]>
Commit | Line | Data |
---|---|---|
14ab5373 | 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 | /* $Id$ */ |
14ab5373 | 17 | |
18 | // Read background particles from a boundary source | |
19 | // Very specialized generator to simulate background from beam halo. | |
20 | // The input file is a text file specially prepared | |
21 | // for this purpose. | |
22 | // Author: andreas.morsch@cern.ch | |
23 | ||
116cbefd | 24 | #include <stdlib.h> |
14ab5373 | 25 | |
26 | #include <TDatabasePDG.h> | |
116cbefd | 27 | #include <TPDGCode.h> |
eac2c8a3 | 28 | #include <TSystem.h> |
116cbefd | 29 | |
30 | #include "AliGenHaloProtvino.h" | |
31 | #include "AliRun.h" | |
14ab5373 | 32 | |
198bb1c7 | 33 | ClassImp(AliGenHaloProtvino) |
34 | ||
35 | AliGenHaloProtvino::AliGenHaloProtvino() | |
36 | :AliGenerator(-1) | |
14ab5373 | 37 | { |
38 | // Constructor | |
154d524b | 39 | |
40 | fName = "HaloProtvino"; | |
41 | fTitle = "Halo from LHC Tunnel"; | |
14ab5373 | 42 | // |
43 | // Read all particles | |
154d524b | 44 | fNpart = -1; |
45 | fFile = 0; | |
46 | fSide = 1; | |
eac2c8a3 | 47 | // |
48 | SetRunPeriod(); | |
7f98ef21 | 49 | SetTimePerEvent(); |
50 | SetAnalog(0); | |
14ab5373 | 51 | } |
52 | ||
53 | AliGenHaloProtvino::AliGenHaloProtvino(Int_t npart) | |
54 | :AliGenerator(npart) | |
55 | { | |
56 | // Constructor | |
154d524b | 57 | fName = "Halo"; |
58 | fTitle= "Halo from LHC Tunnel"; | |
14ab5373 | 59 | // |
154d524b | 60 | fNpart = npart; |
61 | fFile = 0; | |
62 | fSide = 1; | |
eac2c8a3 | 63 | // |
64 | SetRunPeriod(); | |
7f98ef21 | 65 | SetTimePerEvent(); |
66 | SetAnalog(0); | |
14ab5373 | 67 | } |
68 | ||
198bb1c7 | 69 | AliGenHaloProtvino::AliGenHaloProtvino(const AliGenHaloProtvino & HaloProtvino): |
70 | AliGenerator(HaloProtvino) | |
14ab5373 | 71 | { |
198bb1c7 | 72 | // Copy constructor |
73 | HaloProtvino.Copy(*this); | |
14ab5373 | 74 | } |
75 | ||
76 | ||
77 | //____________________________________________________________ | |
78 | AliGenHaloProtvino::~AliGenHaloProtvino() | |
79 | { | |
80 | // Destructor | |
81 | } | |
82 | ||
83 | //____________________________________________________________ | |
84 | void AliGenHaloProtvino::Init() | |
85 | { | |
86 | // Initialisation | |
154d524b | 87 | fFile = fopen(fFileName,"r"); |
88 | if (fFile) { | |
89 | printf("\n File %s opened for reading, %p ! \n ", fFileName.Data(), fFile); | |
90 | } else { | |
91 | printf("\n Opening of file %s failed, %p ! \n ", fFileName.Data(), fFile); | |
92 | } | |
eac2c8a3 | 93 | // |
94 | // | |
95 | // | |
96 | // Read file with gas pressure values | |
97 | char *name; | |
98 | ||
99 | name = gSystem->ExpandPathName("$(ALICE_ROOT)/LHC/gasPressure.dat" ); | |
100 | FILE* file = fopen(name, "r"); | |
101 | Float_t z; | |
102 | Int_t i, j; | |
103 | ||
104 | // | |
105 | // Ring 1 | |
106 | // | |
7f98ef21 | 107 | for (i = 0; i < 21; i++) |
eac2c8a3 | 108 | { |
109 | fscanf(file, "%f %f %f %f %f %f", &z, | |
110 | &fG1[i][0], &fG1[i][1], &fG1[i][2], &fG1[i][3], &fG1[i][4]); | |
111 | if (i > 0) { | |
112 | fZ1[i] = fZ1[i-1] + z; | |
113 | } else { | |
114 | fZ1[i] = 20.; | |
115 | } | |
116 | } | |
117 | // | |
118 | // Ring 2 | |
