1 ///////////////////////////////////////////////////////////////////////////////
3 // Inner Traking System version 1 //
7 <img src="picts/AliITSv1Class.gif">
10 <font size=+2 color=red>
11 <p>The responsible person for this module is
12 <a href="mailto:roberto.barbera@ct.infn.it">Roberto Barbera</a>.
18 ///////////////////////////////////////////////////////////////////////////////
31 //_____________________________________________________________________________
32 AliITSv1::AliITSv1() : AliITS()
35 // Default constructor for the ITS
39 //_____________________________________________________________________________
40 AliITSv1::AliITSv1(const char *name, const char *title)
44 // Standard constructor for the ITS
48 //_____________________________________________________________________________
49 void AliITSv1::CreateGeometry()
52 // Create geometry for version 1 of the ITS
55 // Create Geometry for ITS version 0
59 <img src="picts/AliITSv1Tree.gif">
64 <img src="picts/AliITSv1.gif">
70 Float_t drcer[6] = { 0.,0.,.08,.08,0.,0. }; //CERAMICS THICKNESS
71 Float_t drepx[6] = { 0.,0.,0.,0.,.5357,.5357 }; //EPOXY THICKNESS
72 Float_t drpla[6] = { 0.,0.,0.,0.,.1786,.1786 }; //PLASTIC THICKNESS
73 Float_t dzb[6] = { 0.,0.,15.,15.,4.,4. }; //LENGTH OF BOXES
74 Float_t dphi[6] = { 72.,72.,72.,72.,50.6,45. }; //COVERED PHI-RANGE FOR LAYERS 1-6
75 Float_t rl[6] = { 3.9,7.6,14.,24.,40.,45. }; //SILICON LAYERS INNER RADIUS
76 Float_t drl[6] = { .755,.755,.809,.809,.7,.7 }; //THICKNESS OF LAYERS (in % radiation length)
77 Float_t dzl[6] = { 12.67,16.91,20.85,29.15,45.11,50.975 };//HALF LENGTH OF LAYERS
78 Float_t drpcb[6] = { 0.,0.,.06,.06,0.,0. }; //PCB THICKNESS
79 Float_t drcu[6] = { 0.,0.,.0504,.0504,.0357,.0357 }; //COPPER THICKNESS
80 Float_t drsi[6] = { 0.,0.,.006,.006,.3571,.3571 }; //SILICON THICKNESS
82 Float_t drca = 0, dzfc;
84 Float_t rend, drca_tpc, dzco, zend, dits[3], rlim, drsu, zmax;
85 Float_t zpos, dzco1, dzco2;
86 Float_t drcac[6], acone, dphii;
87 Float_t pcits[15], xltpc;
88 Float_t rzcone, rstep, r0, z0, acable, fp, dz, zi, ri;
92 Int_t *idtmed = fIdtmed->GetArray()-199;
94 // CONVERT INTO CM (RL(SI)=9.36 CM)
95 for (i = 0; i < 6; ++i) {
96 drl[i] = drl[i] / 100. * 9.36;
99 // SUPPORT ENDPLANE THICKNESS
100 drsu = 2.*0.06+1./20; // 1./20. is 1 cm of honeycomb (1/20 carbon density);
106 // CABLE THICKNESS (CONICAL CABLES CONNECTING THE LAYERS)
114 // CONE RADIUS AT 1ST LAYER
118 // FIELD CAGE HALF LENGTH
126 // PARAMETERS FOR SMALL (1/2) ITS
128 for (i = 0; i < 6; ++i) {
143 // EQUAL DISTRIBUTION INTO THE 6 LAYERS
144 rstep = drca_tpc / 6.;
145 for (i = 0; i < 6; ++i) {
146 drcac[i] = (i+1) * rstep;
149 // NUMBER OF PHI SECTORS
153 // PACK IN PHI AS MUCH AS POSSIBLE
154 // NOW PACK USING THICKNESS
156 for (i = 0; i < 6; ++i) {
161 // PHI-PACKING NOT SUFFICIENT ?
