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 1.9 1999/10/05 08:05:09 fca
19 Minor corrections for uninitialised variables.
21 Revision 1.8 1999/09/29 09:24:20 fca
22 Introduction of the Copyright and cvs Log
26 ///////////////////////////////////////////////////////////////////////////////
28 // Inner Traking System version 1 //
29 // This class contains the base procedures for the Inner Tracking System //
31 // Authors: R. Barbera, A. Morsch.
35 // NOTE: THIS IS THE COARSE pre.TDR geometry of the ITS. THIS WILL NOT WORK
36 // with the geometry or module classes or any analysis classes. You are
37 // strongly encouraged to uses AliITSv5.
39 ///////////////////////////////////////////////////////////////////////////////
44 #include "AliITShit.h"
53 //_____________________________________________________________________________
54 AliITSv1::AliITSv1() {
56 // Default constructor for the ITS
59 fId1Name = new char*[fId1N];
68 //_____________________________________________________________________________
69 AliITSv1::AliITSv1(const char *name, const char *title) : AliITS(name, title){
71 // Standard constructor for the ITS
74 fId1Name = new char*[fId1N];
83 //_____________________________________________________________________________
84 AliITSv1::~AliITSv1() {
86 // Standard destructor for the ITS
88 for (Int_t i=0;i<fId1N;++i) delete [] fId1Name[i];
93 //_____________________________________________________________________________
94 void AliITSv1::CreateGeometry()
97 // Create geometry for version 1 of the ITS
100 // Create Geometry for ITS version 0
106 Float_t drcer[6] = { 0.,0.,.08,.08,0.,0. }; //CERAMICS THICKNESS
107 Float_t drepx[6] = { 0.,0.,0.,0.,.5357,.5357 }; //EPOXY THICKNESS
108 Float_t drpla[6] = { 0.,0.,0.,0.,.1786,.1786 }; //PLASTIC THICKNESS
109 Float_t dzb[6] = { 0.,0.,15.,15.,4.,4. }; //LENGTH OF BOXES
110 Float_t dphi[6] = { 72.,72.,72.,72.,50.6,45. }; //COVERED PHI-RANGE FOR LAYERS 1-6
111 Float_t rl[6] = { 3.9,7.6,14.,24.,40.,45. }; //SILICON LAYERS INNER RADIUS
112 Float_t drl[6] = { .755,.755,.809,.809,.7,.7 }; //THICKNESS OF LAYERS (in % radiation length)
113 Float_t dzl[6] = { 12.67,16.91,20.85,29.15,45.11,50.975 };//HALF LENGTH OF LAYERS
114 Float_t drpcb[6] = { 0.,0.,.06,.06,0.,0. }; //PCB THICKNESS
115 Float_t drcu[6] = { 0.,0.,.0504,.0504,.0357,.0357 }; //COPPER THICKNESS
116 Float_t drsi[6] = { 0.,0.,.006,.006,.3571,.3571 }; //SILICON THICKNESS
118 Float_t drca = 0, dzfc;
120 Float_t rend, drca_tpc, dzco, zend, dits[3], rlim, drsu, zmax;
121 Float_t zpos, dzco1, dzco2;
122 Float_t drcac[6], acone, dphii;
123 Float_t pcits[15], xltpc;
124 Float_t rzcone, rstep, r0, z0, acable, fp, dz, zi, ri;
128 Int_t *idtmed = fIdtmed->GetArray()-199;
130 // CONVERT INTO CM (RL(SI)=9.36 CM)
131 for (i = 0; i < 6; ++i) {
132 drl[i] = drl[i] / 100. * 9.36;
135 // SUPPORT ENDPLANE THICKNESS
136 drsu = 2.*0.06+1./20; // 1./20. is 1 cm of honeycomb (1/20 carbon density);
142 // CABLE THICKNESS (CONICAL CABLES CONNECTING THE LAYERS)
150 // CONE RADIUS AT 1ST LAYER
154 // FIELD CAGE HALF LENGTH
162 // PARAMETERS FOR SMALL (1/2) ITS
164 for (i = 0; i < 6; ++i) {
179 // EQUAL DISTRIBUTION INTO THE 6 LAYERS
180 rstep = drca_tpc / 6.;
181 for (i = 0; i < 6; ++i) {
182 drcac[i] = (i+1) * rstep;
185 // NUMBER OF PHI SECTORS
189 // PACK IN PHI AS MUCH AS POSSIBLE
190 // NOW PACK USING THICKNESS
192 for (i = 0; i < 6; ++i) {
197 // PHI-PACKING NOT SUFFICIENT ?
