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f665c1ea | 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 | ||
88cb7938 | 16 | /* $Id$ */ |
f665c1ea | 17 | |
18 | #include "AliMUONConstants.h" | |
19 | ||
fe126bce | 20 | #include "AliLog.h" |
21 | ||
9d5f6a64 | 22 | #include "TMath.h" |
fe126bce | 23 | #include "TClass.h" |
9d5f6a64 | 24 | |
25 | /// | |
26 | /// This class holds various constants to be used in many places, | |
27 | /// such as the number of tracking and trigger chambers, | |
28 | /// some geometrical constants (to build the initial geometry for simulation) | |
29 | /// and mathieson distribution default values. | |
30 | /// Those constants should as much as possible replace hard-coded values | |
31 | /// which are to be considered strictly illegal in the MUON code (or any code, | |
32 | /// by the way). | |
33 | /// | |
f665c1ea | 34 | |
5398f946 | 35 | /// \cond CLASSIMP |
36 | ClassImp(AliMUONConstants) | |
37 | /// \endcond | |
38 | ||
37c0cd40 | 39 | Int_t AliMUONConstants::fgNCh = 14; |
f665c1ea | 40 | Int_t AliMUONConstants::fgNTrackingCh = 10; |
de2cd600 | 41 | Int_t AliMUONConstants::fgNTrackingSt = 5; |
f665c1ea | 42 | Int_t AliMUONConstants::fgNTriggerCh = 4; |
43 | Int_t AliMUONConstants::fgNTriggerCircuit = 234; | |
edb96c6a | 44 | Int_t AliMUONConstants::fgNDetElem = 228; |
573dc4ee | 45 | Int_t AliMUONConstants::fgNGeomModules = 20; |
b717b957 | 46 | Float_t AliMUONConstants::fgkTriggerTofLimit = 75E-9; |
89b0b88d | 47 | |
e516b01d | 48 | Float_t AliMUONConstants::fgDefaultChamberZ[14] = |
89b0b88d | 49 | {-526.16, -545.24, -676.4, -695.4, // St12 |
50 | -967.5, -998.5, -1276.5, -1307.5, -1406.6, -1437.6,// updated 08/05, EDMS id 335328 (A. Tournaire) | |
e516b01d | 51 | -1603.5, -1620.5, -1703.5, -1720.5}; // M1 & M2 |
52 | ||
43adb63d | 53 | Float_t AliMUONConstants::fgDefaultRatioTriggerChamber[4] = |
54 | {1., 1.01060, 1.06236, 1.07296}; | |
55 | ||
56 | ||
2c9844e7 | 57 | Float_t AliMUONConstants::fgSt345inclination = 0.794; // in degrees, rotation axis is X axis |
58 | ||
e516b01d | 59 | Float_t AliMUONConstants::fgDzCh = 15.5/2.; |
60 | Float_t AliMUONConstants::fgDzSlat = 8.5/2.; | |
61 | ||
1c334adf | 62 | Float_t AliMUONConstants::fgSqrtKx3 = 0.7131; |
63 | Float_t AliMUONConstants::fgSqrtKy3 = 0.7642; | |
7e4a628d | 64 | |
1c334adf | 65 | Float_t AliMUONConstants::fgSqrtKx3St1 = 0.7000; |
66 | Float_t AliMUONConstants::fgSqrtKy3St1 = 0.7550; | |
7e4a628d | 67 | |
1c334adf | 68 | Float_t AliMUONConstants::fgChargeCorrel = 0.11; |
f4a7360f | 69 | Float_t AliMUONConstants::fgChargeCorrelSt1 = 1.0; //??? |
1c334adf | 70 | Float_t AliMUONConstants::fgPitch = 0.25; |
71 | Float_t AliMUONConstants::fgPitchSt1 = 0.21; | |
c47b11f0 | 72 | |
f4a7360f | 73 | // From Alain TOURNAIRE |
74 | // ALICE / ALICE Engineering baseline / Dimuonspectrometer (DIS) v7-1 | |
75 | // EDMS Id 335328 for "search in EDMS | |
124dd59f | 76 | // These are the diameter (Dmin == innner and Dmax - outner) values of the active surface |
77 | // In the case of Dmax, the value corresponds to the maximum diameter of the active surface with 2pi coverture in phi | |
78 | Float_t AliMUONConstants::fgDmin[7] = { 36.4, 46.2, 63.0, 79.0, 79.0, 99.0, 100.0}; // cm | |
79 | Float_t AliMUONConstants::fgDmax[7] = { 176.6, 229.0, 308.84, 418.2, 522.0, 850.0, 900.0}; // cm | |
f4a7360f | 80 | |
e118b27e | 81 | Int_t AliMUONConstants::fgMaxZoom = 20; |
ecfa008b | 82 | |
de2cd600 | 83 | // Defaults parameters for track reconstruction |
84 | Double_t AliMUONConstants::fgDefaultChamberThicknessInX0 = 0.03; | |
85 | ||
24c9eaa0 | 86 | //______________________________________________________________________________ |
29fc2c86 | 87 | Int_t AliMUONConstants::ChamberNumber(Float_t z) |
88 | { | |
89 | // return chamber number according z position of hit. Should be taken from geometry ? | |
90 | ||
91 | Float_t dMaxChamber = DzSlat() + DzCh() + 0.25; // cm st 3 &4 & 5 | |
fe126bce | 92 | dMaxChamber += 3.00; // factor for inclination of chamber |
93 | // dMaxChamber += Rmax(4) * TMath::Sin(fgSt345inclination*TMath::Pi()/360.); | |
94 | // factor for inclination of chamber | |
29fc2c86 | 95 | if ( z > (DefaultChamberZ(4)+50.)) dMaxChamber = 7.; // cm stations 1 & 2 |
96 | Int_t iChamber; | |
97 | ||
98 | for (iChamber = 0; iChamber < 10; iChamber++) { | |
29fc2c86 | 99 | if (TMath::Abs(z-DefaultChamberZ(iChamber)) < dMaxChamber) { |
100 | return iChamber; | |
101 | } | |
102 | } | |
fe126bce | 103 | |
104 | if ( z > DefaultChamberZ(NTrackingCh()-1) ) { | |
105 | AliWarningClass(Form("No chamber number found for z = %f",z)); | |
106 | // for (iChamber = 0; iChamber < 10; iChamber++) { | |
107 | // cout << iChamber << " zpos: " << DefaultChamberZ(iChamber) | |
108 | // << " from " << DefaultChamberZ(iChamber) + dMaxChamber | |
109 | // << " to " << DefaultChamberZ(iChamber) - dMaxChamber | |
110 | // << " delta " << dMaxChamber << endl; | |
111 | //} | |
112 | } | |
29fc2c86 | 113 | return -1; |
114 | } |