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 0 //
26 <img src="picts/AliITSv0Class.gif">
29 <font size=+2 color=red>
30 <p>The responsible person for this module is
31 <a href="mailto:roberto.barbera@ct.infn.it">Roberto Barbera</a>.
37 ///////////////////////////////////////////////////////////////////////////////
50 //_____________________________________________________________________________
51 AliITSv0::AliITSv0() : AliITS()
54 // Default constructor for ITS
58 //_____________________________________________________________________________
59 AliITSv0::AliITSv0(const char *name, const char *title)
63 // Standard constructor for ITS
67 //_____________________________________________________________________________
68 void AliITSv0::CreateGeometry()
71 // Create Geometry for ITS version 0
75 <img src="picts/AliITSv0Tree.gif">
80 <img src="picts/AliITSv0.gif">
85 Float_t rl[6] = { 3.9,7.6,14.,24.,40.,45. }; //SILICON LAYERS INNER RADIUS
86 Float_t drl[6] = { .755,.755,.809,.809,.7,.7 }; //THICKNESS OF LAYERS (in % radiation length)
87 Float_t dzl[6] = { 12.67,16.91,20.85,29.15,45.11,50.975 }; //HALF LENGTH OF LAYERS
88 Float_t drpcb[6] = { 0.,0.,.06,.06,0.,0. }; //PCB THICKNESS
89 Float_t drcu[6] = { 0.,0.,.0504,.0504,.0357,.0357 }; //COPPER THICKNESS
90 Float_t drsi[6] = { 0.,0.,.006,.006,.3571,.3571 }; //SILICON THICKNESS
91 Float_t drcer[6] = { 0.,0.,.08,.08,0.,0. }; //CERAMICS THICKNESS
92 Float_t drepx[6] = { 0.,0.,0.,0.,.5357,.5357 }; //EPOXY THICKNESS
93 Float_t drpla[6] = { 0.,0.,0.,0.,.1786,.1786 }; //PLASTIC THICKNESS
94 Float_t dzb[6] = { 0.,0.,15.,15.,4.,4. }; //LENGTH OF BOXES
95 Float_t dphi[6] = { 72.,72.,72.,72.,50.6,45. }; //COVERED PHI-RANGE FOR LAYERS 1-6
100 Float_t rend, drca_tpc, dzco, zend, dits[3], rlim, drsu, zmax;
101 Float_t zpos, dzco1, dzco2;
102 Float_t drcac[6], acone, dphii;
103 Float_t pcits[15], xltpc;
104 Float_t rstep, r0, z0, acable, fp, dz, zi, ri;
109 Int_t *idtmed = fIdtmed->GetArray()-199;
111 // CONVERT INTO CM (RL(SI)=9.36 CM)
112 for (i = 0; i < 6; ++i) {
113 drl[i] = drl[i]/100. * 9.36;
116 // SUPPORT ENDPLANE THICKNESS
117 drsu = 2.*0.06 + 1./20; // 1./20. is 1 cm of honeycomb (1/20 carbon density)
119 // CABLE THICKNESS (HORIZONTAL CABLES CONNECTING THE LAYERS)
130 // CABLE THICKNESS (CONICAL CABLES CONNECTING THE LAYERS)
138 // CONE RADIUS AT 1ST LAYER
142 // FIELD CAGE HALF LENGTH
150 // PARAMETERS FOR SMALL (1/2) ITS
158 // DRCA_TPC=DRCA_TPC/2.
165 // EQUAL DISTRIBUTION INTO THE 6 LAYERS
166 rstep = drca_tpc / 6.;
167 for (i = 0; i < 6; ++i) {
168 drcac[i] = (i+1) * rstep;
171 // NUMBER OF PHI SECTORS
175 // NOW PACK USING THICKNESS
177 for (i = 0; i < 6; ++i) {
182 // PHI-PACKING NOT SUFFICIENT ?
