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 **************************************************************************/
16 /* $Id: AliTRDgtuTMU.cxx 28397 2008-09-02 09:33:00Z cblume $ */
18 ////////////////////////////////////////////////////////////////////////////
20 // Track Matching Unit (TMU) simulation //
22 // Author: J. Klein (Jochen.Klein@cern.ch) //
24 ////////////////////////////////////////////////////////////////////////////
31 #include "AliESDEvent.h"
32 #include "AliESDTrdTrack.h"
35 #include "AliTRDgeometry.h"
36 #include "AliTRDpadPlane.h"
38 #include "AliTRDgtuParam.h"
39 #include "AliTRDgtuTMU.h"
40 #include "AliTRDtrackGTU.h"
42 ClassImp(AliTRDgtuTMU)
44 AliTRDgtuTMU::AliTRDgtuTMU(Int_t stack, Int_t sector) :
47 fTrackletsPostInput(0x0),
48 fZChannelTracklets(0x0),
54 // constructor which initializes the position information of the TMU
56 fGtuParam = AliTRDgtuParam::Instance();
58 // store tracklets per link
59 fTracklets = new TObjArray*[fGtuParam->GetNLinks()];
60 for (Int_t iLink = 0; iLink < fGtuParam->GetNLinks(); iLink++) {
61 fTracklets[iLink] = new TObjArray();
64 // tracklets after input units per layer
65 fTrackletsPostInput = new TObjArray*[fGtuParam->GetNLayers()];
66 fZChannelTracklets = new TList*[fGtuParam->GetNLayers()];
67 for (Int_t layer = 0; layer < fGtuParam->GetNLayers(); layer++) {
68 fZChannelTracklets[layer] = new TList[fGtuParam->GetNZChannels()];
69 fTrackletsPostInput[layer] = new TObjArray();
72 fTracks = new TList*[fGtuParam->GetNZChannels()];
73 for (Int_t zch = 0; zch < fGtuParam->GetNZChannels(); zch++) {
74 fTracks[zch] = new TList[fGtuParam->GetNRefLayers()];
83 AliTRDgtuTMU::~AliTRDgtuTMU()
87 for (Int_t zch = 0; zch < fGtuParam->GetNZChannels(); zch++) {
88 delete [] fTracks[zch];
91 for (Int_t layer = 0; layer < fGtuParam->GetNLayers(); layer++) {
92 delete [] fZChannelTracklets[layer];
93 // delete [] fTrackletsPostInput[layer];
95 delete [] fZChannelTracklets;
96 // delete [] fTrackletsPostInput;
98 for (Int_t iLink = 0; iLink < fGtuParam->GetNLinks(); iLink++) {
99 delete fTracklets[iLink];
101 delete [] fTracklets;
104 Bool_t AliTRDgtuTMU::SetSector(Int_t sector)
108 if (sector > -1 && sector < fGtuParam->GetGeo()->Nsector() ) {
113 AliError(Form("Invalid sector given: %i", sector));
117 Bool_t AliTRDgtuTMU::SetStack(Int_t stack)
119 // Set the stack (necessary for tracking)
121 if (stack > -1 && stack < fGtuParam->GetGeo()->Nstack() ) {
126 AliError(Form("Invalid stack given: %i", stack));
130 Bool_t AliTRDgtuTMU::Reset()
134 for (Int_t zch = 0; zch < fGtuParam->GetNZChannels(); zch++) {
135 for (Int_t reflayeridx = 0; reflayeridx < fGtuParam->GetNRefLayers(); reflayeridx++) {
136 fTracks[zch][reflayeridx].Clear();
140 // delete all added tracklets
141 for (Int_t iLink = 0; iLink < fGtuParam->GetNLinks(); iLink++) {
142 fTracklets[iLink]->Clear();
144 for (Int_t layer = 0; layer < fGtuParam->GetNLinks()/2; layer++) {
145 fTrackletsPostInput[layer]->Clear();
146 for (Int_t zch = 0; zch < fGtuParam->GetNZChannels(); zch++)
147 fZChannelTracklets[layer][zch].Clear();
156 Bool_t AliTRDgtuTMU::AddTracklet(AliTRDtrackletGTU *tracklet, Int_t link)
158 // add a tracklet on the given link
160 fTracklets[link]->Add(tracklet);
165 Bool_t AliTRDgtuTMU::RunTMU(TList *ListOfTracks, AliESDEvent *esd)
167 // performs the analysis as in a TMU module of the GTU, i. e.
169 // calculation of track parameteres (pt, deflection, ???)
