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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 | // -------------------------- | |
21 | // Implementation of Mathieson response | |
22 | // ... | |
a9e2aefa | 23 | |
30178c30 | 24 | #include "AliMUONResponseV0.h" |
885d501b | 25 | |
f29ba3e1 | 26 | #include "AliLog.h" |
885d501b | 27 | #include "AliMUON.h" |
28 | #include "AliMUONConstants.h" | |
29 | #include "AliMUONDigit.h" | |
30 | #include "AliMUONGeometrySegmentation.h" | |
31 | #include "AliMUONGeometryTransformer.h" | |
32 | #include "AliMUONHit.h" | |
33 | #include "AliMUONSegmentation.h" | |
34 | #include "AliMpArea.h" | |
35 | #include "AliMpDEManager.h" | |
885d501b | 36 | #include "AliMpVPadIterator.h" |
37 | #include "AliMpVSegmentation.h" | |
38 | #include "AliRun.h" | |
39 | #include "Riostream.h" | |
40 | #include "TVector2.h" | |
41 | #include <TMath.h> | |
42 | #include <TRandom.h> | |
8c343c7c | 43 | |
d5bfadcc | 44 | ClassImp(AliMUONResponseV0) |
45 | ||
885d501b | 46 | AliMUON* muon() |
47 | { | |
48 | return static_cast<AliMUON*>(gAlice->GetModule("MUON")); | |
49 | } | |
50 | ||
51 | void Global2Local(Int_t detElemId, Double_t xg, Double_t yg, Double_t zg, | |
52 | Double_t& xl, Double_t& yl, Double_t& zl) | |
53 | { | |
54 | // ideally should be : | |
55 | // Double_t x,y,z; | |
56 | // AliMUONGeometry::Global2Local(detElemId,xg,yg,zg,x,y,z); | |
57 | // but while waiting for this geometry singleton, let's go through | |
58 | // AliMUON still. | |
59 | ||
60 | const AliMUONGeometryTransformer* transformer = muon()->GetGeometryTransformer(); | |
61 | transformer->Global2Local(detElemId,xg,yg,zg,xl,yl,zl); | |
62 | } | |
63 | ||
64 | AliMUONSegmentation* Segmentation() | |
65 | { | |
66 | static AliMUONSegmentation* segmentation = muon()->GetSegmentation(); | |
67 | return segmentation; | |
68 | } | |
69 | ||
30178c30 | 70 | //__________________________________________________________________________ |
71 | AliMUONResponseV0::AliMUONResponseV0() | |
885d501b | 72 | : AliMUONResponse(), |
73 | fChargeSlope(0.0), | |
74 | fChargeSpreadX(0.0), | |
75 | fChargeSpreadY(0.0), | |
76 | fSigmaIntegration(0.0), | |
77 | fMaxAdc(0), | |
78 | fZeroSuppression(0), | |
79 | fChargeCorrel(0.0), | |
80 | fMathieson(new AliMUONMathieson), | |
81 | fChargeThreshold(1e-4) | |
30178c30 | 82 | { |
885d501b | 83 | // Normal constructor |
84 | AliDebug(1,Form("Default ctor")); | |
30178c30 | 85 | } |
f29ba3e1 | 86 | |
87 | //_________________________________________________________________________ | |
88 | AliMUONResponseV0::AliMUONResponseV0(const AliMUONResponseV0& rhs) | |
89 | : AliMUONResponse(rhs) | |
90 | { | |
91 | // Protected copy constructor | |
92 | ||
93 | AliFatal("Not implemented."); | |
94 | } | |
95 | ||
a713db22 | 96 | //__________________________________________________________________________ |
97 | AliMUONResponseV0::~AliMUONResponseV0() | |
98 | { | |
885d501b | 99 | AliDebug(1,""); |
a713db22 | 100 | delete fMathieson; |
101 | } | |
f29ba3e1 | 102 | |
103 | //________________________________________________________________________ | |
