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4c039060 | 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 | ||
803d1ab0 | 16 | /* $Id$ */ |
4c039060 | 17 | |
d12ebe74 | 18 | // Read beam halo background particles from a boundary source |
19 | // Boundary source is in the LHCb format http://www.hep.manchester.ac.uk/u/robert/LHC_backgrounds/Note-MIBStudies.pdf | |
20 | // and has been provided by Robert Appleby | |
675e9664 | 21 | // Author: andreas.morsch@cern.ch |
22 | ||
d12ebe74 | 23 | |
116cbefd | 24 | #include <stdlib.h> |
c5970876 | 25 | |
1578254f | 26 | #include <TDatabasePDG.h> |
d12ebe74 | 27 | #include <TCanvas.h> |
28 | #include <TGraph.h> | |
116cbefd | 29 | #include <TPDGCode.h> |
d12ebe74 | 30 | #include <TSystem.h> |
116cbefd | 31 | |
32 | #include "AliGenHalo.h" | |
33 | #include "AliRun.h" | |
418e091f | 34 | #include "AliLog.h" |
f87cfe57 | 35 | |
198bb1c7 | 36 | ClassImp(AliGenHalo) |
37 | ||
38 | AliGenHalo::AliGenHalo() | |
d12ebe74 | 39 | :AliGenerator(-1), |
40 | fFile(0), | |
41 | fFileName(0), | |
42 | fSide(1), | |
43 | fRunPeriod(kY3D90), | |
44 | fTimePerEvent(1.e-4), | |
45 | fNskip(0), | |
46 | fZ1(0), | |
47 | fZ2(0), | |
48 | fG1(0), | |
49 | fG2(0), | |
50 | fGPASize(0), | |
51 | fLossID(0), | |
52 | fLossA(0), | |
53 | fPdg(0), | |
54 | fLossT0(0), | |
55 | fLossZ(0), | |
56 | fLossW(0), | |
57 | fXS(0), | |
58 | fYS(0), | |
59 | fZS(0), | |
60 | fDX(0), | |
61 | fDY(0), | |
62 | fEkin(0), | |
63 | fTS(0), | |
64 | fWS(0) | |
fe4da5cc | 65 | { |
f87cfe57 | 66 | // Constructor |
d12ebe74 | 67 | |
68 | fName = "Halo"; | |
69 | fTitle = "Halo from LHC Beam"; | |
fe4da5cc | 70 | // |
71 | // Read all particles | |
d12ebe74 | 72 | fNpart = -1; |
73 | SetAnalog(0); | |
fe4da5cc | 74 | } |
75 | ||
76 | AliGenHalo::AliGenHalo(Int_t npart) | |
1c56e311 | 77 | :AliGenerator(npart), |
d12ebe74 | 78 | fFile(0), |
79 | fFileName(0), | |
80 | fSide(1), | |
81 | fRunPeriod(kY3D90), | |
82 | fTimePerEvent(1.e-4), | |
83 | fNskip(0), | |
84 | fZ1(0), | |
85 | fZ2(0), | |
86 | fG1(0), | |
87 | fG2(0), | |
88 | fGPASize(0), | |
89 | fLossID(0), | |
90 | fLossA(0), | |
91 | fPdg(0), | |
92 | fLossT0(0), | |
93 | fLossZ(0), | |
94 | fLossW(0), | |
95 | fXS(0), | |
96 | fYS(0), | |
97 | fZS(0), | |
98 | fDX(0), | |
99 | fDY(0), | |
100 | fEkin(0), | |
101 | fTS(0), | |
102 | fWS(0) | |
fe4da5cc | 103 | { |
f87cfe57 | 104 | // Constructor |
d12ebe74 | 105 | fName = "Halo"; |
106 | fTitle= "Halo from LHC Beam"; | |
fe4da5cc | 107 | // |
d12ebe74 | 108 | fNpart = npart; |
109 | // | |
110 | SetAnalog(0); | |
fe4da5cc | 111 | } |
112 | ||
113 | //____________________________________________________________ | |
114 | AliGenHalo::~AliGenHalo() | |
115 | { | |
f87cfe57 | 116 | // Destructor |
fe4da5cc | 117 | } |
118 | ||
119 | //____________________________________________________________ | |
