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 //-------------------------------------------------------------------------
22 //-------------------------------------------------------------------------
24 #include <Riostream.h>
27 #include <TVirtualMC.h>
31 #include "AliPIPEv0.h"
37 //_____________________________________________________________________________
38 AliPIPEv0::AliPIPEv0()
44 //_____________________________________________________________________________
45 AliPIPEv0::AliPIPEv0(const char *name, const char *title)
53 //___________________________________________
54 void AliPIPEv0::CreateGeometry()
58 <img src="picts/pipe.gif">
65 <img src="picts/tree_pipe.gif">
69 AliDebugClass(1,"Create PIPEv0 geometry");
72 Int_t *idtmed = fIdtmed->GetArray();
73 Float_t ppcon[90], ptube[3], pbox[3];
78 AliMatrix(idrotm[2001],90.,240., 0., 0., 90.,150.);
79 AliMatrix(idrotm[2002],90., 0., 0., 0., 90.,270.);
80 AliMatrix(idrotm[2003],90.,120., 0., 0., 90., 30.);
81 AliMatrix(idrotm[2004],90.,315., 90., 45., 0., 0.);
82 AliMatrix(idrotm[2005],90.,270., 90., 0., 0., 0.);
83 AliMatrix(idrotm[2006],90.,225., 90.,315., 0., 0.);
84 AliMatrix(idrotm[2007],90.,180., 90.,270., 0., 0.);
85 AliMatrix(idrotm[2008],90.,135., 90.,225., 0., 0.);
86 AliMatrix(idrotm[2009],90., 90., 90.,180., 0., 0.);
87 AliMatrix(idrotm[2010],90., 45., 90.,135., 0., 0.);
89 AliMatrix(idrotm[2012],90.,180., 90., 90.,180., 0.);
90 AliMatrix(idrotm[2013],90., 0., 90., 90.,180., 0.);
94 // distance between bellows
95 // total size of bellow section
96 const Float_t kdzb = 14.6;
97 // size of undulated region
101 // distance between bellows
102 const Float_t kdzbbA = 4.6;
103 // total size of bellow section
104 const Float_t kdzbA = 14.6;
105 // size of undulated region
106 const Float_t kdzubA = 3.75;
108 // half-lengths of various beam pipe sections
110 Float_t hlenQbbe1 = 40.;
111 Float_t hlenQbbe2 = 36.5;
112 Float_t hlenQbbe = (hlenQbbe1+hlenQbbe2)/2.;
115 // Float_t hlenQbt1 = 5.5/2.;
117 // Pipe outside central region (non-absorber side)
118 Float_t hlenQbab = 157.5 + 23./2.;
120 // Flange non-absorber side
121 Float_t hlenQb29 = 11.5/2.+1.75 + 5.0;
124 Float_t hlenQbe0 = kdzbA;
126 // Inox pipe between Be and Bellow (absorber side)
127 Float_t hlenQb24[3] = {11.3/2., 1.8, 3.3};
130 Float_t hlenQb28 = (800.-hlenQbbe1-2.*hlenQbab-4.*hlenQb29-2.*hlenQbe0)/2.;
132 // Position of the pump
133 Float_t zPump = hlenQbbe1+2.*hlenQbab+2.*hlenQb29+kdzb;
135 // Inner beam pipe radius
137 const Float_t kRinBe = 2.9;
139 const Float_t kRinSt = 2.9;
141 const Float_t kRinSB = 2.92;
143 // Outer beam pipe radius
145 const Float_t kRoutBe = 2.98;