184 if (dphi[i]/45 < fp) {
185 drcac[i] = drcac[i]*fp*45/dphi[i];
190 // --- Define ghost volume containing the six layers and fill it with air
195 gMC->Gsvolu("ITSV", "TUBE", idtmed[275], dgh, 3);
197 // --- Place the ghost volume in its mother volume (ALIC) and make it
200 gMC->Gspos("ITSV", 1, "ALIC", 0., 0., 0., 0, "ONLY");
201 gMC->Gsatt("ITSV", "SEEN", 0);
203 // ITS LAYERS (SILICON)
206 dits[1] = rl[0] + drl[0];
208 gMC->Gsvolu("ITS1", "TUBE", idtmed[199], dits, 3);
209 gMC->Gspos("ITS1", 1, "ITSV", 0., 0., 0., 0, "ONLY");
212 dits[1] = rl[1] + drl[1];
214 gMC->Gsvolu("ITS2", "TUBE", idtmed[199], dits, 3);
215 gMC->Gspos("ITS2", 1, "ITSV", 0., 0., 0., 0, "ONLY");
218 dits[1] = rl[2] + drl[2];
220 gMC->Gsvolu("ITS3", "TUBE", idtmed[224], dits, 3);
221 gMC->Gspos("ITS3", 1, "ITSV", 0., 0., 0., 0, "ONLY");
224 dits[1] = rl[3] + drl[3];
226 gMC->Gsvolu("ITS4", "TUBE", idtmed[224], dits, 3);
227 gMC->Gspos("ITS4", 1, "ITSV", 0., 0., 0., 0, "ONLY");
230 dits[1] = rl[4] + drl[4];
232 gMC->Gsvolu("ITS5", "TUBE", idtmed[249], dits, 3);
233 gMC->Gspos("ITS5", 1, "ITSV", 0., 0., 0., 0, "ONLY");
236 dits[1] = rl[5] + drl[5];
238 gMC->Gsvolu("ITS6", "TUBE", idtmed[249], dits, 3);
239 gMC->Gspos("ITS6", 1, "ITSV", 0., 0., 0., 0, "ONLY");
242 // PCB (layer #3 and #4)
244 gMC->Gsvolu("IPCB", "TUBE", idtmed[233], dits, 0);
245 for (i = 2; i < 4; ++i) {
247 dits[1] = dits[0] + drpcb[i];
248 dits[2] = dzb[i] / 2.;
249 zpos = dzl[i] + dits[2];
250 gMC->Gsposp("IPCB", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
251 gMC->Gsposp("IPCB", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
254 // COPPER (layer #3 and #4)
256 gMC->Gsvolu("ICO2", "TUBE", idtmed[234], dits, 0);
257 for (i = 2; i < 4; ++i) {
258 dits[0] = rl[i] + drpcb[i];
259 dits[1] = dits[0] + drcu[i];
260 dits[2] = dzb[i] / 2.;
261 zpos = dzl[i] + dits[2];
262 gMC->Gsposp("ICO2", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
263 gMC->Gsposp("ICO2", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
266 // CERAMICS (layer #3 and #4)
268 gMC->Gsvolu("ICER", "TUBE", idtmed[235], dits, 0);
269 for (i = 2; i < 4; ++i) {
270 dits[0] = rl[i] + drpcb[i] + drcu[i];
271 dits[1] = dits[0] + drcer[i];
272 dits[2] = dzb[i] / 2.;
273 zpos = dzl[i] + dits[2];
274 gMC->Gsposp("ICER", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
275 gMC->Gsposp("ICER", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
278 // SILICON (layer #3 and #4)
280 gMC->Gsvolu("ISI2", "TUBE", idtmed[226], dits, 0);
281 for (i = 2; i < 4; ++i) {
282 dits[0] = rl[i] + drpcb[i] + drcu[i] + drcer[i];
283 dits[1] = dits[0] + drsi[i];
284 dits[2] = dzb[i] / 2.;
285 zpos = dzl[i - 1] + dits[2];
286 gMC->Gsposp("ISI2", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
287 gMC->Gsposp("ISI2", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
290 // PLASTIC (G10FR4) (layer #5 and #6)
292 gMC->Gsvolu("IPLA", "TUBE", idtmed[262], dits, 0);
293 for (i = 4; i < 6; ++i) {
295 dits[1] = dits[0] + drpla[i];
296 dits[2] = dzb[i] / 2.;
297 zpos = dzl[i] + dits[2];
298 gMC->Gsposp("IPLA", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
299 gMC->Gsposp("IPLA", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
302 // COPPER (layer #5 and #6)
304 gMC->Gsvolu("ICO3", "TUBE", idtmed[259], dits, 0);
305 for (i = 4; i < 6; ++i) {