199 if (dphi[i]/45 < fp) {
200 drcac[i] = drcac[i] * fp * 45/dphi[i];
205 // --- Define ghost volume containing the six layers and fill it with air
210 gMC->Gsvolu("ITSV", "TUBE", idtmed[275], dgh, 3);
212 // --- Place the ghost volume in its mother volume (ALIC) and make it
215 gMC->Gspos("ITSV", 1, "ALIC", 0., 0., 0., 0, "ONLY");
216 gMC->Gsatt("ITSV", "SEEN", 0);
218 // ITS LAYERS (SILICON)
221 dits[1] = rl[0] + drl[0];
223 gMC->Gsvolu("ITS1", "TUBE", idtmed[199], dits, 3);
224 gMC->Gspos("ITS1", 1, "ITSV", 0., 0., 0., 0, "ONLY");
227 dits[1] = rl[1] + drl[1];
229 gMC->Gsvolu("ITS2", "TUBE", idtmed[199], dits, 3);
230 gMC->Gspos("ITS2", 1, "ITSV", 0., 0., 0., 0, "ONLY");
233 dits[1] = rl[2] + drl[2];
235 gMC->Gsvolu("ITS3", "TUBE", idtmed[224], dits, 3);
236 gMC->Gspos("ITS3", 1, "ITSV", 0., 0., 0., 0, "ONLY");
239 dits[1] = rl[3] + drl[3];
241 gMC->Gsvolu("ITS4", "TUBE", idtmed[224], dits, 3);
242 gMC->Gspos("ITS4", 1, "ITSV", 0., 0., 0., 0, "ONLY");
245 dits[1] = rl[4] + drl[4];
247 gMC->Gsvolu("ITS5", "TUBE", idtmed[249], dits, 3);
248 gMC->Gspos("ITS5", 1, "ITSV", 0., 0., 0., 0, "ONLY");
251 dits[1] = rl[5] + drl[5];
253 gMC->Gsvolu("ITS6", "TUBE", idtmed[249], dits, 3);
254 gMC->Gspos("ITS6", 1, "ITSV", 0., 0., 0., 0, "ONLY");
258 // PCB (layer #3 and #4)
260 gMC->Gsvolu("IPCB", "TUBE", idtmed[233], dits, 0);
261 for (i = 2; i < 4; ++i) {
263 dits[1] = dits[0] + drpcb[i];
264 dits[2] = dzb[i] / 2.;
265 zpos = dzl[i] + dits[2];
266 gMC->Gsposp("IPCB", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
267 gMC->Gsposp("IPCB", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
270 // COPPER (layer #3 and #4)
272 gMC->Gsvolu("ICO2", "TUBE", idtmed[234], dits, 0);
273 for (i = 2; i < 4; ++i) {
274 dits[0] = rl[i] + drpcb[i];
275 dits[1] = dits[0] + drcu[i];
276 dits[2] = dzb[i] / 2.;
277 zpos = dzl[i] + dits[2];
278 gMC->Gsposp("ICO2", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
279 gMC->Gsposp("ICO2", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
282 // CERAMICS (layer #3 and #4)
284 gMC->Gsvolu("ICER", "TUBE", idtmed[235], dits, 0);
285 for (i = 2; i < 4; ++i) {
286 dits[0] = rl[i] + drpcb[i] + drcu[i];
287 dits[1] = dits[0] + drcer[i];
288 dits[2] = dzb[i] / 2.;
289 zpos = dzl[i] + dits[2];
290 gMC->Gsposp("ICER", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
291 gMC->Gsposp("ICER", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
294 // SILICON (layer #3 and #4)
296 gMC->Gsvolu("ISI2", "TUBE", idtmed[226], dits, 0);
297 for (i = 2; i < 4; ++i) {
298 dits[0] = rl[i] + drpcb[i] + drcu[i] + drcer[i];
299 dits[1] = dits[0] + drsi[i];
300 dits[2] = dzb[i] / 2.;
301 zpos = dzl[i] + dits[2];
302 gMC->Gsposp("ISI2", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
303 gMC->Gsposp("ISI2", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
