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 **************************************************************************/
20 ///////////////////////////////////////////////////////////////////////////////
22 // Inner Traking System version 1 //
23 // This class contains the base procedures for the Inner Tracking System //
25 // Authors: R. Barbera, A. Morsch.
29 // NOTE: THIS IS THE COARSE pre.TDR geometry of the ITS. THIS WILL NOT WORK
30 // with the geometry or module classes or any analysis classes. You are
31 // strongly encouraged to uses AliITSv5.
33 ///////////////////////////////////////////////////////////////////////////////
38 #include "AliITShit.h"
47 //_____________________________________________________________________________
48 AliITSv1::AliITSv1() : AliITS()
51 // Default constructor for the ITS
55 //_____________________________________________________________________________
56 AliITSv1::AliITSv1(const char *name, const char *title)
60 // Standard constructor for the ITS
64 //_____________________________________________________________________________
65 void AliITSv1::CreateGeometry()
68 // Create geometry for version 1 of the ITS
71 // Create Geometry for ITS version 0
77 Float_t drcer[6] = { 0.,0.,.08,.08,0.,0. }; //CERAMICS THICKNESS
78 Float_t drepx[6] = { 0.,0.,0.,0.,.5357,.5357 }; //EPOXY THICKNESS
79 Float_t drpla[6] = { 0.,0.,0.,0.,.1786,.1786 }; //PLASTIC THICKNESS
80 Float_t dzb[6] = { 0.,0.,15.,15.,4.,4. }; //LENGTH OF BOXES
81 Float_t dphi[6] = { 72.,72.,72.,72.,50.6,45. }; //COVERED PHI-RANGE FOR LAYERS 1-6
82 Float_t rl[6] = { 3.9,7.6,14.,24.,40.,45. }; //SILICON LAYERS INNER RADIUS
83 Float_t drl[6] = { .755,.755,.809,.809,.7,.7 }; //THICKNESS OF LAYERS (in % radiation length)
84 Float_t dzl[6] = { 12.67,16.91,20.85,29.15,45.11,50.975 };//HALF LENGTH OF LAYERS
85 Float_t drpcb[6] = { 0.,0.,.06,.06,0.,0. }; //PCB THICKNESS
86 Float_t drcu[6] = { 0.,0.,.0504,.0504,.0357,.0357 }; //COPPER THICKNESS
87 Float_t drsi[6] = { 0.,0.,.006,.006,.3571,.3571 }; //SILICON THICKNESS
89 Float_t drca = 0, dzfc;
91 Float_t rend, drca_tpc, dzco, zend, dits[3], rlim, drsu, zmax;
92 Float_t zpos, dzco1, dzco2;
93 Float_t drcac[6], acone, dphii;
94 Float_t pcits[15], xltpc;
95 Float_t rzcone, rstep, r0, z0, acable, fp, dz, zi, ri;
99 Int_t *idtmed = fIdtmed->GetArray()-199;
101 // CONVERT INTO CM (RL(SI)=9.36 CM)
102 for (i = 0; i < 6; ++i) {
103 drl[i] = drl[i] / 100. * 9.36;
106 // SUPPORT ENDPLANE THICKNESS
107 drsu = 2.*0.06+1./20; // 1./20. is 1 cm of honeycomb (1/20 carbon density);
113 // CABLE THICKNESS (CONICAL CABLES CONNECTING THE LAYERS)
121 // CONE RADIUS AT 1ST LAYER
125 // FIELD CAGE HALF LENGTH
133 // PARAMETERS FOR SMALL (1/2) ITS
135 for (i = 0; i < 6; ++i) {
150 // EQUAL DISTRIBUTION INTO THE 6 LAYERS
151 rstep = drca_tpc / 6.;
152 for (i = 0; i < 6; ++i) {
153 drcac[i] = (i+1) * rstep;
156 // NUMBER OF PHI SECTORS
160 // PACK IN PHI AS MUCH AS POSSIBLE
161 // NOW PACK USING THICKNESS
163 for (i = 0; i < 6; ++i) {
168 // PHI-PACKING NOT SUFFICIENT ?
