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 1.8 1999/09/29 09:24:20 fca
19 Introduction of the Copyright and cvs Log
23 ///////////////////////////////////////////////////////////////////////////////
25 // Inner Traking System version 1 //
26 // This class contains the base procedures for the Inner Tracking System //
28 // Authors: R. Barbera, A. Morsch.
32 // NOTE: THIS IS THE COARSE pre.TDR geometry of the ITS. THIS WILL NOT WORK
33 // with the geometry or module classes or any analysis classes. You are
34 // strongly encouraged to uses AliITSv5.
36 ///////////////////////////////////////////////////////////////////////////////
41 #include "AliITShit.h"
50 //_____________________________________________________________________________
51 AliITSv1::AliITSv1() {
53 // Default constructor for the ITS
56 fId1Name = new char*[fId1N];
65 //_____________________________________________________________________________
66 AliITSv1::AliITSv1(const char *name, const char *title) : AliITS(name, title){
68 // Standard constructor for the ITS
71 fId1Name = new char*[fId1N];
80 //_____________________________________________________________________________
81 void AliITSv1::CreateGeometry()
84 // Create geometry for version 1 of the ITS
87 // Create Geometry for ITS version 0
93 Float_t drcer[6] = { 0.,0.,.08,.08,0.,0. }; //CERAMICS THICKNESS
94 Float_t drepx[6] = { 0.,0.,0.,0.,.5357,.5357 }; //EPOXY THICKNESS
95 Float_t drpla[6] = { 0.,0.,0.,0.,.1786,.1786 }; //PLASTIC THICKNESS
96 Float_t dzb[6] = { 0.,0.,15.,15.,4.,4. }; //LENGTH OF BOXES
97 Float_t dphi[6] = { 72.,72.,72.,72.,50.6,45. }; //COVERED PHI-RANGE FOR LAYERS 1-6
98 Float_t rl[6] = { 3.9,7.6,14.,24.,40.,45. }; //SILICON LAYERS INNER RADIUS
99 Float_t drl[6] = { .755,.755,.809,.809,.7,.7 }; //THICKNESS OF LAYERS (in % radiation length)
100 Float_t dzl[6] = { 12.67,16.91,20.85,29.15,45.11,50.975 };//HALF LENGTH OF LAYERS
101 Float_t drpcb[6] = { 0.,0.,.06,.06,0.,0. }; //PCB THICKNESS
102 Float_t drcu[6] = { 0.,0.,.0504,.0504,.0357,.0357 }; //COPPER THICKNESS
103 Float_t drsi[6] = { 0.,0.,.006,.006,.3571,.3571 }; //SILICON THICKNESS
105 Float_t drca = 0, dzfc;
107 Float_t rend, drca_tpc, dzco, zend, dits[3], rlim, drsu, zmax;
108 Float_t zpos, dzco1, dzco2;
109 Float_t drcac[6], acone, dphii;
110 Float_t pcits[15], xltpc;
111 Float_t rzcone, rstep, r0, z0, acable, fp, dz, zi, ri;
115 Int_t *idtmed = fIdtmed->GetArray()-199;
117 // CONVERT INTO CM (RL(SI)=9.36 CM)
118 for (i = 0; i < 6; ++i) {
119 drl[i] = drl[i] / 100. * 9.36;
122 // SUPPORT ENDPLANE THICKNESS
123 drsu = 2.*0.06+1./20; // 1./20. is 1 cm of honeycomb (1/20 carbon density);
129 // CABLE THICKNESS (CONICAL CABLES CONNECTING THE LAYERS)
137 // CONE RADIUS AT 1ST LAYER
141 // FIELD CAGE HALF LENGTH
149 // PARAMETERS FOR SMALL (1/2) ITS
151 for (i = 0; i < 6; ++i) {
166 // EQUAL DISTRIBUTION INTO THE 6 LAYERS
167 rstep = drca_tpc / 6.;
168 for (i = 0; i < 6; ++i) {
169 drcac[i] = (i+1) * rstep;
172 // NUMBER OF PHI SECTORS
176 // PACK IN PHI AS MUCH AS POSSIBLE
177 // NOW PACK USING THICKNESS
179 for (i = 0; i < 6; ++i) {
184 // PHI-PACKING NOT SUFFICIENT ?
