Major rewriting using VStores, and trying to implement all methods required by the...
[u/mrichter/AliRoot.git] / MUON / AliMUONResponseV0.cxx
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a9e2aefa 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
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 **************************************************************************/
15
88cb7938 16/* $Id$ */
a9e2aefa 17
d19b6003 18// --------------------------
19// Class AliMUONResponseV0
20// --------------------------
9265505b 21// Implementation of
22// Mathieson response
a9e2aefa 23
30178c30 24#include "AliMUONResponseV0.h"
885d501b 25#include "AliMUON.h"
26#include "AliMUONConstants.h"
27#include "AliMUONDigit.h"
28#include "AliMUONGeometrySegmentation.h"
29#include "AliMUONGeometryTransformer.h"
30#include "AliMUONHit.h"
31#include "AliMUONSegmentation.h"
9265505b 32
885d501b 33#include "AliMpArea.h"
34#include "AliMpDEManager.h"
885d501b 35#include "AliMpVPadIterator.h"
9265505b 36#include "AliMpSegmentation.h"
885d501b 37#include "AliMpVSegmentation.h"
866c3232 38#include "AliMpCathodType.h"
9265505b 39
885d501b 40#include "AliRun.h"
9265505b 41#include "AliLog.h"
42
885d501b 43#include "Riostream.h"
44#include "TVector2.h"
45#include <TMath.h>
46#include <TRandom.h>
8c343c7c 47
9265505b 48/// \cond CLASSIMP
d5bfadcc 49ClassImp(AliMUONResponseV0)
9265505b 50/// \endcond
d5bfadcc 51
885d501b 52AliMUON* muon()
53{
54 return static_cast<AliMUON*>(gAlice->GetModule("MUON"));
55}
56
57void Global2Local(Int_t detElemId, Double_t xg, Double_t yg, Double_t zg,
58 Double_t& xl, Double_t& yl, Double_t& zl)
59{
9265505b 60 /// ideally should be :
61 /// Double_t x,y,z;
62 /// AliMUONGeometry::Global2Local(detElemId,xg,yg,zg,x,y,z);
63 /// but while waiting for this geometry singleton, let's go through
64 /// AliMUON still.
885d501b 65
66 const AliMUONGeometryTransformer* transformer = muon()->GetGeometryTransformer();
67 transformer->Global2Local(detElemId,xg,yg,zg,xl,yl,zl);
68}
69
70AliMUONSegmentation* Segmentation()
71{
72 static AliMUONSegmentation* segmentation = muon()->GetSegmentation();
73 return segmentation;
74}
75
30178c30 76//__________________________________________________________________________
77AliMUONResponseV0::AliMUONResponseV0()
885d501b 78 : AliMUONResponse(),
79 fChargeSlope(0.0),
80 fChargeSpreadX(0.0),
81 fChargeSpreadY(0.0),
82 fSigmaIntegration(0.0),
83 fMaxAdc(0),
ccea41d4 84 fSaturation(0),
885d501b 85 fZeroSuppression(0),
86 fChargeCorrel(0.0),
87 fMathieson(new AliMUONMathieson),
88 fChargeThreshold(1e-4)
30178c30 89{
9265505b 90 /// Normal constructor
885d501b 91 AliDebug(1,Form("Default ctor"));
30178c30 92}
f29ba3e1 93
ccea41d4 94//__________________________________________________________________________
a713db22 95AliMUONResponseV0::~AliMUONResponseV0()
96{
9265505b 97/// Destructor
98
885d501b 99 AliDebug(1,"");
a713db22 100 delete fMathieson;
101}
f29ba3e1 102
885d501b 103//______________________________________________________________________________
104void
105AliMUONResponseV0::Print(Option_t*) const
106{
9265505b 107/// Printing
d19b6003 108
885d501b 109 cout << " ChargeSlope=" << fChargeSlope
110 << " ChargeSpreadX,Y=" << fChargeSpreadX
111 << fChargeSpreadY
112 << " ChargeCorrelation=" << fChargeCorrel
113 << endl;
885d501b 114}
115
d5bfadcc 116 //__________________________________________________________________________
117void AliMUONResponseV0::SetSqrtKx3AndDeriveKx2Kx4(Float_t SqrtKx3)
118{
9265505b 119 /// Set to "SqrtKx3" the Mathieson parameter K3 ("fSqrtKx3")
120 /// in the X direction, perpendicular to the wires,
121 /// and derive the Mathieson parameters K2 ("fKx2") and K4 ("fKx4")
122 /// in the same direction
a713db22 123 fMathieson->SetSqrtKx3AndDeriveKx2Kx4(SqrtKx3);
d5bfadcc 124}
125
126 //__________________________________________________________________________
127void AliMUONResponseV0::SetSqrtKy3AndDeriveKy2Ky4(Float_t SqrtKy3)
128{
9265505b 129 /// Set to "SqrtKy3" the Mathieson parameter K3 ("fSqrtKy3")
130 /// in the Y direction, along the wires,
131 /// and derive the Mathieson parameters K2 ("fKy2") and K4 ("fKy4")
132 /// in the same direction
a713db22 133 fMathieson->SetSqrtKy3AndDeriveKy2Ky4(SqrtKy3);
d5bfadcc 134}
a713db22 135 //__________________________________________________________________________
85fec35d 136Float_t AliMUONResponseV0::IntPH(Float_t eloss) const
a9e2aefa 137{
9265505b 138 /// Calculate charge from given ionization energy loss
a9e2aefa 139 Int_t nel;
4ac9d21e 140 nel= Int_t(eloss*1.e9/27.4);
a9e2aefa 141 Float_t charge=0;
142 if (nel == 0) nel=1;
143 for (Int_t i=1;i<=nel;i++) {
01997fa2 144 Float_t arg=0.;
145 while(!arg) arg = gRandom->Rndm();
146 charge -= fChargeSlope*TMath::Log(arg);
a9e2aefa 147 }
148 return charge;
149}
a713db22 150
a713db22 151 //-------------------------------------------
85fec35d 152Float_t AliMUONResponseV0::IntXY(Int_t idDE,
153 AliMUONGeometrySegmentation* segmentation)
154const
a713db22 155{
9265505b 156 /// Calculate charge on current pad according to Mathieson distribution
a9e2aefa 157
a713db22 158 return fMathieson->IntXY(idDE, segmentation);
159}
885d501b 160
161
885d501b 162//_____________________________________________________________________________
163Float_t
164AliMUONResponseV0::GetAnod(Float_t x) const
165{
9265505b 166 /// Return wire coordinate closest to x.