171 if (fStack < 0 || fSector < 0) {
172 AliError("No valid stack/sector set for this TMU! No tracking!");
176 // ----- Input units -----
177 AliDebug(1,"--------- Running Input units ----------");
178 for (Int_t layer = 0; layer < fGtuParam->GetNLayers(); layer++) {
179 if (!RunInputUnit(layer)) {
180 AliError(Form("Input unit in layer %i failed", layer));
185 // ----- Z-channel units -----
186 AliDebug(1,"--------- Running Z-channel units ----------");
187 for (Int_t layer = 0; layer < fGtuParam->GetNLayers(); layer++) {
188 fZChannelTracklets[layer] = new TList[fGtuParam->GetNZChannels()];
189 if (!RunZChannelUnit(layer)) {
190 AliError(Form("Z-Channel unit in layer %i failed", layer));
195 // ----- track finding -----
196 AliDebug(1,"--------- Running tracking units ----------");
197 for (Int_t zch = 0; zch < fGtuParam->GetNZChannels(); zch++) {
198 if (!RunTrackFinder(zch, ListOfTracks)) {
199 AliError(Form("Track Finder in z-channel %i failed", zch));
204 // ----- Track Merging -----
205 if (!RunTrackMerging(ListOfTracks)) {
206 AliError("Track merging failed");
210 // ----- track reconstruction -----
211 if (!RunTrackReconstruction(ListOfTracks)) {
212 AliError("Track reconstruction failed");
217 TIter next(ListOfTracks);
218 while (AliTRDtrackGTU *trk = (AliTRDtrackGTU*) next()) {
219 AliESDTrdTrack *trdtrack = trk->CreateTrdTrack();
220 esd->AddTrdTrack(trdtrack);
228 Bool_t AliTRDgtuTMU::RunInputUnit(Int_t layer)
230 // precalculations for the tracking and reconstruction
232 Int_t iTrkl0 = 0; // A-side tracklet
233 Int_t iTrkl1 = 0; // B-side tracklet
235 while ((iTrkl0 < fTracklets[2*layer + 0]->GetEntriesFast()) || (iTrkl1 < fTracklets[2*layer + 1]->GetEntriesFast())) {
236 if (iTrkl1 >= fTracklets[2*layer + 1]->GetEntriesFast()) {
237 fTrackletsPostInput[layer]->AddLast(fTracklets[2*layer + 0]->At(iTrkl0));
241 if (iTrkl0 >= fTracklets[2*layer + 0]->GetEntriesFast()) {
242 fTrackletsPostInput[layer]->AddLast(fTracklets[2*layer + 1]->At(iTrkl1));
246 if (((AliTRDtrackletGTU*) fTracklets[2*layer + 1]->At(iTrkl1))->GetZbin() <
247 ((AliTRDtrackletGTU*) fTracklets[2*layer + 0]->At(iTrkl0))->GetZbin()) {
248 fTrackletsPostInput[layer]->AddLast(fTracklets[2*layer + 1]->At(iTrkl1));
253 fTrackletsPostInput[layer]->AddLast(fTracklets[2*layer + 0]->At(iTrkl0));
260 TIter next(fTrackletsPostInput[layer]);
262 while ( AliTRDtrackletGTU *trk = (AliTRDtrackletGTU*) next() ) {
263 trk->SetIndex(fTrackletsPostInput[layer]->IndexOf(trk));
265 Int_t alpha = (trk->GetYbin() >> fGtuParam->GetBitExcessY()) * fGtuParam->GetCiAlpha(layer);
266 alpha = ( 2 * trk->GetdY() - (alpha >> fGtuParam->GetBitExcessAlpha()) + 1 ) >> 1;
267 trk->SetAlpha(alpha);
269 Int_t yproj = trk->GetdY() * (fGtuParam->GetCiYProj(layer)); //??? sign?
270 yproj = ( ( ( (yproj >> fGtuParam->GetBitExcessYProj()) + trk->GetYbin() ) >> 2) + 1) >> 1;
271 trk->SetYProj(yproj);
273 trk->SetYPrime(trk->GetYbin() + fGtuParam->GetYt(fStack, layer, trk->GetZbin()));
275 AliDebug(10, Form("0x%08x: idx: %3i, z: %2i, y: %5i, dy: %3i, y': %5i, y_proj: %5i, alpha: %3i, pid: %3i",
276 trk->GetTrackletWord(), trk->GetIndex(), trk->GetZbin(), trk->GetYbin(), trk->GetdY(), trk->GetYPrime(),
277 trk->GetYProj(), trk->GetAlpha(), trk->GetPID() ));
282 Bool_t AliTRDgtuTMU::RunZChannelUnit(Int_t layer)
284 // run the z-channel unit
286 TIter next(fTrackletsPostInput[layer]);
288 while (AliTRDtrackletGTU *trk = (AliTRDtrackletGTU*) next()) {
289 for (Int_t zch = 0; zch < fGtuParam->GetNZChannels(); zch++) {
290 if (fGtuParam->IsInZChannel(fStack, layer, zch, trk->GetZbin()) ) {
291 trk->SetSubChannel(zch, fGtuParam->GetZSubchannel(fStack, layer, zch, trk->GetZbin()) );
293 TIter nexttrkl(&fZChannelTracklets[layer][zch], kIterBackward);
294 AliTRDtrackletGTU *t = 0x0;
295 while ((t = (AliTRDtrackletGTU*) nexttrkl.Next())) {
296 if (t->GetSubChannel(zch) < trk->GetSubChannel(zch) ||
297 ((t->GetSubChannel(zch) == trk->GetSubChannel(zch)) && (t->GetYProj() < trk->GetYProj())) ) {
