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