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0ee00e25 | 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 | ||
e3b2b5e5 | 16 | /////////////////////////////////////////////////////// |
17 | // // | |
18 | // // | |
19 | // Tracklet object created in the local tracking // | |
20 | // // | |
21 | // // | |
22 | /////////////////////////////////////////////////////// | |
23 | ||
0ee00e25 | 24 | #include <TGraph.h> |
25 | #include <TMath.h> | |
26 | #include <TF1.h> | |
27 | ||
6d50f529 | 28 | #include "AliLog.h" |
29 | ||
0ee00e25 | 30 | #include "AliTRDcalibDB.h" |
31 | #include "AliTRDCommonParam.h" | |
32 | #include "AliTRDpadPlane.h" | |
33 | #include "AliTRDgeometry.h" | |
0ee00e25 | 34 | #include "AliTRDmcmTracklet.h" |
35 | ||
36 | ClassImp(AliTRDmcmTracklet) | |
37 | ||
38 | //_____________________________________________________________________________ | |
39 | AliTRDmcmTracklet::AliTRDmcmTracklet() | |
6d50f529 | 40 | :TObject() |
41 | ,fDetector(-1) | |
42 | ,fRow(-1) | |
43 | ,fTrackLabel(-1) | |
44 | ,fNclusters(0) | |
45 | ,fN(0) | |
46 | ,fGPos(0) | |
47 | ,fGAmp(0) | |
48 | ,fTime0(0) | |
49 | ,fRowz(0) | |
50 | ,fSlope(0) | |
51 | ,fOffset(0) | |
52 | ,fPt(0) | |
53 | ,fdQdl(0) | |
0ee00e25 | 54 | { |
0ee00e25 | 55 | // |
56 | // AliTRDmcmTracklet default constructor | |
57 | // | |
58 | ||
0ee00e25 | 59 | for (Int_t time = 0; time < kNtimeBins; time++) { |
60 | for (Int_t icl = 0; icl < kNclsPads; icl++) { | |
61 | fADC[time][icl] = 0; | |
62 | } | |
63 | for (Int_t it = 0; it < kNdict; it++) { | |
64 | fTrack[time][it] = -1; | |
65 | } | |
66 | fTime[time] = 0; | |
67 | fCol[time] = 0; | |
68 | } | |
69 | ||
0ee00e25 | 70 | } |
71 | ||
72 | //_____________________________________________________________________________ | |
73 | AliTRDmcmTracklet::AliTRDmcmTracklet(Int_t det, Int_t row, Int_t n) | |
6d50f529 | 74 | :TObject() |
75 | ,fDetector(det) | |
76 | ,fRow(row) | |
77 | ,fTrackLabel(-1) | |
78 | ,fNclusters(0) | |
79 | ,fN(n) | |
80 | ,fGPos(0) | |
81 | ,fGAmp(0) | |
82 | ,fTime0(0) | |
83 | ,fRowz(0) | |
84 | ,fSlope(0) | |
85 | ,fOffset(0) | |
86 | ,fPt(0) | |
87 | ,fdQdl(0) | |
0ee00e25 | 88 | { |
0ee00e25 | 89 | // |
90 | // AliTRDmcmTracklet default constructor | |
91 | // | |
92 | ||
0ee00e25 | 93 | for (Int_t time = 0; time < kNtimeBins; time++) { |
94 | for (Int_t icl = 0; icl < kNclsPads; icl++) { | |
95 | fADC[time][icl] = 0; | |
96 | } | |
97 | for (Int_t it = 0; it < kNdict; it++) { | |
98 | fTrack[time][it] = -1; | |
99 | } | |
100 | fTime[time] = 0; | |
101 | fCol[time] = 0; | |
102 | } | |
103 | ||
0ee00e25 | 104 | fGPos = new TGraph(0); |
105 | fGAmp = new TGraph(0); | |
106 | ||
6d50f529 | 107 | } |
108 | ||
109 | //_____________________________________________________________________________ | |
110 | AliTRDmcmTracklet::AliTRDmcmTracklet(const AliTRDmcmTracklet &t) | |
111 | :TObject(t) | |
112 | ,fDetector(t.fDetector) | |
113 | ,fRow(t.fRow) | |
