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 Revision 1.7 1999/09/29 09:24:20 fca
19 Introduction of the Copyright and cvs Log
23 ///////////////////////////////////////////////////////////////////////////////
25 // Inner Traking System version 0 //
29 <img src="picts/AliITSv0Class.gif">
32 <font size=+2 color=red>
33 <p>The responsible person for this module is
34 <a href="mailto:roberto.barbera@ct.infn.it">Roberto Barbera</a>.
40 ///////////////////////////////////////////////////////////////////////////////
53 //_____________________________________________________________________________
57 // Default constructor for ITS
61 //_____________________________________________________________________________
62 AliITSv0::AliITSv0(const char *name, const char *title)
66 // Standard constructor for ITS
70 //_____________________________________________________________________________
71 void AliITSv0::CreateGeometry()
74 // Create Geometry for ITS version 0
78 <img src="picts/AliITSv0Tree.gif">
83 <img src="picts/AliITSv0.gif">
88 Float_t rl[6] = { 3.9,7.6,14.,24.,40.,45. }; //SILICON LAYERS INNER RADIUS
89 Float_t drl[6] = { .755,.755,.809,.809,.7,.7 }; //THICKNESS OF LAYERS (in % radiation length)
90 Float_t dzl[6] = { 12.67,16.91,20.85,29.15,45.11,50.975 }; //HALF LENGTH OF LAYERS
91 Float_t drpcb[6] = { 0.,0.,.06,.06,0.,0. }; //PCB THICKNESS
92 Float_t drcu[6] = { 0.,0.,.0504,.0504,.0357,.0357 }; //COPPER THICKNESS
93 Float_t drsi[6] = { 0.,0.,.006,.006,.3571,.3571 }; //SILICON THICKNESS
94 Float_t drcer[6] = { 0.,0.,.08,.08,0.,0. }; //CERAMICS THICKNESS
95 Float_t drepx[6] = { 0.,0.,0.,0.,.5357,.5357 }; //EPOXY THICKNESS
96 Float_t drpla[6] = { 0.,0.,0.,0.,.1786,.1786 }; //PLASTIC THICKNESS
97 Float_t dzb[6] = { 0.,0.,15.,15.,4.,4. }; //LENGTH OF BOXES
98 Float_t dphi[6] = { 72.,72.,72.,72.,50.6,45. }; //COVERED PHI-RANGE FOR LAYERS 1-6
101 //Float_t dzfc, dwat;
103 Float_t rend, drca_tpc, dzco, zend, dits[3], rlim, drsu, zmax;
104 Float_t zpos, dzco1, dzco2;
105 Float_t drcac[6], acone, dphii;
106 Float_t pcits[15], xltpc;
107 Float_t rstep, r0, z0, acable, fp, dz, zi, ri;
112 Int_t *idtmed = fIdtmed->GetArray()-199;
114 // CONVERT INTO CM (RL(SI)=9.36 CM)
115 for (i = 0; i < 6; ++i) {
116 drl[i] = drl[i]/100. * 9.36;
119 // SUPPORT ENDPLANE THICKNESS
120 drsu = 2.*0.06 + 1./20; // 1./20. is 1 cm of honeycomb (1/20 carbon density)
122 // CABLE THICKNESS (HORIZONTAL CABLES CONNECTING THE LAYERS)
133 // CABLE THICKNESS (CONICAL CABLES CONNECTING THE LAYERS)
141 // CONE RADIUS AT 1ST LAYER
145 // FIELD CAGE HALF LENGTH
153 // PARAMETERS FOR SMALL (1/2) ITS
161 // DRCA_TPC=DRCA_TPC/2.
168 // EQUAL DISTRIBUTION INTO THE 6 LAYERS
169 rstep = drca_tpc / 6.;
170 for (i = 0; i < 6; ++i) {
171 drcac[i] = (i+1) * rstep;
174 // NUMBER OF PHI SECTORS
178 // NOW PACK USING THICKNESS
180 for (i = 0; i < 6; ++i) {
185 // PHI-PACKING NOT SUFFICIENT ?