170 if (dphi[i]/45 < fp) {
171 drcac[i] = drcac[i] * fp * 45/dphi[i];
176 // --- Define ghost volume containing the six layers and fill it with air
181 gMC->Gsvolu("ITSV", "TUBE", idtmed[275], dgh, 3);
183 // --- Place the ghost volume in its mother volume (ALIC) and make it
186 gMC->Gspos("ITSV", 1, "ALIC", 0., 0., 0., 0, "ONLY");
187 gMC->Gsatt("ITSV", "SEEN", 0);
189 // ITS LAYERS (SILICON)
192 dits[1] = rl[0] + drl[0];
194 gMC->Gsvolu("ITS1", "TUBE", idtmed[199], dits, 3);
195 gMC->Gspos("ITS1", 1, "ITSV", 0., 0., 0., 0, "ONLY");
198 dits[1] = rl[1] + drl[1];
200 gMC->Gsvolu("ITS2", "TUBE", idtmed[199], dits, 3);
201 gMC->Gspos("ITS2", 1, "ITSV", 0., 0., 0., 0, "ONLY");
204 dits[1] = rl[2] + drl[2];
206 gMC->Gsvolu("ITS3", "TUBE", idtmed[224], dits, 3);
207 gMC->Gspos("ITS3", 1, "ITSV", 0., 0., 0., 0, "ONLY");
210 dits[1] = rl[3] + drl[3];
212 gMC->Gsvolu("ITS4", "TUBE", idtmed[224], dits, 3);
213 gMC->Gspos("ITS4", 1, "ITSV", 0., 0., 0., 0, "ONLY");
216 dits[1] = rl[4] + drl[4];
218 gMC->Gsvolu("ITS5", "TUBE", idtmed[249], dits, 3);
219 gMC->Gspos("ITS5", 1, "ITSV", 0., 0., 0., 0, "ONLY");
222 dits[1] = rl[5] + drl[5];
224 gMC->Gsvolu("ITS6", "TUBE", idtmed[249], dits, 3);
225 gMC->Gspos("ITS6", 1, "ITSV", 0., 0., 0., 0, "ONLY");
229 // PCB (layer #3 and #4)
231 gMC->Gsvolu("IPCB", "TUBE", idtmed[233], dits, 0);
232 for (i = 2; i < 4; ++i) {
234 dits[1] = dits[0] + drpcb[i];
235 dits[2] = dzb[i] / 2.;
236 zpos = dzl[i] + dits[2];
237 gMC->Gsposp("IPCB", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
238 gMC->Gsposp("IPCB", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
241 // COPPER (layer #3 and #4)
243 gMC->Gsvolu("ICO2", "TUBE", idtmed[234], dits, 0);
244 for (i = 2; i < 4; ++i) {
245 dits[0] = rl[i] + drpcb[i];
246 dits[1] = dits[0] + drcu[i];
247 dits[2] = dzb[i] / 2.;
248 zpos = dzl[i] + dits[2];
249 gMC->Gsposp("ICO2", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
250 gMC->Gsposp("ICO2", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
253 // CERAMICS (layer #3 and #4)
255 gMC->Gsvolu("ICER", "TUBE", idtmed[235], dits, 0);
256 for (i = 2; i < 4; ++i) {
257 dits[0] = rl[i] + drpcb[i] + drcu[i];
258 dits[1] = dits[0] + drcer[i];
259 dits[2] = dzb[i] / 2.;
260 zpos = dzl[i] + dits[2];
261 gMC->Gsposp("ICER", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
262 gMC->Gsposp("ICER", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
265 // SILICON (layer #3 and #4)
267 gMC->Gsvolu("ISI2", "TUBE", idtmed[226], dits, 0);
268 for (i = 2; i < 4; ++i) {
269 dits[0] = rl[i] + drpcb[i] + drcu[i] + drcer[i];
270 dits[1] = dits[0] + drsi[i];
271 dits[2] = dzb[i] / 2.;
272 zpos = dzl[i] + dits[2];
