SEEN",0);
1933 gMC->Gsatt("TIIN","COLO",7);
1934 gMC->Gsatt("TIIN","SEEN",1);
1935 gMC->Gsatt("TICL","SEEN",0);
1936 gMC->Gsatt("TSA9","SEEN",0);
1937 gMC->Gsatt("TS10","SEEN",0);
1938 gMC->Gsatt("TS11","SEEN",0);
1939 gMC->Gsatt("TS12","SEEN",0);
1940 gMC->Gsatt("TICR","SEEN",0);
1941 gMC->Gsatt("TS13","SEEN",0);
1942 gMC->Gsatt("TS14","SEEN",0);
1943 gMC->Gsatt("TS15","SEEN",0);
1944 gMC->Gsatt("TS16","SEEN",0);
1945 gMC->Gsatt("TIFC","SEEN",1);
1946 gMC->Gsatt("TIFC","COLO",4);
1947 gMC->Gsatt("TS17","SEEN",0);
1948 gMC->Gsatt("TS18","SEEN",0);
1949 gMC->Gsatt("TS19","SEEN",0);
1950 gMC->Gsatt("TS21","SEEN",0);
1951 gMC->Gsatt("TS22","SEEN",0);
1952 gMC->Gsatt("TS23","SEEN",0);
1953 gMC->Gsatt("TS24","SEEN",0);
1954 gMC->Gsatt("TDGN","SEEN",0);
1955 gMC->Gsatt("TIRC","SEEN",0);
1956 gMC->Gsatt("TIC1","SEEN",1);
1957 gMC->Gsatt("TIPP","SEEN",0);
1958 gMC->Gsatt("TIC3","SEEN",0);
1959 gMC->Gsatt("TRCE","SEEN",0);
1960 gMC->Gsatt("TPSC","SEEN",0);
1961 gMC->Gsatt("TPCC","SEEN",0);
1962 gMC->Gsatt("TORC","SEEN",0);
1963 gMC->Gsatt("TOPP","SEEN",0);
1964 gMC->Gsatt("TOC3","SEEN",0);
1965 gMC->Gsatt("TOC1","SEEN",1);
1966 gMC->Gsatt("TSSW","SEEN",1);
1967 gMC->Gsatt("TSWC","SEEN",1);
1968 gMC->Gsatt("TSCE","SEEN",1);
1969 gMC->Gsatt("TSSW","COLO",3);
1970 gMC->Gsatt("TSWC","COLO",3);
1971 gMC->Gsatt("TSCE","COLO",6);
1972 gMC->Gsatt("TWES","SEEN",0);
1973 gMC->Gsatt("TSWB","SEEN",0);
1974 gMC->Gsatt("TPEL","SEEN",0);
1975 gMC->Gsatt("TPMW","SEEN",1);
1976 gMC->Gsatt("TPEW","SEEN",1);
1977 gMC->Gsatt("TESR","SEEN",1);
1978 gMC->Gsatt("TPMW","COLO",12);
1979 gMC->Gsatt("TPEW","COLO",12);
1980 gMC->Gsatt("TWES","COLO",5);
1981 gMC->Gsatt("TIC1","COLO",5);
1982 gMC->Gsatt("TOC1","COLO",5);
1983 gMC->Gsatt("TESB","SEEN",0);
1984 gMC->Gsatt("TPLS","SEEN",0);
1985 gMC->Gsatt("TPUS","SEEN",0);
1986 gMC->Gsatt("TPSS","SEEN",0);
1987 gMC->Gsatt("THVM","SEEN",1);
1988 gMC->Gsatt("THVM","COLO",11);
1989 gMC->Gsatt("TPSR","SEEN",0);
1990 gMC->Gsatt("THVL","SEEN",0);
1991 gMC->Gsatt("THVC","SEEN",0);
1992 gMC->Gsatt("THVE","SEEN",0);
1993 gMC->Gsatt("THVR","SEEN",0);
1996 gMC->Gdopt("hide", "on");
1997 gMC->Gdopt("shad", "on");
1998 gMC->Gsatt("*", "fill", 7);
1999 gMC->SetClipBox(".");
2000 gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
2001 gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
2002 gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
2003 gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
2004 gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
2005 gMC->DefaultRange();
2006 gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
2007 gMC->Gdhead(1111, "Time Projection Chamber");
2008 gMC->Gdman(18, 4, "MAN");
2009 gMC->Gdopt("hide","off");
2012 //_____________________________________________________________________________
2013 void AliTPCv2::CreateMaterials()
2016 // Define materials for version 2 of the Time Projection Chamber
2019 AliTPC::CreateMaterials();
2022 //_____________________________________________________________________________
2023 void AliTPCv2::Init()
2026 // Initialises version 2 of the TPC after that it has been built
2029 Int_t *idtmed = fIdtmed->GetArray();
2035 fIdSens=gMC->VolId("TPSS");
2037 fIdLSec=gMC->VolId("TPLS"); // lower sector
2038 fIdUSec=gMC->VolId("TPUS"); // upper sector
2040 gMC->SetMaxNStep(30000); // max. number of steps increased
2042 gMC->Gstpar(idtmed[2],"LOSS",5); // specific energy loss
2044 printf("*** TPC version 2 initialized ***\n");
2045 printf("Maximum number of steps = %d\n",gMC->GetMaxNStep());
2051 //_____________________________________________________________________________