163 if (dphi[i]/45 < fp) {
164 drcac[i] = drcac[i] * fp * 45/dphi[i];
169 // --- Define ghost volume containing the six layers and fill it with air
174 gMC->Gsvolu("ITSV", "TUBE", idtmed[275], dgh, 3);
176 // --- Place the ghost volume in its mother volume (ALIC) and make it
179 gMC->Gspos("ITSV", 1, "ALIC", 0., 0., 0., 0, "ONLY");
180 gMC->Gsatt("ITSV", "SEEN", 0);
182 // ITS LAYERS (SILICON)
185 dits[1] = rl[0] + drl[0];
187 gMC->Gsvolu("ITS1", "TUBE", idtmed[199], dits, 3);
188 gMC->Gspos("ITS1", 1, "ITSV", 0., 0., 0., 0, "ONLY");
191 dits[1] = rl[1] + drl[1];
193 gMC->Gsvolu("ITS2", "TUBE", idtmed[199], dits, 3);
194 gMC->Gspos("ITS2", 1, "ITSV", 0., 0., 0., 0, "ONLY");
197 dits[1] = rl[2] + drl[2];
199 gMC->Gsvolu("ITS3", "TUBE", idtmed[224], dits, 3);
200 gMC->Gspos("ITS3", 1, "ITSV", 0., 0., 0., 0, "ONLY");
203 dits[1] = rl[3] + drl[3];
205 gMC->Gsvolu("ITS4", "TUBE", idtmed[224], dits, 3);
206 gMC->Gspos("ITS4", 1, "ITSV", 0., 0., 0., 0, "ONLY");
209 dits[1] = rl[4] + drl[4];
211 gMC->Gsvolu("ITS5", "TUBE", idtmed[249], dits, 3);
212 gMC->Gspos("ITS5", 1, "ITSV", 0., 0., 0., 0, "ONLY");
215 dits[1] = rl[5] + drl[5];
217 gMC->Gsvolu("ITS6", "TUBE", idtmed[249], dits, 3);
218 gMC->Gspos("ITS6", 1, "ITSV", 0., 0., 0., 0, "ONLY");
222 // PCB (layer #3 and #4)
224 gMC->Gsvolu("IPCB", "TUBE", idtmed[233], dits, 0);
225 for (i = 2; i < 4; ++i) {
227 dits[1] = dits[0] + drpcb[i];
228 dits[2] = dzb[i] / 2.;
229 zpos = dzl[i] + dits[2];
230 gMC->Gsposp("IPCB", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
231 gMC->Gsposp("IPCB", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
234 // COPPER (layer #3 and #4)
236 gMC->Gsvolu("ICO2", "TUBE", idtmed[234], dits, 0);
237 for (i = 2; i < 4; ++i) {
238 dits[0] = rl[i] + drpcb[i];
239 dits[1] = dits[0] + drcu[i];
240 dits[2] = dzb[i] / 2.;
241 zpos = dzl[i] + dits[2];
242 gMC->Gsposp("ICO2", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
243 gMC->Gsposp("ICO2", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
246 // CERAMICS (layer #3 and #4)
248 gMC->Gsvolu("ICER", "TUBE", idtmed[235], dits, 0);
249 for (i = 2; i < 4; ++i) {
250 dits[0] = rl[i] + drpcb[i] + drcu[i];
251 dits[1] = dits[0] + drcer[i];
252 dits[2] = dzb[i] / 2.;
253 zpos = dzl[i] + dits[2];
254 gMC->Gsposp("ICER", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
255 gMC->Gsposp("ICER", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
258 // SILICON (layer #3 and #4)
260 gMC->Gsvolu("ISI2", "TUBE", idtmed[226], dits, 0);
261 for (i = 2; i < 4; ++i) {
262 dits[0] = rl[i] + drpcb[i] + drcu[i] + drcer[i];
263 dits[1] = dits[0] + drsi[i];