273 gMC->Gsposp("ISI2", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
274 gMC->Gsposp("ISI2", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
277 // PLASTIC (G10FR4) (layer #5 and #6)
279 gMC->Gsvolu("IPLA", "TUBE", idtmed[262], dits, 0);
280 for (i = 4; i < 6; ++i) {
282 dits[1] = dits[0] + drpla[i];
283 dits[2] = dzb[i] / 2.;
284 zpos = dzl[i] + dits[2];
285 gMC->Gsposp("IPLA", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
286 gMC->Gsposp("IPLA", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
289 // COPPER (layer #5 and #6)
291 gMC->Gsvolu("ICO3", "TUBE", idtmed[259], dits, 0);
292 for (i = 4; i < 6; ++i) {
293 dits[0] = rl[i] + drpla[i];
294 dits[1] = dits[0] + drcu[i];
295 dits[2] = dzb[i] / 2.;
296 zpos = dzl[i] + dits[2];
297 gMC->Gsposp("ICO3", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
298 gMC->Gsposp("ICO3", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
301 // EPOXY (layer #5 and #6)
303 gMC->Gsvolu("IEPX", "TUBE", idtmed[262], dits, 0);
304 for (i = 4; i < 6; ++i) {
305 dits[0] = rl[i] + drpla[i] + drcu[i];
306 dits[1] = dits[0] + drepx[i];
307 dits[2] = dzb[i] / 2.;
308 zpos = dzl[i] + dits[2];
309 gMC->Gsposp("IEPX", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
310 gMC->Gsposp("IEPX", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
313 // SILICON (layer #5 and #6)
315 gMC->Gsvolu("ISI3", "TUBE", idtmed[251], dits, 0);
316 for (i = 4; i < 6; ++i) {
317 dits[0] = rl[i] + drpla[i] + drcu[i] + drepx[i];
318 dits[1] = dits[0] + drsi[i];
319 dits[2] = dzb[i] / 2.;
320 zpos = dzl[i] + dits[2];
321 gMC->Gsposp("ISI3", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
322 gMC->Gsposp("ISI3", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
327 gMC->Gsvolu("ISUP", "TUBE", idtmed[274], dits, 0);
328 for (i = 0; i < 6; ++i) {
330 if (i < 5) dits[1] = rl[i];
333 zpos = dzl[i] + dzb[i] + dits[2];
334 gMC->Gsposp("ISUP", i+1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
335 gMC->Gsposp("ISUP", i+7, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
338 // CABLES (HORIZONTAL)
340 gMC->Gsvolu("ICHO", "TUBE", idtmed[278], dits, 0);
341 for (i = 0; i < 6; ++i) {
343 dits[1] = dits[0] + drca;
344 dits[2] = (rzcone + TMath::Tan(acone) * (rl[i] - rl[0]) - (dzl[i]+ dzb[i] + drsu)) / 2.;
345 zpos = dzl[i - 1] + dzb[i] + drsu + dits[2];
346 gMC->Gsposp("ICHO", i+1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
347 gMC->Gsposp("ICHO", i+7, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
349 // DEFINE A CONICAL GHOST VOLUME FOR THE PHI SEGMENTATION
356 pcits[6] = pcits[3] + TMath::Tan(acone) * (rlim - rl[0]);
357 pcits[7] = rlim - rl[0] + 3.5;
359 gMC->Gsvolu("ICMO", "PCON", idtmed[275], pcits, 9);
360 AliMatrix(idrotm[200], 90., 0., 90., 90., 180., 0.);
