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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 | |
3d1463c8 | 18 | //----------------------------------------------------------------------------- |
d19b6003 | 19 | // Class AliMUONResponseV0 |
20 | // -------------------------- | |
9265505b | 21 | // Implementation of |
22 | // Mathieson response | |
3d1463c8 | 23 | //----------------------------------------------------------------------------- |
a9e2aefa | 24 | |
30178c30 | 25 | #include "AliMUONResponseV0.h" |
885d501b | 26 | #include "AliMUON.h" |
27 | #include "AliMUONConstants.h" | |
28 | #include "AliMUONDigit.h" | |
885d501b | 29 | #include "AliMUONGeometryTransformer.h" |
30 | #include "AliMUONHit.h" | |
9265505b | 31 | |
885d501b | 32 | #include "AliMpArea.h" |
33 | #include "AliMpDEManager.h" | |
885d501b | 34 | #include "AliMpVPadIterator.h" |
9265505b | 35 | #include "AliMpSegmentation.h" |
885d501b | 36 | #include "AliMpVSegmentation.h" |
866c3232 | 37 | #include "AliMpCathodType.h" |
9265505b | 38 | |
885d501b | 39 | #include "AliRun.h" |
9265505b | 40 | #include "AliLog.h" |
41 | ||
885d501b | 42 | #include "Riostream.h" |
43 | #include "TVector2.h" | |
44 | #include <TMath.h> | |
45 | #include <TRandom.h> | |
8c343c7c | 46 | |
9265505b | 47 | /// \cond CLASSIMP |
d5bfadcc | 48 | ClassImp(AliMUONResponseV0) |
9265505b | 49 | /// \endcond |
d5bfadcc | 50 | |
885d501b | 51 | AliMUON* muon() |
52 | { | |
53 | return static_cast<AliMUON*>(gAlice->GetModule("MUON")); | |
54 | } | |
55 | ||
56 | void Global2Local(Int_t detElemId, Double_t xg, Double_t yg, Double_t zg, | |
57 | Double_t& xl, Double_t& yl, Double_t& zl) | |
58 | { | |
9265505b | 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. | |
885d501b | 64 | |
65 | const AliMUONGeometryTransformer* transformer = muon()->GetGeometryTransformer(); | |
66 | transformer->Global2Local(detElemId,xg,yg,zg,xl,yl,zl); | |
67 | } | |
68 | ||
30178c30 | 69 | //__________________________________________________________________________ |
70 | AliMUONResponseV0::AliMUONResponseV0() | |
885d501b | 71 | : AliMUONResponse(), |
72 | fChargeSlope(0.0), | |
73 | fChargeSpreadX(0.0), | |
74 | fChargeSpreadY(0.0), | |
75 | fSigmaIntegration(0.0), | |
76 | fMaxAdc(0), | |
ccea41d4 | 77 | fSaturation(0), |
885d501b | 78 | fZeroSuppression(0), |
79 | fChargeCorrel(0.0), | |
80 | fMathieson(new AliMUONMathieson), | |
81 | fChargeThreshold(1e-4) | |
30178c30 | 82 | { |
9265505b | 83 | /// Normal constructor |
885d501b | 84 | AliDebug(1,Form("Default ctor")); |
30178c30 | 85 | } |
f29ba3e1 | 86 | |
2a7d64a9 | 87 | //__________________________________________________________________________ |
88 | AliMUONResponseV0::AliMUONResponseV0(const AliMUONResponseV0& other) | |
89 | : AliMUONResponse(), | |
90 | fChargeSlope(0.0), | |
91 | fChargeSpreadX(0.0), | |
92 | fChargeSpreadY(0.0), | |
93 | fSigmaIntegration(0.0), | |
94 | fMaxAdc(0), | |
95 | fSaturation(0), | |
96 | fZeroSuppression(0), | |
97 | fChargeCorrel(0.0), | |
98 | fMathieson(0), | |
99 | fChargeThreshold(1e-4) | |
100 | { | |
101 | /// copy ctor | |
102 | other.CopyTo(*this); | |
103 | } | |
104 | ||
105 | //__________________________________________________________________________ | |
106 | AliMUONResponseV0& | |
107 | AliMUONResponseV0::operator=(const AliMUONResponseV0& other) | |
108 | { | |
109 | /// Assignment operator | |
110 | other.CopyTo(*this); | |
111 | return *this; | |
112 | } | |
113 | ||
ccea41d4 | 114 | //__________________________________________________________________________ |
a713db22 | 115 | AliMUONResponseV0::~AliMUONResponseV0() |
116 | { | |
9265505b | 117 | /// Destructor |
118 | ||
885d501b | 119 | AliDebug(1,""); |
a713db22 | 120 | delete fMathieson; |
121 | } | |
f29ba3e1 | 122 | |
