1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 ///////////////////////////////////////////////////////////////////////////////
24 <img src="picts/AliPIPEClass.gif">
28 ///////////////////////////////////////////////////////////////////////////////
30 #include <TVirtualMC.h>
33 #include "AliPIPEv3.h"
38 //_____________________________________________________________________________
39 AliPIPEv3::AliPIPEv3()
42 // Default constructor for beam pipe
46 //_____________________________________________________________________________
47 AliPIPEv3::AliPIPEv3(const char *name, const char *title)
51 // Standard constructor for beam pipe
55 //_____________________________________________________________________________
56 void AliPIPEv3::CreateGeometry()
59 // Create Beam Pipe geometry
63 <img src="picts/AliPIPE.gif">
68 <img src="picts/AliPIPETree.gif">
72 Float_t tpar[3], dzmo, zpos;
73 Float_t bepar[3], alpar[3],sspar[3],flange[3],vacpar[3];
76 // const Double_t z_flange = 150;
77 //for undulated structure
78 char cn18[][5]={"CN01","CN02","CN03","CN04","CN05","CN06","CN07","CN08"};
79 char cn48[][5]={"CN21","CN22","CN23","CN24","CN25","CN26","CN27","CN28"};
80 // char undul[][5]={'BELO','UNDL'};
87 Int_t *idtmed = fIdtmed->GetArray()-1999;
88 // the mother of all beam pipes
94 gMC->Gsvolu("QQMO", "TUBE", idtmed[2015], tpar, 3);
96 // All beam pipe details as per the provisonal drawings given by Lars
99 // Beryllium beam pipe, length 56.6 cm, centered at vertex
109 gMC->Gsvolu("QQBE", "TUBE", idtmed[2004], bepar, 3);
110 gMC->Gsvolu("QAC1", "TUBE", idtmed[2015], vacpar, 3);
111 gMC->Gspos("QAC1", 1, "QQBE", 0., 0., 0., 0, "ONLY");
112 gMC->Gspos("QQBE", 1, "QQMO", 0., 0., zpos, 0, "ONLY");
114 // now beam pipes only in negative z-part for use in PMD.
116 // SS Flange 4 cm thick, 5.8 cm ID, 6.3 cm OD
120 zpos = zpos -bepar[2] - flange[2];
125 gMC->Gsvolu("QFL1", "TUBE", idtmed[2018], flange, 3);
126 gMC->Gsvolu("QAC2", "TUBE", idtmed[2015], vacpar, 3);
127 gMC->Gspos("QAC2", 1, "QFL1", 0., 0., 0., 0, "ONLY");
128 gMC->Gspos("QFL1", 1, "QQMO", 0., 0., zpos, 0, "ONLY");
130 // Aluminium alloy beam pipe, 1mm thick, 230 cm long
134 zpos = zpos - flange[2] - alpar[2];
139 gMC->Gsvolu("QQAL", "TUBE", idtmed[2003], alpar, 3);
140 gMC->Gsvolu("QAC3", "TUBE", idtmed[2015], vacpar, 3);
141 gMC->Gspos("QAC3", 1, "QQAL", 0., 0., 0., 0, "ONLY");
142 gMC->Gspos("QQAL", 1, "QQMO", 0., 0., zpos, 0, "ONLY");
145 // SS tube 2.0 cm long, 0.8 mm thick, 5.96 cm OD
150 zpos = zpos - alpar[2] - sspar[2];
155 gMC->Gsvolu("QSS1", "TUBE", idtmed[2018], sspar, 3);
156 gMC->Gsvolu("QAC4", "TUBE", idtmed[2015], vacpar, 3);
157 gMC->Gspos("QAC4", 1, "QSS1", 0., 0., 0., 0, "ONLY");
158 gMC->Gspos("QSS1", 1, "QQMO", 0., 0., zpos, 0, "ONLY");
161 // SS Flange 3 cm thick 7.4 cm OD, 5.8 cm ID
166 zpos = zpos - sspar[2] - flange[2];
171 gMC->Gsvolu("QFL2", "TUBE", idtmed[2018], flange, 3);
172 gMC->Gsvolu("QAC5", "TUBE", idtmed[2015], vacpar, 3);
173 gMC->Gspos("QAC5", 1, "QFL2", 0., 0., 0., 0, "ONLY");
174 gMC->Gspos("QFL2", 1, "QQMO", 0., 0., zpos, 0, "ONLY");
177 // SS tube 4.0 cm long, 0.8 mm thick, 5.96 cm OD
182 zpos = zpos - flange[2] - sspar[2];
187 gMC->Gsvolu("QSS2", "TUBE", idtmed[2018], sspar, 3);
188 gMC->Gsvolu("QAC6", "TUBE", idtmed[2015], vacpar, 3);
189 gMC->Gspos("QAC6", 1, "QSS2", 0., 0., 0., 0, "ONLY");
190 gMC->Gspos("QSS2", 1, "QQMO", 0., 0., zpos, 0, "ONLY");
194 // SS Bellow 8.4 cm long, 6.5 cm ID, 7.5 cm OD
195 // 0.8 mm thick material, 0.3 cm pitch.