361 gMC->Gspos("ICMO", 1, "ITSV", 0., 0., 0., 0, "ONLY");
362 gMC->Gspos("ICMO", 2, "ITSV", 0., 0., 0., idrotm[200], "ONLY");
364 // DIVIDE INTO NSEC PHI-SECTIONS
366 gMC->Gsdvn("ICMD", "ICMO", nsec, 2);
367 gMC->Gsatt("ICMO", "SEEN", 0);
368 gMC->Gsatt("ICMD", "SEEN", 0);
373 gMC->Gsvolu("ICCO", "PCON", idtmed[278], pcits, 0);
374 for (i = 1; i < 6; ++i) {
375 pcits[0] = -dphi[i] / 2.;
378 dzco = TMath::Tan(acone) * (rl[i+1] - rl[i]);
380 dzco1 = zmax - (rzcone + TMath::Tan(acone) * (rl[5] - rl[0])) -2.;
381 dzco2 = (rlim - rl[5]) * TMath::Tan(acone);
382 if (rl[5] + dzco1 / TMath::Tan(acone) < rlim) {
388 pcits[3] = rzcone + TMath::Tan(acone) * (rl[i] - rl[0]);
389 pcits[4] = rl[i] - drcac[i] / TMath::Sin(acone);
391 pcits[6] = pcits[3] + dzco;
392 pcits[7] = rl[i] + dzco / TMath::Tan(acone) - drcac[i] / TMath::Sin(acone);
393 pcits[8] = rl[i] + dzco / TMath::Tan(acone);
395 gMC->Gsposp("ICCO", i, "ICMD", 0., 0., 0., 0, "ONLY", pcits, 9);
401 // CONICAL CABLES BELOW TPC
403 // DEFINE A CONICAL GHOST VOLUME FOR THE PHI SEGMENTATION
409 pcits[4] = pcits[5] - drca_tpc;
411 pcits[8] = pcits[4] + (pcits[6] - pcits[3]) * TMath::Tan(acable * kDegrad);
412 pcits[7] = pcits[8] - drca_tpc;
413 AliMatrix(idrotm[200], 90., 0., 90., 90., 180., 0.);
414 gMC->Gsvolu("ICCM", "PCON", idtmed[275], pcits, 9);
415 gMC->Gspos("ICCM", 1, "ALIC", 0., 0., 0., 0, "ONLY");
416 gMC->Gspos("ICCM", 2, "ALIC", 0., 0., 0., idrotm[200], "ONLY");
417 gMC->Gsdvn("ITMD", "ICCM", nsec, 2);
418 gMC->Gsatt("ITMD", "SEEN", 0);
419 gMC->Gsatt("ICCM", "SEEN", 0);
421 // NOW PLACE SEGMENTS WITH DECREASING PHI SEGMENTS INTO THE
425 gMC->Gsvolu("ITTT", "PCON", idtmed[278], pcits, 0);
428 dz = (xltpc - zend) / 9.;
429 for (i = 0; i < 9; ++i) {
430 zi = z0 + i*dz + dz / 2.;
431 ri = r0 + (zi - z0) * TMath::Tan(acable * kDegrad);
432 dphii = dphi[5] * r0 / ri;
433 pcits[0] = -dphii / 2.;
435 pcits[3] = zi - dz / 2.;
436 pcits[5] = r0 + (pcits[3] - z0) * TMath::Tan(acable * kDegrad);
437 pcits[4] = pcits[5] - drca_tpc;
438 pcits[6] = zi + dz / 2.;
439 pcits[8] = r0 + (pcits[6] - z0) * TMath::Tan(acable * kDegrad);
440 pcits[7] = pcits[8] - drca_tpc;
442 gMC->Gsposp("ITTT", i+1, "ITMD", 0., 0., 0., 0, "ONLY", pcits, 9);
445 // --- Outputs the geometry tree in the EUCLID/CAD format
448 gMC->WriteEuclid("ITSgeometry", "ITSV", 1, 5);
452 //_____________________________________________________________________________
453 void AliITSv1::CreateMaterials()
456 // Create the materials for ITS
458 AliITS::CreateMaterials();
461 //_____________________________________________________________________________
462 void AliITSv1::Init()
465 // Initialise the ITS after it has been built