302 fZChannelTracklets[layer][zch].AddAfter(t, trk);
304 fZChannelTracklets[layer][zch].AddFirst(trk);
307 AliDebug(10, Form("stack %d, layer %2d: 0x%08x Z(2..0)=%i/%i/%i",
308 fStack, layer, trk->GetTrackletWord(),
309 fGtuParam->IsInZChannel(fStack, layer, 2, trk->GetZbin()) ? trk->GetSubChannel(2) : -1,
310 fGtuParam->IsInZChannel(fStack, layer, 1, trk->GetZbin()) ? trk->GetSubChannel(1) : -1,
311 fGtuParam->IsInZChannel(fStack, layer, 0, trk->GetZbin()) ? trk->GetSubChannel(0) : -1
317 Bool_t AliTRDgtuTMU::RunTrackFinder(Int_t zch, TList* /* ListOfTracks */)
319 // run the track finding
321 Int_t *notr = new Int_t[fGtuParam->GetNLayers()];
322 Int_t *ptrA = new Int_t[fGtuParam->GetNLayers()];
323 Int_t *ptrB = new Int_t[fGtuParam->GetNLayers()];
325 Bool_t *bHitA = new Bool_t[fGtuParam->GetNLayers()];
326 Bool_t *bHitB = new Bool_t[fGtuParam->GetNLayers()];
327 Bool_t *bAligned = new Bool_t[fGtuParam->GetNLayers()];
328 Bool_t *bAlignedA = new Bool_t[fGtuParam->GetNLayers()];
329 Bool_t *bAlignedB = new Bool_t[fGtuParam->GetNLayers()];
330 Bool_t *bDone = new Bool_t[fGtuParam->GetNLayers()];
333 Int_t *inc = new Int_t[fGtuParam->GetNLayers()];
334 Int_t *incprime = new Int_t[fGtuParam->GetNLayers()];
336 // ----- signals within current layer -----
347 AliTRDtrackletGTU *trkRA = 0x0; // reference tracklet A
348 AliTRDtrackletGTU *trkRB = 0x0; // reference tracklet B
349 AliTRDtrackletGTU *trkA = 0x0; // tracklet A in current layer
350 AliTRDtrackletGTU *trkB = 0x0; // tracklet B in current layer
352 AliTRDtrackletGTU *trkEnd = new AliTRDtrackletGTU();
353 for (Int_t i = 0; i < fGtuParam->GetNZChannels(); i++)
354 trkEnd->SetSubChannel(i, 7);
359 for (Int_t refLayerIdx = 0; refLayerIdx < fGtuParam->GetNRefLayers(); refLayerIdx++) {
360 Int_t reflayer = fGtuParam->GetRefLayer(refLayerIdx);
361 AliDebug(5,Form("Tracking for z-channel: %i, reflayer: %i", zch, reflayer));
363 ready = kFALSE; // ready if all channels done
365 // for (Int_t iLayer = 0; iLayer < fGtuParam->GetNLayers(); iLayer++) {
366 // for (Int_t iTrkl = 0; iTrkl < fZChannelTracklets[iLayer][zch].GetEntries(); iTrkl++) {
367 // printf("%4i/%4i(%i,%i) ",
368 // ((AliTRDtrackletGTU*) fZChannelTracklets[iLayer][zch].At(iTrkl))->GetYProj(),
369 // ((AliTRDtrackletGTU*) fZChannelTracklets[iLayer][zch].At(iTrkl))->GetAlpha(),
370 // ((AliTRDtrackletGTU*) fZChannelTracklets[iLayer][zch].At(iTrkl))->GetIndex(),
371 // ((AliTRDtrackletGTU*) fZChannelTracklets[iLayer][zch].At(iTrkl))->GetSubChannel(zch)
377 for (Int_t layer = 0; layer < fGtuParam->GetNLayers(); layer++) {
378 notr[layer] = fZChannelTracklets[layer][zch].GetEntries();
379 ptrA[layer] = 0; // notr[layer] > 0 ? 0 : -1;
380 ptrB[layer] = 1; // notr[layer] > 1 ? 1 : -1;
382 // not necessary here
383 // bDone[layer] = (ptrB[layer] >= notr[layer] - 1); // trkB is last one
384 // bDone[layer] = (notr[layer] <= 0);
385 // ready = ready && bDone[layer];
388 AliDebug(5,Form("in layer: %i (zchannel = %i) there are: %i tracklets", layer, zch, notr[layer]));
391 if (ptrA[reflayer] < 0 && ptrB[reflayer] < 0)
395 // ----- reference tracklets -----
398 if (0 <= ptrA[reflayer] && ptrA[reflayer] < notr[reflayer])
399 trkRA = (AliTRDtrackletGTU*) fZChannelTracklets[reflayer][zch].At(ptrA[reflayer]);
401 AliDebug(10,Form("No valid tracklet in the reference at ptr: %i! Nothing done!", ptrA[reflayer]));
405 if (0 <= ptrB[reflayer] && ptrB[reflayer] < notr[reflayer])
406 trkRB = (AliTRDtrackletGTU*) fZChannelTracklets[reflayer][zch].At(ptrB[reflayer]);
408 yPlus = trkRA->GetYProj() + fGtuParam->GetDeltaY();
409 yMinus = trkRA->GetYProj() - fGtuParam->GetDeltaY();
410 alphaPlus = trkRA->GetAlpha() + fGtuParam->GetDeltaAlpha();
411 alphaMinus = trkRA->GetAlpha() - fGtuParam->GetDeltaAlpha();
413 ybPlus = trkRB->GetYProj() + fGtuParam->GetDeltaY();
414 ybMinus = trkRB->GetYProj() - fGtuParam->GetDeltaY();
416 else { // irrelevant (should be, is it?)