186 if (dphi[i]/45 < fp) {
187 drcac[i] = drcac[i] * fp * 45/dphi[i];
192 // --- Define ghost volume containing the six layers and fill it with air
197 gMC->Gsvolu("ITSV", "TUBE", idtmed[275], dgh, 3);
199 // --- Place the ghost volume in its mother volume (ALIC) and make it
202 gMC->Gspos("ITSV", 1, "ALIC", 0., 0., 0., 0, "ONLY");
203 gMC->Gsatt("ITSV", "SEEN", 0);
205 // ITS LAYERS (SILICON)
208 dits[1] = rl[0] + drl[0];
210 gMC->Gsvolu("ITS1", "TUBE", idtmed[199], dits, 3);
211 gMC->Gspos("ITS1", 1, "ITSV", 0., 0., 0., 0, "ONLY");
214 dits[1] = rl[1] + drl[1];
216 gMC->Gsvolu("ITS2", "TUBE", idtmed[199], dits, 3);
217 gMC->Gspos("ITS2", 1, "ITSV", 0., 0., 0., 0, "ONLY");
220 dits[1] = rl[2] + drl[2];
222 gMC->Gsvolu("ITS3", "TUBE", idtmed[224], dits, 3);
223 gMC->Gspos("ITS3", 1, "ITSV", 0., 0., 0., 0, "ONLY");
226 dits[1] = rl[3] + drl[3];
228 gMC->Gsvolu("ITS4", "TUBE", idtmed[224], dits, 3);
229 gMC->Gspos("ITS4", 1, "ITSV", 0., 0., 0., 0, "ONLY");
232 dits[1] = rl[4] + drl[4];
234 gMC->Gsvolu("ITS5", "TUBE", idtmed[249], dits, 3);
235 gMC->Gspos("ITS5", 1, "ITSV", 0., 0., 0., 0, "ONLY");
238 dits[1] = rl[5] + drl[5];
240 gMC->Gsvolu("ITS6", "TUBE", idtmed[249], dits, 3);
241 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] + 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];
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 - 1] + 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+1] - rl[i]);
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 AliITSv1::CreateMaterials()
472 // Create the materials for ITS
474 AliITS::CreateMaterials();
477 //_____________________________________________________________________________
478 void AliITSv1::Init(){
480 // Initialise the ITS after it has been built
485 fIdName = new char*[fIdN];
486 fIdSens = new Int_t[fIdN];
487 for(i=0;i<fId1N;i++) {
488 l = strlen(fId1Name[i]);
489 fIdName[i] = new char[l+1];
490 for(j=0;j<l;j++) fIdName[i][j] = fId1Name[i][j];
491 fIdName[i][l] = '\0'; // Null terminate this string.
