/* $Id$ */
-#include <TMath.h>
-#include <TRandom.h>
+// --------------------------
+// Class AliMUONResponseV0
+// --------------------------
+// Implementation of Mathieson response
+// ...
#include "AliMUONResponseV0.h"
-#include "AliSegmentation.h"
+
+#include "AliLog.h"
+#include "AliMUON.h"
+#include "AliMUONConstants.h"
+#include "AliMUONDigit.h"
+#include "AliMUONGeometrySegmentation.h"
+#include "AliMUONGeometryTransformer.h"
+#include "AliMUONHit.h"
+#include "AliMUONSegmentation.h"
+#include "AliMpArea.h"
+#include "AliMpDEManager.h"
+#include "AliMpVPadIterator.h"
+#include "AliMpVSegmentation.h"
+#include "AliRun.h"
+#include "Riostream.h"
+#include "TVector2.h"
+#include <TMath.h>
+#include <TRandom.h>
ClassImp(AliMUONResponseV0)
+AliMUON* muon()
+{
+ return static_cast<AliMUON*>(gAlice->GetModule("MUON"));
+}
+
+void Global2Local(Int_t detElemId, Double_t xg, Double_t yg, Double_t zg,
+ Double_t& xl, Double_t& yl, Double_t& zl)
+{
+ // ideally should be :
+ // Double_t x,y,z;
+ // AliMUONGeometry::Global2Local(detElemId,xg,yg,zg,x,y,z);
+ // but while waiting for this geometry singleton, let's go through
+ // AliMUON still.
+
+ const AliMUONGeometryTransformer* transformer = muon()->GetGeometryTransformer();
+ transformer->Global2Local(detElemId,xg,yg,zg,xl,yl,zl);
+}
+
+AliMUONSegmentation* Segmentation()
+{
+ static AliMUONSegmentation* segmentation = muon()->GetSegmentation();
+ return segmentation;
+}
+
//__________________________________________________________________________
AliMUONResponseV0::AliMUONResponseV0()
- : AliMUONResponse()
+ : AliMUONResponse(),
+ fChargeSlope(0.0),
+ fChargeSpreadX(0.0),
+ fChargeSpreadY(0.0),
+ fSigmaIntegration(0.0),
+ fMaxAdc(0),
+ fZeroSuppression(0),
+ fChargeCorrel(0.0),
+ fMathieson(new AliMUONMathieson),
+ fChargeThreshold(1e-4)
{
-// Default constructor
+ // Normal constructor
+ AliDebug(1,Form("Default ctor"));
+}
+
+ //_________________________________________________________________________
+AliMUONResponseV0::AliMUONResponseV0(const AliMUONResponseV0& rhs)
+ : AliMUONResponse(rhs)
+{
+// Protected copy constructor
+
+ AliFatal("Not implemented.");
+}
+
+ //__________________________________________________________________________
+AliMUONResponseV0::~AliMUONResponseV0()
+{
+ AliDebug(1,"");
+ delete fMathieson;
+}
+
+ //________________________________________________________________________
+AliMUONResponseV0& AliMUONResponseV0::operator = (const AliMUONResponseV0& rhs)
+{
+// Protected assignement operator
+
+ if (this == &rhs) return *this;
+
+ AliFatal("Not implemented.");
+
+ return *this;
+}
+
+//______________________________________________________________________________
+void
+AliMUONResponseV0::Print(Option_t*) const
+{
+// Printing
+
+ cout << " ChargeSlope=" << fChargeSlope
+ << " ChargeSpreadX,Y=" << fChargeSpreadX
+ << fChargeSpreadY
+ << " ChargeCorrelation=" << fChargeCorrel
+ << endl;
+
+//Float_t fChargeSlope; // Slope of the charge distribution
+//Float_t fChargeSpreadX; // Width of the charge distribution in x
+//Float_t fChargeSpreadY; // Width of the charge distribution in y
+//Float_t fSigmaIntegration; // Number of sigma's used for charge distribution
+//Int_t fMaxAdc; // Maximum ADC channel
+//Int_t fSaturation; // Pad saturation in ADC channel
+//Int_t fZeroSuppression; // Zero suppression threshold
+//Float_t fChargeCorrel; // amplitude of charge correlation on 2 cathods
+// // is RMS of ln(q1/q2)
+//AliMUONMathieson* fMathieson; // pointer to mathieson fct
+//Float_t fChargeThreshold; // Charges below this threshold are = 0
+//
- fChargeCorrel = 0;
}
//__________________________________________________________________________
// in the X direction, perpendicular to the wires,
// and derive the Mathieson parameters K2 ("fKx2") and K4 ("fKx4")
// in the same direction
- fSqrtKx3 = SqrtKx3;
- fKx2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKx3);
- Float_t cx1 = fKx2 * fSqrtKx3 / 4. / TMath::ATan(Double_t(fSqrtKx3));
- fKx4 = cx1 / fKx2 / fSqrtKx3;
+ fMathieson->SetSqrtKx3AndDeriveKx2Kx4(SqrtKx3);
}
//__________________________________________________________________________
// in the Y direction, along the wires,
// and derive the Mathieson parameters K2 ("fKy2") and K4 ("fKy4")
// in the same direction