417 ybPlus = trkRA->GetYProj() + fGtuParam->GetDeltaY();
418 ybMinus = trkRA->GetYProj() - fGtuParam->GetDeltaY();
425 for (Int_t layer = 0; layer < fGtuParam->GetNLayers(); layer++) {
426 bHitA[layer] = bHitB[layer] = bAligned[layer] = kFALSE;
427 inc[layer] = incprime[layer] = 0;
429 if (layer == reflayer) {
430 bHitA[layer] = kTRUE;
431 bAligned[layer] = kTRUE;
438 if (0 <= ptrA[layer] && ptrA[layer] < notr[layer])
439 trkA = (AliTRDtrackletGTU*) fZChannelTracklets[layer][zch].At(ptrA[layer]);
440 if (0 <= ptrB[layer] && ptrB[layer] < notr[layer])
441 trkB = (AliTRDtrackletGTU*) fZChannelTracklets[layer][zch].At(ptrB[layer]);
443 bAlignedA[layer] = kFALSE;
444 bAlignedB[layer] = kFALSE;
447 bHitA[layer] = ( !(trkA->GetSubChannel(zch) < trkRA->GetSubChannel(zch) || (trkA->GetSubChannel(zch) == trkRA->GetSubChannel(zch) && trkA->GetYProj() < yMinus) ) &&
448 !(trkA->GetSubChannel(zch) > trkRA->GetSubChannel(zch) || (trkA->GetSubChannel(zch) == trkRA->GetSubChannel(zch) && trkA->GetYProj() > yPlus) ) &&
449 !(trkA->GetAlpha() < alphaMinus) &&
450 !(trkA->GetAlpha() > alphaPlus) );
451 bAlignedA[layer] = !(trkA->GetSubChannel(zch) < trkRA->GetSubChannel(zch) || (trkA->GetSubChannel(zch) == trkRA->GetSubChannel(zch) && trkA->GetYProj() < yMinus) );
455 bAlignedA[layer] = kTRUE;
459 bHitB[layer] = ( !(trkB->GetSubChannel(zch) < trkRA->GetSubChannel(zch) || (trkB->GetSubChannel(zch) == trkRA->GetSubChannel(zch) && trkB->GetYProj() < yMinus) ) &&
460 !(trkB->GetSubChannel(zch) > trkRA->GetSubChannel(zch) || (trkB->GetSubChannel(zch) == trkRA->GetSubChannel(zch) && trkB->GetYProj() > yPlus) ) &&
461 !(trkB->GetAlpha() < alphaMinus) &&
462 !(trkB->GetAlpha() > alphaPlus) );
463 bAlignedB[layer] = (trkB->GetSubChannel(zch) > trkRA->GetSubChannel(zch) || (trkB->GetSubChannel(zch) == trkRA->GetSubChannel(zch) && trkB->GetYProj() > yPlus) );
467 bAlignedB[layer] = kTRUE;
470 bAligned[layer] = bAlignedA[layer] || bAlignedB[layer]; //???
471 // bAligned[layer] = bAlignedA[layer]; //???
473 if (bAligned[layer] && (bHitA[layer] || bHitB[layer]) )
475 else if (!bAligned[layer] )
479 if ((trkA->GetSubChannel(zch) > trkRB->GetSubChannel(zch)) || (trkA->GetSubChannel(zch) == trkRB->GetSubChannel(zch) && trkA->GetYProj() > ybPlus) )
486 // pre-calculation for the layer shifting (alignment w. r. t. trkRB)
489 if ((trkA->GetSubChannel(zch) < trkRB->GetSubChannel(zch)) || (trkA->GetSubChannel(zch) == trkRB->GetSubChannel(zch) && trkA->GetYProj() < ybMinus )) // could trkA be aligned for trkRB
499 if ((trkB->GetSubChannel(zch) < trkRB->GetSubChannel(zch)) || (trkB->GetSubChannel(zch) == trkRB->GetSubChannel(zch) && trkB->GetYProj() < ybMinus )) // could trkB be aligned for trkRB
506 } // end of loop over layers
508 AliDebug(5,Form("logic calculation finished, Nhits: %i %s",
509 nHits, (nHits >= 4) ? "-> track found" : ""));
512 // ----- track registration -----
513 AliTRDtrackGTU *track = new AliTRDtrackGTU();
514 track->SetSector(fSector);
515 track->SetStack(fStack);
516 for (Int_t layer = 0; layer < fGtuParam->GetNLayers(); layer++ ) {
517 if (bHitA[layer] || layer == reflayer)
518 track->AddTracklet((AliTRDtrackletGTU* ) fZChannelTracklets[layer][zch].At(ptrA[layer]), layer );
519 else if (bHitB[layer])
520 track->AddTracklet((AliTRDtrackletGTU* ) fZChannelTracklets[layer][zch].At(ptrB[layer]), layer );
523 Bool_t registerTrack = kTRUE;
524 for (Int_t layerIdx = refLayerIdx-1; layerIdx >= 0; layerIdx--) {
525 if (track->IsTrackletInLayer(fGtuParam->GetRefLayer(layerIdx))) {
526 if ((track->GetTracklet(fGtuParam->GetRefLayer(layerIdx)))->GetSubChannel(zch) > 0) {
527 AliDebug(1,"Not registered");
528 registerTrack = kFALSE;
533 track->SetZChannel(zch);
534 track->SetRefLayerIdx(refLayerIdx);
535 fTracks[zch][refLayerIdx].Add(track);
539 if ( (nUnc != 0) && (nUnc + nHits >= 4) ) // could this position of the reference layer give some track //??? special check in case of hit?