2a7d64a9 | 123 | //______________________________________________________________________________ |
124 | void | |
125 | AliMUONResponseV0::CopyTo(AliMUONResponseV0& other) const | |
126 | { | |
127 | /// Copy *this to other | |
128 | other.fChargeSlope=fChargeSlope; | |
129 | other.fChargeSpreadX=fChargeSpreadX; | |
130 | other.fChargeSpreadY=fChargeSpreadY; | |
131 | other.fSigmaIntegration=fSigmaIntegration; | |
132 | other.fMaxAdc=fMaxAdc; | |
133 | other.fSaturation=fSaturation; | |
134 | other.fZeroSuppression=fZeroSuppression; | |
135 | other.fChargeCorrel=fChargeCorrel; | |
136 | delete other.fMathieson; | |
137 | other.fMathieson = new AliMUONMathieson(*fMathieson); | |
138 | other.fChargeThreshold=fChargeThreshold; | |
139 | } | |
140 | ||
885d501b | 141 | //______________________________________________________________________________ |
142 | void | |
143 | AliMUONResponseV0::Print(Option_t*) const | |
144 | { | |
9265505b | 145 | /// Printing |
d19b6003 | 146 | |
885d501b | 147 | cout << " ChargeSlope=" << fChargeSlope |
148 | << " ChargeSpreadX,Y=" << fChargeSpreadX | |
149 | << fChargeSpreadY | |
150 | << " ChargeCorrelation=" << fChargeCorrel | |
151 | << endl; | |
f29ba3e1 | 152 | } |
153 | ||
d5bfadcc | 154 | //__________________________________________________________________________ |
155 | void AliMUONResponseV0::SetSqrtKx3AndDeriveKx2Kx4(Float_t SqrtKx3) | |
156 | { | |
9265505b | 157 | /// Set to "SqrtKx3" the Mathieson parameter K3 ("fSqrtKx3") |
158 | /// in the X direction, perpendicular to the wires, | |
159 | /// and derive the Mathieson parameters K2 ("fKx2") and K4 ("fKx4") | |
160 | /// in the same direction | |
a713db22 | 161 | fMathieson->SetSqrtKx3AndDeriveKx2Kx4(SqrtKx3); |
d5bfadcc | 162 | } |
163 | ||
164 | //__________________________________________________________________________ | |
165 | void AliMUONResponseV0::SetSqrtKy3AndDeriveKy2Ky4(Float_t SqrtKy3) | |
166 | { | |
9265505b | 167 | /// Set to "SqrtKy3" the Mathieson parameter K3 ("fSqrtKy3") |
168 | /// in the Y direction, along the wires, | |
169 | /// and derive the Mathieson parameters K2 ("fKy2") and K4 ("fKy4") | |
170 | /// in the same direction | |
a713db22 | 171 | fMathieson->SetSqrtKy3AndDeriveKy2Ky4(SqrtKy3); |
d5bfadcc | 172 | } |
a713db22 | 173 | //__________________________________________________________________________ |
85fec35d | 174 | Float_t AliMUONResponseV0::IntPH(Float_t eloss) const |
a9e2aefa | 175 | { |
9265505b | 176 | /// Calculate charge from given ionization energy loss |
a9e2aefa | 177 | Int_t nel; |
4ac9d21e | 178 | nel= Int_t(eloss*1.e9/27.4); |
a9e2aefa | 179 | Float_t charge=0; |
180 | if (nel == 0) nel=1; | |
181 | for (Int_t i=1;i<=nel;i++) { | |
01997fa2 | 182 | Float_t arg=0.; |
183 | while(!arg) arg = gRandom->Rndm(); | |
184 | charge -= fChargeSlope*TMath::Log(arg); | |
a9e2aefa | 185 | } |
186 | return charge; | |
187 | } | |
a713db22 | 188 | |
885d501b | 189 | //_____________________________________________________________________________ |
190 | Float_t | |
191 | AliMUONResponseV0::GetAnod(Float_t x) const | |
192 | { | |
9265505b | 193 | /// Return wire coordinate closest to x. |
194 | ||
885d501b | 195 | Int_t n = Int_t(x/Pitch()); |
196 | Float_t wire = (x>0) ? n+0.5 : n-0.5; | |
197 | return Pitch()*wire; | |
198 | } | |
a9e2aefa | 199 | |
885d501b | 200 | //______________________________________________________________________________ |
201 | void | |
202 | AliMUONResponseV0::DisIntegrate(const AliMUONHit& hit, TList& digits) | |
203 | { | |
9265505b | 204 | /// Go from 1 hit to a list of digits. |
205 | /// The energy deposition of that hit is first converted into charge | |
206 | /// (in IntPH() method), and then this charge is dispatched on several | |