114 | ,fTrackLabel(t.fTrackLabel) | |
115 | ,fNclusters(t.fNclusters) | |
116 | ,fN(t.fN) | |
117 | ,fGPos(NULL) | |
118 | ,fGAmp(NULL) | |
119 | ,fTime0(t.fTime0) | |
120 | ,fRowz(t.fRowz) | |
121 | ,fSlope(t.fSlope) | |
122 | ,fOffset(t.fOffset) | |
123 | ,fPt(t.fPt) | |
124 | ,fdQdl(t.fdQdl) | |
125 | { | |
126 | // | |
127 | // AliTRDmcmTracklet copy constructor | |
128 | // | |
129 | ||
130 | for (Int_t time = 0; time < kNtimeBins; time++) { | |
131 | for (Int_t icl = 0; icl < kNclsPads; icl++) { | |
132 | ((AliTRDmcmTracklet &) t).fADC[time][icl] = 0; | |
133 | } | |
134 | for (Int_t it = 0; it < kNdict; it++) { | |
135 | ((AliTRDmcmTracklet &) t).fTrack[time][it] = -1; | |
136 | } | |
137 | ((AliTRDmcmTracklet &) t).fTime[time] = 0; | |
138 | ((AliTRDmcmTracklet &) t).fCol[time] = 0; | |
139 | } | |
0ee00e25 | 140 | |
141 | } | |
142 | ||
143 | //_____________________________________________________________________________ | |
144 | AliTRDmcmTracklet::~AliTRDmcmTracklet() | |
145 | { | |
0ee00e25 | 146 | // |
147 | // AliTRDmcmTracklet destructor | |
148 | // | |
3fcb9908 | 149 | |
150 | if (fGPos != 0) delete fGPos; | |
151 | if (fGAmp != 0) delete fGAmp; | |
152 | ||
e3b2b5e5 | 153 | } |
154 | ||
155 | //_____________________________________________________________________________ | |
156 | AliTRDmcmTracklet &AliTRDmcmTracklet::operator=(const AliTRDmcmTracklet &t) | |
157 | { | |
158 | // | |
6d50f529 | 159 | // Assignment operator |
e3b2b5e5 | 160 | // |
161 | ||
162 | if (this != &t) ((AliTRDmcmTracklet &) t).Copy(*this); | |
163 | return *this; | |
164 | ||
165 | } | |
166 | ||
167 | //_____________________________________________________________________________ | |
168 | void AliTRDmcmTracklet::Copy(TObject &t) const | |
169 | { | |
170 | // | |
6d50f529 | 171 | // Copy function |
e3b2b5e5 | 172 | // |
173 | ||
174 | ((AliTRDmcmTracklet &) t).fDetector = fDetector; | |
175 | ((AliTRDmcmTracklet &) t).fRow = fRow; | |
176 | ((AliTRDmcmTracklet &) t).fTrackLabel = fTrackLabel; | |
177 | ((AliTRDmcmTracklet &) t).fNclusters = fNclusters; | |
178 | ((AliTRDmcmTracklet &) t).fN = fN; | |
179 | ((AliTRDmcmTracklet &) t).fGPos = NULL; | |
180 | ((AliTRDmcmTracklet &) t).fGAmp = NULL; | |
181 | ((AliTRDmcmTracklet &) t).fTime0 = fTime0; | |
182 | ((AliTRDmcmTracklet &) t).fRowz = fRowz; | |
183 | ((AliTRDmcmTracklet &) t).fSlope = fSlope; | |
184 | ((AliTRDmcmTracklet &) t).fOffset = fOffset; | |
185 | ((AliTRDmcmTracklet &) t).fPt = fPt; | |
186 | ((AliTRDmcmTracklet &) t).fdQdl = fdQdl; | |
187 | ||
188 | for (Int_t time = 0; time < kNtimeBins; time++) { | |
189 | for (Int_t icl = 0; icl < kNclsPads; icl++) { | |
190 | ((AliTRDmcmTracklet &) t).fADC[time][icl] = 0; | |
191 | } | |
192 | for (Int_t it = 0; it < kNdict; it++) { | |
193 | ((AliTRDmcmTracklet &) t).fTrack[time][it] = -1; | |
194 | } | |
195 | ((AliTRDmcmTracklet &) t).fTime[time] = 0; | |
196 | ((AliTRDmcmTracklet &) t).fCol[time] = 0; | |