119 | // | |
120 | for (i = 0; i < 21; i++) | |
121 | { | |
122 | fscanf(file, "%f %f %f %f %f %f", &z, | |
123 | &fG2[i][0], &fG2[i][1], &fG2[i][2], &fG2[i][3], &fG2[i][4]); | |
124 | if (i > 0) { | |
125 | fZ2[i] = fZ2[i-1] + z; | |
126 | } else { | |
127 | fZ2[i] = 20.; | |
128 | } | |
129 | } | |
130 | // | |
131 | // Transform into interaction rates | |
132 | // | |
0af12c00 | 133 | const Float_t kCrossSection = 0.094e-28; // m^2 |
718e5512 | 134 | Float_t pFlux[5] = {0.2, 0.2, 0.3, 0.3, 1.0}; |
eac2c8a3 | 135 | |
136 | for (j = 0; j < 5; j++) { | |
718e5512 | 137 | pFlux[j] *= 1.e11/25.e-9; |
eac2c8a3 | 138 | for (i = 0; i < 21; i++) |
139 | { | |
0af12c00 | 140 | fG1[i][j] = fG1[i][j] * kCrossSection * pFlux[j]; // 1/m/s |
141 | fG2[i][j] = fG2[i][j] * kCrossSection * pFlux[j]; // 1/m/s | |
eac2c8a3 | 142 | } |
143 | } | |
7f98ef21 | 144 | |
eac2c8a3 | 145 | |
7f98ef21 | 146 | Float_t sum1 = 0.; |
147 | Float_t sum2 = 0.; | |
eac2c8a3 | 148 | |
7f98ef21 | 149 | for (Int_t i = 0; i < 300; i++) { |
eac2c8a3 | 150 | Float_t z = 20.+i*1.; |
151 | z*=100; | |
7f98ef21 | 152 | Float_t wgt1 = GassPressureWeight(z); |
153 | Float_t wgt2 = GassPressureWeight(-z); | |
154 | // printf("weight: %f %f %f %f %f \n", z, wgt1, wgt2, fZ1[20], fZ2[20]); | |
155 | sum1 += wgt1; | |
156 | sum2 += wgt2; | |
eac2c8a3 | 157 | } |
7f98ef21 | 158 | sum1/=250.; |
159 | sum2/=250.; | |
160 | printf("\n %f %f \n \n", sum1, sum2); | |
14ab5373 | 161 | } |
162 | ||
163 | //____________________________________________________________ | |
164 | void AliGenHaloProtvino::Generate() | |
165 | { | |
166 | // Generate from input file | |
14ab5373 | 167 | |
168 | Float_t polar[3]= {0,0,0}; | |
169 | Float_t origin[3]; | |
170 | Float_t p[3], p0; | |
7f98ef21 | 171 | Float_t tz, txy; |
14ab5373 | 172 | Float_t amass; |
14ab5373 | 173 | // |
7f98ef21 | 174 | Int_t ncols, nt; |
05df024b | 175 | Int_t nskip = 0; |
154d524b | 176 | Int_t nread = 0; |
7f98ef21 | 177 | |
178 | Float_t* zPrimary = new Float_t [fNpart]; | |
179 | Int_t * inuc = new Int_t [fNpart]; | |
180 | Int_t * ipart = new Int_t [fNpart]; | |
181 | Float_t* wgt = new Float_t [fNpart]; | |
182 | Float_t* ekin = new Float_t [fNpart]; | |
183 | Float_t* vx = new Float_t [fNpart]; | |
184 | Float_t* vy = new Float_t [fNpart]; | |
185 | Float_t* tx = new Float_t [fNpart]; | |
186 | Float_t* ty = new Float_t [fNpart]; | |
187 | ||
188 | Float_t zVertexOld = -1.e10; | |
189 | Int_t nInt = 0; // Counts number of interactions | |
190 | ||
14ab5373 | 191 | while(1) { |
7f98ef21 | 192 | // |
193 | // Load event into array | |
194 | // | |
154d524b | 195 | ncols = fscanf(fFile,"%f %d %d %f %f %f %f %f %f", |
7f98ef21 | 196 | &zPrimary[nread], &inuc[nread], &ipart[nread], &wgt[nread], |
197 | &ekin[nread], &vx[nread], &vy[nread], | |
198 | &tx[nread], &ty[nread]); | |
05df024b | 199 | |
14ab5373 | 200 | if (ncols < 0) break; |
7f98ef21 | 201 | // Skip fNskip events |
05df024b | 202 | nskip++; |
203 | if (fNpart !=-1 && nskip <= fNskip) continue; | |
7f98ef21 | 204 | // Count interactions |
205 | if (zPrimary[nread] != zVertexOld) { | |
206 | nInt++; | |
207 | zVertexOld = zPrimary[nread]; | |
208 | } | |