264 dits[2] = dzb[i] / 2.;
265 zpos = dzl[i] + dits[2];
266 gMC->Gsposp("ISI2", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
267 gMC->Gsposp("ISI2", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
270 // PLASTIC (G10FR4) (layer #5 and #6)
272 gMC->Gsvolu("IPLA", "TUBE", idtmed[262], dits, 0);
273 for (i = 4; i < 6; ++i) {
275 dits[1] = dits[0] + drpla[i];
276 dits[2] = dzb[i] / 2.;
277 zpos = dzl[i] + dits[2];
278 gMC->Gsposp("IPLA", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
279 gMC->Gsposp("IPLA", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
282 // COPPER (layer #5 and #6)
284 gMC->Gsvolu("ICO3", "TUBE", idtmed[259], dits, 0);
285 for (i = 4; i < 6; ++i) {
286 dits[0] = rl[i] + drpla[i];
287 dits[1] = dits[0] + drcu[i];
288 dits[2] = dzb[i] / 2.;
289 zpos = dzl[i] + dits[2];
290 gMC->Gsposp("ICO3", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
291 gMC->Gsposp("ICO3", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
294 // EPOXY (layer #5 and #6)
296 gMC->Gsvolu("IEPX", "TUBE", idtmed[262], dits, 0);
297 for (i = 4; i < 6; ++i) {
298 dits[0] = rl[i] + drpla[i] + drcu[i];
299 dits[1] = dits[0] + drepx[i];
300 dits[2] = dzb[i] / 2.;
301 zpos = dzl[i] + dits[2];
302 gMC->Gsposp("IEPX", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
303 gMC->Gsposp("IEPX", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
306 // SILICON (layer #5 and #6)
308 gMC->Gsvolu("ISI3", "TUBE", idtmed[251], dits, 0);
309 for (i = 4; i < 6; ++i) {
310 dits[0] = rl[i] + drpla[i] + drcu[i] + drepx[i];
311 dits[1] = dits[0] + drsi[i];
312 dits[2] = dzb[i] / 2.;
313 zpos = dzl[i] + dits[2];
314 gMC->Gsposp("ISI3", i-1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
315 gMC->Gsposp("ISI3", i+1, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
320 gMC->Gsvolu("ISUP", "TUBE", idtmed[274], dits, 0);
321 for (i = 0; i < 6; ++i) {
323 if (i < 5) dits[1] = rl[i];
326 zpos = dzl[i] + dzb[i] + dits[2];
327 gMC->Gsposp("ISUP", i+1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
328 gMC->Gsposp("ISUP", i+7, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
331 // CABLES (HORIZONTAL)
333 gMC->Gsvolu("ICHO", "TUBE", idtmed[278], dits, 0);
334 for (i = 0; i < 6; ++i) {
336 dits[1] = dits[0] + drca;
337 dits[2] = (rzcone + TMath::Tan(acone) * (rl[i] - rl[0]) - (dzl[i]+ dzb[i] + drsu)) / 2.;
338 zpos = dzl[i - 1] + dzb[i] + drsu + dits[2];
339 gMC->Gsposp("ICHO", i+1, "ITSV", 0., 0., zpos, 0, "ONLY", dits, 3);
340 gMC->Gsposp("ICHO", i+7, "ITSV", 0., 0.,-zpos, 0, "ONLY", dits, 3);
342 // DEFINE A CONICAL GHOST VOLUME FOR THE PHI SEGMENTATION