147 const Float_t kRoutSt = 2.98;
149 const Float_t kRoutSB = 3.00;
155 // The peam pipe up to the Front Absorber
157 // Mother Volume QBPM
174 ppcon[12] = -90+2.*hlenQb24[2]+2.8+2.*hlenQb24[1];
178 ppcon[15] = ppcon[12];
182 ppcon[18] = ppcon[15] + 2.5 + 2.*kdzubA+0.2;
186 ppcon[21] = ppcon[18];
190 ppcon[24] = ppcon[21] + 2.* kdzbbA-0.4;
194 ppcon[27] = ppcon[24];
214 ppcon[42] = hlenQbbe1+2.*hlenQbab-0.1;
218 ppcon[45] = ppcon[42];
222 ppcon[48] = ppcon[45]+2.*hlenQb29-5.;
226 ppcon[51] = ppcon[48];
230 ppcon[54] = ppcon[51]+2.*kdzb+10.;
234 ppcon[57] = ppcon[54];
242 gMC->Gsvolu("QBPM", "PCON", idtmed[kAir], ppcon,63);
246 // volume definitions of various sections
251 gMC->Gsvolu("QBVA","TUBE", idtmed[kVac], ptube, 0);
254 ptube[2] = (90.-hlenQbbe2)/2.;
255 dz = -90. + ptube[2];
256 gMC->Gsposp ("QBVA", 1, "QBPM", 0., 0., dz , 0, "ONLY", ptube, 3);
260 ptube[2] = hlenQbbe+hlenQbab;
262 gMC->Gsposp ("QBVA", 2, "QBPM", 0., 0., dz , 0, "ONLY", ptube, 3);
266 ptube[2] = (800.-hlenQbbe1-2.*hlenQbab)/2.;
268 gMC->Gsposp ("QBVA", 3, "QBPM", 0., 0., dz , 0, "ONLY", ptube, 3);
271 // Be Pipe in central Alice
276 gMC->Gsvolu("QBBE","TUBE", idtmed[kBe], ptube, 3);
285 gMC->Gsvolu("QBSR", "TUBE", idtmed[kAlu], ptube,3);
289 gMC->Gsvolu("QBSS", "TUBE", idtmed[kPA], ptube,3);
290 gMC->Gspos("QBSS", 1, "QBSR", 0.0, 0.0, 0.0, 0, "ONLY");
292 gMC->Gspos("QBSR", 1, "QBPM", 0.0, 0.0, 40., 0, "ONLY");
293 gMC->Gspos("QBSR", 2, "QBPM", 0.0, 0.0, 150., 0, "ONLY");
294 gMC->Gspos("QBSR", 3, "QBPM", 0.0, 0.0, 260., 0, "ONLY");
295 gMC->Gspos("QBSR", 4, "QBPM", 0.0, 0.0,- 46., 0, "ONLY");
297 // Flange and Fixed Point: non absorber side
306 ppcon[3] = -hlenQb29;
310 ppcon[6] = ppcon[3]+3.6;
318 ppcon[12] = hlenQb29;
322 gMC->Gsvolu("QB29", "PCON", idtmed[kAir], ppcon,15);
329 gMC->Gsvolu("QF29","TUBE", idtmed[kInox], ptube, 3);
330 gMC->Gspos("QF29", 1, "QB29", 0.0, 0.0, -hlenQb29+1.75, 0, "ONLY");
335 gMC->Gsvolu("QS29","TUBE", idtmed[kInox], ptube, 3);
336 gMC->Gspos("QS29", 1, "QB29", 0.0, 0.0, 0., 0, "ONLY");
341 gMC->Gsvolu("QP29","TUBE", idtmed[kInox], ptube, 3);
342 gMC->Gspos("QP29", 1, "QB29", 0.0, 0.0, -hlenQb29+9.75+3., 0, "ONLY");
346 // Inox beam pipe: final section on non-absorber side
352 gMC->Gsvolu("QB28","TUBE", idtmed[kInox], ptube, 3);
355 // Al-Be (40-60 wgt%, rho=2.7 g/cm**3) beam pipe
357 // This section is under study (A.M. 1/2/2002)
361 if (fPipeMaterial == kAlu) {
363 } else if (fPipeMaterial == kBe) {
365 } else if (fPipeMaterial == kInox){
370 gMC->Gsvolu("QBAB","TUBE", idtmed[fPipeMaterial], ptube, 3);
372 // 2.5 mm thick SS tube for hanging pump
378 gMC->Gsvolu("QB26","TUBE", idtmed[kInox], ptube, 3);
385 Float_t pconQBE0[33];