2052 void AliTPCv2::StepManager()
2055 // Called for every step in the Time Projection Chamber
2059 // parameters used for the energy loss calculations
2061 const Float_t kprim = 14.35; // number of primary collisions per 1 cm
2062 const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
2063 const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
2066 const Float_t kbig = 1.e10;
2073 vol[1]=0; // preset row number to 0
2077 gMC->SetMaxStep(kbig);
2079 if(!gMC->IsTrackAlive()) return; // particle has disappeared
2081 Float_t charge = gMC->TrackCharge();
2083 if(TMath::Abs(charge)<=0.) return; // take only charged particles
2085 // check the sensitive volume
2087 id = gMC->CurrentVolID(copy); // current volume Id
2090 vol[0] = copy-1; // lower sector number
2092 else if(id == fIdUSec){
2093 vol[0] = copy+fTPCParam->GetNInnerSector()-1; // upper sector number
2095 else if(id == fIdSens && gMC->IsTrackEntering()){
2097 // track is entering the sensitive strip
2099 vol[1]= copy-1; // row number (absolute)
2103 id = gMC->CurrentVolOffID(1,copy);
2109 vol[0] = copy-1; // sector number
2116 vol[0] = copy-1+fTPCParam->GetNInnerSector(); // sector number
2117 vol[1] -= fTPCParam->GetNRowLow(); // row number (starts also from 0)
2123 // because Jouri wants to have this
2125 gMC->TrackMomentum(p);
2129 hits[3]=0.; // this hit has no energy loss
2130 // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2132 AddHit(gAlice->CurrentTrack(), vol,hits); //MI change
2136 gMC->TrackPosition(p);
2140 hits[3]=0.; // this hit has no energy loss
2141 // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2143 AddHit(gAlice->CurrentTrack(), vol,hits); //MI change
2148 //-----------------------------------------------------------------
2149 // charged particle is in the sensitive volume
2150 //-----------------------------------------------------------------
2152 if(gMC->TrackStep() > 0) {
2154 Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
2155 nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
2157 gMC->TrackPosition(p);
2161 hits[3]=(Float_t)nel;
2165 // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2167 gMC->TrackMomentum(p);
2168 Float_t momentum = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
2169 Float_t precision = (momentum>0.1) ? 0.002 :0.01;
2170 fTrackHits->SetHitPrecision(precision);
2172 AddHit(gAlice->CurrentTrack(), vol,hits); //MI change
2176 // Stemax calculation for the next step
2180 gMC->TrackMomentum(mom);
2181 Float_t ptot=mom.Rho();
2182 Float_t betaGamma = ptot/gMC->TrackMass();
2184 Int_t pid=gMC->TrackPid();
2185 if((pid==kElectron || pid==kPositron) && ptot > 0.002)
2187 pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
2191 pp=kprim*BetheBloch(betaGamma);
2192 if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
2196 gMC->Rndm(random,1); // good, old GRNDM from Geant3
2198 Double_t rnd = (Double_t)random[0];
2200 gMC->SetMaxStep(-TMath::Log(rnd)/pp);
2204 //_____________________________________________________________________________
2205 Float_t AliTPCv2::BetheBloch(Float_t bg)
2208 // Bethe-Bloch energy loss formula
2210 const Double_t kp1=0.76176e-1;
2211 const Double_t kp2=10.632;
2212 const Double_t kp3=0.13279e-4;
2213 const Double_t kp4=1.8631;
2214 const Double_t kp5=1.9479;
2216 Double_t dbg = (Double_t) bg;
2218 Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
2220 Double_t aa = TMath::Power(beta,kp4);
2221 Double_t bb = TMath::Power(1./dbg,kp5);
2223 bb=TMath::Log(kp3+bb);
2225 return ((Float_t)((kp2-aa-bb)*kp1/aa));