349 pcits[6] = pcits[3] + TMath::Tan(acone) * (rlim - rl[0]);
350 pcits[7] = rlim - rl[0] + 3.5;
352 gMC->Gsvolu("ICMO", "PCON", idtmed[275], pcits, 9);
353 AliMatrix(idrotm[200], 90., 0., 90., 90., 180., 0.);
354 gMC->Gspos("ICMO", 1, "ITSV", 0., 0., 0., 0, "ONLY");
355 gMC->Gspos("ICMO", 2, "ITSV", 0., 0., 0., idrotm[200], "ONLY");
357 // DIVIDE INTO NSEC PHI-SECTIONS
359 gMC->Gsdvn("ICMD", "ICMO", nsec, 2);
360 gMC->Gsatt("ICMO", "SEEN", 0);
361 gMC->Gsatt("ICMD", "SEEN", 0);
366 gMC->Gsvolu("ICCO", "PCON", idtmed[278], pcits, 0);
367 for (i = 1; i < 6; ++i) {
368 pcits[0] = -dphi[i] / 2.;
371 dzco = TMath::Tan(acone) * (rl[i+1] - rl[i]);
373 dzco1 = zmax - (rzcone + TMath::Tan(acone) * (rl[5] - rl[0])) -2.;
374 dzco2 = (rlim - rl[5]) * TMath::Tan(acone);
375 if (rl[5] + dzco1 / TMath::Tan(acone) < rlim) {
381 pcits[3] = rzcone + TMath::Tan(acone) * (rl[i] - rl[0]);
382 pcits[4] = rl[i] - drcac[i] / TMath::Sin(acone);
384 pcits[6] = pcits[3] + dzco;
385 pcits[7] = rl[i] + dzco / TMath::Tan(acone) - drcac[i] / TMath::Sin(acone);
386 pcits[8] = rl[i] + dzco / TMath::Tan(acone);
388 gMC->Gsposp("ICCO", i, "ICMD", 0., 0., 0., 0, "ONLY", pcits, 9);
394 // CONICAL CABLES BELOW TPC
396 // DEFINE A CONICAL GHOST VOLUME FOR THE PHI SEGMENTATION
402 pcits[4] = pcits[5] - drca_tpc;
404 pcits[8] = pcits[4] + (pcits[6] - pcits[3]) * TMath::Tan(acable * kDegrad);
405 pcits[7] = pcits[8] - drca_tpc;
406 AliMatrix(idrotm[200], 90., 0., 90., 90., 180., 0.);
407 gMC->Gsvolu("ICCM", "PCON", idtmed[275], pcits, 9);
408 gMC->Gspos("ICCM", 1, "ALIC", 0., 0., 0., 0, "ONLY");
409 gMC->Gspos("ICCM", 2, "ALIC", 0., 0., 0., idrotm[200], "ONLY");
410 gMC->Gsdvn("ITMD", "ICCM", nsec, 2);
411 gMC->Gsatt("ITMD", "SEEN", 0);
412 gMC->Gsatt("ICCM", "SEEN", 0);
414 // NOW PLACE SEGMENTS WITH DECREASING PHI SEGMENTS INTO THE
418 gMC->Gsvolu("ITTT", "PCON", idtmed[278], pcits, 0);
421 dz = (xltpc - zend) / 9.;
422 for (i = 0; i < 9; ++i) {
423 zi = z0 + i*dz + dz / 2.;
424 ri = r0 + (zi - z0) * TMath::Tan(acable * kDegrad);
425 dphii = dphi[5] * r0 / ri;
426 pcits[0] = -dphii / 2.;
428 pcits[3] = zi - dz / 2.;
429 pcits[5] = r0 + (pcits[3] - z0) * TMath::Tan(acable * kDegrad);
430 pcits[4] = pcits[5] - drca_tpc;
431 pcits[6] = zi + dz / 2.;
432 pcits[8] = r0 + (pcits[6] - z0) * TMath::Tan(acable * kDegrad);
433 pcits[7] = pcits[8] - drca_tpc;
435 gMC->Gsposp("ITTT", i+1, "ITMD", 0., 0., 0., 0, "ONLY", pcits, 9);
438 // --- Outputs the geometry tree in the EUCLID/CAD format
441 gMC->WriteEuclid("ITSgeometry", "ITSV", 1, 5);
445 //_____________________________________________________________________________