120 | void AliGenHalo::Init() | |
f87cfe57 | 121 | { |
122 | // Initialisation | |
d12ebe74 | 123 | fFile = fopen(fFileName,"r"); |
124 | if (fFile) { | |
125 | printf("\n File %s opened for reading, %p ! \n ", fFileName.Data(), (void*)fFile); | |
126 | } else { | |
127 | printf("\n Opening of file %s failed, %p ! \n ", fFileName.Data(), (void*)fFile); | |
418e091f | 128 | return; |
d12ebe74 | 129 | } |
c321951c | 130 | |
131 | if (fNskip > 0) { | |
132 | // Skip the first fNskip events | |
133 | SkipEvents(); | |
134 | } | |
d12ebe74 | 135 | // |
136 | // | |
137 | // | |
138 | // Read file with gas pressure values | |
139 | char *name = 0; | |
140 | if (fRunPeriod < 5) { | |
141 | name = gSystem->ExpandPathName("$(ALICE_ROOT)/LHC/gasPressure.dat" ); | |
142 | fGPASize = 21; | |
143 | fG1 = new Float_t[fGPASize]; | |
144 | fG2 = new Float_t[fGPASize]; | |
145 | fZ1 = new Float_t[fGPASize]; | |
146 | fZ2 = new Float_t[fGPASize]; | |
147 | } else if (fRunPeriod == 5) { | |
148 | name = gSystem->ExpandPathName("$(ALICE_ROOT)/LHC/pressure_2003_startup.dat"); | |
149 | fGPASize = 18853; | |
150 | fG1 = new Float_t[fGPASize]; | |
151 | fZ1 = new Float_t[fGPASize]; | |
152 | } else if (fRunPeriod ==6) { | |
153 | name = gSystem->ExpandPathName("$(ALICE_ROOT)/LHC/pressure_2003_conditioned.dat"); | |
154 | fGPASize = 12719; | |
155 | fG1 = new Float_t[fGPASize]; | |
156 | fZ1 = new Float_t[fGPASize]; | |
157 | } else { | |
158 | Fatal("Init()", "No gas pressure file for given run period !"); | |
159 | } | |
160 | ||
418e091f | 161 | |
162 | FILE* file = 0; | |
163 | if (name) file = fopen(name, "r"); | |
164 | if (!file) { | |
165 | AliError("No gas pressure file"); | |
166 | return; | |
167 | } | |
168 | ||
d12ebe74 | 169 | Float_t z; |
170 | Int_t i; | |
171 | Float_t p[5]; | |
172 | ||
173 | const Float_t kCrossSection = 0.094e-28; // m^2 | |
174 | const Float_t kFlux = 1.e11 / 25.e-9; // protons/s | |
175 | Float_t pFlux[5] = {0.2, 0.2, 0.3, 0.3, 1.0}; | |
176 | ||
177 | if (fRunPeriod < 5) { | |
178 | // | |
179 | // Ring 1 | |
180 | // | |
181 | ||
182 | for (i = 0; i < fGPASize; i++) | |
183 | { | |
184 | fscanf(file, "%f %f %f %f %f %f", &z, &p[0], &p[1], &p[2] , &p[3], &p[4]); | |
185 | fG1[i] = p[fRunPeriod]; | |
186 | ||
187 | if (i > 0) { | |
188 | fZ1[i] = fZ1[i-1] + z; | |
189 | } else { | |
190 | fZ1[i] = 20.; | |
191 | } | |
192 | } | |
193 | // | |
194 | // Ring 2 | |
195 | // | |
196 | for (i = 0; i < fGPASize; i++) | |
197 | { | |
198 | fscanf(file, "%f %f %f %f %f %f", &z, &p[0], &p[1], &p[2] , &p[3], &p[4]); | |
199 | fG2[i] = p[fRunPeriod]; | |
200 | if (i > 0) { | |
201 | fZ2[i] = fZ2[i-1] + z; | |
202 | } else { | |
203 | fZ2[i] = 20.; | |
204 | } | |
205 | } | |
206 | // | |
207 | // Interaction rates | |
208 | // | |
209 | for (i = 0; i < fGPASize; i++) | |
210 | { | |
211 | fG1[i] = fG1[i] * kCrossSection * pFlux[fRunPeriod] * kFlux; // 1/m/s | |