541 else if (nWayBeyond > 2) // no track possible for both reference tracklets
546 if (inc[reflayer] != 0) // reflayer is shifted
547 for (Int_t layer = 0; layer < fGtuParam->GetNLayers(); layer++) {
548 if (layer == reflayer)
550 inc[layer] = incprime[layer];
552 else { // reflayer is not shifted
553 for (Int_t layer = 0; layer < fGtuParam->GetNLayers(); layer++) {
554 if (layer == reflayer || notr[layer] == 0)
559 if (0 <= ptrA[layer] && ptrA[layer] < notr[layer])
560 trkA = (AliTRDtrackletGTU*) fZChannelTracklets[layer][zch].At(ptrA[layer]);
562 if (0 <= ptrB[layer] && ptrB[layer] < notr[layer])
563 trkB = (AliTRDtrackletGTU*) fZChannelTracklets[layer][zch].At(ptrB[layer]);
566 if ( !(trkA->GetSubChannel(zch) < trkRA->GetSubChannel(zch) || (trkA->GetSubChannel(zch) == trkRA->GetSubChannel(zch) && trkA->GetYProj() < yMinus) ) &&
567 !(trkA->GetSubChannel(zch) > trkRA->GetSubChannel(zch) || (trkA->GetSubChannel(zch) == trkRA->GetSubChannel(zch) && trkA->GetYProj() > yPlus ) ) ) // trkA could hit trkRA
568 // if ( !(trkA->GetSubChannel(zch) < trkRA->GetSubChannel(zch) || (trkA->GetSubChannel(zch) == trkRA->GetSubChannel(zch) && trkA->GetYProj() < yMinus) ) )
571 if ( trkB->GetSubChannel(zch) < trkRA->GetSubChannel(zch) || (trkB->GetSubChannel(zch) == trkRA->GetSubChannel(zch) && trkB->GetYProj() < yMinus) )
573 else if ( !(trkB->GetSubChannel(zch) > trkRA->GetSubChannel(zch) || (trkB->GetSubChannel(zch) == trkRA->GetSubChannel(zch) && trkB->GetYProj() > yPlus) ) )
576 inc[layer] = incprime[layer];
579 inc[layer] = incprime[layer];
585 for (Int_t layer = fGtuParam->GetNLayers()-1; layer >= 0; layer--) {
587 bDone[layer] = ptrB[layer] < 0 || ptrB[layer] >= notr[layer];
588 ready = ready && bDone[layer];
590 if (inc[layer] != 0 && ptrA[layer] >= notr[layer])
591 AliError(Form("Invalid increment: %i at ptrA: %i, notr: %i", inc[layer], ptrA[layer], notr[layer]));
593 // AliInfo(Form("Shifting layer: %i, notr: %i, ptrA: %i, ptrB: %i, inc: %i", layer, notr[layer], ptrA[layer], ptrB[layer], inc[layer]));
594 AliDebug(10,Form(" Layer: %i %2i(%2i, %2i, %4i, %3i)%s%s %2i(%2i, %2i, %4i, %3i)%s%s +%i %s (no: %i)",
597 (0 <= ptrA[layer] && ptrA[layer] < notr[layer]) ? ((AliTRDtrackletGTU*) fZChannelTracklets[layer][zch].At(ptrA[layer]))->GetIndex() : -1,
598 (0 <= ptrA[layer] && ptrA[layer] < notr[layer]) ? ((AliTRDtrackletGTU*) fZChannelTracklets[layer][zch].At(ptrA[layer]))->GetSubChannel(zch) : -1,
599 (0 <= ptrA[layer] && ptrA[layer] < notr[layer]) ? ((AliTRDtrackletGTU*) fZChannelTracklets[layer][zch].At(ptrA[layer]))->GetYProj() : -1,
600 (0 <= ptrA[layer] && ptrA[layer] < notr[layer]) ? ((AliTRDtrackletGTU*) fZChannelTracklets[layer][zch].At(ptrA[layer]))->GetAlpha() : -1,
601 bHitA[layer] ? "*" : " ", bAlignedA[layer] ? "+" : " ",
603 (0 <= ptrB[layer] && ptrB[layer] < notr[layer]) ? ((AliTRDtrackletGTU*) fZChannelTracklets[layer][zch].At(ptrB[layer]))->GetIndex() : -1,
604 (0 <= ptrB[layer] && ptrB[layer] < notr[layer]) ? ((AliTRDtrackletGTU*) fZChannelTracklets[layer][zch].At(ptrB[layer]))->GetSubChannel(zch) : -1,
605 (0 <= ptrB[layer] && ptrB[layer] < notr[layer]) ? ((AliTRDtrackletGTU*) fZChannelTracklets[layer][zch].At(ptrB[layer]))->GetYProj() : -1,
606 (0 <= ptrB[layer] && ptrB[layer] < notr[layer]) ? ((AliTRDtrackletGTU*) fZChannelTracklets[layer][zch].At(ptrB[layer]))->GetAlpha() : -1,
607 bHitB[layer] ? "*" : " ", bAlignedB[layer] ? "+" : " ",
608 inc[layer], bDone[layer] ? "done" : " ", notr[layer]));
609 ptrA[layer] += inc[layer];
610 ptrB[layer] += inc[layer];
614 } // end of loop over reflayer
631 Bool_t AliTRDgtuTMU::RunTrackMerging(TList* ListOfTracks)
633 TList **tracksRefMerged = new TList*[fGtuParam->GetNZChannels()];
634 TList **tracksRefUnique = new TList*[fGtuParam->GetNZChannels()];
636 for (Int_t zch = 0; zch < fGtuParam->GetNZChannels(); zch++) {
637 tracksRefMerged[zch] = new TList;
