[u/mrichter/AliRoot.git] / STRUCT / AliPIPEv1.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

/* $Id$ */

///////////////////////////////////////////////////////////////////////////////
//                                                                           //
//  Beam pipe class. Test version                                            //
//                                                                           //
//Begin_Html
/*
<img src="picts/AliPIPEClass.gif">
*/
//End_Html
//                                                                           //
///////////////////////////////////////////////////////////////////////////////

#include <TVirtualMC.h>

#include "AliMagF.h"
#include "AliPIPEv1.h"
#include "AliRun.h"
 
ClassImp(AliPIPEv1)
 
//_____________________________________________________________________________
AliPIPEv1::AliPIPEv1()
{
  //
  // Default constructor for beam pipe
  //
}
 
//_____________________________________________________________________________
AliPIPEv1::AliPIPEv1(const char *name, const char *title)
       : AliPIPE(name,title)
{
  //
  // Standard constructor for beam pipe
  //
}
 
//_____________________________________________________________________________
void AliPIPEv1::CreateGeometry()
{
  //
  // Create Beam Pipe geometry
  //
  //Begin_Html
  /*
    <img src="picts/AliPIPE.gif">
  */
  //End_Html
  //Begin_Html
  /*
    <img src="picts/AliPIPETree.gif">
  */
  //End_Html

  Float_t tpar[3], dzmo, zpos, absorberDistance, absorberEnd;
  Float_t r2, dr;

  const Double_t kZFlange = 150;
  
  Int_t *idtmed = fIdtmed->GetArray()-1999;
  
  
  absorberDistance   = 90.;  // DEFINES DRIFT LENGTH 
  //z_nose  = 102.;
  //z_cone  = 285.;
  //theta1  = 24.;  // 1. angle defining the front absorber 
  //theta2  = 5.;   // 2. angle defining the front absorbe 
  //acc_max = 9.;   // ANGLE POLAIRE MAXIMUM 
  //acc_min = 2.;   // ANGLE POLAIRE MINIMUM DE DETECTION 
  absorberEnd   = 503.;
  //d_steel = 1.;   // THICKNESS OF STEEL SUPPORT 
  //d_poly  = 7.5;
  //d_pb    = 2.5;
  //abs_cc  = 315.; // DEFINES LENGTH OF CARBON 
  //abs_c   = 358.;
  //abs_s   = 150.; // DEFINES W-SHIELD LENGTH 
  //abs_n   = 80.;  // START OF NOSE 
  //r_abs   = 4.;
  //r_pb    = .1;
  //epsilon = .01;
  //theta_r = 3.;
  //d_rear  = 35.;
  //theta_open = .75;
  
  //z_l3      = 700.;
  //zmag_in   = 725.;
  //zmag_out  = 1225.;
  //zfil_in   = 1471.;
  //zfil_out  = 1591.;
  //zcon_in   = 1900.;
  //zcon_out  = 2e3;
  //zcone_e   = 859.0875;
  //spec_l    = 1800.;
  //zplug_in  = 1780.;
  //zplug_out = 1900.;
  
  //     Chamber position 
  //      CZ1=515.5 
  //cz1 = 511.;
  //cz2 = 686.;
  //cz3 = 971.;
  //cz4 = 1245.;
  //cz5 = 1445.;
  //cz6 = 1610.;
  //cz7 = 1710.;
  
  
  //     the mother of all beam pipes 
  
  tpar[0] = 0.;
  tpar[1] = 3.;
  tpar[2] = (absorberDistance + 700.) / 2.;
  dzmo = tpar[2] - absorberDistance;
  gMC->Gsvolu("QQMO", "TUBE", idtmed[2015], tpar, 3);
  gMC->Gspos("QQMO", 1, "ALIC", 0., 0., -dzmo, 0, "ONLY");
  
  //       BEAM PIPE IN DRIFT SPACE 
  
  //     -30-kZFlange 
  tpar[0] = 0.;
  tpar[1] = 3.;
  tpar[2] = 30;
  gMC->Gsvolu("QDT1", "TUBE", idtmed[2015], tpar, 3);
  
  tpar[0] = 2.9;
  gMC->Gsvolu("QTB1", "TUBE", idtmed[2004], tpar, 3);
  gMC->Gspos("QTB1", 1, "QDT1", 0., 0., 0., 0, "ONLY");
  gMC->Gspos("QDT1", 1, "QQMO", 0., 0., dzmo, 0, "ONLY");
  