104 | AliMUONResponseV0& AliMUONResponseV0::operator = (const AliMUONResponseV0& rhs) | |
105 | { | |
106 | // Protected assignement operator | |
107 | ||
108 | if (this == &rhs) return *this; | |
109 | ||
110 | AliFatal("Not implemented."); | |
111 | ||
112 | return *this; | |
885d501b | 113 | } |
114 | ||
115 | //______________________________________________________________________________ | |
116 | void | |
117 | AliMUONResponseV0::Print(Option_t*) const | |
118 | { | |
d19b6003 | 119 | // Printing |
120 | ||
885d501b | 121 | cout << " ChargeSlope=" << fChargeSlope |
122 | << " ChargeSpreadX,Y=" << fChargeSpreadX | |
123 | << fChargeSpreadY | |
124 | << " ChargeCorrelation=" << fChargeCorrel | |
125 | << endl; | |
126 | ||
127 | //Float_t fChargeSlope; // Slope of the charge distribution | |
128 | //Float_t fChargeSpreadX; // Width of the charge distribution in x | |
129 | //Float_t fChargeSpreadY; // Width of the charge distribution in y | |
130 | //Float_t fSigmaIntegration; // Number of sigma's used for charge distribution | |
131 | //Int_t fMaxAdc; // Maximum ADC channel | |
132 | //Int_t fSaturation; // Pad saturation in ADC channel | |
133 | //Int_t fZeroSuppression; // Zero suppression threshold | |
134 | //Float_t fChargeCorrel; // amplitude of charge correlation on 2 cathods | |
135 | // // is RMS of ln(q1/q2) | |
136 | //AliMUONMathieson* fMathieson; // pointer to mathieson fct | |
137 | //Float_t fChargeThreshold; // Charges below this threshold are = 0 | |
138 | // | |
139 | ||
f29ba3e1 | 140 | } |
141 | ||
d5bfadcc | 142 | //__________________________________________________________________________ |
143 | void AliMUONResponseV0::SetSqrtKx3AndDeriveKx2Kx4(Float_t SqrtKx3) | |
144 | { | |
145 | // Set to "SqrtKx3" the Mathieson parameter K3 ("fSqrtKx3") | |
146 | // in the X direction, perpendicular to the wires, | |
147 | // and derive the Mathieson parameters K2 ("fKx2") and K4 ("fKx4") | |
148 | // in the same direction | |
a713db22 | 149 | fMathieson->SetSqrtKx3AndDeriveKx2Kx4(SqrtKx3); |
d5bfadcc | 150 | } |
151 | ||
152 | //__________________________________________________________________________ | |
153 | void AliMUONResponseV0::SetSqrtKy3AndDeriveKy2Ky4(Float_t SqrtKy3) | |
154 | { | |
155 | // Set to "SqrtKy3" the Mathieson parameter K3 ("fSqrtKy3") | |
156 | // in the Y direction, along the wires, | |
157 | // and derive the Mathieson parameters K2 ("fKy2") and K4 ("fKy4") | |
158 | // in the same direction | |
a713db22 | 159 | fMathieson->SetSqrtKy3AndDeriveKy2Ky4(SqrtKy3); |
d5bfadcc | 160 | } |
a713db22 | 161 | //__________________________________________________________________________ |
85fec35d | 162 | Float_t AliMUONResponseV0::IntPH(Float_t eloss) const |
a9e2aefa | 163 | { |
164 | // Calculate charge from given ionization energy loss | |
165 | Int_t nel; | |
4ac9d21e | 166 | nel= Int_t(eloss*1.e9/27.4); |
a9e2aefa | 167 | Float_t charge=0; |
168 | if (nel == 0) nel=1; | |
169 | for (Int_t i=1;i<=nel;i++) { | |
01997fa2 | 170 | Float_t arg=0.; |
171 | while(!arg) arg = gRandom->Rndm(); | |
172 | charge -= fChargeSlope*TMath::Log(arg); | |
a9e2aefa | 173 | } |
174 | return charge; | |
175 | } | |