638 tracksRefUnique[zch] = new TList;
641 TList *tracksZMergedStage0 = new TList;
642 TList *tracksZUniqueStage0 = new TList;
644 TList **tracksZSplitted = new TList*[2];
645 for (Int_t i = 0; i < 2; i++)
646 tracksZSplitted[i] = new TList;
648 TList *tracksZMergedStage1 = new TList;
650 AliTRDtrackGTU **trkInRefLayer = new AliTRDtrackGTU*[fGtuParam->GetNRefLayers()];
652 Bool_t done = kFALSE;
654 AliTRDtrackGTU *trkStage0 = 0x0;
656 for (Int_t zch = 0; zch < fGtuParam->GetNZChannels(); zch++) {
657 // ----- Merging and Unification in Reflayers (seed_merger) -----
661 for (Int_t refLayerIdx = 0; refLayerIdx < fGtuParam->GetNRefLayers(); refLayerIdx++) {
662 trkInRefLayer[refLayerIdx] = (AliTRDtrackGTU*) fTracks[zch][refLayerIdx].First();
663 if (trkInRefLayer[refLayerIdx] == 0) {
666 else if (trkStage0 == 0x0 ) {
667 trkStage0 = trkInRefLayer[refLayerIdx];
668 minIdx = refLayerIdx;
671 else if (trkInRefLayer[refLayerIdx]->GetZSubChannel() < trkStage0->GetZSubChannel() ||
672 (trkInRefLayer[refLayerIdx]->GetZSubChannel() == trkStage0->GetZSubChannel() && trkInRefLayer[refLayerIdx]->GetYapprox() < trkStage0->GetYapprox()) ) {
673 minIdx = refLayerIdx;
674 trkStage0 = trkInRefLayer[refLayerIdx];
680 tracksRefMerged[zch]->Add(trkStage0);
681 fTracks[zch][minIdx].RemoveFirst();
682 } while (trkStage0 != 0);
684 Uniquifier(tracksRefMerged[zch], tracksRefUnique[zch]);
686 AliDebug(2, Form("zchannel %i", zch));
687 TIter trackRefMerged(tracksRefMerged[zch]);
688 while (AliTRDtrackGTU *trk = (AliTRDtrackGTU*) trackRefMerged())
689 AliDebug(2, Form("track ref layer %i : %i %i %i %i %i %i, y=%i, z_idx=%i",
690 AliTRDgtuParam::GetRefLayer(trk->GetRefLayerIdx()),
691 trk->GetTrackletIndex(5),
692 trk->GetTrackletIndex(4),
693 trk->GetTrackletIndex(3),
694 trk->GetTrackletIndex(2),
695 trk->GetTrackletIndex(1),
696 trk->GetTrackletIndex(0),
697 trk->GetYapprox() >> 3,
698 trk->GetZSubChannel()));
699 AliDebug(2, "uniquified:");
700 TIter trackRefUnique(tracksRefUnique[zch]);
701 while (AliTRDtrackGTU *trk = (AliTRDtrackGTU*) trackRefUnique())
702 AliDebug(2, Form("track ref layer %i : %i %i %i %i %i %i, y=%i, z_idx=%i",
703 AliTRDgtuParam::GetRefLayer(trk->GetRefLayerIdx()),
704 trk->GetTrackletIndex(5),
705 trk->GetTrackletIndex(4),
706 trk->GetTrackletIndex(3),
707 trk->GetTrackletIndex(2),
708 trk->GetTrackletIndex(1),
709 trk->GetTrackletIndex(0),
710 trk->GetYapprox() >> 3,
711 trk->GetZSubChannel()));
714 // ----- Merging in zchannels - 1st stage -----
719 for (Int_t zch = 0; zch < fGtuParam->GetNZChannels(); zch++) {
720 AliTRDtrackGTU *trk = (AliTRDtrackGTU*) tracksRefUnique[zch]->First();
724 else if (trkStage0 == 0x0 ) {
729 else if ( ((trk->GetZChannel() + 3 * trk->GetZSubChannel()) / 2 - 1) < ((trkStage0->GetZChannel() + 3 * trkStage0->GetZSubChannel()) / 2 -1 ) ||
730 (((trk->GetZChannel() + 3 * trk->GetZSubChannel()) / 2 - 1) == ((trkStage0->GetZChannel() + 3 * trkStage0->GetZSubChannel()) / 2 -1 ) && (trk->GetYapprox() < trkStage0->GetYapprox()) ) ) {
739 tracksZMergedStage0->Add(trkStage0);
740 tracksRefUnique[minIdx]->RemoveFirst();
741 } while (trkStage0 != 0);
743 Uniquifier(tracksZMergedStage0, tracksZUniqueStage0);
745 AliDebug(2, "stage 0:");
746 TIter trackZMergedStage0(tracksZMergedStage0);
747 while (AliTRDtrackGTU *trk = (AliTRDtrackGTU*) trackZMergedStage0())
748 AliDebug(2, Form("track ref layer %i : %i %i %i %i %i %i, y=%i, zch=%i idx=%i",
749 AliTRDgtuParam::GetRefLayer(trk->GetRefLayerIdx()),
750 trk->GetTrackletIndex(5),
751 trk->GetTrackletIndex(4),
752 trk->GetTrackletIndex(3),
753 trk->GetTrackletIndex(2),
754 trk->GetTrackletIndex(1),
755 trk->GetTrackletIndex(0),
756 trk->GetYapprox() >> 3,
758 trk->GetZSubChannel()));
760 AliDebug(2, "uniquified:");
761 TIter trackZUniqueStage0(tracksZUniqueStage0);
762 while (AliTRDtrackGTU *trk = (AliTRDtrackGTU*) trackZUniqueStage0())