196 // zundul=4.2, rundul=6.5, thick=0.08
202 Undulation("BELO",pitch,thick,zundul,rundul,cn18);
205 zpos = zpos - sspar[2] - bellow[2];
206 gMC->Gspos("BELO", 1, "QQMO", 0., 0., zpos, 0, "ONLY");
208 // SS tube 20.0 cm long, 0.8 mm thick, 5.96 cm OD
213 zpos = zpos - bellow[2] - sspar[2];
218 gMC->Gsvolu("QSS3", "TUBE", idtmed[2018], sspar, 3);
219 gMC->Gsvolu("QAC7", "TUBE", idtmed[2015], vacpar, 3);
220 gMC->Gspos("QAC7", 1, "QSS3", 0., 0., 0., 0, "ONLY");
221 gMC->Gspos("QSS3", 1, "QQMO", 0., 0., zpos, 0, "ONLY");
224 // SS Bellow 8.4 cm long, 6.5 cm ID, 7.5 cm OD
225 // 0.8 mm thick material, 0.3 cm pitch.
228 zpos = zpos - sspar[2] - bellow[2];
229 gMC->Gspos("BELO", 2, "QQMO", 0., 0., zpos, 0, "ONLY");
231 // SS tube 4.7 cm long, 0.8 mm thick,
236 zpos = zpos - bellow[2] - sspar[2];
241 gMC->Gsvolu("QSS4", "TUBE", idtmed[2018], sspar, 3);
242 gMC->Gsvolu("QAC8", "TUBE", idtmed[2015], vacpar, 3);
243 gMC->Gspos("QAC8", 1, "QSS4", 0., 0., 0., 0, "ONLY");
244 gMC->Gspos("QSS4", 1, "QQMO", 0., 0., zpos, 0, "ONLY");
246 // SS Flange 2.2 cm thick, ID=5.8 cm, OD=9.8 cm
251 zpos = zpos - sspar[2] - flange[2];
256 gMC->Gsvolu("QFL3", "TUBE", idtmed[2018], flange, 3);
257 gMC->Gsvolu("QAC9", "TUBE", idtmed[2015], vacpar, 3);
258 gMC->Gspos("QAC9", 1, "QFL3", 0., 0., 0., 0, "ONLY");
259 gMC->Gspos("QFL3", 1, "QQMO", 0., 0., zpos, 0, "ONLY");
261 //Total of 3150 mm from vertex on the negative side upto this point.
263 // SS tube 20.0 cm long, 0.15 cm thick, 5.8 cm ID, to support vac. pump
268 zpos = zpos - flange[2] - sspar[2];
273 gMC->Gsvolu("QSS5", "TUBE", idtmed[2018], sspar, 3);
274 gMC->Gsvolu("QA10", "TUBE", idtmed[2015], vacpar, 3);
275 gMC->Gspos("QA10", 1, "QSS5", 0., 0., 0., 0, "ONLY");
276 gMC->Gspos("QSS5", 1, "QQMO", 0., 0., zpos, 0, "ONLY");
279 // last item, undulated SS beam pipe, pitch=0.25, length= 342.0 cm
280 // material thickness 0.015 cm, ID=6.0 cm,
281 // zundul=171.0, thick=0.015, rundul=3.0
286 Undulation("UNDL",pitch,thick,zundul,rundul,cn48);
288 zpos = zpos - sspar[2] - zundul;
289 gMC->Gspos("UNDL", 1, "QQMO", 0., 0., zpos, 0, "ONLY");
291 gMC->Gspos("QQMO", 1, "ALIC", 0., 0., 0.1, 0, "ONLY");
293 // total of 6770 mm length upto this point, end of undulated beam
296 // SS flange 22*2 mm thick
302 zpos = zpos - zundul - flange[2];
307 gMC->Gsvolu("QFL4", "TUBE", idtmed[2018], flange, 3);
308 gMC->Gsvolu("QC11", "TUBE", idtmed[2015], vacpar, 3);
309 gMC->Gspos("QC11", 1, "QFL4", 0., 0., 0., 0, "ONLY");
310 gMC->Gspos("QFL4", 1, "QQMO", 0., 0., zpos, 0, "ONLY");
314 //_____________________________________________________________________________
315 void AliPIPEv3::DrawModule() const
318 // Draw a shaded view of the Beam Pipe
321 // Set everything unseen
322 gMC->Gsatt("*", "seen", -1);
324 // Set ALIC mother transparent
325 gMC->Gsatt("ALIC","SEEN",0);
327 // Set the volumes visible
328 gMC->Gsatt("QQMO","seen",1);
329 gMC->Gsatt("QQBE","seen",1);
330 gMC->Gsatt("QFL1","seen",1);
331 gMC->Gsatt("QQAL","seen",1);