209 | // Count tracks | |
05df024b | 210 | nread++; |
14ab5373 | 211 | if (fNpart !=-1 && nread > fNpart) break; |
7f98ef21 | 212 | } |
213 | // | |
214 | // Mean time between interactions | |
215 | // | |
216 | Float_t dT = fTimePerEvent/nInt; // sec | |
217 | Float_t t = 0; // sec | |
218 | ||
219 | // | |
220 | // Loop over primaries | |
221 | // | |
222 | zVertexOld = -1.e10; | |
223 | Double_t arg = 0.; | |
224 | ||
225 | for (Int_t nprim = 0; nprim < fNpart; nprim++) | |
226 | { | |
227 | amass = TDatabasePDG::Instance()->GetParticle(ipart[nprim])->Mass(); | |
14ab5373 | 228 | |
229 | // | |
230 | // Momentum vector | |
231 | // | |
7f98ef21 | 232 | p0=sqrt(ekin[nprim]*ekin[nprim] + 2.*amass*ekin[nprim]); |
14ab5373 | 233 | |
7f98ef21 | 234 | txy=TMath::Sqrt(tx[nprim]*tx[nprim]+ty[nprim]*ty[nprim]); |
14ab5373 | 235 | if (txy == 1.) { |
236 | tz=0; | |
237 | } else { | |
238 | tz=-TMath::Sqrt(1.-txy); | |
239 | } | |
240 | ||
7f98ef21 | 241 | p[0] = p0*tx[nprim]; |
242 | p[1] = p0*ty[nprim]; | |
243 | p[2] =-p0*tz; | |
05df024b | 244 | |
7f98ef21 | 245 | origin[0] = vx[nprim]; |
246 | origin[1] = vy[nprim]; | |
05df024b | 247 | origin[2] = -2196.5; |
14ab5373 | 248 | |
249 | // | |
250 | // | |
251 | // Particle weight | |
252 | ||
154d524b | 253 | Float_t originP[3] = {0., 0., 0.}; |
7f98ef21 | 254 | originP[2] = zPrimary[nprim]; |
154d524b | 255 | |
256 | Float_t pP[3] = {0., 0., 0.}; | |
257 | Int_t ntP; | |
258 | ||
259 | if (fSide == -1) { | |
7f98ef21 | 260 | originP[2] = -zPrimary[nprim]; |
154d524b | 261 | origin[2] = -origin[2]; |
262 | p[2] = -p[2]; | |
263 | } | |
05df024b | 264 | |
14ab5373 | 265 | // |
7f98ef21 | 266 | // Time |
267 | // | |
268 | if (zPrimary[nprim] != zVertexOld) { | |
269 | while(arg==0.) arg = gRandom->Rndm(); | |
270 | t -= dT*TMath::Log(arg); // (sec) | |
271 | zVertexOld = zPrimary[nprim]; | |
272 | } | |
273 | ||
274 | // Get statistical weight according to local gas-pressure | |
275 | // | |
276 | fParentWeight=wgt[nprim]*GassPressureWeight(zPrimary[nprim]); | |
277 | ||
278 | if (!fAnalog || gRandom->Rndm() < fParentWeight) { | |
279 | // Pass parent particle | |
280 | // | |
642f15cf | 281 | PushTrack(0,-1,kProton,pP,originP,polar,t,kPNoProcess,ntP, fParentWeight); |
7f98ef21 | 282 | KeepTrack(ntP); |
642f15cf | 283 | PushTrack(fTrackIt,ntP,ipart[nprim],p,origin,polar,t,kPNoProcess,nt,fParentWeight); |
7f98ef21 | 284 | } |
285 | ||
286 | // | |
287 | // Both sides are considered | |
288 | // | |
154d524b | 289 | |
05df024b | 290 | if (fSide > 1) { |
7f98ef21 | 291 | fParentWeight=wgt[nprim]*GassPressureWeight(-zPrimary[nprim]); |
292 | if (!fAnalog || gRandom->Rndm() < fParentWeight) { | |
293 | origin[2] = -origin[2]; | |
294 | originP[2] = -originP[2]; | |
295 | p[2]=-p[2]; | |
642f15cf | 296 | PushTrack(0,-1,kProton,pP,originP,polar,t,kPNoProcess,ntP, fParentWeight); |
7f98ef21 | 297 | KeepTrack(ntP); |
642f15cf | 298 | PushTrack(fTrackIt,ntP,ipart[nprim],p,origin,polar,t,kPNoProcess,nt,fParentWeight); |
7f98ef21 | 299 | } |
05df024b | 300 | } |
5bfdba97 | 301 | SetHighWaterMark(nt); |
14ab5373 | 302 | } |
7f98ef21 | 303 | delete [] zPrimary; |
304 | delete [] inuc; | |
305 | delete [] ipart; | |