187 if (dphi[i]/45 < fp) {
188 drcac[i] = drcac[i]*fp*45/dphi[i];
193 // --- Define ghost volume containing the six layers and fill it with air
198 gMC->Gsvolu("ITSV", "TUBE", idtmed[275], dgh, 3);
200 // --- Place the ghost volume in its mother volume (ALIC) and make it
203 gMC->Gspos("ITSV", 1, "ALIC", 0., 0., 0., 0, "ONLY");
204 gMC->Gsatt("ITSV", "SEEN", 0);
206 // ITS LAYERS (SILICON)
209 dits[1] = rl[0] + drl[0];
211 gMC->Gsvolu("ITS1", "TUBE", idtmed[199], dits, 3);
212 gMC->Gspos("ITS1", 1, "ITSV", 0., 0., 0., 0, "ONLY");
215 dits[1] = rl[1] + drl[1];
217 gMC->Gsvolu("ITS2", "TUBE", idtmed[199], dits, 3);
218 gMC->Gspos("ITS2", 1, "ITSV", 0., 0., 0., 0, "ONLY");
221 dits[1] = rl[2] + drl[2];
223 gMC->Gsvolu("ITS3", "TUBE", idtmed[224], dits, 3);
224 gMC->Gspos("ITS3", 1, "ITSV", 0., 0., 0., 0, "ONLY");
227 dits[1] = rl[3] + drl[3];
229 gMC->Gsvolu("ITS4", "TUBE", idtmed[224], dits, 3);
230 gMC->Gspos("ITS4", 1, "ITSV", 0., 0., 0., 0, "ONLY");
233 dits[1] = rl[4] + drl[4];
235 gMC->Gsvolu("ITS5", "TUBE", idtmed[249], dits, 3);
236 gMC->Gspos("ITS5", 1, "ITSV", 0., 0., 0., 0, "ONLY");
239 dits[1] = rl[5] + drl[5];
241 gMC->Gsvolu("ITS6", "TUBE", idtmed[249], dits, 3);
242 gMC->Gspos("ITS6", 1, "ITSV", 0., 0., 0., 0, "ONLY");
245 // PCB (layer #3 and #4)
247 gMC->Gsvolu("IPCB", "TUBE", idtmed[233], dits, 0);
248 for (i = 2; i < 4; ++i) {
250 dits[1] = dits[0] + drpcb[i];
251 dits[2] = dzb[i] / 2.;
252 zpos = dzl[i] + dits[2];
253 gMC->Gsposp("IPCB", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
254 gMC->Gsposp("IPCB", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
257 // COPPER (layer #3 and #4)
259 gMC->Gsvolu("ICO2", "TUBE", idtmed[234], dits, 0);
260 for (i = 2; i < 4; ++i) {
261 dits[0] = rl[i] + drpcb[i];
262 dits[1] = dits[0] + drcu[i];
263 dits[2] = dzb[i] / 2.;
264 zpos = dzl[i] + dits[2];
265 gMC->Gsposp("ICO2", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
266 gMC->Gsposp("ICO2", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
269 // CERAMICS (layer #3 and #4)
271 gMC->Gsvolu("ICER", "TUBE", idtmed[235], dits, 0);
272 for (i = 2; i < 4; ++i) {
273 dits[0] = rl[i] + drpcb[i] + drcu[i];
274 dits[1] = dits[0] + drcer[i];
275 dits[2] = dzb[i] / 2.;
276 zpos = dzl[i] + dits[2];
277 gMC->Gsposp("ICER", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
278 gMC->Gsposp("ICER", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
281 // SILICON (layer #3 and #4)
283 gMC->Gsvolu("ISI2", "TUBE", idtmed[226], dits, 0);
284 for (i = 2; i < 4; ++i) {
285 dits[0] = rl[i] + drpcb[i] + drcu[i] + drcer[i];
286 dits[1] = dits[0] + drsi[i];
287 dits[2] = dzb[i] / 2.;
288 zpos = dzl[i - 1] + dits[2];
289 gMC->Gsposp("ISI2", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
290 gMC->Gsposp("ISI2", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
293 // PLASTIC (G10FR4) (layer #5 and #6)
295 gMC->Gsvolu("IPLA", "TUBE", idtmed[262], dits, 0);
296 for (i = 4; i < 6; ++i) {
298 dits[1] = dits[0] + drpla[i];
299 dits[2] = dzb[i] / 2.;
300 zpos = dzl[i] + dits[2];
301 gMC->Gsposp("IPLA", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
302 gMC->Gsposp("IPLA", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
305 // COPPER (layer #5 and #6)
307 gMC->Gsvolu("ICO3", "TUBE", idtmed[259], dits, 0);
308 for (i = 4; i < 6; ++i) {