306 dits[0] = rl[i] + drpla[i];
307 dits[1] = dits[0] + drcu[i];
308 dits[2] = dzb[i] / 2.;
309 zpos = dzl[i] + dits[2];
310 gMC->Gsposp("ICO3", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
311 gMC->Gsposp("ICO3", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
314 // EPOXY (layer #5 and #6)
316 gMC->Gsvolu("IEPX", "TUBE", idtmed[262], dits, 0);
317 for (i = 4; i < 6; ++i) {
318 dits[0] = rl[i] + drpla[i] + drcu[i];
319 dits[1] = dits[0] + drepx[i];
320 dits[2] = dzb[i] / 2.;
321 zpos = dzl[i] + dits[2];
322 gMC->Gsposp("IEPX", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
323 gMC->Gsposp("IEPX", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
326 // SILICON (layer #5 and #6)
328 gMC->Gsvolu("ISI3", "TUBE", idtmed[251], dits, 0);
329 for (i = 4; i < 6; ++i) {
330 dits[0] = rl[i] + drpla[i] + drcu[i] + drepx[i];
331 dits[1] = dits[0] + drsi[i];
332 dits[2] = dzb[i] / 2.;
333 zpos = dzl[i] + dits[2];
334 gMC->Gsposp("ISI3", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
335 gMC->Gsposp("ISI3", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
340 gMC->Gsvolu("ISUP", "TUBE", idtmed[274], dits, 0);
341 for (i = 0; i < 6; ++i) {
343 if (i < 5) dits[1] = rl[i+1];
346 zpos = dzl[i] + dzb[i] + dits[2];
347 gMC->Gsposp("ISUP", i+1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
348 gMC->Gsposp("ISUP", i+7, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
351 // CABLES (HORIZONTAL)
353 gMC->Gsvolu("ICHO", "TUBE", idtmed[278], dits, 0);
354 for (i = 0; i < 6; ++i) {
356 dits[1] = dits[0] + drca;
357 dits[2] = (rzcone + TMath::Tan(acone) * (rl[i] - rl[0]) - (dzl[i]+ dzb[i] + drsu)) / 2.;
358 zpos = dzl[i] + dzb[i] + drsu + dits[2];
359 gMC->Gsposp("ICHO", i+1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
360 gMC->Gsposp("ICHO", i+7, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
362 // DEFINE A CONICAL GHOST VOLUME FOR THE PHI SEGMENTATION
369 pcits[6] = pcits[3] + TMath::Tan(acone) * (rlim - rl[0]);
370 pcits[7] = rlim - rl[0] + 3.5;
372 gMC->Gsvolu("ICMO", "PCON", idtmed[275], pcits, 9);
373 AliMatrix(idrotm[200], 90., 0., 90., 90., 180., 0.);
374 gMC->Gspos("ICMO", 1, "ITSV", 0., 0., 0., 0, "ONLY");
375 gMC->Gspos("ICMO", 2, "ITSV", 0., 0., 0., idrotm[200], "ONLY");
377 // DIVIDE INTO NSEC PHI-SECTIONS
379 gMC->Gsdvn("ICMD", "ICMO", nsec, 2);
380 gMC->Gsatt("ICMO", "SEEN", 0);
381 gMC->Gsatt("ICMD", "SEEN", 0);
386 gMC->Gsvolu("ICCO", "PCON", idtmed[278], pcits, 0);
387 for (i = 1; i < 6; ++i) {
388 pcits[0] = -dphi[i] / 2.;
391 dzco = TMath::Tan(acone) * (rl[i] - rl[i-1]);
393 dzco1 = zmax - (rzcone + TMath::Tan(acone) * (rl[5] - rl[0])) -2.;
394 dzco2 = (rlim - rl[5]) * TMath::Tan(acone);
395 if (rl[5] + dzco1 / TMath::Tan(acone) < rlim) {
401 pcits[3] = rzcone + TMath::Tan(acone) * (rl[i] - rl[0]);
402 pcits[4] = rl[i] - drcac[i] / TMath::Sin(acone);
404 pcits[6] = pcits[3] + dzco;
405 pcits[7] = rl[i] + dzco / TMath::Tan(acone) - drcac[i] / TMath::Sin(acone);
406 pcits[8] = rl[i] + dzco / TMath::Tan(acone);
408 gMC->Gsposp("ICCO", i, "ICMD", 0., 0., 0., 0, "ONLY", pcits, 9);
414 // CONICAL CABLES BELOW TPC
416 // DEFINE A CONICAL GHOST VOLUME FOR THE PHI SEGMENTATION
422 pcits[4] = pcits[5] - drca_tpc;
424 pcits[8] = pcits[4] + (pcits[6] - pcits[3]) * TMath::Tan(acable * kDegrad);