a713db22 | 176 | |
a713db22 | 177 | //------------------------------------------- |
85fec35d | 178 | Float_t AliMUONResponseV0::IntXY(Int_t idDE, |
179 | AliMUONGeometrySegmentation* segmentation) | |
180 | const | |
a713db22 | 181 | { |
182 | // Calculate charge on current pad according to Mathieson distribution | |
a9e2aefa | 183 | |
a713db22 | 184 | return fMathieson->IntXY(idDE, segmentation); |
185 | } | |
885d501b | 186 | |
187 | ||
a713db22 | 188 | //------------------------------------------- |
85fec35d | 189 | Int_t AliMUONResponseV0::DigitResponse(Int_t digit, |
190 | AliMUONTransientDigit* /*where*/) | |
191 | const | |
a9e2aefa | 192 | { |
32c9ead9 | 193 | // \deprecated method |
194 | // Now part of the digitizer (where it belongs really), e.g. DigitizerV3 | |
195 | // | |
196 | // add white noise and do zero-suppression and signal truncation | |
197 | ||
198 | // Float_t meanNoise = gRandom->Gaus(1, 0.2); | |
b64652f5 | 199 | // correct noise for slat chambers; |
200 | // one more field to add to AliMUONResponseV0 to allow different noises ???? | |
885d501b | 201 | // Float_t meanNoise = gRandom->Gaus(1., 0.2); |
202 | // Float_t noise = gRandom->Gaus(0., meanNoise); | |
203 | Float_t noise = gRandom->Gaus(0., 1.0); | |
104b5ac2 | 204 | digit += TMath::Nint(noise); |
ddc10e24 | 205 | if ( digit <= ZeroSuppression()) digit = 0; |
4ac9d21e | 206 | // if ( digit > MaxAdc()) digit=MaxAdc(); |
885d501b | 207 | if ( digit > Saturation()) |
208 | { | |
209 | digit=Saturation(); | |
210 | } | |
4ac9d21e | 211 | |
a9e2aefa | 212 | return digit; |
213 | } | |
214 | ||
885d501b | 215 | //_____________________________________________________________________________ |
216 | Float_t | |
217 | AliMUONResponseV0::GetAnod(Float_t x) const | |
218 | { | |
219 | // | |
220 | // Return wire coordinate closest to x. | |
221 | // | |
222 | Int_t n = Int_t(x/Pitch()); | |
223 | Float_t wire = (x>0) ? n+0.5 : n-0.5; | |
224 | return Pitch()*wire; | |
225 | } | |
a9e2aefa | 226 | |
885d501b | 227 | //______________________________________________________________________________ |
228 | void | |
229 | AliMUONResponseV0::DisIntegrate(const AliMUONHit& hit, TList& digits) | |
230 | { | |
231 | // | |
32c9ead9 | 232 | // Go from 1 hit to a list of digits. |
233 | // The energy deposition of that hit is first converted into charge | |
234 | // (in IntPH() method), and then this charge is dispatched on several | |
235 | // pads, according to the Mathieson distribution. | |
885d501b | 236 | // |
237 | ||
238 | digits.Clear(); | |
239 | ||
240 | Int_t detElemId = hit.DetElemId(); | |
241 | ||
885d501b | 242 | // Width of the integration area |
885d501b | 243 | Double_t dx = SigmaIntegration()*ChargeSpreadX(); |
244 | Double_t dy = SigmaIntegration()*ChargeSpreadY(); | |
245 | ||
246 | // Use that (dx,dy) to specify the area upon which | |
247 | // we will iterate to spread charge into. | |
248 | Double_t x,y,z; | |
249 | Global2Local(detElemId,hit.X(),hit.Y(),hit.Z(),x,y,z); | |
250 | x = GetAnod(x); | |
251 | TVector2 hitPosition(x,y); | |
252 | AliMpArea area(hitPosition,TVector2(dx,dy)); | |
253 | ||