212 | fG2[i] = fG2[i] * kCrossSection * pFlux[fRunPeriod] * kFlux; // 1/m/s | |
213 | } | |
214 | ||
215 | } else { | |
216 | for (i = 0; i < fGPASize; i++) | |
217 | { | |
218 | fscanf(file, "%f %e %e %e %e %e", &z, &p[0], &p[1], &p[2], &p[3], &p[4]); | |
219 | z /= 1000.; | |
220 | fG1[i] = p[4] * kCrossSection * kFlux; // 1/m/s | |
221 | // 1/3 of nominal intensity at startup | |
222 | if (fRunPeriod == kLHCPR674Startup) fG1[i] /= 3.; | |
223 | fZ1[i] = z; | |
224 | } | |
225 | } | |
226 | ||
227 | ||
228 | ||
229 | ||
230 | // | |
231 | // Transform into interaction rates | |
232 | // | |
233 | ||
234 | ||
235 | ||
236 | ||
237 | Float_t sum1 = 0.; | |
238 | Float_t sum2 = 0.; | |
239 | ||
240 | for (Int_t iz = 0; iz < 300; iz++) { | |
241 | Float_t zpos = 20. + iz * 1.; | |
242 | zpos *= 100; | |
243 | Float_t wgt1 = GasPressureWeight( zpos); | |
244 | Float_t wgt2 = GasPressureWeight(-zpos); | |
245 | sum1 += wgt1; | |
246 | sum2 += wgt2; | |
247 | } | |
248 | sum1/=250.; | |
249 | sum2/=250.; | |
250 | printf("\n %f %f \n \n", sum1, sum2); | |
de4ab12f | 251 | delete file; |
f87cfe57 | 252 | } |
fe4da5cc | 253 | |
254 | //____________________________________________________________ | |
255 | void AliGenHalo::Generate() | |
256 | { | |
d12ebe74 | 257 | // Generate by reading particles from input file |
fe4da5cc | 258 | |
d12ebe74 | 259 | Float_t polar[3]= {0., 0., 0.}; |
fe4da5cc | 260 | Float_t origin[3]; |
261 | Float_t p[3], p0; | |
d12ebe74 | 262 | Float_t tz, txy; |
263 | Float_t mass; | |
fe4da5cc | 264 | // |
d12ebe74 | 265 | Int_t nt; |
266 | static Bool_t first = kTRUE; | |
267 | static Int_t oldID = -1; | |
268 | // | |
c321951c | 269 | |
270 | if (first && (fNskip == 0)) ReadNextParticle(); | |
271 | first = kFALSE; | |
272 | oldID = fLossID; | |
fe4da5cc | 273 | |
274 | while(1) { | |
d12ebe74 | 275 | // Push particle to stack |
276 | mass = TDatabasePDG::Instance()->GetParticle(fPdg)->Mass(); | |
c321951c | 277 | p0 = TMath::Sqrt(fEkin * fEkin + 2. * mass * fEkin); |
d12ebe74 | 278 | txy = TMath::Sqrt(fDX * fDX + fDY * fDY); |
73d273a4 | 279 | if (txy > 1.) { |
280 | tz = 0.; | |
fe4da5cc | 281 | } else { |
d12ebe74 | 282 | tz = - TMath::Sqrt(1. - txy); |
fe4da5cc | 283 | } |
c321951c | 284 | |
d12ebe74 | 285 | p[0] = p0 * fDX; |
286 | p[1] = p0 * fDY; | |
287 | p[2] = p0 * tz; | |
fe4da5cc | 288 | |
d12ebe74 | 289 | origin[0] = fXS; |
290 | origin[1] = fYS; | |
291 | origin[2] = 1950.; | |
fe4da5cc | 292 | |
dc3747df | 293 | PushTrack(fTrackIt , -1, fPdg , p, origin, polar, fTS - 1950./2.9979e10, kPNoProcess, nt, fWS); |
c321951c | 294 | |
d12ebe74 | 295 | Int_t nc = ReadNextParticle(); |
296 | ||
297 | if (fLossID != oldID || nc == 0) { | |
298 | oldID = fLossID; | |
299 | break; | |
300 | } | |
301 | } | |
302 | SetHighWaterMark(nt); | |
303 | } | |
304 | ||
fe4da5cc | 305 | |