306 // PLASTIC (G10FR4) (layer #5 and #6)
308 gMC->Gsvolu("IPLA", "TUBE", idtmed[262], dits, 0);
309 for (i = 4; i < 6; ++i) {
311 dits[1] = dits[0] + drpla[i];
312 dits[2] = dzb[i] / 2.;
313 zpos = dzl[i] + dits[2];
314 gMC->Gsposp("IPLA", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
315 gMC->Gsposp("IPLA", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
318 // COPPER (layer #5 and #6)
320 gMC->Gsvolu("ICO3", "TUBE", idtmed[259], dits, 0);
321 for (i = 4; i < 6; ++i) {
322 dits[0] = rl[i] + drpla[i];
323 dits[1] = dits[0] + drcu[i];
324 dits[2] = dzb[i] / 2.;
325 zpos = dzl[i] + dits[2];
326 gMC->Gsposp("ICO3", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
327 gMC->Gsposp("ICO3", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
330 // EPOXY (layer #5 and #6)
332 gMC->Gsvolu("IEPX", "TUBE", idtmed[262], dits, 0);
333 for (i = 4; i < 6; ++i) {
334 dits[0] = rl[i] + drpla[i] + drcu[i];
335 dits[1] = dits[0] + drepx[i];
336 dits[2] = dzb[i] / 2.;
337 zpos = dzl[i] + dits[2];
338 gMC->Gsposp("IEPX", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
339 gMC->Gsposp("IEPX", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
342 // SILICON (layer #5 and #6)
344 gMC->Gsvolu("ISI3", "TUBE", idtmed[251], dits, 0);
345 for (i = 4; i < 6; ++i) {
346 dits[0] = rl[i] + drpla[i] + drcu[i] + drepx[i];
347 dits[1] = dits[0] + drsi[i];
348 dits[2] = dzb[i] / 2.;
349 zpos = dzl[i] + dits[2];
350 gMC->Gsposp("ISI3", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
351 gMC->Gsposp("ISI3", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
356 gMC->Gsvolu("ISUP", "TUBE", idtmed[274], dits, 0);
357 for (i = 0; i < 6; ++i) {
359 if (i < 5) dits[1] = rl[i];
362 zpos = dzl[i] + dzb[i] + dits[2];
363 gMC->Gsposp("ISUP", i+1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
364 gMC->Gsposp("ISUP", i+7, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
367 // CABLES (HORIZONTAL)
369 gMC->Gsvolu("ICHO", "TUBE", idtmed[278], dits, 0);
370 for (i = 0; i < 6; ++i) {
372 dits[1] = dits[0] + drca;
373 dits[2] = (rzcone + TMath::Tan(acone) * (rl[i] - rl[0]) - (dzl[i]+ dzb[i] + drsu)) / 2.;
374 zpos = dzl[i - 1] + dzb[i] + drsu + dits[2];
375 gMC->Gsposp("ICHO", i+1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
376 gMC->Gsposp("ICHO", i+7, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
378 // DEFINE A CONICAL GHOST VOLUME FOR THE PHI SEGMENTATION
385 pcits[6] = pcits[3] + TMath::Tan(acone) * (rlim - rl[0]);
386 pcits[7] = rlim - rl[0] + 3.5;
388 gMC->Gsvolu("ICMO", "PCON", idtmed[275], pcits, 9);
389 AliMatrix(idrotm[200], 90., 0., 90., 90., 180., 0.);
390 gMC->Gspos("ICMO", 1, "ITSV", 0., 0., 0., 0, "ONLY");
391 gMC->Gspos("ICMO", 2, "ITSV", 0., 0., 0., idrotm[200], "ONLY");