309 dits[0] = rl[i] + drpla[i];
310 dits[1] = dits[0] + drcu[i];
311 dits[2] = dzb[i] / 2.;
312 zpos = dzl[i] + dits[2];
313 gMC->Gsposp("ICO3", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
314 gMC->Gsposp("ICO3", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
317 // EPOXY (layer #5 and #6)
319 gMC->Gsvolu("IEPX", "TUBE", idtmed[262], dits, 0);
320 for (i = 4; i < 6; ++i) {
321 dits[0] = rl[i] + drpla[i] + drcu[i];
322 dits[1] = dits[0] + drepx[i];
323 dits[2] = dzb[i] / 2.;
324 zpos = dzl[i] + dits[2];
325 gMC->Gsposp("IEPX", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
326 gMC->Gsposp("IEPX", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
329 // SILICON (layer #5 and #6)
331 gMC->Gsvolu("ISI3", "TUBE", idtmed[251], dits, 0);
332 for (i = 4; i < 6; ++i) {
333 dits[0] = rl[i] + drpla[i] + drcu[i] + drepx[i];
334 dits[1] = dits[0] + drsi[i];
335 dits[2] = dzb[i] / 2.;
336 zpos = dzl[i] + dits[2];
337 gMC->Gsposp("ISI3", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
338 gMC->Gsposp("ISI3", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
343 gMC->Gsvolu("ISUP", "TUBE", idtmed[274], dits, 0);
344 for (i = 0; i < 6; ++i) {
346 if (i < 5) dits[1] = rl[i+1];
349 zpos = dzl[i] + dzb[i] + dits[2];
350 gMC->Gsposp("ISUP", i+1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
351 gMC->Gsposp("ISUP", i+7, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
354 // CABLES (HORIZONTAL)
356 gMC->Gsvolu("ICHO", "TUBE", idtmed[278], dits, 0);
357 for (i = 0; i < 6; ++i) {
359 dits[1] = dits[0] + drca;
360 dits[2] = (rzcone + TMath::Tan(acone) * (rl[i] - rl[0]) - (dzl[i]+ dzb[i] + drsu)) / 2.;
361 zpos = dzl[i] + dzb[i] + drsu + dits[2];
362 gMC->Gsposp("ICHO", i+1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
363 gMC->Gsposp("ICHO", i+7, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
365 // DEFINE A CONICAL GHOST VOLUME FOR THE PHI SEGMENTATION
372 pcits[6] = pcits[3] + TMath::Tan(acone) * (rlim - rl[0]);
373 pcits[7] = rlim - rl[0] + 3.5;
375 gMC->Gsvolu("ICMO", "PCON", idtmed[275], pcits, 9);
376 AliMatrix(idrotm[200], 90., 0., 90., 90., 180., 0.);
377 gMC->Gspos("ICMO", 1, "ITSV", 0., 0., 0., 0, "ONLY");
378 gMC->Gspos("ICMO", 2, "ITSV", 0., 0., 0., idrotm[200], "ONLY");
380 // DIVIDE INTO NSEC PHI-SECTIONS
382 gMC->Gsdvn("ICMD", "ICMO", nsec, 2);
383 gMC->Gsatt("ICMO", "SEEN", 0);
384 gMC->Gsatt("ICMD", "SEEN", 0);
389 gMC->Gsvolu("ICCO", "PCON", idtmed[278], pcits, 0);
390 for (i = 1; i < 6; ++i) {
391 pcits[0] = -dphi[i] / 2.;
394 dzco = TMath::Tan(acone) * (rl[i] - rl[i-1]);
396 dzco1 = zmax - (rzcone + TMath::Tan(acone) * (rl[5] - rl[0])) -2.;
397 dzco2 = (rlim - rl[5]) * TMath::Tan(acone);
398 if (rl[5] + dzco1 / TMath::Tan(acone) < rlim) {
404 pcits[3] = rzcone + TMath::Tan(acone) * (rl[i] - rl[0]);
405 pcits[4] = rl[i] - drcac[i] / TMath::Sin(acone);
407 pcits[6] = pcits[3] + dzco;
408 pcits[7] = rl[i] + dzco / TMath::Tan(acone) - drcac[i] / TMath::Sin(acone);
409 pcits[8] = rl[i] + dzco / TMath::Tan(acone);
411 gMC->Gsposp("ICCO", i, "ICMD", 0., 0., 0., 0, "ONLY", pcits, 9);
417 // CONICAL CABLES BELOW TPC
419 // DEFINE A CONICAL GHOST VOLUME FOR THE PHI SEGMENTATION
425 pcits[4] = pcits[5] - drca_tpc;
427 pcits[8] = pcits[4] + (pcits[6] - pcits[3]) * TMath::Tan(acable * kDegrad);
