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. *
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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 **************************************************************************/
20 //_________________________________________________________________________
21 // Geometry class for PHOS : PPSD (PHOS Preshower Detector)
23 //*-- Author : Yves Schutz (SUBATECH)
24 // Modified : Yuri Kharlov (IHEP, Protvino) 15 September 2000
26 // --- ROOT system ---
28 // --- Standard library ---
32 // --- AliRoot header files ---
34 #include "AliPHOSPPSDGeometry.h"
36 ClassImp(AliPHOSPPSDGeometry) ;
38 //____________________________________________________________________________
39 AliPHOSPPSDGeometry::AliPHOSPPSDGeometry()
42 // Initializes the PPSD parameters
44 fAnodeThickness = 0.0009 ;
45 fAvalancheGap = 0.01 ;
46 fCathodeThickness = 0.0009 ;
47 fCompositeThickness = 0.3 ;
48 fConversionGap = 0.6 ;
49 fLeadConverterThickness = 0.56 ;
50 fLeadToMicro2Gap = 0.1 ;
52 fMicro1ToLeadGap = 0.1 ;
53 fMicromegasWallThickness = 0.6 ;
54 fNumberOfModulesPhi = 4 ;
55 fNumberOfModulesZ = 4 ;
56 fNumberOfPadsPhi = 24 ;
59 fPhiDisplacement = 0.8 ;
60 fZDisplacement = 0.8 ;
62 fMicromegas1Thickness = fLidThickness + 2 * fCompositeThickness + fCathodeThickness
63 + fPCThickness + fAnodeThickness + fConversionGap + fAvalancheGap ;
64 fMicromegas2Thickness = fMicromegas1Thickness ;
66 fPPSDModuleSize[0] = 38.0 ;
67 fPPSDModuleSize[1] = fMicromegas1Thickness ;
68 fPPSDModuleSize[2] = 38.0 ;
70 fPPSDBoxSize[0] = fNumberOfModulesPhi * fPPSDModuleSize[0] + 2 * fPhiDisplacement ;
71 fPPSDBoxSize[1] = fMicromegas2Thickness + fMicromegas2Thickness
72 + fLeadConverterThickness + fMicro1ToLeadGap + fLeadToMicro2Gap ;
73 fPPSDBoxSize[2] = fNumberOfModulesZ * fPPSDModuleSize[2] + 2 * fZDisplacement ;
77 //____________________________________________________________________________