393 // DIVIDE INTO NSEC PHI-SECTIONS
395 gMC->Gsdvn("ICMD", "ICMO", nsec, 2);
396 gMC->Gsatt("ICMO", "SEEN", 0);
397 gMC->Gsatt("ICMD", "SEEN", 0);
402 gMC->Gsvolu("ICCO", "PCON", idtmed[278], pcits, 0);
403 for (i = 1; i < 6; ++i) {
404 pcits[0] = -dphi[i] / 2.;
407 dzco = TMath::Tan(acone) * (rl[i+1] - rl[i]);
409 dzco1 = zmax - (rzcone + TMath::Tan(acone) * (rl[5] - rl[0])) -2.;
410 dzco2 = (rlim - rl[5]) * TMath::Tan(acone);
411 if (rl[5] + dzco1 / TMath::Tan(acone) < rlim) {
417 pcits[3] = rzcone + TMath::Tan(acone) * (rl[i] - rl[0]);
418 pcits[4] = rl[i] - drcac[i] / TMath::Sin(acone);
420 pcits[6] = pcits[3] + dzco;
421 pcits[7] = rl[i] + dzco / TMath::Tan(acone) - drcac[i] / TMath::Sin(acone);
422 pcits[8] = rl[i] + dzco / TMath::Tan(acone);
424 gMC->Gsposp("ICCO", i, "ICMD", 0., 0., 0., 0, "ONLY", pcits, 9);
430 // CONICAL CABLES BELOW TPC
432 // DEFINE A CONICAL GHOST VOLUME FOR THE PHI SEGMENTATION
438 pcits[4] = pcits[5] - drca_tpc;
440 pcits[8] = pcits[4] + (pcits[6] - pcits[3]) * TMath::Tan(acable * kDegrad);
441 pcits[7] = pcits[8] - drca_tpc;
442 AliMatrix(idrotm[200], 90., 0., 90., 90., 180., 0.);
443 gMC->Gsvolu("ICCM", "PCON", idtmed[275], pcits, 9);
444 gMC->Gspos("ICCM", 1, "ALIC", 0., 0., 0., 0, "ONLY");
445 gMC->Gspos("ICCM", 2, "ALIC", 0., 0., 0., idrotm[200], "ONLY");
446 gMC->Gsdvn("ITMD", "ICCM", nsec, 2);
447 gMC->Gsatt("ITMD", "SEEN", 0);
448 gMC->Gsatt("ICCM", "SEEN", 0);
450 // NOW PLACE SEGMENTS WITH DECREASING PHI SEGMENTS INTO THE
454 gMC->Gsvolu("ITTT", "PCON", idtmed[278], pcits, 0);
457 dz = (xltpc - zend) / 9.;
458 for (i = 0; i < 9; ++i) {
459 zi = z0 + i*dz + dz / 2.;
460 ri = r0 + (zi - z0) * TMath::Tan(acable * kDegrad);
461 dphii = dphi[5] * r0 / ri;
462 pcits[0] = -dphii / 2.;
464 pcits[3] = zi - dz / 2.;
465 pcits[5] = r0 + (pcits[3] - z0) * TMath::Tan(acable * kDegrad);
466 pcits[4] = pcits[5] - drca_tpc;
467 pcits[6] = zi + dz / 2.;
468 pcits[8] = r0 + (pcits[6] - z0) * TMath::Tan(acable * kDegrad);
469 pcits[7] = pcits[8] - drca_tpc;
471 gMC->Gsposp("ITTT", i+1, "ITMD", 0., 0., 0., 0, "ONLY", pcits, 9);
474 // --- Outputs the geometry tree in the EUCLID/CAD format
477 gMC->WriteEuclid("ITSgeometry", "ITSV", 1, 5);
481 //_____________________________________________________________________________
482 void AliITSv1::CreateMaterials()
485 // Create the materials for ITS
487 AliITS::CreateMaterials();
490 //_____________________________________________________________________________
491 void AliITSv1::Init(){
493 // Initialise the ITS after it has been built
498 fIdName = new char*[fIdN];
499 fIdSens = new Int_t[fIdN];
500 for(i=0;i<fId1N;i++) {
501 l = strlen(fId1Name[i]);
502 fIdName[i] = new char[l+1];
503 for(j=0;j<l;j++) fIdName[i][j] = fId1Name[i][j];
504 fIdName[i][l] = '\0'; // Null terminate this string.