763 AliDebug(2, Form("track ref layer %i : %i %i %i %i %i %i, y=%i, zch=%i idx=%i",
764 AliTRDgtuParam::GetRefLayer(trk->GetRefLayerIdx()),
765 trk->GetTrackletIndex(5),
766 trk->GetTrackletIndex(4),
767 trk->GetTrackletIndex(3),
768 trk->GetTrackletIndex(2),
769 trk->GetTrackletIndex(1),
770 trk->GetTrackletIndex(0),
771 trk->GetYapprox() >> 3,
773 trk->GetZSubChannel()));
775 // ----- Splitting in z -----
777 TIter next(tracksZUniqueStage0);
778 while (AliTRDtrackGTU *trk = (AliTRDtrackGTU*) next()) {
779 tracksZSplitted[(trk->GetZChannel() + 3 * (trk->GetZSubChannel() - 1)) % 2]->Add(trk);
782 for (Int_t i = 0; i < 2; i++) {
783 AliDebug(2, Form("split %i:", i));
784 TIter trackZSplit(tracksZSplitted[i]);
785 while (AliTRDtrackGTU *trk = (AliTRDtrackGTU*) trackZSplit())
786 AliDebug(2, Form("track ref layer %i : %i %i %i %i %i %i, y=%i, zch=%i idx=%i",
787 AliTRDgtuParam::GetRefLayer(trk->GetRefLayerIdx()),
788 trk->GetTrackletIndex(5),
789 trk->GetTrackletIndex(4),
790 trk->GetTrackletIndex(3),
791 trk->GetTrackletIndex(2),
792 trk->GetTrackletIndex(1),
793 trk->GetTrackletIndex(0),
794 trk->GetYapprox() >> 3,
796 trk->GetZSubChannel()));
799 // ----- Merging in zchanels - 2nd stage -----
804 for (Int_t i = 1; i >= 0; i--) {
805 AliTRDtrackGTU *trk = (AliTRDtrackGTU*) tracksZSplitted[i]->First();
809 else if (trkStage0 == 0x0 ) {
814 else if ( (((trk->GetZChannel() + 3 * (trk->GetZSubChannel() - 1)) / 2) < ((trkStage0->GetZChannel() + 3 * (trkStage0->GetZSubChannel() - 1)) / 2)) ||
815 ((((trk->GetZChannel() + 3 * (trk->GetZSubChannel() - 1)) / 2) == ((trkStage0->GetZChannel() + 3 * (trkStage0->GetZSubChannel() - 1)) / 2)) && (trk->GetYapprox() < trkStage0->GetYapprox()) ) ) {
824 tracksZMergedStage1->Add(trkStage0);
825 tracksZSplitted[minIdx]->RemoveFirst();
826 } while (trkStage0 != 0);
828 Uniquifier(tracksZMergedStage1, ListOfTracks);
830 AliDebug(2, "merged:");
831 TIter trackZMergedStage1(tracksZMergedStage1);
832 while (AliTRDtrackGTU *trk = (AliTRDtrackGTU*) trackZMergedStage1())
833 AliDebug(2, Form("track ref layer %i : %i %i %i %i %i %i, y=%i, zch=%i idx=%i",
834 AliTRDgtuParam::GetRefLayer(trk->GetRefLayerIdx()),
835 trk->GetTrackletIndex(5),
836 trk->GetTrackletIndex(4),
837 trk->GetTrackletIndex(3),
838 trk->GetTrackletIndex(2),
839 trk->GetTrackletIndex(1),
840 trk->GetTrackletIndex(0),
841 trk->GetYapprox() >> 3,
843 trk->GetZSubChannel()));
845 AliDebug(2, "uniquified:");
846 TIter track(ListOfTracks);
847 while (AliTRDtrackGTU *trk = (AliTRDtrackGTU*) track())
848 AliDebug(2, Form("track ref layer %i : %i %i %i %i %i %i, y=%i, zch=%i idx=%i",
849 AliTRDgtuParam::GetRefLayer(trk->GetRefLayerIdx()),
850 trk->GetTrackletIndex(5),
851 trk->GetTrackletIndex(4),
852 trk->GetTrackletIndex(3),
853 trk->GetTrackletIndex(2),
854 trk->GetTrackletIndex(1),
855 trk->GetTrackletIndex(0),
856 trk->GetYapprox() >> 3,
858 trk->GetZSubChannel()));
861 for (Int_t zch = 0; zch < fGtuParam->GetNZChannels(); zch++) {
862 delete tracksRefMerged[zch];
863 delete tracksRefUnique[zch];
865 delete [] tracksRefMerged;
866 delete [] tracksRefUnique;
869 delete tracksZMergedStage0;
870 delete tracksZUniqueStage0;
872 for (Int_t i = 0; i < 2; i++)
873 delete tracksZSplitted[i];
874 delete [] tracksZSplitted;
876 delete tracksZMergedStage1;
878 delete [] trkInRefLayer;
883 Bool_t AliTRDgtuTMU::RunTrackReconstruction(TList* ListOfTracks)
885 // run the track reconstruction for all tracks in the list
887 TIter next(ListOfTracks);
888 while (AliTRDtrackGTU *track = (AliTRDtrackGTU*) next()) {
889 CalculateTrackParams(track);
891 AliDebug(1, Form("track with pid = %i", track->GetPID()));
896 Bool_t AliTRDgtuTMU::CalculatePID(AliTRDtrackGTU *track)
898 // calculate PID for the given track
900 AliError("No track to calculate!");
904 if (AliTRDgtuParam::GetUseGTUconst()) {
905 // averaging as in GTU