207 | /// pads, according to the Mathieson distribution. | |
885d501b | 208 | |
209 | digits.Clear(); | |
210 | ||
211 | Int_t detElemId = hit.DetElemId(); | |
212 | ||
885d501b | 213 | // Width of the integration area |
885d501b | 214 | Double_t dx = SigmaIntegration()*ChargeSpreadX(); |
215 | Double_t dy = SigmaIntegration()*ChargeSpreadY(); | |
216 | ||
217 | // Use that (dx,dy) to specify the area upon which | |
218 | // we will iterate to spread charge into. | |
219 | Double_t x,y,z; | |
220 | Global2Local(detElemId,hit.X(),hit.Y(),hit.Z(),x,y,z); | |
221 | x = GetAnod(x); | |
222 | TVector2 hitPosition(x,y); | |
223 | AliMpArea area(hitPosition,TVector2(dx,dy)); | |
224 | ||
32c9ead9 | 225 | // Get pulse height from energy loss. |
885d501b | 226 | Float_t qtot = IntPH(hit.Eloss()); |
227 | ||
32c9ead9 | 228 | // Get the charge correlation between cathodes. |
885d501b | 229 | Float_t currentCorrel = TMath::Exp(gRandom->Gaus(0.0,ChargeCorrel()/2.0)); |
a9e2aefa | 230 | |
866c3232 | 231 | for ( Int_t cath = AliMp::kCath0; cath <= AliMp::kCath1; ++cath ) |
885d501b | 232 | { |
233 | Float_t qcath = qtot * ( cath == 0 ? currentCorrel : 1.0/currentCorrel); | |
234 | ||
885d501b | 235 | // Get an iterator to loop over pads, within the given area. |
32c9ead9 | 236 | const AliMpVSegmentation* seg = |
866c3232 | 237 | AliMpSegmentation::Instance() |
238 | ->GetMpSegmentation(detElemId,AliMp::GetCathodType(cath)); | |
885d501b | 239 | |
32c9ead9 | 240 | AliMpVPadIterator* it = seg->CreateIterator(area); |
241 | ||
242 | if (!it) | |
243 | { | |
244 | AliError(Form("Could not get iterator for detElemId %d",detElemId)); | |
245 | return; | |
246 | } | |
247 | ||
248 | // Start loop over pads. | |
249 | it->First(); | |
250 | ||
251 | if ( it->IsDone() ) | |
252 | { | |
253 | // Exceptional case : iterator is built, but is invalid from the start. | |
254 | AliMpPad pad = seg->PadByPosition(area.Position(),kFALSE); | |
255 | if ( pad.IsValid() ) | |
885d501b | 256 | { |
32c9ead9 | 257 | AliWarning(Form("Got an invalid iterator bug (area.Position() is within " |
258 | " DE but the iterator is void) for detElemId %d cath %d", | |
259 | detElemId,cath)); | |
885d501b | 260 | } |
32c9ead9 | 261 | else |
885d501b | 262 | { |
32c9ead9 | 263 | AliError(Form("Got an invalid iterator bug for detElemId %d cath %d." |
264 | "Might be a bad hit ? area.Position()=(%e,%e) " | |
265 | "Dimensions()=(%e,%e)", | |
266 | detElemId,cath,area.Position().X(),area.Position().Y(), | |
267 | area.Dimensions().X(),area.Dimensions().Y())); | |
885d501b | 268 | } |
269 | delete it; | |
32c9ead9 | 270 | return; |
271 | } | |
272 | ||
273 | while ( !it->IsDone() ) | |
274 | { | |
275 | // For each pad given by the iterator, compute the charge of that | |
276 | // pad, according to the Mathieson distribution. | |
277 | AliMpPad pad = it->CurrentItem(); | |
278 | TVector2 lowerLeft(hitPosition-pad.Position()-pad.Dimensions()); | |
279 | TVector2 upperRight(lowerLeft + pad.Dimensions()*2.0); | |
280 | Float_t qp = TMath::Abs(fMathieson->IntXY(lowerLeft.X(),lowerLeft.Y(), | |
281 | upperRight.X(),upperRight.Y())); | |
282 | ||
283 | Int_t icharge = Int_t(qp*qcath); | |
284 | ||
285 | if ( qp > fChargeThreshold ) | |
286 | { | |
287 | // If we're above threshold, then we create a digit, | |
288 | // and fill it with relevant information, including electronics. | |
2a7d64a9 | 289 | AliMUONDigit* d = new AliMUONDigit(detElemId,pad.GetLocation().GetFirst(), |
290 | pad.GetLocation().GetSecond(),cath); | |
291 | d->SetPadXY(pad.GetIndices().GetFirst(),pad.GetIndices().GetSecond()); | |
292 | d->SetCharge(icharge); | |
32c9ead9 | 293 | digits.Add(d); |
294 | } | |
295 | it->Next(); | |
296 | } | |
297 | delete it; | |
885d501b | 298 | } |
299 | } | |
a9e2aefa | 300 | |
301 | ||
302 |