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 *
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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 // Class AliMUONSt2GeometryBuilder
19 // -------------------------------
20 // MUON Station2 coarse geometry construction class.
21 // Extracted from AliMUONv1
22 // Dummy version of station 2 with the right DE id (Ch. Finck)
24 #include <TVirtualMC.h>
25 #include <TGeoMatrix.h>
30 #include "AliMUONSt2GeometryBuilder.h"
32 #include "AliMUONConstants.h"
33 #include "AliMUONGeometryModule.h"
34 #include "AliMUONGeometryEnvelopeStore.h"
37 ClassImp(AliMUONSt2GeometryBuilder)
40 //______________________________________________________________________________
41 AliMUONSt2GeometryBuilder::AliMUONSt2GeometryBuilder(AliMUON* muon)
42 : AliMUONVGeometryBuilder(2, 2),
45 /// Standard constructor
49 //______________________________________________________________________________
50 AliMUONSt2GeometryBuilder::AliMUONSt2GeometryBuilder()
51 : AliMUONVGeometryBuilder(),
54 /// Default constructor
58 //______________________________________________________________________________
59 AliMUONSt2GeometryBuilder::~AliMUONSt2GeometryBuilder()
68 //______________________________________________________________________________
69 void AliMUONSt2GeometryBuilder::CreateGeometry()
71 /// From AliMUONv1::CreateGeometry()
74 //********************************************************************
76 //********************************************************************
77 // indices 1 and 2 for first and second chambers in the station
78 // iChamber (first chamber) kept for other quanties than Z,
79 // assumed to be the same in both chambers
81 // Get tracking medias Ids
82 Int_t *idtmed = fMUON->GetIdtmed()->GetArray()-1099;
83 Int_t idAir= idtmed[1100]; // medium 1
84 // Int_t idAlu1=idtmed[1103]; // medium 4
85 // Int_t idAlu2=idtmed[1104]; // medium 5
86 Int_t idGas=idtmed[1108]; // medium 9 = Ar-CO2 gas (80%+20%)
88 const Float_t kDeltaQuad = 0.01;//2.6; dummy value til we find the good value
89 const Float_t kDeltaZ = 6.5/2.;
91 // Rotation matrices in the x-y plane
94 fMUON->AliMatrix(irot1, 90., 0., 90., 90., 0., 0.);
97 fMUON->AliMatrix(irot2, 90., 90., 90., 180., 0., 0.);
99 // Half of the total thickness of frame crosses (including DAlu)
100 // for each chamber in stations 1 and 2:
101 // 3% of X0 of composite material,
102 // but taken as Aluminium here, with same thickness in number of X0
103 // Float_t dframez = 3. * 8.9 / 100;
104 // DGas and DAlu not changed from standard values
105 // Double_t zfpos=-(iChamber->DGas()+dframez+iChamber->DAlu())/2;
106 // The same parameters are defined in builder for station 1
109 const Float_t kDGas = 0.5;
111 // 3% radiation length of aluminum (X0=8.9 cm)
112 // const Float_t kDAlu = 3.5 * 8.9 / 100.;
115 // Outer excess and inner recess for mother volume radius
116 // with respect to ROuter and RInner
117 // Float_t dframep=.001; // Value for station 3 should be 6 ...
