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5e86ff99 | 1 | #include <stdio.h> |
2 | ||
3 | #include "TMath.h" | |
4 | ||
5 | #include "AliTRDltuParam.h" | |
6 | ||
7 | // definition of geometry constants | |
8 | Float_t AliTRDltuParam::fgZrow[6][5] = { | |
9 | {301, 177, 53, -57, -181}, | |
10 | {301, 177, 53, -57, -181}, | |
11 | {315, 184, 53, -57, -188}, | |
12 | {329, 191, 53, -57, -195}, | |
13 | {343, 198, 53, -57, -202}, | |
14 | {347, 200, 53, -57, -204}}; | |
15 | Float_t AliTRDltuParam::fgX[6] = | |
16 | {300.65, 313.25, 325.85, 338.45, 351.05, 363.65}; | |
17 | Float_t AliTRDltuParam::fgTiltingAngle[6] = | |
18 | {-2., 2., -2., 2., -2., 2.}; | |
19 | Int_t AliTRDltuParam::fgDyMax = 63; | |
20 | Int_t AliTRDltuParam::fgDyMin = -64; | |
21 | Float_t AliTRDltuParam::fgBinDy = 140e-6; | |
22 | Float_t AliTRDltuParam::fgWidthPad[6] = | |
23 | {0.635, 0.665, 0.695, 0.725, 0.755, 0.785}; | |
24 | Float_t AliTRDltuParam::fgLengthInnerPadC1[6] = | |
25 | {7.5, 7.5, 8.0, 8.5, 9.0, 9.0}; | |
26 | Float_t AliTRDltuParam::fgLengthOuterPadC1[6] = | |
27 | {7.5, 7.5, 7.5, 7.5, 7.5, 8.5}; | |
28 | Float_t AliTRDltuParam::fgLengthInnerPadC0 = 9.0; | |
29 | Float_t AliTRDltuParam::fgLengthOuterPadC0 = 8.0; | |
30 | Float_t AliTRDltuParam::fgScalePad = 256. * 32.; | |
918cceaa | 31 | Float_t AliTRDltuParam::fgDriftLength = 3.; |
5e86ff99 | 32 | |
33 | AliTRDltuParam::AliTRDltuParam() : | |
34 | TObject(), | |
35 | fMagField(0.), | |
36 | fOmegaTau(0.), | |
37 | fPtMin(0.1), | |
38 | fNtimebins(20 << 5), | |
51380642 | 39 | fScaleQ0(0), |
40 | fScaleQ1(0), | |
5e86ff99 | 41 | fPidTracklengthCorr(kFALSE), |
42 | fTiltCorr(kFALSE) | |
43 | { | |
44 | ||
45 | } | |
46 | ||
47 | AliTRDltuParam::~AliTRDltuParam() | |
48 | { | |
49 | ||
50 | } | |
51 | ||
52 | Int_t AliTRDltuParam::GetDyCorrection(Int_t det, Int_t rob, Int_t mcm) const | |
53 | { | |
54 | // calculate the correction of the deflection | |
55 | // i.e. Lorentz angle and tilt correction (if active) | |
56 | ||
57 | Int_t layer = det % 6; | |
58 | ||
16477104 | 59 | Float_t dyTilt = ( fgDriftLength * TMath::Tan(fgTiltingAngle[layer] * TMath::Pi()/180.) * |
5e86ff99 | 60 | GetLocalZ(det, rob, mcm) / fgX[layer] ); |
61 | ||
62 | // calculate Lorentz correction | |
63 | Float_t dyCorr = - fOmegaTau * fgDriftLength; | |
64 | ||
65 | if(fTiltCorr) | |
66 | dyCorr += dyTilt; // add tilt correction | |
67 | ||
68 | return (int) TMath::Nint(dyCorr * fgScalePad / fgWidthPad[layer]); | |
69 | } | |
70 | ||
71 | void AliTRDltuParam::GetDyRange(Int_t det, Int_t rob, Int_t mcm, Int_t ch, | |
72 | Int_t &dyMinInt, Int_t &dyMaxInt) const | |
73 | { | |
74 | // calculate the deflection range in which tracklets are accepted | |
75 | ||
76 | dyMinInt = fgDyMin; | |
77 | dyMaxInt = fgDyMax; | |
78 | ||
39e4e4cf | 79 | if (TMath::Abs(fMagField) < 0.1) |
5e86ff99 | 80 | return; |
81 | ||
82 | Float_t e = 0.30; | |
83 | ||
84 | Float_t maxDeflTemp = GetPerp(det, rob, mcm, ch)/2. * // Sekante/2 | |
85 | (e * TMath::Abs(fMagField) / fPtMin); // 1/R | |
86 | ||
87 | Float_t maxDeflAngle = 0.; | |
88 | ||
89 | if (maxDeflTemp < 1.) { | |
90 | maxDeflAngle = TMath::ASin(maxDeflTemp); | |
91 | ||
92 | Float_t dyMin = ( fgDriftLength * | |
93 | tan(GetPhi(det, rob, mcm, ch) - maxDeflAngle) ); | |
94 | ||
95 | dyMinInt = Int_t(dyMin / fgBinDy); | |
96 | if (dyMinInt < fgDyMin) | |
97 | dyMinInt = fgDyMin; | |
98 | ||
99 | Float_t dyMax = ( fgDriftLength * | |
100 | TMath::Tan(GetPhi(det, rob, mcm, ch) + maxDeflAngle) ); | |
101 | ||
102 | dyMaxInt = Int_t(dyMax / fgBinDy); | |
