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 //_________________________________________________________________________
19 // Base Class for PHOS description:
20 // PHOS consists of a PbWO4 calorimeter (EMCA) and a gazeous charged
21 // particles detector (CPV or PPSD).
22 // The only provided method here is CreateMaterials,
23 // which defines the materials common to all PHOS versions.
25 //*-- Author: Laurent Aphecetche & Yves Schutz (SUBATECH)
26 //////////////////////////////////////////////////////////////////////////////
28 // --- ROOT system ---
30 // --- Standard library ---
32 // --- AliRoot header files ---
40 //____________________________________________________________________________
47 //____________________________________________________________________________
48 void AliPHOS::CreateMaterials()
50 // Definitions of materials to build PHOS and associated tracking media.
51 // media number in idtmed are 699 to 798.
53 // --- The PbWO4 crystals ---
54 Float_t aX[3] = {207.19, 183.85, 16.0} ;
55 Float_t zX[3] = {82.0, 74.0, 8.0} ;
56 Float_t wX[3] = {1.0, 1.0, 4.0} ;
59 AliMixture(0, "PbWO4$", aX, zX, dX, -3, wX) ;
62 // --- The polysterene scintillator (CH) ---
63 Float_t aP[2] = {12.011, 1.00794} ;
64 Float_t zP[2] = {6.0, 1.0} ;
65 Float_t wP[2] = {1.0, 1.0} ;
68 AliMixture(1, "Polystyrene$", aP, zP, dP, -2, wP) ;
71 AliMaterial(2, "Al$", 26.98, 13., 2.7, 8.9, 999., 0, 0) ;
72 // --- Absorption length is ignored ^
74 // --- Tyvek (CnH2n) ---
75 Float_t aT[2] = {12.011, 1.00794} ;
76 Float_t zT[2] = {6.0, 1.0} ;
77 Float_t wT[2] = {1.0, 2.0} ;
80 AliMixture(3, "Tyvek$", aT, zT, dT, -2, wT) ;
82 // --- Polystyrene foam ---
83 Float_t aF[2] = {12.011, 1.00794} ;
84 Float_t zF[2] = {6.0, 1.0} ;
85 Float_t wF[2] = {1.0, 1.0} ;
88 AliMixture(4, "Foam$", aF, zF, dF, -2, wF) ;
91 Float_t aTIT[3] = {47.88, 26.98, 54.94} ;
92 Float_t zTIT[3] = {22.0, 13.0, 25.0} ;
93 Float_t wTIT[3] = {69.0, 6.0, 1.0} ;
96 AliMixture(5, "Titanium$", aTIT, zTIT, dTIT, -3, wTIT);
99 AliMaterial(6, "Si$", 28.0855, 14., 2.33, 9.36, 42.3, 0, 0) ;
103 // --- Foam thermo insulation ---
104 Float_t aTI[2] = {12.011, 1.00794} ;
105 Float_t zTI[2] = {6.0, 1.0} ;
106 Float_t wTI[2] = {1.0, 1.0} ;
109 AliMixture(7, "Thermo Insul.$", aTI, zTI, dTI, -2, wTI) ;
112 Float_t aTX[4] = {16.0, 28.09, 12.011, 1.00794} ;
113 Float_t zTX[4] = {8.0, 14.0, 6.0, 1.0} ;
114 Float_t wTX[4] = {292.0, 68.0, 462.0, 736.0} ;
117 AliMixture(8, "Textolit$", aTX, zTX, dTX, -4, wTX) ;
120 Float_t aFR[3] = {28.0855, 15.9994, 17.749} ;
121 Float_t zFR[3] = {14., 8., 8.875} ;
122 Float_t wFR[3] = {.28, .32, .4} ;
125 AliMixture(9, "FR4$", aFR, zFR, dFR, -3, wFR) ;
127 // --- The Composite Material for micromegas (so far polyetylene) ---
128 Float_t aCM[2] = {12.01, 1.} ;