332 gMC->Gsatt("QSS1","seen",1);
333 gMC->Gsatt("QFL2","seen",1);
334 gMC->Gsatt("QSS2","seen",1);
335 gMC->Gsatt("QSS3","seen",1);
336 gMC->Gsatt("QSS4","seen",1);
337 gMC->Gsatt("QFL3","seen",1);
338 gMC->Gsatt("QSS5","seen",1);
339 gMC->Gsatt("BELO","seen",1);
340 gMC->Gsatt("UNDL","seen",1);
342 gMC->Gdopt("hide", "on");
343 gMC->Gdopt("shad", "on");
344 gMC->Gsatt("*", "fill", 7);
345 gMC->SetClipBox(".");
346 gMC->SetClipBox("*", 0, 3000, -3000, 3000, -6000, 6000);
348 gMC->Gdraw("alic", 40, 30, 0, 3, 5, .04, .04);
349 gMC->Gdhead(1111, "Beam Pipe");
350 gMC->Gdman(16, 6, "MAN");
351 gMC->Gdopt("hide","off");
354 //_____________________________________________________________________________
355 void AliPIPEv3::CreateMaterials()
358 // Create materials for beam pipe
361 Int_t isxfld = gAlice->Field()->Integ();
362 Float_t sxmgmx = gAlice->Field()->Max();
364 Float_t asteel[4] = { 55.847,51.9961,58.6934,28.0855 };
365 Float_t zsteel[4] = { 26.,24.,28.,14. };
366 Float_t wsteel[4] = { .715,.18,.1,.005 };
368 Float_t epsil, stmin, tmaxfd, deemax, stemax;
373 // --- Define the various materials for GEANT ---
374 AliMaterial(5, "BERILLIUM$", 9.01, 4., 1.848, 35.3, 36.7);
375 AliMaterial(4, "ALUMINIUM$", 26.98, 13., 2.7, 8.9, 18.5);
376 AliMaterial(16, "VACUUM$ ", 1e-16, 1e-16, 1e-16, 1e16, 1e16);
377 AliMaterial(15, "AIR$ ", 14.61, 7.3, .001205, 30423.24, 67500);
378 AliMixture(19, "STAINLESS STEEL$", asteel, zsteel, 7.88, 4, wsteel);
381 // Defines tracking media parameters.
382 // Les valeurs sont commentees pour laisser le defaut
383 // a GEANT (version 3-21, page CONS200), f.m.
384 epsil = .001; // Tracking precision,
385 stemax = -1.; // Maximum displacement for multiple scat
386 tmaxfd = -20.; // Maximum angle due to field deflection
387 deemax = -.3; // Maximum fractional energy loss, DLS
392 AliMedium(15, "AIR_L3_US", 15, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
396 AliMedium(5, "BE_L3_US", 5, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
401 AliMedium(4, "AL_L3_US", 4, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
405 AliMedium(16, "VA_L3_US", 16, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
409 AliMedium(19, "ST_L3_US", 19, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
412 void AliPIPEv3::Undulation(char *undul, Float_t pitch, Float_t thick,
413 Float_t zundul, Float_t rundul, char (*cone)[5])
416 // RUNDUL : Internal radius of the undulated chamber
417 // THICK : material thickness
418 // PITCH : one-QUARTER wave of undulation (cm)
419 // ZUNDUL : half length (cm)
421 // The undulated structure is desgned as a superposition of eight CONES
422 // of suitable sizes, where the inner/outer radius of the cone increases,
423 // then decreases, each half of the wave is assumed to be a semicircle,
424 // which allows to calculate the thickness and the radii of the cone, by
425 // dividing the semicircle into 4 parts of equal arc length.
426 // Thus apear the constants 0.293 and 0.707.