103 | if (dyMaxInt > fgDyMax) | |
104 | dyMaxInt = fgDyMax; | |
105 | } | |
106 | if ((dyMaxInt - dyMinInt) <= 0) { | |
107 | printf("strange dy range: [%i,%i]\n", dyMinInt, dyMaxInt); | |
108 | } | |
109 | } | |
110 | ||
111 | Float_t AliTRDltuParam::GetElongation(Int_t det, Int_t rob, Int_t mcm, Int_t ch) const | |
112 | { | |
113 | Int_t layer = det % 6; | |
114 | ||
115 | Float_t elongation = TMath::Abs(GetDist(det, rob, mcm, ch) / fgX[layer]); | |
116 | ||
117 | // sanity check | |
118 | if(elongation<0.001) { | |
119 | elongation=1.; | |
120 | } | |
121 | return elongation; | |
122 | } | |
123 | ||
124 | void AliTRDltuParam::GetCorrectionFactors(Int_t det, Int_t rob, Int_t mcm, Int_t ch, | |
125 | UInt_t &cor0, UInt_t &cor1) const | |
126 | { | |
127 | if (fPidTracklengthCorr == kTRUE ) { | |
128 | cor0 = Int_t ((1.0*fScaleQ0* (1./GetElongation(det, rob, mcm, ch)) )); | |
129 | cor1 = Int_t ((1.0*fScaleQ1* (1./GetElongation(det, rob, mcm, ch)) )); | |
130 | } | |
131 | else { | |
132 | cor0 = fScaleQ0; | |
133 | cor1 = fScaleQ1; | |
134 | } | |
135 | } | |
136 | ||
137 | Int_t AliTRDltuParam::GetNtimebins() const | |
138 | { | |
139 | return fNtimebins; | |
140 | } | |
141 | ||
142 | Float_t AliTRDltuParam::GetX(Int_t det, Int_t /* rob */, Int_t /* mcm */) const | |
143 | { | |
144 | Int_t layer = det%6; | |
145 | return fgX[layer]; | |
146 | } | |
147 | ||
148 | Float_t AliTRDltuParam::GetLocalY(Int_t det, Int_t rob, Int_t mcm, Int_t ch) const | |
149 | { | |
150 | Int_t layer = det%6; | |
151 | // calculate the pad position as in the TRAP | |
39e4e4cf | 152 | Float_t ypos = (-4 + 1 + (rob&0x1) * 4 + (mcm&0x3)) * 18 - ch - 0.5; // y position in bins of pad widths |
5e86ff99 | 153 | return ypos*fgWidthPad[layer]; |
154 | } | |
155 | ||
156 | Float_t AliTRDltuParam::GetLocalZ(Int_t det, Int_t rob, Int_t mcm) const | |
157 | { | |
158 | Int_t stack = (det%30) / 6; | |
159 | Int_t layer = det % 6; | |
160 | Int_t row = (rob/2) * 4 + mcm/4; | |
161 | ||
162 | if (stack == 2) { | |
163 | if (row == 0) | |
164 | return (fgZrow[layer][stack] - 0.5 * fgLengthOuterPadC0); | |
165 | else if (row == 11) | |
166 | return (fgZrow[layer][stack] - 1.5 * fgLengthOuterPadC0 - (row - 1) * fgLengthInnerPadC0); | |
167 | else | |
168 | return (fgZrow[layer][stack] - fgLengthOuterPadC0 - (row - 0.5) * fgLengthInnerPadC0); | |
169 | } | |
170 | else { | |
171 | if (row == 0) | |
172 | return (fgZrow[layer][stack] - 0.5 * fgLengthOuterPadC1[layer]); | |
173 | else if (row == 15) | |
174 | return (fgZrow[layer][stack] - 1.5 * fgLengthOuterPadC1[layer] - (row - 1) * fgLengthInnerPadC1[layer]); | |
175 | else | |
176 | return (fgZrow[layer][stack] - fgLengthOuterPadC1[layer] - (row - 0.5) * fgLengthInnerPadC1[layer]); | |
177 | } | |
178 | } | |
179 | ||
180 | Float_t AliTRDltuParam::GetPerp(Int_t det, Int_t rob, Int_t mcm, Int_t ch) const | |
181 | { | |
182 | return TMath::Sqrt(GetLocalY(det, rob, mcm, ch)*GetLocalY(det, rob, mcm, ch) + | |
183 | GetX(det, rob, mcm)*GetX(det, rob, mcm) ); | |
184 | } | |
185 | ||
186 | Float_t AliTRDltuParam::GetPhi(Int_t det, Int_t rob, Int_t mcm, Int_t ch) const | |
187 | { | |
188 | return TMath::ATan2(GetLocalY(det, rob, mcm, ch), GetX(det, rob, mcm)); | |
189 | } | |
190 | ||
191 | Float_t AliTRDltuParam::GetDist(Int_t det, Int_t rob, Int_t mcm, Int_t ch) const | |
192 | { | |
193 | return TMath::Sqrt(GetLocalY(det, rob, mcm, ch)*GetLocalY(det, rob, mcm, ch) + | |
194 | GetX(det, rob, mcm)*GetX(det, rob, mcm) + | |
195 | GetLocalZ(det, rob, mcm)*GetLocalZ(det, rob, mcm) ); | |
196 | } |