197 | } | |
198 | ||
199 | } | |
200 | ||
201 | //_____________________________________________________________________________ | |
3fcb9908 | 202 | void AliTRDmcmTracklet::Reset() |
e3b2b5e5 | 203 | { |
204 | // | |
3fcb9908 | 205 | // Reset the tracklet information |
206 | // | |
207 | ||
208 | fDetector = -1; | |
209 | fRow = -1; | |
210 | ||
211 | for (Int_t time = 0; time < kNtimeBins; time++) { | |
212 | for (Int_t icl = 0; icl < kNclsPads; icl++) { | |
213 | fADC[time][icl] = 0; | |
214 | } | |
215 | for (Int_t it = 0; it < kNdict; it++) { | |
216 | fTrack[time][it] = -1; | |
217 | } | |
218 | fTime[time] = 0; | |
219 | fCol[time] = 0; | |
220 | } | |
221 | ||
222 | fNclusters = 0; | |
223 | fN = 0; | |
224 | fTrackLabel = -1; | |
225 | ||
226 | fGPos->Set(0); | |
227 | fGAmp->Set(0); | |
228 | ||
229 | fSlope = 0.0; | |
230 | fOffset = 0.0; | |
231 | fTime0 = 0.0; | |
232 | fRowz = 0.0; | |
233 | fPt = 0.0; | |
234 | fdQdl = 0.0; | |
235 | ||
236 | } | |
237 | ||
238 | //_____________________________________________________________________________ | |
239 | void AliTRDmcmTracklet::AddCluster(Int_t icol, Int_t itb, Float_t *adc, Int_t *track) | |
240 | { | |
e3b2b5e5 | 241 | // |
3fcb9908 | 242 | // Add a cluster to the tracklet |
e3b2b5e5 | 243 | // |
244 | ||
245 | if (fNclusters >= kNtimeBins) return; | |
246 | ||
247 | for (Int_t icl = 0; icl < kNclsPads; icl++) { | |
e3b2b5e5 | 248 | fADC[fNclusters][icl] = adc[icl]; |
249 | } | |
250 | ||
251 | fTrack[fNclusters][0] = track[0]; | |
252 | fTrack[fNclusters][1] = track[1]; | |
253 | fTrack[fNclusters][2] = track[2]; | |
254 | fTime[fNclusters] = itb; | |
255 | fCol[fNclusters] = icol; | |
256 | ||
257 | fNclusters++; | |
0ee00e25 | 258 | |
259 | } | |
260 | ||
261 | //_____________________________________________________________________________ | |
262 | void AliTRDmcmTracklet::MakeTrackletGraph(AliTRDgeometry *geo, Float_t field) | |
263 | { | |
0ee00e25 | 264 | // |
265 | // Tracklet graph of positions (global coordinates, rotated [cm]) | |
266 | // | |
267 | ||
268 | if (!geo) { | |
6d50f529 | 269 | AliError("No geometry."); |
0ee00e25 | 270 | return; |
271 | } | |
272 | ||
273 | AliTRDCommonParam* commonParam = AliTRDCommonParam::Instance(); | |
6d50f529 | 274 | if (!commonParam) { |
275 | AliError("No common parameters."); | |
0ee00e25 | 276 | return; |
277 | } | |
278 | ||
279 | AliTRDcalibDB* calibration = AliTRDcalibDB::Instance(); | |
6d50f529 | 280 | if (!calibration) { |
281 | AliError("No instance of AliTRDcalibDB."); | |
0ee00e25 | 282 | return; |
283 | } | |
284 | ||
285 | Int_t iplan, icham; | |
286 | ||
287 | iplan = geo->GetPlane(fDetector); | |
288 | icham = geo->GetChamber(fDetector); | |
289 | ||
290 | AliTRDpadPlane *padPlane = commonParam->GetPadPlane(iplan,icham); | |
291 | ||
b43a3e17 | 292 | Float_t samplFreq = commonParam->GetSamplingFrequency(); |
0ee00e25 | 293 | |
294 | Int_t time, col; | |