390 pconQBE0[ 3] = -kdzbA;
391 pconQBE0[ 4] = kRinSB;
392 pconQBE0[ 5] = kRoutSB;
394 pconQBE0[ 6] = -kdzbA+2.5;
395 pconQBE0[ 7] = kRinSB;
396 pconQBE0[ 8] = kRoutSB;
398 pconQBE0[ 9] = -kdzbA+2.5;
399 pconQBE0[10] = kRinSB;
402 pconQBE0[12] = -kdzbA+2.5+2.*kdzubA;
403 pconQBE0[13] = kRinSB;
406 pconQBE0[15] = -kdzbA+2.5+2.*kdzubA;
407 pconQBE0[16] = kRinSB;
408 pconQBE0[17] = kRoutSB;
410 pconQBE0[18] = -kdzbA+2.5+2.*kdzubA+2.*kdzbbA;
411 pconQBE0[19] = kRinSB;
412 pconQBE0[20] = kRoutSB;
414 pconQBE0[21] = -kdzbA+2.5+2.*kdzubA+2.*kdzbbA;
415 pconQBE0[22] = kRinSB;
418 pconQBE0[24] = -kdzbA+2.5+4.*kdzubA+2.*kdzbbA;
419 pconQBE0[25] = kRinSB;
422 pconQBE0[27] = -kdzbA+2.5+4.*kdzubA+2.*kdzbbA;
423 pconQBE0[28] = kRinSB;
424 pconQBE0[29] = kRoutSB;
426 pconQBE0[30] = -kdzbA+5.0+4.*kdzubA+2.*kdzbbA;
427 pconQBE0[31] = kRinSB;
428 pconQBE0[32] = kRoutSB;
430 gMC->Gsvolu("QBE0", "PCON", idtmed[kAir], pconQBE0, 33);
432 // Undulated piece mother
436 gMC->Gsvolu("QBEM","TUBE", idtmed[kAir], ptube, 3);
437 dz = -kdzbA+kdzubA+2.5;
438 gMC->Gspos("QBEM", 2 ,"QBE0", 0.0, 0.0, dz, 0 , "ONLY");
439 gMC->Gspos("QBEM", 1 ,"QBE0", 0.0, 0.0, -dz, idrotm[2012], "ONLY");
443 Float_t ur = 2.*kdzubA-36.*uw;
453 pund[ 5] = kRinSB+uw;
463 pund[12] = pund[9]+uw;
471 pund[18] = pund[12]+uz;
479 pund[24] = pund[21]+uw;
483 gMC->Gsvolu("QBEU", "PCON", idtmed[kInox], pund, 27);
485 for (i = 0; i < 18; i++)
487 dz = -kdzubA+(1+2*i)*ut;
488 gMC->Gspos("QBEU", i+1 ,"QBEM", 0.0, 0.0, dz, 0 , "ONLY");
491 ptube[1] = kRinSB+uw;
493 gMC->Gsvolu("QBEW","TUBE", idtmed[kInox], ptube, 3);
494 gMC->Gspos("QBEW", 1 ,"QBEM", 0.0, 0.0, kdzubA-uz, 0 , "ONLY");
498 gMC->Gsvolu("QBEP","TUBE", idtmed[kInox], ptube, 0);
502 gMC->Gsposp("QBEP", 1 ,"QBE0", 0.0, 0.0, -kdzbA+1.25, 0 , "ONLY", ptube, 3);
503 gMC->Gsposp("QBEP", 2 ,"QBE0", 0.0, 0.0, kdzbA-1.25, 0 , "ONLY", ptube, 3);
505 gMC->Gsposp("QBEP", 3 ,"QBE0", 0.0, 0.0, 0., 0 , "ONLY", ptube, 3);
510 // **** Placement of various sections on non-absorber side ****
513 // first the beryllium section
514 Float_t zpos = -(hlenQbbe2-hlenQbbe1)/2;
515 gMC->Gspos("QBBE", 1, "QBPM", 0., 0., zpos, 0, "ONLY");
517 // next meta-metal transition QBT1 on on-absorber side
518 // zpos = zpos + hlenQbbe + hlenQbt1;
519 // gMC->Gspos("QBT1", 1, "QBPM", 0., 0., zpos, 0, "ONLY");
521 // Aluminium OR Al-be alloy section
522 zpos = hlenQbbe1+hlenQbab;
523 gMC->Gspos("QBAB", 1, "QBPM", 0.0, 0.0, zpos, 0, "ONLY");
525 // inox flange at the start of bellow
526 zpos = zpos + hlenQbab + hlenQb29;
527 gMC->Gspos("QB29", 1, "QBPM", 0.0, 0.0, zpos, idrotm[2012], "ONLY");
530 zpos = zpos + hlenQb29 + hlenQbe0;
531 gMC->Gspos("QBE0", 2 ,"QBPM", 0.0, 0.0, zpos, 0, "ONLY");