446 void AliITSv1::CreateMaterials()
449 // Create the materials for ITS
451 AliITS::CreateMaterials();
454 //_____________________________________________________________________________
455 void AliITSv1::Init()
458 // Initialise the ITS after it has been built
463 //_____________________________________________________________________________
464 void AliITSv1::DrawModule()
467 // Draw a shaded view of the FMD version 1
471 // Set everything unseen
472 gMC->Gsatt("*", "seen", -1);
474 // Set ALIC mother visible
475 gMC->Gsatt("ALIC","SEEN",0);
477 // Set the volumes visible
478 gMC->Gsatt("ITSV","SEEN",0);
479 gMC->Gsatt("ITS1","SEEN",1);
480 gMC->Gsatt("ITS2","SEEN",1);
481 gMC->Gsatt("ITS3","SEEN",1);
482 gMC->Gsatt("ITS4","SEEN",1);
483 gMC->Gsatt("ITS5","SEEN",1);
484 gMC->Gsatt("ITS6","SEEN",1);
486 gMC->Gsatt("IPCB","SEEN",1);
487 gMC->Gsatt("ICO2","SEEN",1);
488 gMC->Gsatt("ICER","SEEN",0);
489 gMC->Gsatt("ISI2","SEEN",0);
490 gMC->Gsatt("IPLA","SEEN",0);
491 gMC->Gsatt("ICO3","SEEN",0);
492 gMC->Gsatt("IEPX","SEEN",0);
493 gMC->Gsatt("ISI3","SEEN",1);
494 gMC->Gsatt("ISUP","SEEN",0);
495 gMC->Gsatt("ICHO","SEEN",0);
496 gMC->Gsatt("ICMO","SEEN",0);
497 gMC->Gsatt("ICMD","SEEN",0);
498 gMC->Gsatt("ICCO","SEEN",1);
499 gMC->Gsatt("ICCM","SEEN",0);
500 gMC->Gsatt("ITMD","SEEN",0);
501 gMC->Gsatt("ITTT","SEEN",1);
504 gMC->Gdopt("hide", "on");
505 gMC->Gdopt("shad", "on");
506 gMC->Gsatt("*", "fill", 7);
507 gMC->SetClipBox(".");
508 gMC->SetClipBox("*", 0, 300, -300, 300, -300, 300);
510 gMC->Gdraw("alic", 40, 30, 0, 11, 10, .07, .07);
511 gMC->Gdhead(1111, "Inner Tracking System Version 1");
512 gMC->Gdman(17, 6, "MAN");
515 //_____________________________________________________________________________
516 void AliITSv1::StepManager()
519 // Called at every step in the ITS
524 TLorentzVector position, momentum;
525 TClonesArray &lhits = *fHits;
527 if(gMC->TrackCharge() && gMC->Edep()) {
529 // Only entering charged tracks
530 if((id=gMC->CurrentVolID(copy))==fIdSens1) {
532 id=gMC->CurrentVolOffID(1,copy);
534 id=gMC->CurrentVolOffID(2,copy);
536 } else if(id==fIdSens2) {
538 id=gMC->CurrentVolOffID(1,copy);
540 id=gMC->CurrentVolOffID(2,copy);
542 } else if(id==fIdSens3) {
545 id=gMC->CurrentVolOffID(1,copy);
547 } else if(id==fIdSens4) {
550 id=gMC->CurrentVolOffID(1,copy);
552 } else if(id==fIdSens5) {
555 id=gMC->CurrentVolOffID(1,copy);
557 } else if(id==fIdSens6) {
560 id=gMC->CurrentVolOffID(1,copy);
563 gMC->TrackPosition(position);
564 gMC->TrackMomentum(momentum);
572 new(lhits[fNhits++]) AliITShit(fIshunt,gAlice->CurrentTrack(),vol,hits);