429 const Float_t kConst1 = .293;
430 const Float_t kConst2 = .707;
434 Float_t dcone1[5], dcone2[5], dcone3[5], dcone4[5], dcone5[5],
435 dcone6[5], dcone7[5], dcone8[5];
436 Float_t xc, yc, zc, dundul[3];
437 Int_t *idtmed = fIdtmed->GetArray()-1999;
441 dcone1[0] = kConst1 * pitch / 2;
443 dcone1[2] = dcone1[1] + thick;
444 dcone1[3] = dcone1[1] + kConst2 * pitch;
445 dcone1[4] = dcone1[3] + thick;
447 dcone2[0] = kConst2 * pitch / 2;
448 dcone2[1] = dcone1[3];
449 dcone2[2] = dcone1[4];
450 dcone2[3] = dcone2[1] + kConst1 * pitch;
451 dcone2[4] = dcone2[3] + thick;
453 dcone3[0] = dcone2[0];
454 dcone3[1] = dcone2[3];
455 dcone3[2] = dcone2[4];
456 dcone3[3] = dcone2[1];
457 dcone3[4] = dcone2[2];
459 dcone4[0] = dcone1[0];
460 dcone4[1] = dcone1[3];
461 dcone4[2] = dcone1[4];
462 dcone4[3] = dcone1[1];
463 dcone4[4] = dcone1[2];
465 dcone5[0] = dcone1[0];
466 dcone5[1] = dcone1[1] - thick;
467 dcone5[2] = dcone1[1];
468 dcone5[3] = dcone5[1] - kConst2 * pitch;
469 dcone5[4] = dcone5[3] + thick;
471 dcone6[0] = dcone2[0];
472 dcone6[1] = dcone5[3];
473 dcone6[2] = dcone5[4];
474 dcone6[3] = dcone6[1] - kConst1 * pitch;
475 dcone6[4] = dcone6[3] + thick;
476 dcone7[0] = dcone6[0];
477 dcone7[1] = dcone6[3];
478 dcone7[2] = dcone6[4];
479 dcone7[3] = dcone5[3];
480 dcone7[4] = dcone5[4];
482 dcone8[0] = dcone5[0];
483 dcone8[1] = dcone7[3];
484 dcone8[2] = dcone7[4];
485 dcone8[3] = dcone5[1];
486 dcone8[4] = dcone5[2];
488 gMC->Gsvolu(cone[0], "CONE", idtmed[2018], dcone1, 5);
489 gMC->Gsvolu(cone[1], "CONE", idtmed[2018], dcone2, 5);
490 gMC->Gsvolu(cone[2], "CONE", idtmed[2018], dcone3, 5);
491 gMC->Gsvolu(cone[3], "CONE", idtmed[2018], dcone4, 5);
492 gMC->Gsvolu(cone[4], "CONE", idtmed[2018], dcone5, 5);
493 gMC->Gsvolu(cone[5], "CONE", idtmed[2018], dcone6, 5);
494 gMC->Gsvolu(cone[6], "CONE", idtmed[2018], dcone7, 5);
495 gMC->Gsvolu(cone[7], "CONE", idtmed[2018], dcone8, 5);
496 gMC->Gsatt(cone[0], "SEEN", 0);
497 gMC->Gsatt(cone[1], "SEEN", 0);
498 gMC->Gsatt(cone[2], "SEEN", 0);
499 gMC->Gsatt(cone[3], "SEEN", 0);
500 gMC->Gsatt(cone[4], "SEEN", 0);
501 gMC->Gsatt(cone[5], "SEEN", 0);
502 gMC->Gsatt(cone[6], "SEEN", 0);
503 gMC->Gsatt(cone[7], "SEEN", 0);
505 // DEFINE AN IMAGINARY TUBE VOLUME FOR UNDULATED CHAMBER, FILL WITH VACUUM
507 nwave = Int_t (zundul / (pitch * 2) + .1);
508 dundul[2] = pitch * 2 * nwave;
509 dundul[1] = rundul + pitch + thick * 2;
512 gMC->Gsvolu(undul, "TUBE", idtmed[2015], dundul, 3);
516 zc = -dundul[2] + dcone1[0];
517 for (j = 1; j <= nwave; ++j) {
518 gMC->Gspos(cone[0], j, undul, xc, yc, zc, 0, "ONLY");
519 zc = zc + dcone1[0] + dcone2[0];
520 gMC->Gspos(cone[1], j, undul, xc, yc, zc, 0, "ONLY");
521 zc = zc + dcone2[0] + dcone3[0];
522 gMC->Gspos(cone[2], j, undul, xc, yc, zc, 0, "ONLY");
523 zc = zc + dcone3[0] + dcone4[0];
524 gMC->Gspos(cone[3], j, undul, xc, yc, zc, 0, "ONLY");
525 zc = zc + dcone4[0] + dcone5[0];
526 gMC->Gspos(cone[4], j, undul, xc, yc, zc, 0, "ONLY");
527 zc = zc + dcone5[0] + dcone6[0];
528 gMC->Gspos(cone[5], j, undul, xc, yc, zc, 0, "ONLY");
529 zc = zc + dcone6[0] + dcone7[0];
530 gMC->Gspos(cone[6], j, undul, xc, yc, zc, 0, "ONLY");
531 zc = zc + dcone7[0] + dcone8[0];
532 gMC->Gspos(cone[7], j, undul, xc, yc, zc, 0, "ONLY");
533 zc = zc + dcone8[0] + dcone1[0];