  
  //     30-90 
  tpar[0] = 0.;
  tpar[1] = 3.;
  tpar[2] = 30.;
  gMC->Gsvolu("QDT2", "TUBE", idtmed[2015], tpar, 3);
  
  tpar[0] = 2.9;
  gMC->Gsvolu("QTB2", "TUBE", idtmed[2004], tpar, 3);
  gMC->Gspos("QTB2", 1, "QDT2", 0., 0., 0.,   0, "ONLY");
  gMC->Gspos("QDT2", 1, "QQMO", 0., 0., dzmo, 0, "ONLY");
  
  //       beam pipe outside absorber on the left side 
  
  
  
  //     -30 - kZFlange 
  tpar[0] = 0.;
  tpar[1] = 3.;
  tpar[2] = (kZFlange - 30)/2;
  gMC->Gsvolu("QDT5", "TUBE", idtmed[2015], tpar, 3);
  
  tpar[0] = 2.9;
  zpos    = -30. - tpar[2] + dzmo;
  gMC->Gsvolu("QTB5", "TUBE", idtmed[2004], tpar, 3);
  gMC->Gspos("QTB5", 1, "QDT5", 0., 0., 0.,   0, "ONLY");
  gMC->Gspos("QDT5", 1, "QQMO", 0., 0., zpos, 0, "ONLY");
  
  //     STRAIGHT STEEL PIECE 
  
  zpos    = -kZFlange;
  r2      = 2.9;
  dr      = .015;
  tpar[0] = 0.;
  tpar[1] = r2 + dr;
  tpar[2] = (zpos + 700.) / 2.;
  gMC->Gsvolu("QDT7", "TUBE", idtmed[2015], tpar, 3);
  tpar[0] = r2;
  gMC->Gsvolu("QTB7", "TUBE", idtmed[2018], tpar, 3);
  gMC->Gspos("QTB7", 1, "QDT7", 0., 0., 0.,   0, "ONLY");
  zpos = zpos - tpar[2] + dzmo;
  gMC->Gspos("QDT7", 1, "QQMO", 0., 0., zpos, 0, "ONLY");
  
  //     flange dn 63 
  
  tpar[0] = 3.;
  tpar[1] = 5.7;
  tpar[2] = 2.;
  gMC->Gsvolu("QN63", "TUBE", idtmed[2018], tpar, 3);
  zpos = tpar[2] - kZFlange;
  gMC->Gspos("QN63", 1, "ALIC", 0., 0., zpos, 0, "ONLY");
  
  
  //     Replace Absorber or Shield by Beam-Pipe 
  //     in case they are not selected 
  
  if (gAlice->GetModule("ABSO") == 0) {
    
    gMC->Gspos("QN63", 2, "ALIC", 0., 0., kZFlange, 0, "ONLY");
    r2      = 2.9;
    dr      = .1;
    tpar[0] = 0.;
    tpar[1] = r2 + dr;
    tpar[2] = (kZFlange - absorberDistance) / 2.;
    gMC->Gsvolu("QDT8", "TUBE", idtmed[2015], tpar, 3);
    tpar[0] = r2;
    gMC->Gsvolu("QTB8", "TUBE", idtmed[2004], tpar, 3);
    gMC->Gspos("QTB8", 1, "QDT8", 0., 0., 0., 0, "ONLY");
    zpos    = absorberDistance + tpar[2];
    gMC->Gspos("QDT8", 1, "ALIC", 0., 0., zpos, 0, "ONLY");
    dr      = .015;
    tpar[0] = 0.;
    tpar[1] = r2 + dr;
    tpar[2] = (absorberEnd - kZFlange) / 2.;
    gMC->Gsvolu("QDTS", "TUBE", idtmed[2015], tpar, 3);
    tpar[0] = r2;
    gMC->Gsvolu("QTBS", "TUBE", idtmed[2018], tpar, 3);
    gMC->Gspos("QTBS", 1, "QDTS", 0., 0., 0., 0, "ONLY");
    zpos = tpar[2] + kZFlange;
    gMC->Gspos("QDTS", 1, "ALIC", 0., 0., zpos, 0, "ONLY");
  }
  if (gAlice->GetModule("SHIL") == 0) {
    r2      = 2.9;
    dr      = .015;
    tpar[0] = 0.;
    tpar[1] = r2 + dr;
    tpar[2] = (700. - absorberEnd) / 2.;
    gMC->Gsvolu("QDT9", "TUBE", idtmed[2015], tpar, 3);
    tpar[0] = r2;
    gMC->Gsvolu("QTB9", "TUBE", idtmed[2018], tpar, 3);
    gMC->Gspos("QTB9", 1, "QDT9", 0., 0., 0., 0, "ONLY");
    zpos = absorberEnd + tpar[2];
    gMC->Gspos("QDT9", 1, "ALIC", 0., 0., zpos, 0, "ONLY");
  }
}