295 | Float_t amp[3]; | |
e3b2b5e5 | 296 | Float_t xpos, ypos, xzero, colSize, timeBinSize; |
297 | Float_t vDrift, omegaTau, lorentzAngle, thetaSlope; | |
298 | Float_t tiltingAngle; | |
0ee00e25 | 299 | Int_t npg = 0; |
300 | ||
301 | for (Int_t icl = 0; icl < fNclusters; icl++) { | |
302 | ||
303 | time = GetClusterTime(icl); | |
304 | ||
305 | amp[0] = GetClusterADC(icl)[0]; | |
306 | amp[1] = GetClusterADC(icl)[1]; | |
307 | amp[2] = GetClusterADC(icl)[2]; | |
308 | ||
309 | col = GetClusterCol(icl); | |
310 | ||
311 | if (amp[0] < 0.0 || amp[1] < 0.0 || amp[2] < 0.0) continue; | |
312 | ||
e3b2b5e5 | 313 | ypos = GetClusY(amp,iplan); |
0ee00e25 | 314 | |
e3b2b5e5 | 315 | colSize = padPlane->GetColSize(col); |
0ee00e25 | 316 | vDrift = calibration->GetVdrift(fDetector,col,fRow); |
e3b2b5e5 | 317 | timeBinSize = vDrift/samplFreq; |
0ee00e25 | 318 | |
319 | // From v4-03-Release to HEAD28Mar06 the sign has changed from "-" to "+" | |
320 | // due to a change in the digitizer | |
6d50f529 | 321 | omegaTau = TMath::Sign(1.0,(Double_t)field)*GetOmegaTau(vDrift,TMath::Abs(field)); |
e3b2b5e5 | 322 | lorentzAngle = TMath::ATan(omegaTau)*180.0/TMath::Pi(); |
0ee00e25 | 323 | |
e3b2b5e5 | 324 | xpos = (time+0.5) * timeBinSize; |
325 | xpos = geo->GetTime0(iplan) - xpos; | |
0ee00e25 | 326 | |
e3b2b5e5 | 327 | ypos = padPlane->GetColPos(col) - (ypos + 0.5) * colSize; |
0ee00e25 | 328 | |
329 | // ExB correction | |
e3b2b5e5 | 330 | xzero = geo->GetTime0(iplan); |
331 | ypos = ypos + (xpos-xzero) * omegaTau; | |
0ee00e25 | 332 | |
333 | // tilted pads correction | |
e3b2b5e5 | 334 | thetaSlope = - padPlane->GetRowPos(fRow)/geo->GetTime0(iplan); |
335 | tiltingAngle = padPlane->GetTiltingAngle()/180.0*TMath::Pi(); | |
336 | ypos = ypos - (xpos-xzero) * thetaSlope * TMath::Sin(tiltingAngle); | |
0ee00e25 | 337 | |
e3b2b5e5 | 338 | fGPos->SetPoint(npg,(Double_t)xpos,(Double_t)ypos); |
0ee00e25 | 339 | npg++; |
340 | ||
341 | } | |
342 | ||
343 | fGPos->Set(npg); | |
344 | ||
345 | fTime0 = geo->GetTime0(iplan) - AliTRDgeometry::CdrHght() - 0.5*AliTRDgeometry::CamHght(); | |
9e79a757 | 346 | fRowz = padPlane->GetRowPos(fRow) - padPlane->GetRowSize(fRow)/2.0; |
0ee00e25 | 347 | |
6d50f529 | 348 | Double_t xMin = 0; |
349 | Double_t xMax = 0; | |
350 | Double_t x, y; | |
351 | fGPos->GetPoint(0 ,x,y); | |
352 | xMax = x + 0.1; | |
353 | fGPos->GetPoint(npg-1,x,y); | |
354 | xMin = x - 0.1; | |
0ee00e25 | 355 | |
356 | TF1 *line = new TF1("line","[0]+x*[1]",xMin,xMax); | |
357 | fGPos->Fit(line,"WRQ0"); | |
358 | ||
359 | fOffset = line->Eval(fTime0); | |
360 | fSlope = TMath::ATan(line->GetParameter(1))*180.0/TMath::Pi(); | |
361 | ||
362 | line->Delete(); | |
363 | ||
e3b2b5e5 | 364 | Float_t fx = fTime0; |
365 | Float_t fy = fOffset; | |
0ee00e25 | 366 | |
e3b2b5e5 | 367 | Float_t infSlope = TMath::ATan(fy/fx)/TMath::Pi()*180.0; |
6d50f529 | 368 | Float_t alpha = fSlope - infSlope; |