425 pcits[7] = pcits[8] - drca_tpc;
426 AliMatrix(idrotm[200], 90., 0., 90., 90., 180., 0.);
427 gMC->Gsvolu("ICCM", "PCON", idtmed[275], pcits, 9);
428 gMC->Gspos("ICCM", 1, "ALIC", 0., 0., 0., 0, "ONLY");
429 gMC->Gspos("ICCM", 2, "ALIC", 0., 0., 0., idrotm[200], "ONLY");
430 gMC->Gsdvn("ITMD", "ICCM", nsec, 2);
431 gMC->Gsatt("ITMD", "SEEN", 0);
432 gMC->Gsatt("ICCM", "SEEN", 0);
434 // NOW PLACE SEGMENTS WITH DECREASING PHI SEGMENTS INTO THE
438 gMC->Gsvolu("ITTT", "PCON", idtmed[278], pcits, 0);
441 dz = (xltpc - zend) / 9.;
442 for (i = 0; i < 9; ++i) {
443 zi = z0 + i* dz + dz / 2.;
444 ri = r0 + (zi - z0) * TMath::Tan(acable * kDegrad);
445 dphii = dphi[5] * r0 / ri;
446 pcits[0] = -dphii / 2.;
448 pcits[3] = zi - dz / 2.;
449 pcits[5] = r0 + (pcits[3] - z0) * TMath::Tan(acable * kDegrad);
450 pcits[4] = pcits[5] - drca_tpc;
451 pcits[6] = zi + dz / 2.;
452 pcits[8] = r0 + (pcits[6] - z0) * TMath::Tan(acable * kDegrad);
453 pcits[7] = pcits[8] - drca_tpc;
455 gMC->Gsposp("ITTT", i+1, "ITMD", 0., 0., 0., 0, "ONLY", pcits, 9);
458 // --- Outputs the geometry tree in the EUCLID/CAD format
461 gMC->WriteEuclid("ITSgeometry", "ITSV", 1, 5);
465 //_____________________________________________________________________________
466 void AliITSv0::DrawModule()
469 // Draw a shaded view of the FMD version 1
473 // Set everything unseen
474 gMC->Gsatt("*", "seen", -1);
476 // Set ALIC mother visible
477 gMC->Gsatt("ALIC","SEEN",0);
479 // Set the volumes visible
480 gMC->Gsatt("ITSV","SEEN",0);
481 gMC->Gsatt("ITS1","SEEN",1);
482 gMC->Gsatt("ITS2","SEEN",1);
483 gMC->Gsatt("ITS3","SEEN",1);
484 gMC->Gsatt("ITS4","SEEN",1);
485 gMC->Gsatt("ITS5","SEEN",1);
486 gMC->Gsatt("ITS6","SEEN",1);
487 gMC->Gsatt("ISI2","SEEN",1);
488 gMC->Gsatt("IPLA","SEEN",1);
489 gMC->Gsatt("ICHO","SEEN",1);
490 gMC->Gsatt("ICMO","SEEN",0);
491 gMC->Gsatt("ICMD","SEEN",0);
492 gMC->Gsatt("ICCO","SEEN",1);
493 gMC->Gsatt("ICCM","SEEN",0);
494 gMC->Gsatt("ITMD","SEEN",0);
495 gMC->Gsatt("ITTT","SEEN",1);
497 gMC->Gdopt("hide", "on");
498 gMC->Gdopt("shad", "on");
499 gMC->Gsatt("*", "fill", 7);
500 gMC->SetClipBox(".");
501 gMC->SetClipBox("*", 0, 300, -300, 300, -300, 300);
503 gMC->Gdraw("alic", 40, 30, 0, 11, 10, .05, .05);
504 gMC->Gdhead(1111, "Inner Tracking System Version 0");
505 gMC->Gdman(16, 6, "MAN");
508 //_____________________________________________________________________________
509 void AliITSv0::StepManager()
512 // Called at every step in the ITS
517 TLorentzVector position;
518 TLorentzVector momentum;
519 TClonesArray &lhits = *fHits;
521 if(gMC->TrackCharge() && gMC->Edep()) {
523 // Only entering charged tracks
524 if((id=gMC->CurrentVolID(copy))==fIdSens1) {
526 id=gMC->CurrentVolOffID(1,copy);
528 id=gMC->CurrentVolOffID(2,copy);
530 } else if(id==fIdSens2) {
532 id=gMC->CurrentVolOffID(1,copy);
534 id=gMC->CurrentVolOffID(2,copy);
536 } else if(id==fIdSens3) {
539 id=gMC->CurrentVolOffID(1,copy);
541 } else if(id==fIdSens4) {
544 id=gMC->CurrentVolOffID(1,copy);
546 } else if(id==fIdSens5) {
549 id=gMC->CurrentVolOffID(1,copy);
551 } else if(id==fIdSens6) {
554 id=gMC->CurrentVolOffID(1,copy);
557 gMC->TrackPosition(position);
558 gMC->TrackMomentum(momentum);
566 new(lhits[fNhits++]) AliITShit(fIshunt,gAlice->CurrentTrack(),vol,hits);