118 // Width (RdPhi) of the frame crosses for stations 1 and 2 (cm)
119 // Float_t dframep1=.001;
120 // Float_t phi=2*TMath::Pi()/12/2;
121 // The same parameters are defined in builder for station 1 (30deg)
124 // Double_t dstation = (-iChamber2->Z()) - (-iChamber1->Z());
127 Float_t posx, posy, posz;
128 // Chamber Material represented by Alu sheet
129 tpar[0]= AliMUONConstants::Rmin(1);
130 tpar[1]= AliMUONConstants::Rmax(1);
137 gMC->Gsvolu("S03G", "TUBS", idGas, tpar, 5);
138 gMC->Gsvolu("S04G", "TUBS", idGas, tpar, 5);
147 gMC->Gsvolu("LE01", "TUBS", idAir, tpar, 5);
148 GetEnvelopes(2)->AddEnvelope("LE01", detElemId, true, TGeoTranslation(posx, posy, posz),
149 TGeoRotation("rot1",90,0,90,90,0,0) );
151 gMC->Gsvolu("LF01", "TUBS", idAir, tpar, 5);
152 GetEnvelopes(3)->AddEnvelope("LF01", detElemId, true, TGeoTranslation(posx, posy, posz),
153 TGeoRotation("rot1",90,0,90,90,0,0) );
155 gMC->Gsvolu("LE02", "TUBS", idAir, tpar, 5);
156 GetEnvelopes(2)->AddEnvelope("LE02", detElemId, true, TGeoTranslation(-posx, posy,-posz),
157 TGeoRotation("rot2",90,180,90,90,180,0) );
159 gMC->Gsvolu("LF02", "TUBS", idAir, tpar, 5);
160 GetEnvelopes(3)->AddEnvelope("LF02", detElemId, true, TGeoTranslation(-posx, posy,-posz),
161 TGeoRotation("rot2",90,180,90,90,180,0) );
163 gMC->Gsvolu("LE03", "TUBS", idAir, tpar, 5);
164 GetEnvelopes(2)->AddEnvelope("LE03", detElemId, true, TGeoTranslation(posx, -posy, -posz),
165 TGeoRotation("rot3",90,0,90,270,180,0) );
167 gMC->Gsvolu("LF03", "TUBS", idAir, tpar, 5);
168 GetEnvelopes(3)->AddEnvelope("LF03", detElemId, true, TGeoTranslation(posx, -posy, -posz),
169 TGeoRotation("rot3",90,0,90,270,180,0) );
171 gMC->Gsvolu("LE04", "TUBS", idAir, tpar, 5);
172 GetEnvelopes(2)->AddEnvelope("LE04", detElemId, true, TGeoTranslation(-posx, -posy, posz),
173 TGeoRotation("rot4",90,180,90,270,0,0) );
175 gMC->Gsvolu("LF04", "TUBS", idAir, tpar, 5);
176 GetEnvelopes(3)->AddEnvelope("LF04", detElemId, true, TGeoTranslation(-posx, -posy, posz),
177 TGeoRotation("rot4",90,180,90,270,0,0) );
179 GetEnvelopes(2)->AddEnvelopeConstituent("S03G", "LE01", 1);
180 GetEnvelopes(3)->AddEnvelopeConstituent("S04G", "LF01", 1);
182 GetEnvelopes(2)->AddEnvelopeConstituent("S03G", "LE02", 2);
183 GetEnvelopes(3)->AddEnvelopeConstituent("S04G", "LF02", 2);
185 GetEnvelopes(2)->AddEnvelopeConstituent("S03G", "LE03", 3);
186 GetEnvelopes(3)->AddEnvelopeConstituent("S04G", "LF03", 3);
188 GetEnvelopes(2)->AddEnvelopeConstituent("S03G", "LE04", 4);
189 GetEnvelopes(3)->AddEnvelopeConstituent("S04G", "LF04", 4);
192 //______________________________________________________________________________
193 void AliMUONSt2GeometryBuilder::SetTransformations()
195 /// Defines the transformations for the station2 chambers.
197 // Define chamber volumes as virtual
198 SetVolume(2, "SC03", true);
199 SetVolume(3, "SC04", true);
201 Double_t zpos1 = - AliMUONConstants::DefaultChamberZ(2);
202 SetTranslation(2, TGeoTranslation(0., 0., zpos1));
204 Double_t zpos2 = - AliMUONConstants::DefaultChamberZ(3);
205 SetTranslation(3, TGeoTranslation(0., 0., zpos2));
208 //______________________________________________________________________________
209 void AliMUONSt2GeometryBuilder::SetSensitiveVolumes()
211 /// Defines the sensitive volumes for station2 chambers.
213 GetGeometry(2)->SetSensitiveVolume("S03G");
214 GetGeometry(3)->SetSensitiveVolume("S04G");