d12ebe74 | 306 | Float_t AliGenHalo::GasPressureWeight(Float_t zPrimary) |
307 | { | |
308 | // | |
309 | // Return z-dependent gasspressure weight = interaction rate [1/m/s]. | |
310 | // | |
311 | Float_t weight = 0.; | |
312 | zPrimary /= 100.; // m | |
313 | if (fRunPeriod < 5) { | |
314 | Float_t zAbs = TMath::Abs(zPrimary); | |
315 | if (zPrimary > 0.) | |
316 | { | |
317 | if (zAbs > fZ1[20]) { | |
318 | weight = 2.e4; | |
319 | } else { | |
320 | for (Int_t i = 1; i < 21; i++) { | |
321 | if (zAbs < fZ1[i]) { | |
322 | weight = fG1[i]; | |
323 | break; | |
324 | } | |
325 | } | |
326 | } | |
327 | } else { | |
328 | if (zAbs > fZ2[20]) { | |
329 | weight = 2.e4; | |
330 | } else { | |
331 | for (Int_t i = 1; i < 21; i++) { | |
332 | if (zAbs < fZ2[i]) { | |
333 | weight = fG2[i]; | |
334 | break; | |
335 | } | |
336 | } | |
337 | } | |
338 | } | |
339 | } else { | |
340 | Int_t index = TMath::BinarySearch(fGPASize, fZ1, zPrimary); | |
341 | weight = fG1[index]; | |
342 | } | |
343 | return weight; | |
344 | } | |
fe4da5cc | 345 | |
d12ebe74 | 346 | void AliGenHalo::Draw(Option_t *) |
347 | { | |
348 | // Draws the gas pressure distribution | |
349 | Float_t z[400]; | |
350 | Float_t p[400]; | |
351 | ||
352 | for (Int_t i = 0; i < 400; i++) | |
353 | { | |
354 | z[i] = -20000. + Float_t(i) * 100; | |
355 | p[i] = GasPressureWeight(z[i]); | |
356 | } | |
357 | ||
358 | TGraph* gr = new TGraph(400, z, p); | |
359 | TCanvas* c1 = new TCanvas("c1","Canvas 1",400,10,600,700); | |
360 | c1->cd(); | |
361 | gr->Draw("AL"); | |
362 | } | |
fe4da5cc | 363 | |
d12ebe74 | 364 | Int_t AliGenHalo::ReadNextParticle() |
365 | { | |
366 | // Read the next particle from the file | |
367 | Int_t ncols = fscanf(fFile,"%d %f %f %d %f %d %f %f %f %f %f %f %f %f", | |
368 | &fLossID, &fLossT0, &fLossZ, &fLossA, &fLossW, &fPdg, &fXS, &fYS, &fZS, &fDX, &fDY, &fEkin, &fTS, &fWS); | |
369 | fLossZ /= 10.; | |
370 | fXS /= 10.; | |
371 | fYS /= 10.; | |
372 | fZS /= 10.; | |
373 | fTS *= 1.e-9; | |
374 | return (ncols); | |
375 | } | |
c321951c | 376 | |
377 | void AliGenHalo::SkipEvents() | |
378 | { | |
379 | // | |
380 | // Skip the first fNskip events | |
381 | Int_t skip = fNskip; | |
382 | Int_t oldID = -1; | |
383 | ||
384 | while (skip >= 0) | |
385 | { | |
386 | ReadNextParticle(); | |
387 | if (oldID != fLossID) { | |
388 | oldID = fLossID; | |
389 | skip--; | |
390 | } | |
391 | } | |
392 | } | |
73d273a4 | 393 | void AliGenHalo::CountEvents() |
394 | { | |
395 | Int_t nev = 0; | |
396 | Int_t oldID = -1; | |
397 | Int_t nc = 1; | |
398 | while (nc != -1) | |
399 | { | |
400 | nc = ReadNextParticle(); | |
401 | if (oldID != fLossID) { | |
402 | oldID = fLossID; | |
403 | nev++; | |
404 | printf("Number of events %10d %10d \n", nev, oldID); | |
405 | } | |
406 | } | |
407 | ||
408 | ||
409 | rewind(fFile); | |
410 | } | |
411 | ||
412 |