369 | Float_t r = TMath::Sqrt(fx*fx + fy*fy)/(2.0*TMath::Sin(alpha/180.0*TMath::Pi())); | |
0ee00e25 | 370 | |
e3b2b5e5 | 371 | fPt = 0.3 * field * 0.01 * r; |
0ee00e25 | 372 | |
373 | return; | |
374 | ||
375 | } | |
376 | ||
377 | //_____________________________________________________________________________ | |
378 | void AliTRDmcmTracklet::MakeClusAmpGraph() | |
379 | { | |
380 | // | |
381 | // Tracklet graph of cluster charges | |
382 | // | |
383 | ||
6d50f529 | 384 | Int_t time; |
0ee00e25 | 385 | Float_t amp[3]; |
6d50f529 | 386 | Int_t npg = 0; |
387 | ||
0ee00e25 | 388 | fdQdl = 0.0; |
389 | for (Int_t icl = 0; icl < fNclusters; icl++) { | |
390 | ||
391 | time = GetClusterTime(icl); | |
392 | ||
393 | amp[0] = GetClusterADC(icl)[0]; | |
394 | amp[1] = GetClusterADC(icl)[1]; | |
395 | amp[2] = GetClusterADC(icl)[2]; | |
396 | ||
397 | fGAmp->SetPoint(npg,(Double_t)(time+0.5),(Double_t)(amp[0]+amp[1]+amp[2])); | |
398 | npg++; | |
399 | ||
400 | fdQdl += amp[0]+amp[1]+amp[2]; | |
401 | ||
402 | } | |
403 | ||
404 | fGAmp->Set(npg); | |
405 | ||
406 | fdQdl /= (Float_t)npg; | |
407 | ||
408 | return; | |
409 | ||
410 | } | |
411 | ||
412 | //_____________________________________________________________________________ | |
e3b2b5e5 | 413 | Float_t AliTRDmcmTracklet::GetClusY(Float_t *adc, Int_t pla) const |
0ee00e25 | 414 | { |
415 | // | |
416 | // Cluster position in the phi direction in pad units (relative to the pad border) | |
417 | // | |
418 | ||
e3b2b5e5 | 419 | Float_t ypos = 0.0; |
0ee00e25 | 420 | |
e3b2b5e5 | 421 | Float_t a0 = adc[0]; |
422 | Float_t a1 = adc[1]; | |
423 | Float_t a2 = adc[2]; | |
0ee00e25 | 424 | |
e3b2b5e5 | 425 | Float_t t1, t2, w1 ,w2; |
0ee00e25 | 426 | |
e3b2b5e5 | 427 | Float_t w = 1.0; // pad units |
0ee00e25 | 428 | |
e3b2b5e5 | 429 | Float_t sigma = 0.0; |
0ee00e25 | 430 | |
431 | switch(pla) { | |
432 | case 0: | |
e3b2b5e5 | 433 | sigma = 0.515; break; |
0ee00e25 | 434 | case 1: |
e3b2b5e5 | 435 | sigma = 0.501; break; |
0ee00e25 | 436 | case 2: |
e3b2b5e5 | 437 | sigma = 0.491; break; |
0ee00e25 | 438 | case 3: |
e3b2b5e5 | 439 | sigma = 0.481; break; |
0ee00e25 | 440 | case 4: |
e3b2b5e5 | 441 | sigma = 0.471; break; |
0ee00e25 | 442 | case 5: |
e3b2b5e5 | 443 | sigma = 0.463; break; |
0ee00e25 | 444 | default: |
6d50f529 | 445 | AliError("Wrong plane number."); |
0ee00e25 | 446 | return 0.0; |
447 | } | |
448 | ||
e3b2b5e5 | 449 | sigma *= w; |
0ee00e25 | 450 | |
e3b2b5e5 | 451 | t1 = 0.0; |
452 | w1 = 0.0; | |
453 | if( a0 > 0 ) { | |
454 | w1 = a0*a0; | |
455 | //w1 = a0; | |
456 | t1 = w1*((sigma*sigma)/w*TMath::Log(a1/a0)-0.5*w); | |
0ee00e25 | 457 | } |
e3b2b5e5 | 458 | t2 = 0.0; |
459 | w2 = 0.0; | |
460 | if( a2 > 0 ) { | |
461 | w2 = a2*a2; | |
462 | //w2 = a2; | |
463 | t2 = w2*((sigma*sigma)/w*TMath::Log(a2/a1)+0.5*w); | |
0ee00e25 | 464 | } |
465 | ||
e3b2b5e5 | 466 | ypos = w*(t1+t2)/(w1+w2); // range: -0.5*w ... +0.5*w |
0ee00e25 | 467 | |