512 //_____________________________________________________________________________
513 void AliITSv1::DrawModule()
516 // Draw a shaded view of the FMD version 1
520 // Set everything unseen
521 gMC->Gsatt("*", "seen", -1);
523 // Set ALIC mother visible
524 gMC->Gsatt("ALIC","SEEN",0);
526 // Set the volumes visible
527 gMC->Gsatt("ITSV","SEEN",0);
528 gMC->Gsatt("ITS1","SEEN",1);
529 gMC->Gsatt("ITS2","SEEN",1);
530 gMC->Gsatt("ITS3","SEEN",1);
531 gMC->Gsatt("ITS4","SEEN",1);
532 gMC->Gsatt("ITS5","SEEN",1);
533 gMC->Gsatt("ITS6","SEEN",1);
535 gMC->Gsatt("IPCB","SEEN",1);
536 gMC->Gsatt("ICO2","SEEN",1);
537 gMC->Gsatt("ICER","SEEN",0);
538 gMC->Gsatt("ISI2","SEEN",0);
539 gMC->Gsatt("IPLA","SEEN",0);
540 gMC->Gsatt("ICO3","SEEN",0);
541 gMC->Gsatt("IEPX","SEEN",0);
542 gMC->Gsatt("ISI3","SEEN",1);
543 gMC->Gsatt("ISUP","SEEN",0);
544 gMC->Gsatt("ICHO","SEEN",0);
545 gMC->Gsatt("ICMO","SEEN",0);
546 gMC->Gsatt("ICMD","SEEN",0);
547 gMC->Gsatt("ICCO","SEEN",1);
548 gMC->Gsatt("ICCM","SEEN",0);
549 gMC->Gsatt("ITMD","SEEN",0);
550 gMC->Gsatt("ITTT","SEEN",1);
553 gMC->Gdopt("hide", "on");
554 gMC->Gdopt("shad", "on");
555 gMC->Gsatt("*", "fill", 7);
556 gMC->SetClipBox(".");
557 gMC->SetClipBox("*", 0, 300, -300, 300, -300, 300);
559 gMC->Gdraw("alic", 40, 30, 0, 11, 10, .07, .07);
560 gMC->Gdhead(1111, "Inner Tracking System Version 1");
561 gMC->Gdman(17, 6, "MAN");
564 //_____________________________________________________________________________
565 void AliITSv1::StepManager()
568 // Called at every step in the ITS
573 TLorentzVector position, momentum;
574 TClonesArray &lhits = *fHits;
578 if(gMC->IsTrackInside()) vol[3] += 1;
579 if(gMC->IsTrackEntering()) vol[3] += 2;
580 if(gMC->IsTrackExiting()) vol[3] += 4;
581 if(gMC->IsTrackOut()) vol[3] += 8;
582 if(gMC->IsTrackDisappeared()) vol[3] += 16;
583 if(gMC->IsTrackStop()) vol[3] += 32;
584 if(gMC->IsTrackAlive()) vol[3] += 64;
586 // Fill hit structure.
587 if(gMC->TrackCharge() && gMC->Edep()) {
589 // Only entering charged tracks
590 if((id=gMC->CurrentVolID(copy))==fIdSens[0]) {
592 id=gMC->CurrentVolOffID(1,copy);
594 id=gMC->CurrentVolOffID(2,copy);
596 } else if(id==fIdSens[1]) {
598 id=gMC->CurrentVolOffID(1,copy);
600 id=gMC->CurrentVolOffID(2,copy);
602 } else if(id==fIdSens[2]) {
605 id=gMC->CurrentVolOffID(1,copy);
607 } else if(id==fIdSens[3]) {
610 id=gMC->CurrentVolOffID(1,copy);
612 } else if(id==fIdSens[4]) {
615 id=gMC->CurrentVolOffID(1,copy);
617 } else if(id==fIdSens[5]) {
620 id=gMC->CurrentVolOffID(1,copy);
623 gMC->TrackPosition(position);
624 gMC->TrackMomentum(momentum);
632 hits[7]=gMC->TrackTime();
633 new(lhits[fNhits++]) AliITShit(fIshunt,gAlice->CurrentTrack(),vol,hits);
637 //____________________________________________________________________________
638 void AliITSv1::Streamer(TBuffer &R__b)
640 // Stream an object of class AliITSv1.
642 if (R__b.IsReading()) {
643 Version_t R__v = R__b.ReadVersion(); if (R__v) { }
644 AliITS::Streamer(R__b);
645 // This information does not need to be read. It is "hard wired"
646 // into this class via its creators.
648 //R__b.ReadArray(fId1Name);
650 R__b.WriteVersion(AliITSv1::IsA());
651 AliITS::Streamer(R__b);
652 // This information does not need to be saved. It is "hard wired"
653 // into this class via its creators.
655 //R__b.WriteArray(fId1Name, __COUNTER__);