//_____________________________________________________________________________
void AliPIPEv1::CreateMaterials()
{
  //
  // Create materials for beam pipe
  //

  Int_t   isxfld = ((AliMagF*)TGeoGlobalMagField::Instance()->GetField())->Integ();
  Float_t sxmgmx = ((AliMagF*)TGeoGlobalMagField::Instance()->GetField())->Max();
  
  Float_t asteel[4] = { 55.847,51.9961,58.6934,28.0855 };
  Float_t zsteel[4] = { 26.,24.,28.,14. };
  Float_t wsteel[4] = { .715,.18,.1,.005 };
  
  Float_t epsil, stmin, tmaxfd, deemax, stemax;
  
  //     STEEL 
  
  
  // --- Define the various materials for GEANT --- 
  AliMaterial(5, "BERILLIUM$", 9.01, 4., 1.848, 35.3, 36.7);
  AliMaterial(16, "VACUUM$ ", 1e-16, 1e-16, 1e-16, 1e16, 1e16);
  AliMaterial(15, "AIR$      ", 14.61, 7.3, .001205, 30423.24, 67500);
  AliMixture(19, "STAINLESS STEEL$", asteel, zsteel, 7.88, 4, wsteel);
  
  // **************** 
  //     Defines tracking media parameters. 
  //     Les valeurs sont commentees pour laisser le defaut 
  //     a GEANT (version 3-21, page CONS200), f.m. 
  epsil  = .001;  // Tracking precision, 
  stemax = -1.;   // Maximum displacement for multiple scat 
  tmaxfd = -20.;  // Maximum angle due to field deflection 
  deemax = -.3;   // Maximum fractional energy loss, DLS 
  stmin  = -.8;
  
  //    Air 
  
  AliMedium(15, "AIR_L3_US", 15, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
  
  //    Beryllium 
  
  AliMedium(5, "BE_L3_US", 5, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
  
  //    Vacuum 
  
  AliMedium(16, "VA_L3_US", 16, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
  