428 pcits[7] = pcits[8] - drca_tpc;
429 AliMatrix(idrotm[200], 90., 0., 90., 90., 180., 0.);
430 gMC->Gsvolu("ICCM", "PCON", idtmed[275], pcits, 9);
431 gMC->Gspos("ICCM", 1, "ALIC", 0., 0., 0., 0, "ONLY");
432 gMC->Gspos("ICCM", 2, "ALIC", 0., 0., 0., idrotm[200], "ONLY");
433 gMC->Gsdvn("ITMD", "ICCM", nsec, 2);
434 gMC->Gsatt("ITMD", "SEEN", 0);
435 gMC->Gsatt("ICCM", "SEEN", 0);
437 // NOW PLACE SEGMENTS WITH DECREASING PHI SEGMENTS INTO THE
441 gMC->Gsvolu("ITTT", "PCON", idtmed[278], pcits, 0);
444 dz = (xltpc - zend) / 9.;
445 for (i = 0; i < 9; ++i) {
446 zi = z0 + i* dz + dz / 2.;
447 ri = r0 + (zi - z0) * TMath::Tan(acable * kDegrad);
448 dphii = dphi[5] * r0 / ri;
449 pcits[0] = -dphii / 2.;
451 pcits[3] = zi - dz / 2.;
452 pcits[5] = r0 + (pcits[3] - z0) * TMath::Tan(acable * kDegrad);
453 pcits[4] = pcits[5] - drca_tpc;
454 pcits[6] = zi + dz / 2.;
455 pcits[8] = r0 + (pcits[6] - z0) * TMath::Tan(acable * kDegrad);
456 pcits[7] = pcits[8] - drca_tpc;
458 gMC->Gsposp("ITTT", i+1, "ITMD", 0., 0., 0., 0, "ONLY", pcits, 9);
461 // --- Outputs the geometry tree in the EUCLID/CAD format
464 gMC->WriteEuclid("ITSgeometry", "ITSV", 1, 5);
468 //_____________________________________________________________________________
469 void AliITSv0::DrawModule()
472 // Draw a shaded view of the FMD version 1
476 // Set everything unseen
477 gMC->Gsatt("*", "seen", -1);
479 // Set ALIC mother visible
480 gMC->Gsatt("ALIC","SEEN",0);
482 // Set the volumes visible
483 gMC->Gsatt("ITSV","SEEN",0);
484 gMC->Gsatt("ITS1","SEEN",1);
485 gMC->Gsatt("ITS2","SEEN",1);
486 gMC->Gsatt("ITS3","SEEN",1);
487 gMC->Gsatt("ITS4","SEEN",1);
488 gMC->Gsatt("ITS5","SEEN",1);
489 gMC->Gsatt("ITS6","SEEN",1);
490 gMC->Gsatt("ISI2","SEEN",1);
491 gMC->Gsatt("IPLA","SEEN",1);
492 gMC->Gsatt("ICHO","SEEN",1);
493 gMC->Gsatt("ICMO","SEEN",0);
494 gMC->Gsatt("ICMD","SEEN",0);
495 gMC->Gsatt("ICCO","SEEN",1);
496 gMC->Gsatt("ICCM","SEEN",0);
497 gMC->Gsatt("ITMD","SEEN",0);
498 gMC->Gsatt("ITTT","SEEN",1);
500 gMC->Gdopt("hide", "on");
501 gMC->Gdopt("shad", "on");
502 gMC->Gsatt("*", "fill", 7);
503 gMC->SetClipBox(".");
504 gMC->SetClipBox("*", 0, 300, -300, 300, -300, 300);
506 gMC->Gdraw("alic", 40, 30, 0, 11, 10, .05, .05);
507 gMC->Gdhead(1111, "Inner Tracking System Version 0");
508 gMC->Gdman(16, 6, "MAN");
511 //_____________________________________________________________________________
512 void AliITSv0::StepManager()
515 // Called at every step in the ITS
520 TLorentzVector position;
521 TLorentzVector momentum;
522 TClonesArray &lhits = *fHits;
524 if(gMC->TrackCharge() && gMC->Edep()) {
526 // Only entering charged tracks
527 if((id=gMC->CurrentVolID(copy))==fIdSens1) {
529 id=gMC->CurrentVolOffID(1,copy);
531 id=gMC->CurrentVolOffID(2,copy);
533 } else if(id==fIdSens2) {
535 id=gMC->CurrentVolOffID(1,copy);
537 id=gMC->CurrentVolOffID(2,copy);
539 } else if(id==fIdSens3) {
542 id=gMC->CurrentVolOffID(1,copy);
544 } else if(id==fIdSens4) {
547 id=gMC->CurrentVolOffID(1,copy);
549 } else if(id==fIdSens5) {
552 id=gMC->CurrentVolOffID(1,copy);
554 } else if(id==fIdSens6) {
557 id=gMC->CurrentVolOffID(1,copy);
560 gMC->TrackPosition(position);
561 gMC->TrackMomentum(momentum);
569 new(lhits[fNhits++]) AliITShit(fIshunt,gAlice->CurrentTrack(),vol,hits);