e3b2b5e5 | 468 | return ypos; |
0ee00e25 | 469 | |
470 | } | |
471 | ||
472 | //_____________________________________________________________________________ | |
473 | void AliTRDmcmTracklet::CookLabel(Float_t frac) | |
474 | { | |
475 | // | |
476 | // Cook the track label from cluster labels | |
477 | // | |
478 | ||
479 | const Int_t kMaxTracks = 10; | |
480 | Int_t trackLabel[kMaxTracks]; | |
481 | Int_t trackCount[kMaxTracks]; | |
482 | for (Int_t it = 0; it < kMaxTracks; it++) { | |
483 | trackLabel[it] = -1; | |
484 | trackCount[it] = 0; | |
485 | } | |
486 | ||
487 | Bool_t counted; | |
488 | Int_t label, nTracks = 0; | |
489 | for (Int_t icl = 0; icl < fNclusters; icl++) { | |
490 | ||
491 | for (Int_t id = 0; id < kNdict; id++) { | |
492 | ||
493 | if (fTrack[icl][id] == -1) continue; | |
494 | ||
495 | label = fTrack[icl][id]; | |
496 | ||
497 | counted = kFALSE; | |
498 | for (Int_t it = 0; it < nTracks; it++) { | |
499 | if (label == trackLabel[it]) { | |
500 | trackCount[it]++; | |
501 | counted = kTRUE; | |
502 | break; | |
503 | } | |
504 | } | |
505 | if (!counted) { | |
506 | trackLabel[nTracks] = label; | |
507 | trackCount[nTracks]++; | |
508 | nTracks++; | |
509 | if (nTracks == kMaxTracks) { | |
6d50f529 | 510 | AliWarning("Too many tracks for this tracklet."); |
0ee00e25 | 511 | nTracks--; |
512 | break; | |
513 | } | |
514 | } | |
515 | ||
516 | } | |
517 | ||
518 | } | |
519 | ||
520 | for (Int_t it = 0; it < kMaxTracks; it++) { | |
521 | if (trackCount[it] >= (Int_t)(frac*fNclusters)) { | |
522 | fTrackLabel = trackLabel[it]; | |
523 | break; | |
524 | } | |
525 | } | |
526 | ||
527 | } | |
528 | ||
529 | //_____________________________________________________________________________ | |
e3b2b5e5 | 530 | Float_t AliTRDmcmTracklet::GetOmegaTau(Float_t vdrift, Float_t field) const |
0ee00e25 | 531 | { |
532 | // | |
533 | // Returns omega*tau (tan(Lorentz-angle)) for a given drift velocity <vd> | |
534 | // and a B-field <b> for Xe/CO2 (15%). | |
535 | // The values are according to a GARFIELD simulation. | |
536 | // | |
537 | ||
538 | // | |
539 | // Copy of the "AliTRDcalibDB" function, taking as argument the magnetic field too | |
540 | // | |
541 | ||
542 | const Int_t kNb = 5; | |
543 | Float_t p0[kNb] = { 0.004810, 0.007412, 0.010252, 0.013409, 0.016888 }; | |
544 | Float_t p1[kNb] = { 0.054875, 0.081534, 0.107333, 0.131983, 0.155455 }; | |
545 | Float_t p2[kNb] = { -0.008682, -0.012896, -0.016987, -0.020880, -0.024623 }; | |
546 | Float_t p3[kNb] = { 0.000155, 0.000238, 0.000330, 0.000428, 0.000541 }; | |
547 | ||
548 | Int_t ib = ((Int_t) (10 * (field - 0.15))); | |
549 | ib = TMath::Max( 0,ib); | |
550 | ib = TMath::Min(kNb,ib); | |
551 | ||
552 | Float_t alphaL = p0[ib] | |
6d50f529 | 553 | + p1[ib] * vdrift |
554 | + p2[ib] * vdrift*vdrift | |
555 | + p3[ib] * vdrift*vdrift*vdrift; | |
0ee00e25 | 556 | |
557 | return TMath::Tan(alphaL); | |
558 | ||
559 | } |