533 // inox flange at the end of bellow and start of thick inox for pump
534 zpos = zpos + hlenQbe0 + hlenQb29;
535 gMC->Gspos("QB29", 2, "QBPM", 0.0, 0.0, zpos, 0, "ONLY");
537 //last inox section till 800 cm
538 zpos = zpos + hlenQb29 + hlenQb28;
539 gMC->Gspos("QB28", 1, "QBPM", 0.0, 0.0, zpos, 0, "ONLY");
541 //******** end of placement on non-absorber side *********
543 // **** Absorber side *****
547 // Beam pipes between elements
549 gMC->Gsvolu("QB24","TUBE", idtmed[kInox], ptube, 0);
552 ptube[2] = hlenQb24[0];
558 bpbe[ 3] = -hlenQb24[0];
562 bpbe[ 6] = hlenQb24[0] - 5.8;
566 bpbe[ 9] = hlenQb24[0] - 5.8;
570 bpbe[12] = hlenQb24[0] - 4.5;
574 bpbe[15] = hlenQb24[0] - 4.5;
578 bpbe[18] = hlenQb24[0] - 3.5;
582 bpbe[21] = hlenQb24[0] - 3.5;
586 bpbe[24] = hlenQb24[0] - 3.0;
590 bpbe[27] = hlenQb24[0] - 3.0;
594 bpbe[30] = hlenQb24[0];
598 gMC->Gsvolu("QA24","PCON", idtmed[kInox], bpbe, 33);
600 dz = hlenQbbe2 + hlenQb24[0];
602 gMC->Gspos("QA24", 1 ,"QBPM", 0.0, 0.0, -dz, 0, "ONLY");
604 // Bellow on absorber side
606 dz = dz+hlenQb24[0] + kdzbA;
607 gMC->Gspos("QBE0", 1 ,"QBPM", 0.0, 0.0, -dz, 0, "ONLY");
609 ptube[2] = hlenQb24[1];
610 dz = dz + kdzb + ptube[2];
611 gMC->Gsposp("QB24", 2 ,"QBPM", 0.0, 0.0, -dz, 0, "ONLY", ptube, 3);
622 gMC->Gsvolu("QFA0","TUBE", idtmed[kInox], ptube, 3);
624 gMC->Gspos("QFA0", 1 ,"QBPM", 0.0, 0.0, -dz, 0, "ONLY");
630 ptube[2] = hlenQb24[2];
632 gMC->Gsposp("QB24", 3 ,"QBPM", 0.0, 0.0, -dz, 0, "ONLY", ptube, 3);
634 // --- Place the PIPE ghost volume (QBPM) in its mother volume (ALIC)
635 // by rotating it to 180 deg. and make it invisible
637 gMC->Gspos("QBPM",1,"ALIC", 0, 0, 0, 0, "ONLY");
638 gMC->Gsbool("QBPM", "L3DX");
639 gMC->Gsbool("QBPM", "L3O3");
640 gMC->Gsbool("QBPM", "L3O4");
644 // ******** Ion Pump volume description starts here ******
651 gMC->Gsvolu("QI32","BOX", idtmed[kInox], pbox, 3);
656 gMC->Gsvolu("QI42","BOX", idtmed[kGetter], pbox, 3);
657 gMC->Gspos("QI42", 1, "QI32", 0.0, 0.0, 0.0, 0, "ONLY");
663 gMC->Gsvolu("QI33","TUBE", idtmed[kInox], ptube, 3);
669 gMC->Gsvolu("QI43","TUBE", idtmed[kAir], ptube, 3);
670 gMC->Gspos("QI43", 1, "QI33", 0.0, 0.0, 0.0, 0, "ONLY");
672 // Connecting tube ->
676 gMC->Gsvolu("QI34","TUBE", idtmed[kInox], ptube, 3);
681 gMC->Gsvolu("QI44","TUBE", idtmed[kAir], ptube, 3);
682 gMC->Gspos("QI44", 1, "QI34", 0.0, 0.0, 0.0, 0, "ONLY");
690 gMC->Gsvolu("QI35","TUBE", idtmed[kInox], ptube, 3);
692 gMC->Gspos("QI32", 1, "QBPM", 0.0, -44.25, zPump, 0, "ONLY");
693 gMC->Gspos("QI33", 1, "QBPM", 0.0, -35.00, zPump,idrotm[2002], "ONLY");
694 gMC->Gspos("QI34", 1, "QBPM", 0.0, -17.90, zPump,idrotm[2002], "ONLY");