306 | delete [] wgt; | |
307 | delete [] ekin; | |
308 | delete [] vx; | |
309 | delete [] vy; | |
310 | delete [] tx; | |
311 | delete [] ty; | |
14ab5373 | 312 | } |
313 | ||
314 | ||
315 | AliGenHaloProtvino& AliGenHaloProtvino::operator=(const AliGenHaloProtvino& rhs) | |
316 | { | |
317 | // Assignment operator | |
198bb1c7 | 318 | rhs.Copy(*this); |
14ab5373 | 319 | return *this; |
320 | } | |
321 | ||
322 | ||
eac2c8a3 | 323 | |
14ab5373 | 324 | Float_t AliGenHaloProtvino::GassPressureWeight(Float_t zPrimary) |
325 | { | |
eac2c8a3 | 326 | // |
327 | // Return z-dependent gasspressure weight = interaction rate [1/m/s]. | |
328 | // | |
329 | Float_t weight = 0.; | |
330 | zPrimary/=100.; // m | |
331 | Float_t zAbs = TMath::Abs(zPrimary); | |
7f98ef21 | 332 | if (zPrimary > 0.) |
eac2c8a3 | 333 | { |
7f98ef21 | 334 | if (zAbs > fZ1[20]) { |
eac2c8a3 | 335 | weight = 2.e4; |
336 | } else { | |
7f98ef21 | 337 | for (Int_t i = 1; i < 21; i++) { |
eac2c8a3 | 338 | if (zAbs < fZ1[i]) { |
339 | weight = fG1[i][fRunPeriod]; | |
340 | break; | |
341 | } | |
342 | } | |
343 | } | |
344 | } else { | |
345 | if (zAbs > fZ2[20]) { | |
346 | weight = 2.e4; | |
347 | } else { | |
348 | for (Int_t i = 1; i < 21; i++) { | |
349 | if (zAbs < fZ2[i]) { | |
350 | weight = fG2[i][fRunPeriod]; | |
351 | break; | |
352 | } | |
353 | } | |
354 | } | |
355 | } | |
eac2c8a3 | 356 | return weight; |
14ab5373 | 357 | } |
358 | ||
198bb1c7 | 359 | void AliGenHaloProtvino::Copy(AliGenHaloProtvino&) const |
360 | { | |
361 | // | |
362 | // Copy | |
363 | // | |
364 | Fatal("Copy","Not implemented!\n"); | |
365 | } | |
366 | ||
367 | ||
14ab5373 | 368 | /* |
369 | # Title: README file for the sources of IR8 machine induced background | |
370 | # Author: Vadim Talanov <Vadim.Talanov@cern.ch> | |
371 | # Modified: 12-12-2000 | |
372 | ||
373 | 0. Overview | |
374 | ||
375 | There are three files, named ring.one.beta.[01,10,50].m, which | |
376 | contain the lists of background particles, induced by proton losses | |
377 | upstream of IP8 in the LHC ring one, for the beta* values of 1, 10 | |
378 | and 50 m, respectively. | |
379 | ||
380 | 1. File contents | |
381 | ||
382 | Each line in the files contains the coordinates of particle track | |
383 | crossing with the infinite plane, positioned at z=-1m, together with | |
384 | the physical properties of corresponding particle, namely: | |
385 | ||
386 | S - S coordinate of the primary interaction vertex, cm; | |
387 | N - type of the gas nuclei at interaction, 1 is H, 2 - C and 3 - O; | |
388 | I - particle ID in PDG particle numbering scheme; | |
389 | W - particle weight; | |
390 | E - particle kinetic energy, GeV; | |
391 | X - x coordinate of the crossing point, cm; | |
392 | Y - y coordinate of the crossing point, cm; | |
393 | Dx - x direction cosine; | |
394 | Dy - y direction cosine. | |
395 | ||
396 | 2. Normalisation | |
397 | ||
398 | Each file is given per unity of linear density of proton inelastic | |
399 | interactions with the gas nuclei, [1 inelastic interaction/m]. | |
400 | ||
401 | # ~/vtalanov/public/README.mib: the end. | |
402 | ||
403 | */ | |
404 | ||
405 | ||
406 | ||
407 |