167
885d501b 168 Int_t n = Int_t(x/Pitch());
169 Float_t wire = (x>0) ? n+0.5 : n-0.5;
170 return Pitch()*wire;
171}
a9e2aefa 172
885d501b 173//______________________________________________________________________________
174void
175AliMUONResponseV0::DisIntegrate(const AliMUONHit& hit, TList& digits)
176{
9265505b 177 /// Go from 1 hit to a list of digits.
178 /// The energy deposition of that hit is first converted into charge
179 /// (in IntPH() method), and then this charge is dispatched on several
180 /// pads, according to the Mathieson distribution.
885d501b 181
182 digits.Clear();
183
184 Int_t detElemId = hit.DetElemId();
185
885d501b 186 // Width of the integration area
885d501b 187 Double_t dx = SigmaIntegration()*ChargeSpreadX();
188 Double_t dy = SigmaIntegration()*ChargeSpreadY();
189
190 // Use that (dx,dy) to specify the area upon which
191 // we will iterate to spread charge into.
192 Double_t x,y,z;
193 Global2Local(detElemId,hit.X(),hit.Y(),hit.Z(),x,y,z);
194 x = GetAnod(x);
195 TVector2 hitPosition(x,y);
196 AliMpArea area(hitPosition,TVector2(dx,dy));
197
32c9ead9 198 // Get pulse height from energy loss.
885d501b 199 Float_t qtot = IntPH(hit.Eloss());
200
32c9ead9 201 // Get the charge correlation between cathodes.
885d501b 202 Float_t currentCorrel = TMath::Exp(gRandom->Gaus(0.0,ChargeCorrel()/2.0));
a9e2aefa 203
866c3232 204 for ( Int_t cath = AliMp::kCath0; cath <= AliMp::kCath1; ++cath )
885d501b 205 {
206 Float_t qcath = qtot * ( cath == 0 ? currentCorrel : 1.0/currentCorrel);
207
885d501b 208 // Get an iterator to loop over pads, within the given area.
32c9ead9 209 const AliMpVSegmentation* seg =
866c3232 210 AliMpSegmentation::Instance()
211 ->GetMpSegmentation(detElemId,AliMp::GetCathodType(cath));
885d501b 212
32c9ead9 213 AliMpVPadIterator* it = seg->CreateIterator(area);
214
215 if (!it)
216 {
217 AliError(Form("Could not get iterator for detElemId %d",detElemId));
218 return;
219 }
220
221 // Start loop over pads.
222 it->First();
223
224 if ( it->IsDone() )
225 {
226 // Exceptional case : iterator is built, but is invalid from the start.
227 AliMpPad pad = seg->PadByPosition(area.Position(),kFALSE);
228 if ( pad.IsValid() )
885d501b 229 {
32c9ead9 230 AliWarning(Form("Got an invalid iterator bug (area.Position() is within "
231 " DE but the iterator is void) for detElemId %d cath %d",
232 detElemId,cath));
885d501b 233 }
32c9ead9 234 else
885d501b 235 {
32c9ead9 236 AliError(Form("Got an invalid iterator bug for detElemId %d cath %d."
237 "Might be a bad hit ? area.Position()=(%e,%e) "
238 "Dimensions()=(%e,%e)",
239 detElemId,cath,area.Position().X(),area.Position().Y(),
240 area.Dimensions().X(),area.Dimensions().Y()));
885d501b 241 }
242 delete it;
32c9ead9 243 return;
244 }
245
246 while ( !it->IsDone() )
247 {
248 // For each pad given by the iterator, compute the charge of that
249 // pad, according to the Mathieson distribution.
250 AliMpPad pad = it->CurrentItem();
251 TVector2 lowerLeft(hitPosition-pad.Position()-pad.Dimensions());
252 TVector2 upperRight(lowerLeft + pad.Dimensions()*2.0);
253 Float_t qp = TMath::Abs(fMathieson->IntXY(lowerLeft.X(),lowerLeft.Y(),
254 upperRight.X(),upperRight.Y()));
255
256 Int_t icharge = Int_t(qp*qcath);
257
258 if ( qp > fChargeThreshold )
259 {
260 // If we're above threshold, then we create a digit,
261 // and fill it with relevant information, including electronics.
262 AliMUONDigit* d = new AliMUONDigit;
263 d->SetDetElemId(detElemId);
264 d->SetPadX(pad.GetIndices().GetFirst());
265 d->SetPadY(pad.GetIndices().GetSecond());
266 d->SetSignal(icharge);
267 d->AddPhysicsSignal(d->Signal());
268 d->SetCathode(cath);
269 d->SetElectronics(pad.GetLocation().GetFirst(),
270 pad.GetLocation().GetSecond());
271 digits.Add(d);
272 }
273 it->Next();
274 }
275 delete it;
885d501b 276 }
277}
a9e2aefa 278
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280