695 gMC->Gspos("QI35", 1, "QBPM", 0.0, -24.35, zPump,idrotm[2002], "ONLY");
697 gMC->Gsatt("QBPM", "SEEN", 1);
698 gMC->Gsatt("QBEM", "SEEN", 1);
703 //___________________________________________
704 void AliPIPEv0::CreateMaterials()
707 // Define materials for beam pipe
710 AliDebugClass(1,"Create PIPEv0 materials");
711 Int_t isxfld = gAlice->Field()->Integ();
712 Float_t sxmgmx = gAlice->Field()->Max();
714 Float_t asteel[4] = { 55.847,51.9961,58.6934,28.0855 };
715 Float_t zsteel[4] = { 26.,24.,28.,14. };
716 Float_t wsteel[4] = { .715,.18,.1,.005 };
718 Float_t aAlBe[2] = { 26.98, 9.01};
719 Float_t zAlBe[2] = { 13.00, 4.00};
720 Float_t wAlBe[2] = { 0.4, 0.6};
723 Float_t aPA[4] = {16., 14., 12., 1.};
724 Float_t zPA[4] = { 8., 7., 6., 1.};
725 Float_t wPA[4] = { 1., 1., 6., 11.};
729 Float_t aAir[4]={12.0107,14.0067,15.9994,39.948};
730 Float_t zAir[4]={6.,7.,8.,18.};
731 Float_t wAir[4]={0.000124,0.755267,0.231781,0.012827};
732 Float_t dAir = 1.20479E-3;
733 Float_t dAir1 = 1.20479E-10;
737 AliMaterial(5, "BERILLIUM$", 9.01, 4., 1.848, 35.3, 36.7);
740 AliMaterial(6, "CARBON$ ", 12.01, 6., 2.265, 18.8, 49.9);
743 AliMaterial(9, "ALUMINIUM$", 26.98, 13., 2.7, 8.9, 37.2);
746 AliMixture(15, "AIR$ ", aAir, zAir, dAir, 4, wAir);
749 AliMixture(16, "VACUUM$ ", aAir, zAir, dAir1, 4, wAir);
752 AliMixture(19, "STAINLESS STEEL$", asteel, zsteel, 7.88, 4, wsteel);
754 // reduced density steel to approximate pump getter material
755 AliMixture(20, "GETTER$", asteel, zsteel, 1.00, 4, wsteel);
758 AliMixture(21, "AlBe$", aAlBe, zAlBe, 2.07, 2, wAlBe);
761 AliMixture(22, "PA$", aPA, zPA, 1.14, -4, wPA);
765 // Defines tracking media parameters.
767 Float_t epsil = .001; // Tracking precision,
768 Float_t stemax = -0.01; // Maximum displacement for multiple scat
769 Float_t tmaxfd = -20.; // Maximum angle due to field deflection
770 Float_t deemax = -.3; // Maximum fractional energy loss, DLS
776 AliMedium(5, "BE", 5, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
779 AliMedium(6, "C", 6, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
782 AliMedium(9, "ALU", 9, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
785 AliMedium(15, "AIR", 15, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
788 AliMedium(16, "VACUUM", 16, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
791 AliMedium(19, "INOX", 19, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
794 AliMedium(20, "GETTER", 20, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
797 AliMedium(21, "AlBe" , 21, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
800 AliMedium(22, "PA" , 22, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);