  //    Steel 
  
  AliMedium(19, "ST_L3_US", 19, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
}
Commit	Line	Data
4c039060	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	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	**************************************************************************/
	15
eeacf08b	16	/* $Id$ */
4c039060	17
fe4da5cc	18	///////////////////////////////////////////////////////////////////////////////
fe4da5cc	19	// //
eeacf08b	20	// Beam pipe class. Test version //
fe4da5cc	21	// //
	22	//Begin_Html
	23	/*
1439f98e	24	<img src="picts/AliPIPEClass.gif">
fe4da5cc	25	*/
	26	//End_Html
	27	// //
	28	///////////////////////////////////////////////////////////////////////////////
	29
88cb7938	30	#include <TVirtualMC.h>
	31
	32	#include "AliMagF.h"
fe4da5cc	33	#include "AliPIPEv1.h"
fe4da5cc	34	#include "AliRun.h"
fe4da5cc	35
	36	ClassImp(AliPIPEv1)
	37
	38	//_____________________________________________________________________________
b8032157	39	AliPIPEv1::AliPIPEv1()
fe4da5cc	40	{
	41	//
	42	// Default constructor for beam pipe
	43	//
	44	}
	45
	46	//_____________________________________________________________________________
	47	AliPIPEv1::AliPIPEv1(const char name, const char title)
	48	: AliPIPE(name,title)
	49	{
	50	//
	51	// Standard constructor for beam pipe
	52	//
	53	}
	54
	55	//_____________________________________________________________________________
	56	void AliPIPEv1::CreateGeometry()
	57	{
	58	//
	59	// Create Beam Pipe geometry
	60	//
	61	//Begin_Html
	62	/*
1439f98e	63	<img src="picts/AliPIPE.gif">
fe4da5cc	64	*/
	65	//End_Html
	66	//Begin_Html
	67	/*
1439f98e	68	<img src="picts/AliPIPETree.gif">
fe4da5cc	69	*/
	70	//End_Html
	71
b43eb0dc	72	Float_t tpar[3], dzmo, zpos, absorberDistance, absorberEnd;
fe4da5cc	73	Float_t r2, dr;
fe4da5cc	74
b43eb0dc	75	const Double_t kZFlange = 150;
fe4da5cc	76
ad51aeb0	77	Int_t *idtmed = fIdtmed->GetArray()-1999;
fe4da5cc	78
fe4da5cc	79
b43eb0dc	80	absorberDistance = 90.; // DEFINES DRIFT LENGTH
fe4da5cc	81	//z_nose = 102.;
	82	//z_cone = 285.;
	83	//theta1 = 24.; // 1. angle defining the front absorber
	84	//theta2 = 5.; // 2. angle defining the front absorbe
	85	//acc_max = 9.; // ANGLE POLAIRE MAXIMUM
	86	//acc_min = 2.; // ANGLE POLAIRE MINIMUM DE DETECTION
b43eb0dc	87	absorberEnd = 503.;
fe4da5cc	88	//d_steel = 1.; // THICKNESS OF STEEL SUPPORT
	89	//d_poly = 7.5;
	90	//d_pb = 2.5;
	91	//abs_cc = 315.; // DEFINES LENGTH OF CARBON
	92	//abs_c = 358.;
	93	//abs_s = 150.; // DEFINES W-SHIELD LENGTH
	94	//abs_n = 80.; // START OF NOSE
	95	//r_abs = 4.;
	96	//r_pb = .1;
	97	//epsilon = .01;
	98	//theta_r = 3.;
	99	//d_rear = 35.;
	100	//theta_open = .75;
	101
	102	//z_l3 = 700.;
	103	//zmag_in = 725.;
	104	//zmag_out = 1225.;
	105	//zfil_in = 1471.;
	106	//zfil_out = 1591.;
	107	//zcon_in = 1900.;
	108	//zcon_out = 2e3;
	109	//zcone_e = 859.0875;
	110	//spec_l = 1800.;
	111	//zplug_in = 1780.;
	112	//zplug_out = 1900.;
	113
	114	// Chamber position
	115	// CZ1=515.5
	116	//cz1 = 511.;
	117	//cz2 = 686.;
	118	//cz3 = 971.;
	119	//cz4 = 1245.;