129 Float_t zCM[2] = {6., 1.} ;
130 Float_t wCM[2] = {1., 2.} ;
131 Float_t dCM = 0.935 ;
133 AliMixture(10, "Compo Mat$", aCM, zCM, dCM, -2, wCM) ;
136 AliMaterial(11, "Cu$", 63.546, 29, 8.96, 1.43, 14.8, 0, 0) ;
138 // --- G10 : Printed Circuit material ---
139 Float_t aG10[4] = { 12., 1., 16., 28.} ;
140 Float_t zG10[4] = { 6., 1., 8., 14.} ;
141 Float_t wG10[4] = { .259, .288, .248, .205} ;
144 AliMixture(12, "G10$", aG10, zG10, dG10, -4, wG10);
147 AliMaterial(13, "Pb$", 207.2, 82, 11.35, 0.56, 0., 0, 0) ;
149 // --- The gas mixture ---
151 Float_t aCO[2] = {12.0, 16.0} ;
152 Float_t zCO[2] = {6.0, 8.0} ;
153 Float_t wCO[2] = {1.0, 2.0} ;
154 Float_t dCO = 0.001977 ;
156 AliMixture(14, "CO2$", aCO, zCO, dCO, -2, wCO);
159 Float_t dAr = 0.001782 ;
160 AliMaterial(15, "Ar$", 39.948, 18.0, dAr, 14.0, 0., 0, 0) ;
169 Float_t absL, radL, density ;
173 gMC->Gfmate((*fIdmate)[15], namate, aGM[0], zGM[0], density, radL, absL, buf, nbuf) ; // Get properties of Ar
174 gMC->Gfmate((*fIdmate)[14], namate, aGM[1], zGM[1], density, radL, absL, buf, nbuf) ; // Get properties of CO2
177 // Create gas mixture
179 Float_t arContent = 0.80 ; // Ar-content of the Ar/CO2-mixture (80% / 20%)
182 wGM[1] = 1. - arContent ;
183 dGM = wGM[0] * dAr + wGM[1] * dCO;
185 AliMixture(16, "ArCO2$", aGM, zGM, dGM, 2, wGM) ;
189 AliMaterial(99, "Air$", 14.61, 7.3, 0.001205, 30420., 67500., 0, 0) ;
192 // DEFINITION OF THE TRACKING MEDIA
194 // for PHOS: idtmed[699->798] equivalent to fIdtmed[0->100]
195 Int_t * idtmed = fIdtmed->GetArray() - 699 ;
196 Int_t isxfld = gAlice->Field()->Integ() ;
197 Float_t sxmgmx = gAlice->Field()->Max() ;
199 // The scintillator of the calorimeter made of PBW04 -> idtmed[699]
200 AliMedium(0, "PHOS Xtal $", 0, 1,
201 isxfld, sxmgmx, 10.0, 0.1, 0.1, 0.1, 0.1, 0, 0) ;
203 // The scintillator of the CPV made of Polystyrene scintillator -> idtmed[700]
204 AliMedium(1, "CPV scint. $", 1, 1,
205 isxfld, sxmgmx, 10.0, 0.1, 0.1, 0.1, 0.1, 0, 0) ;
207 // Various Aluminium parts made of Al -> idtmed[701]
208 AliMedium(2, "Al parts $", 2, 0,
209 isxfld, sxmgmx, 10.0, 0.1, 0.1, 0.001, 0.001, 0, 0) ;
211 // The Tywek which wraps the calorimeter crystals -> idtmed[702]
212 AliMedium(3, "Tyvek wrapper$", 3, 0,
213 isxfld, sxmgmx, 10.0, 0.1, 0.1, 0.001, 0.001, 0, 0) ;
215 // The Polystyrene foam around the calorimeter module -> idtmed[703]
216 AliMedium(4, "Polyst. foam $", 4, 0,
217 isxfld, sxmgmx, 10.0, 0.1, 0.1, 0.1, 0.1, 0, 0) ;
219 // The Titanium around the calorimeter crystal -> idtmed[704]
220 AliMedium(5, "Titan. cover $", 5, 0,
221 isxfld, sxmgmx, 10.0, 0.1, 0.1, 0.0001, 0.0001, 0, 0) ;
223 // The Silicon of the pin diode to read out the calorimeter crystal -> idtmed[705]
224 AliMedium(6, "Si PIN $", 6, 0,