472 //_____________________________________________________________________________
473 void AliITSv1::DrawModule()
476 // Draw a shaded view of the FMD version 1
480 // Set everything unseen
481 gMC->Gsatt("*", "seen", -1);
483 // Set ALIC mother visible
484 gMC->Gsatt("ALIC","SEEN",0);
486 // Set the volumes visible
487 gMC->Gsatt("ITSV","SEEN",0);
488 gMC->Gsatt("ITS1","SEEN",1);
489 gMC->Gsatt("ITS2","SEEN",1);
490 gMC->Gsatt("ITS3","SEEN",1);
491 gMC->Gsatt("ITS4","SEEN",1);
492 gMC->Gsatt("ITS5","SEEN",1);
493 gMC->Gsatt("ITS6","SEEN",1);
495 gMC->Gsatt("IPCB","SEEN",1);
496 gMC->Gsatt("ICO2","SEEN",1);
497 gMC->Gsatt("ICER","SEEN",0);
498 gMC->Gsatt("ISI2","SEEN",0);
499 gMC->Gsatt("IPLA","SEEN",0);
500 gMC->Gsatt("ICO3","SEEN",0);
501 gMC->Gsatt("IEPX","SEEN",0);
502 gMC->Gsatt("ISI3","SEEN",1);
503 gMC->Gsatt("ISUP","SEEN",0);
504 gMC->Gsatt("ICHO","SEEN",0);
505 gMC->Gsatt("ICMO","SEEN",0);
506 gMC->Gsatt("ICMD","SEEN",0);
507 gMC->Gsatt("ICCO","SEEN",1);
508 gMC->Gsatt("ICCM","SEEN",0);
509 gMC->Gsatt("ITMD","SEEN",0);
510 gMC->Gsatt("ITTT","SEEN",1);
513 gMC->Gdopt("hide", "on");
514 gMC->Gdopt("shad", "on");
515 gMC->Gsatt("*", "fill", 7);
516 gMC->SetClipBox(".");
517 gMC->SetClipBox("*", 0, 300, -300, 300, -300, 300);
519 gMC->Gdraw("alic", 40, 30, 0, 11, 10, .07, .07);
520 gMC->Gdhead(1111, "Inner Tracking System Version 1");
521 gMC->Gdman(17, 6, "MAN");
524 //_____________________________________________________________________________
525 void AliITSv1::StepManager()
528 // Called at every step in the ITS
533 TLorentzVector position, momentum;
534 TClonesArray &lhits = *fHits;
538 if(gMC->IsTrackInside()) vol[3] += 1;
539 if(gMC->IsTrackEntering()) vol[3] += 2;
540 if(gMC->IsTrackExiting()) vol[3] += 4;
541 if(gMC->IsTrackOut()) vol[3] += 8;
542 if(gMC->IsTrackDisappeared()) vol[3] += 16;
543 if(gMC->IsTrackStop()) vol[3] += 32;
544 if(gMC->IsTrackAlive()) vol[3] += 64;
546 // Fill hit structure.
547 if(gMC->TrackCharge() && gMC->Edep()) {
549 // Only entering charged tracks
550 if((id=gMC->CurrentVolID(copy))==fIdSens[0]) {
552 id=gMC->CurrentVolOffID(1,copy);
554 id=gMC->CurrentVolOffID(2,copy);
556 } else if(id==fIdSens[1]) {
558 id=gMC->CurrentVolOffID(1,copy);
560 id=gMC->CurrentVolOffID(2,copy);
562 } else if(id==fIdSens[2]) {
565 id=gMC->CurrentVolOffID(1,copy);
567 } else if(id==fIdSens[3]) {
570 id=gMC->CurrentVolOffID(1,copy);
572 } else if(id==fIdSens[4]) {
575 id=gMC->CurrentVolOffID(1,copy);
577 } else if(id==fIdSens[5]) {
580 id=gMC->CurrentVolOffID(1,copy);
583 gMC->TrackPosition(position);
584 gMC->TrackMomentum(momentum);
592 hits[7]=gMC->TrackTime();
593 new(lhits[fNhits++]) AliITShit(fIshunt,gAlice->CurrentTrack(),vol,hits);