	120	//cz5 = 1445.;
	121	//cz6 = 1610.;
	122	//cz7 = 1710.;
	123
	124
	125	// the mother of all beam pipes
	126
	127	tpar[0] = 0.;
	128	tpar[1] = 3.;
b43eb0dc	129	tpar[2] = (absorberDistance + 700.) / 2.;
b43eb0dc	130	dzmo = tpar[2] - absorberDistance;
cfce8870	131	gMC->Gsvolu("QQMO", "TUBE", idtmed[2015], tpar, 3);
cfce8870	132	gMC->Gspos("QQMO", 1, "ALIC", 0., 0., -dzmo, 0, "ONLY");
fe4da5cc	133
	134	// BEAM PIPE IN DRIFT SPACE
	135
b43eb0dc	136	// -30-kZFlange
fe4da5cc	137	tpar[0] = 0.;
	138	tpar[1] = 3.;
	139	tpar[2] = 30;
cfce8870	140	gMC->Gsvolu("QDT1", "TUBE", idtmed[2015], tpar, 3);
fe4da5cc	141
fe4da5cc	142	tpar[0] = 2.9;
cfce8870	143	gMC->Gsvolu("QTB1", "TUBE", idtmed[2004], tpar, 3);
	144	gMC->Gspos("QTB1", 1, "QDT1", 0., 0., 0., 0, "ONLY");
	145	gMC->Gspos("QDT1", 1, "QQMO", 0., 0., dzmo, 0, "ONLY");
fe4da5cc	146
	147
	148	// 30-90
	149	tpar[0] = 0.;
	150	tpar[1] = 3.;
	151	tpar[2] = 30.;
cfce8870	152	gMC->Gsvolu("QDT2", "TUBE", idtmed[2015], tpar, 3);
fe4da5cc	153
fe4da5cc	154	tpar[0] = 2.9;
cfce8870	155	gMC->Gsvolu("QTB2", "TUBE", idtmed[2004], tpar, 3);
	156	gMC->Gspos("QTB2", 1, "QDT2", 0., 0., 0., 0, "ONLY");
	157	gMC->Gspos("QDT2", 1, "QQMO", 0., 0., dzmo, 0, "ONLY");
fe4da5cc	158
	159	// beam pipe outside absorber on the left side
	160
	161
	162
b43eb0dc	163	// -30 - kZFlange
fe4da5cc	164	tpar[0] = 0.;
fe4da5cc	165	tpar[1] = 3.;
b43eb0dc	166	tpar[2] = (kZFlange - 30)/2;
cfce8870	167	gMC->Gsvolu("QDT5", "TUBE", idtmed[2015], tpar, 3);
fe4da5cc	168
	169	tpar[0] = 2.9;
	170	zpos = -30. - tpar[2] + dzmo;
cfce8870	171	gMC->Gsvolu("QTB5", "TUBE", idtmed[2004], tpar, 3);
	172	gMC->Gspos("QTB5", 1, "QDT5", 0., 0., 0., 0, "ONLY");
	173	gMC->Gspos("QDT5", 1, "QQMO", 0., 0., zpos, 0, "ONLY");
fe4da5cc	174
	175	// STRAIGHT STEEL PIECE
	176
b43eb0dc	177	zpos = -kZFlange;
fe4da5cc	178	r2 = 2.9;
	179	dr = .015;
	180	tpar[0] = 0.;
	181	tpar[1] = r2 + dr;
	182	tpar[2] = (zpos + 700.) / 2.;
cfce8870	183	gMC->Gsvolu("QDT7", "TUBE", idtmed[2015], tpar, 3);
fe4da5cc	184	tpar[0] = r2;
cfce8870	185	gMC->Gsvolu("QTB7", "TUBE", idtmed[2018], tpar, 3);
cfce8870	186	gMC->Gspos("QTB7", 1, "QDT7", 0., 0., 0., 0, "ONLY");
fe4da5cc	187	zpos = zpos - tpar[2] + dzmo;
cfce8870	188	gMC->Gspos("QDT7", 1, "QQMO", 0., 0., zpos, 0, "ONLY");
fe4da5cc	189
	190	// flange dn 63
	191
	192	tpar[0] = 3.;
	193	tpar[1] = 5.7;
	194	tpar[2] = 2.;
cfce8870	195	gMC->Gsvolu("QN63", "TUBE", idtmed[2018], tpar, 3);
b43eb0dc	196	zpos = tpar[2] - kZFlange;
cfce8870	197	gMC->Gspos("QN63", 1, "ALIC", 0., 0., zpos, 0, "ONLY");
fe4da5cc	198
	199
	200	// Replace Absorber or Shield by Beam-Pipe
	201	// in case they are not selected
	202
b8032157	203	if (gAlice->GetModule("ABSO") == 0) {
fe4da5cc	204
b43eb0dc	205	gMC->Gspos("QN63", 2, "ALIC", 0., 0., kZFlange, 0, "ONLY");
fe4da5cc	206	r2 = 2.9;
	207	dr = .1;
	208	tpar[0] = 0.;
	209	tpar[1] = r2 + dr;
b43eb0dc	210	tpar[2] = (kZFlange - absorberDistance) / 2.;
cfce8870	211	gMC->Gsvolu("QDT8", "TUBE", idtmed[2015], tpar, 3);
fe4da5cc	212	tpar[0] = r2;
cfce8870	213	gMC->Gsvolu("QTB8", "TUBE", idtmed[2004], tpar, 3);