225 isxfld, sxmgmx, 10.0, 0.1, 0.1, 0.01, 0.01, 0, 0) ;
227 // The thermo insulating material of the box which contains the calorimeter module -> idtmed[706]
228 AliMedium(7, "Thermo Insul.$", 7, 0,
229 isxfld, sxmgmx, 10.0, 0.1, 0.1, 0.1, 0.1, 0, 0) ;
231 // The Textolit which makes up the box which contains the calorimeter module -> idtmed[707]
232 AliMedium(8, "Textolit $", 8, 0,
233 isxfld, sxmgmx, 10.0, 0.1, 0.1, 0.1, 0.1, 0, 0) ;
235 // FR4: The Plastic which makes up the frame of micromegas -> idtmed[708]
236 AliMedium(9, "FR4 $", 9, 0,
237 isxfld, sxmgmx, 10.0, 0.1, 0.1, 0.1, 0.0001, 0, 0) ;
240 // The Composite Material for micromegas -> idtmed[709]
241 AliMedium(10, "CompoMat $", 10, 0,
242 isxfld, sxmgmx, 10.0, 0.1, 0.1, 0.1, 0.1, 0, 0) ;
244 // Copper -> idtmed[710]
245 AliMedium(11, "Copper $", 11, 0,
246 isxfld, sxmgmx, 10.0, 0.1, 0.1, 0.1, 0.0001, 0, 0) ;
248 // G10: Printed Circuit material -> idtmed[711]
250 AliMedium(12, "G10 $", 12, 0,
251 isxfld, sxmgmx, 10.0, 0.1, 0.1, 0.1, 0.01, 0, 0) ;
253 // The Lead -> idtmed[712]
255 AliMedium(13, "Lead $", 13, 0,
256 isxfld, sxmgmx, 10.0, 0.1, 0.1, 0.1, 0.1, 0, 0) ;
258 // The gas mixture: ArCo2 -> idtmed[715]
260 AliMedium(16, "ArCo2 $", 16, 1,
261 isxfld, sxmgmx, 10.0, 0.1, 0.1, 0.1, 0.01, 0, 0) ;
263 // Air -> idtmed[798]
264 AliMedium(99, "Air $", 99, 0,
265 isxfld, sxmgmx, 10.0, 1.0, 0.1, 0.1, 10.0, 0, 0) ;
267 // --- Set decent energy thresholds for gamma and electron tracking
269 // Tracking threshold for photons and electrons in the scintillator crystal
270 gMC->Gstpar(idtmed[699], "CUTGAM",0.5E-4) ;
271 gMC->Gstpar(idtmed[699], "CUTELE",1.0E-4) ;
273 // --- Generate explicitly delta rays in the titan cover ---
274 gMC->Gstpar(idtmed[704], "LOSS",3.) ;
275 gMC->Gstpar(idtmed[704], "DRAY",1.) ;
276 // --- and in aluminium parts ---
277 gMC->Gstpar(idtmed[701], "LOSS",3.) ;
278 gMC->Gstpar(idtmed[701], "DRAY",1.) ;
279 // --- and in PIN diode
280 gMC->Gstpar(idtmed[705], "LOSS",3) ;
281 gMC->Gstpar(idtmed[705], "DRAY",1) ;
282 // --- and in the passive convertor
283 gMC->Gstpar(idtmed[712], "LOSS",3) ;
284 gMC->Gstpar(idtmed[712], "DRAY",1) ;
285 // Tracking threshold for photons and electrons in the gas ArC02
286 gMC->Gstpar(idtmed[715], "CUTGAM",5.E-7) ;
287 gMC->Gstpar(idtmed[715], "CUTELE",5.E-7) ;
288 gMC->Gstpar(idtmed[715], "CUTNEU",5.E-7) ;
289 gMC->Gstpar(idtmed[715], "CUTHAD",5.E-7) ;
290 gMC->Gstpar(idtmed[715], "CUTMUO",5.E-7) ;
291 gMC->Gstpar(idtmed[715], "BCUTE",5.E-7) ;
292 gMC->Gstpar(idtmed[715], "BCUTM",5.E-7) ;
293 gMC->Gstpar(idtmed[715], "DCUTE",5.E-7) ;
294 gMC->Gstpar(idtmed[715], "DCUTM",5.E-7) ;
295 gMC->Gstpar(idtmed[715], "PPCUTM",5.E-7) ;
296 gMC->Gstpar(idtmed[715], "LOSS",2.) ;
297 gMC->Gstpar(idtmed[715], "DRAY",0.) ;
298 gMC->Gstpar(idtmed[715], "STRA",2.) ;