32c9ead9 | 254 | // Get pulse height from energy loss. |
885d501b | 255 | Float_t qtot = IntPH(hit.Eloss()); |
256 | ||
32c9ead9 | 257 | // Get the charge correlation between cathodes. |
885d501b | 258 | Float_t currentCorrel = TMath::Exp(gRandom->Gaus(0.0,ChargeCorrel()/2.0)); |
a9e2aefa | 259 | |
885d501b | 260 | for ( Int_t cath = 0; cath < 2; ++cath ) |
261 | { | |
262 | Float_t qcath = qtot * ( cath == 0 ? currentCorrel : 1.0/currentCorrel); | |
263 | ||
885d501b | 264 | // Get an iterator to loop over pads, within the given area. |
32c9ead9 | 265 | const AliMpVSegmentation* seg = |
885d501b | 266 | Segmentation()->GetMpSegmentation(detElemId,cath); |
885d501b | 267 | |
32c9ead9 | 268 | AliMpVPadIterator* it = seg->CreateIterator(area); |
269 | ||
270 | if (!it) | |
271 | { | |
272 | AliError(Form("Could not get iterator for detElemId %d",detElemId)); | |
273 | return; | |
274 | } | |
275 | ||
276 | // Start loop over pads. | |
277 | it->First(); | |
278 | ||
279 | if ( it->IsDone() ) | |
280 | { | |
281 | // Exceptional case : iterator is built, but is invalid from the start. | |
282 | AliMpPad pad = seg->PadByPosition(area.Position(),kFALSE); | |
283 | if ( pad.IsValid() ) | |
885d501b | 284 | { |
32c9ead9 | 285 | AliWarning(Form("Got an invalid iterator bug (area.Position() is within " |
286 | " DE but the iterator is void) for detElemId %d cath %d", | |
287 | detElemId,cath)); | |
885d501b | 288 | } |
32c9ead9 | 289 | else |
885d501b | 290 | { |
32c9ead9 | 291 | AliError(Form("Got an invalid iterator bug for detElemId %d cath %d." |
292 | "Might be a bad hit ? area.Position()=(%e,%e) " | |
293 | "Dimensions()=(%e,%e)", | |
294 | detElemId,cath,area.Position().X(),area.Position().Y(), | |
295 | area.Dimensions().X(),area.Dimensions().Y())); | |
885d501b | 296 | } |
297 | delete it; | |
32c9ead9 | 298 | return; |
299 | } | |
300 | ||
301 | while ( !it->IsDone() ) | |
302 | { | |
303 | // For each pad given by the iterator, compute the charge of that | |
304 | // pad, according to the Mathieson distribution. | |
305 | AliMpPad pad = it->CurrentItem(); | |
306 | TVector2 lowerLeft(hitPosition-pad.Position()-pad.Dimensions()); | |
307 | TVector2 upperRight(lowerLeft + pad.Dimensions()*2.0); | |
308 | Float_t qp = TMath::Abs(fMathieson->IntXY(lowerLeft.X(),lowerLeft.Y(), | |
309 | upperRight.X(),upperRight.Y())); | |
310 | ||
311 | Int_t icharge = Int_t(qp*qcath); | |
312 | ||
313 | if ( qp > fChargeThreshold ) | |
314 | { | |
315 | // If we're above threshold, then we create a digit, | |
316 | // and fill it with relevant information, including electronics. | |
317 | AliMUONDigit* d = new AliMUONDigit; | |
318 | d->SetDetElemId(detElemId); | |
319 | d->SetPadX(pad.GetIndices().GetFirst()); | |
320 | d->SetPadY(pad.GetIndices().GetSecond()); | |
321 | d->SetSignal(icharge); | |
322 | d->AddPhysicsSignal(d->Signal()); | |
323 | d->SetCathode(cath); | |
324 | d->SetElectronics(pad.GetLocation().GetFirst(), | |
325 | pad.GetLocation().GetSecond()); | |
326 | digits.Add(d); | |
327 | } | |
328 | it->Next(); | |
329 | } | |
330 | delete it; | |
885d501b | 331 | } |
332 | } | |
a9e2aefa | 333 | |
334 | ||
335 |