cfce8870	214	gMC->Gspos("QTB8", 1, "QDT8", 0., 0., 0., 0, "ONLY");
b43eb0dc	215	zpos = absorberDistance + tpar[2];
cfce8870	216	gMC->Gspos("QDT8", 1, "ALIC", 0., 0., zpos, 0, "ONLY");
fe4da5cc	217	dr = .015;
	218	tpar[0] = 0.;
	219	tpar[1] = r2 + dr;
b43eb0dc	220	tpar[2] = (absorberEnd - kZFlange) / 2.;
cfce8870	221	gMC->Gsvolu("QDTS", "TUBE", idtmed[2015], tpar, 3);
fe4da5cc	222	tpar[0] = r2;
cfce8870	223	gMC->Gsvolu("QTBS", "TUBE", idtmed[2018], tpar, 3);
cfce8870	224	gMC->Gspos("QTBS", 1, "QDTS", 0., 0., 0., 0, "ONLY");
b43eb0dc	225	zpos = tpar[2] + kZFlange;
cfce8870	226	gMC->Gspos("QDTS", 1, "ALIC", 0., 0., zpos, 0, "ONLY");
fe4da5cc	227	}
b8032157	228	if (gAlice->GetModule("SHIL") == 0) {
fe4da5cc	229	r2 = 2.9;
	230	dr = .015;
	231	tpar[0] = 0.;
	232	tpar[1] = r2 + dr;
b43eb0dc	233	tpar[2] = (700. - absorberEnd) / 2.;
cfce8870	234	gMC->Gsvolu("QDT9", "TUBE", idtmed[2015], tpar, 3);
fe4da5cc	235	tpar[0] = r2;
cfce8870	236	gMC->Gsvolu("QTB9", "TUBE", idtmed[2018], tpar, 3);
cfce8870	237	gMC->Gspos("QTB9", 1, "QDT9", 0., 0., 0., 0, "ONLY");
b43eb0dc	238	zpos = absorberEnd + tpar[2];
cfce8870	239	gMC->Gspos("QDT9", 1, "ALIC", 0., 0., zpos, 0, "ONLY");
fe4da5cc	240	}
	241	}
	242
fe4da5cc	243	//_____________________________________________________________________________
	244	void AliPIPEv1::CreateMaterials()
	245	{
	246	//
	247	// Create materials for beam pipe
	248	//
	249
f7a1cc68	250	Int_t isxfld = ((AliMagF*)TGeoGlobalMagField::Instance()->GetField())->Integ();
f7a1cc68	251	Float_t sxmgmx = ((AliMagF*)TGeoGlobalMagField::Instance()->GetField())->Max();
fe4da5cc	252
	253	Float_t asteel[4] = { 55.847,51.9961,58.6934,28.0855 };
	254	Float_t zsteel[4] = { 26.,24.,28.,14. };
	255	Float_t wsteel[4] = { .715,.18,.1,.005 };
	256
	257	Float_t epsil, stmin, tmaxfd, deemax, stemax;
	258
	259	// STEEL
	260
	261
	262	// --- Define the various materials for GEANT ---
	263	AliMaterial(5, "BERILLIUM$", 9.01, 4., 1.848, 35.3, 36.7);
	264	AliMaterial(16, "VACUUM$ ", 1e-16, 1e-16, 1e-16, 1e16, 1e16);
	265	AliMaterial(15, "AIR$ ", 14.61, 7.3, .001205, 30423.24, 67500);
	266	AliMixture(19, "STAINLESS STEEL$", asteel, zsteel, 7.88, 4, wsteel);
	267
	268	// ****************
	269	// Defines tracking media parameters.
	270	// Les valeurs sont commentees pour laisser le defaut
	271	// a GEANT (version 3-21, page CONS200), f.m.
	272	epsil = .001; // Tracking precision,
	273	stemax = -1.; // Maximum displacement for multiple scat
	274	tmaxfd = -20.; // Maximum angle due to field deflection
	275	deemax = -.3; // Maximum fractional energy loss, DLS
	276	stmin = -.8;
	277
	278	// Air
	279
b43eb0dc	280	AliMedium(15, "AIR_L3_US", 15, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
fe4da5cc	281
	282	// Beryllium
	283
b43eb0dc	284	AliMedium(5, "BE_L3_US", 5, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
fe4da5cc	285
	286	// Vacuum
	287
b43eb0dc	288	AliMedium(16, "VA_L3_US", 16, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
fe4da5cc	289
	290	// Steel
	291
b43eb0dc	292	AliMedium(19, "ST_L3_US", 19, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
fe4da5cc	293	}
fe4da5cc	294