908 // selection of coefficient for averaging
909 switch(track->GetTrackletMask()){
912 coeff=0x5558; // approx. 1/6
922 coeff=0x6666; // approx. 1/5
927 coeff=0x8000; // = 0.25
929 coeff &= 0x1ffff; // 17-bit constant
932 for (Int_t iLayer = 0; iLayer < fGtuParam->GetNLayers(); iLayer++) {
933 if ((track->GetTrackletMask() >> iLayer) & 1) {
934 sum += track->GetTracklet(iLayer)->GetPID();
938 ULong64_t sumExt = (sum << 1) & 0xfff; // 11 bit -> 12 bit vector
939 ULong64_t prod = (sumExt * coeff) & 0xfffffffffull; // 18x18 signed -> 36
940 ULong64_t prodFinal = ((prod >> 18) + ((prod >> 17) & 1)) & 0xff; // rounding term is equivalent to adding 5 to sum_ext
942 track->SetPID(prodFinal & 0xff);
949 Int_t nTracklets = 0;
951 for (Int_t layer = 0; layer < fGtuParam->GetNLayers(); layer++) {
952 if (!track->IsTrackletInLayer(layer)) {
955 AliTRDtrackletGTU *trk = track->GetTracklet(layer);
956 pidSum += trk->GetPID();
959 track->SetPID(pidSum/nTracklets);
965 Bool_t AliTRDgtuTMU::CalculateTrackParams(AliTRDtrackGTU *track)
967 // calculate the track parameters
970 AliError("No track to calculate!");
980 AliDebug(5,Form("There are %i tracklets in this track.", track->GetNTracklets()));
982 for (Int_t layer = 0; layer < fGtuParam->GetNLayers(); layer++) {
983 if (!track->IsTrackletInLayer(layer)) {
986 AliTRDtrackletGTU *trk = track->GetTracklet(layer);
988 AliError(Form("Could not get tracklet in layer %i\n", layer));
991 AliDebug(10,Form(" trk yprime: %6i, aki: %6i", trk->GetYPrime(), (Int_t) (2048 * fGtuParam->GetAki(track->GetTrackletMask(), layer))));
992 a += (((Int_t) (2048 * fGtuParam->GetAki(track->GetTrackletMask(), layer))) * trk->GetYPrime() + 1) >> 8;
993 b += fGtuParam->GetBki(track->GetTrackletMask(), layer) * trk->GetYPrime() * fGtuParam->GetBinWidthY();
994 c += fGtuParam->GetCki(track->GetTrackletMask(), layer) * trk->GetYPrime() * fGtuParam->GetBinWidthY();
1000 track->SetFitParams(a, b, c);
1002 fGtuParam->GetIntersectionPoints(track->GetTrackletMask(), x1, x2);
1004 AliDebug(5,Form(" Track parameters: a = %i, b = %f, c = %f, x1 = %f, x2 = %f, pt = %f (trkl mask: %i)", a, b, c, x1, x2, track->GetPt(), track->GetTrackletMask()));
1009 Bool_t AliTRDgtuTMU::WriteTrackletsToTree(TTree *trklTree)
1012 AliError("No tree given");
1015 AliTRDtrackletGTU *trkl = 0x0;
1016 TBranch *branch = trklTree->GetBranch("gtutracklets");
1018 branch = trklTree->Branch("gtutracklets", "AliTRDtrackletGTU", &trkl, 32000, 99);
1021 AliDebug(5,Form("---------- Writing tracklets to tree (not yet) ----------"));
1022 for (Int_t layer = 0; layer < fGtuParam->GetNLayers(); layer++) {
1023 TIter next(fTrackletsPostInput[layer]);
1024 while ((trkl = (AliTRDtrackletGTU*) next())) {
1025 AliDebug(10,Form("InputUnit : GetIndex(): %3i, GetZbin(): %2i, GetY() : %5i, GetdY() : %3i, GetYPrime() : %5i, GetYProj() : %5i, GetAlpha() : %3i, Zidx(2..0): %i %i %i", trkl->GetIndex(), trkl->GetZbin(), trkl->GetYbin(), trkl->GetdY(), trkl->GetYPrime(), trkl->GetYProj(), trkl->GetAlpha(), trkl->GetSubChannel(2), trkl->GetSubChannel(1), trkl->GetSubChannel(0) ));
1026 branch->SetAddress(&trkl);
1033 Bool_t AliTRDgtuTMU::Uniquifier(TList *inlist, TList *outlist)
1035 // remove multiple occurences of the same track
1038 AliTRDtrackGTU *trkStage0 = 0x0;
1039 AliTRDtrackGTU *trkStage1 = 0x0;
1042 trkStage0 = (AliTRDtrackGTU*) next();
1044 Bool_t tracksEqual = kFALSE;
1045 if (trkStage0 != 0 && trkStage1 != 0) {
1046 for (Int_t layer = 0; layer < fGtuParam->GetNLayers(); layer++) {
1047 if (trkStage0->GetTrackletIndex(layer) != -1 && trkStage0->GetTrackletIndex(layer) == trkStage1->GetTrackletIndex(layer)) {
1048 tracksEqual = kTRUE;
1055 if (trkStage0->GetNTracklets() >= trkStage1->GetNTracklets())
1056 trkStage1 = trkStage0;
1059 if (trkStage1 != 0x0)
1060 outlist->Add(trkStage1);
1061 trkStage1 = trkStage0;
1064 } while (trkStage1 != 0x0);