499 //_____________________________________________________________________________
500 void AliITSv1::DrawModule()
503 // Draw a shaded view of the FMD version 1
507 // Set everything unseen
508 gMC->Gsatt("*", "seen", -1);
510 // Set ALIC mother visible
511 gMC->Gsatt("ALIC","SEEN",0);
513 // Set the volumes visible
514 gMC->Gsatt("ITSV","SEEN",0);
515 gMC->Gsatt("ITS1","SEEN",1);
516 gMC->Gsatt("ITS2","SEEN",1);
517 gMC->Gsatt("ITS3","SEEN",1);
518 gMC->Gsatt("ITS4","SEEN",1);
519 gMC->Gsatt("ITS5","SEEN",1);
520 gMC->Gsatt("ITS6","SEEN",1);
522 gMC->Gsatt("IPCB","SEEN",1);
523 gMC->Gsatt("ICO2","SEEN",1);
524 gMC->Gsatt("ICER","SEEN",0);
525 gMC->Gsatt("ISI2","SEEN",0);
526 gMC->Gsatt("IPLA","SEEN",0);
527 gMC->Gsatt("ICO3","SEEN",0);
528 gMC->Gsatt("IEPX","SEEN",0);
529 gMC->Gsatt("ISI3","SEEN",1);
530 gMC->Gsatt("ISUP","SEEN",0);
531 gMC->Gsatt("ICHO","SEEN",0);
532 gMC->Gsatt("ICMO","SEEN",0);
533 gMC->Gsatt("ICMD","SEEN",0);
534 gMC->Gsatt("ICCO","SEEN",1);
535 gMC->Gsatt("ICCM","SEEN",0);
536 gMC->Gsatt("ITMD","SEEN",0);
537 gMC->Gsatt("ITTT","SEEN",1);
540 gMC->Gdopt("hide", "on");
541 gMC->Gdopt("shad", "on");
542 gMC->Gsatt("*", "fill", 7);
543 gMC->SetClipBox(".");
544 gMC->SetClipBox("*", 0, 300, -300, 300, -300, 300);
546 gMC->Gdraw("alic", 40, 30, 0, 11, 10, .07, .07);
547 gMC->Gdhead(1111, "Inner Tracking System Version 1");
548 gMC->Gdman(17, 6, "MAN");
551 //_____________________________________________________________________________
552 void AliITSv1::StepManager()
555 // Called at every step in the ITS
560 TLorentzVector position, momentum;
561 TClonesArray &lhits = *fHits;
565 if(gMC->IsTrackInside()) vol[3] += 1;
566 if(gMC->IsTrackEntering()) vol[3] += 2;
567 if(gMC->IsTrackExiting()) vol[3] += 4;
568 if(gMC->IsTrackOut()) vol[3] += 8;
569 if(gMC->IsTrackDisappeared()) vol[3] += 16;
570 if(gMC->IsTrackStop()) vol[3] += 32;
571 if(gMC->IsTrackAlive()) vol[3] += 64;
573 // Fill hit structure.
574 if(gMC->TrackCharge() && gMC->Edep()) {
576 // Only entering charged tracks
577 if((id=gMC->CurrentVolID(copy))==fIdSens[0]) {
579 id=gMC->CurrentVolOffID(1,copy);
581 id=gMC->CurrentVolOffID(2,copy);
583 } else if(id==fIdSens[1]) {
585 id=gMC->CurrentVolOffID(1,copy);
587 id=gMC->CurrentVolOffID(2,copy);
589 } else if(id==fIdSens[2]) {
592 id=gMC->CurrentVolOffID(1,copy);
594 } else if(id==fIdSens[3]) {
597 id=gMC->CurrentVolOffID(1,copy);
599 } else if(id==fIdSens[4]) {
602 id=gMC->CurrentVolOffID(1,copy);
604 } else if(id==fIdSens[5]) {
607 id=gMC->CurrentVolOffID(1,copy);
610 gMC->TrackPosition(position);
611 gMC->TrackMomentum(momentum);
619 hits[7]=gMC->TrackTime();
620 new(lhits[fNhits++]) AliITShit(fIshunt,gAlice->CurrentTrack(),vol,hits);
624 //____________________________________________________________________________
625 void AliITSv1::Streamer(TBuffer &R__b)
627 // Stream an object of class AliITSv1.
629 if (R__b.IsReading()) {
630 Version_t R__v = R__b.ReadVersion(); if (R__v) { }
631 AliITS::Streamer(R__b);
632 // This information does not need to be read. It is "hard wired"
633 // into this class via its creators.
635 //R__b.ReadArray(fId1Name);
637 R__b.WriteVersion(AliITSv1::IsA());
638 AliITS::Streamer(R__b);
639 // This information does not need to be saved. It is "hard wired"
640 // into this class via its creators.
642 //R__b.WriteArray(fId1Name, __COUNTER__);