- fSqrtKy3 = SqrtKy3;
- fKy2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKy3);
- Float_t cy1 = fKy2 * fSqrtKy3 / 4. / TMath::ATan(Double_t(fSqrtKy3));
- fKy4 = cy1 / fKy2 / fSqrtKy3;
+ fMathieson->SetSqrtKy3AndDeriveKy2Ky4(SqrtKy3);
}
-
-Float_t AliMUONResponseV0::IntPH(Float_t eloss)
+ //__________________________________________________________________________
+Float_t AliMUONResponseV0::IntPH(Float_t eloss) const
{
// Calculate charge from given ionization energy loss
Int_t nel;
}
return charge;
}
-// -------------------------------------------
-Float_t AliMUONResponseV0::IntXY(AliSegmentation * segmentation)
+ //-------------------------------------------
+Float_t AliMUONResponseV0::IntXY(Int_t idDE,
+ AliMUONGeometrySegmentation* segmentation)
+const
{
-// Calculate charge on current pad according to Mathieson distribution
-//
- const Float_t kInversePitch = 1/fPitch;
-//
-// Integration limits defined by segmentation model
-//
- Float_t xi1, xi2, yi1, yi2;
- segmentation->IntegrationLimits(xi1,xi2,yi1,yi2);
- xi1=xi1*kInversePitch;
- xi2=xi2*kInversePitch;
- yi1=yi1*kInversePitch;
- yi2=yi2*kInversePitch;
-//
-// The Mathieson function
- Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1);
- Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2);
-
- Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1);
- Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2);
+ // Calculate charge on current pad according to Mathieson distribution
-
- return Float_t(4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))*
- fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1)));
+ return fMathieson->IntXY(idDE, segmentation);
}
-Int_t AliMUONResponseV0::DigitResponse(Int_t digit, AliMUONTransientDigit* /*where*/)
+
+ //-------------------------------------------
+Int_t AliMUONResponseV0::DigitResponse(Int_t digit,
+ AliMUONTransientDigit* /*where*/)
+const
{
- // add white noise and do zero-suppression and signal truncation
-// Float_t meanNoise = gRandom->Gaus(1, 0.2);
+ // \deprecated method
+ // Now part of the digitizer (where it belongs really), e.g. DigitizerV3
+ //
+ // add white noise and do zero-suppression and signal truncation
+
+ // Float_t meanNoise = gRandom->Gaus(1, 0.2);
// correct noise for slat chambers;
// one more field to add to AliMUONResponseV0 to allow different noises ????
- Float_t meanNoise = gRandom->Gaus(1., 0.2);
- Float_t noise = gRandom->Gaus(0., meanNoise);
- digit+=(Int_t)noise;
+// Float_t meanNoise = gRandom->Gaus(1., 0.2);
+// Float_t noise = gRandom->Gaus(0., meanNoise);
+ Float_t noise = gRandom->Gaus(0., 1.0);
+ digit += TMath::Nint(noise);
if ( digit <= ZeroSuppression()) digit = 0;
// if ( digit > MaxAdc()) digit=MaxAdc();
- if ( digit > Saturation()) digit=Saturation();
+ if ( digit > Saturation())
+ {
+ digit=Saturation();
+ }
return digit;
}
+//_____________________________________________________________________________
+Float_t
+AliMUONResponseV0::GetAnod(Float_t x) const
+{
+ //
+ // Return wire coordinate closest to x.
+ //
+ Int_t n = Int_t(x/Pitch());
+ Float_t wire = (x>0) ? n+0.5 : n-0.5;
+ return Pitch()*wire;
+}
+//______________________________________________________________________________
+void
+AliMUONResponseV0::DisIntegrate(const AliMUONHit& hit, TList& digits)
+{
+ //
+ // Go from 1 hit to a list of digits.
+ // The energy deposition of that hit is first converted into charge
+ // (in IntPH() method), and then this charge is dispatched on several
+ // pads, according to the Mathieson distribution.
+ //
+
+ digits.Clear();
+
+ Int_t detElemId = hit.DetElemId();
+
+ // Width of the integration area
+ Double_t dx = SigmaIntegration()*ChargeSpreadX();
+ Double_t dy = SigmaIntegration()*ChargeSpreadY();
+
+ // Use that (dx,dy) to specify the area upon which
+ // we will iterate to spread charge into.
+ Double_t x,y,z;
+ Global2Local(detElemId,hit.X(),hit.Y(),hit.Z(),x,y,z);
+ x = GetAnod(x);
+ TVector2 hitPosition(x,y);
+ AliMpArea area(hitPosition,TVector2(dx,dy));
+
+ // Get pulse height from energy loss.
+ Float_t qtot = IntPH(hit.Eloss());
+
+ // Get the charge correlation between cathodes.
+ Float_t currentCorrel = TMath::Exp(gRandom->Gaus(0.0,ChargeCorrel()/2.0));
-
-
-
+ for ( Int_t cath = 0; cath < 2; ++cath )
+ {
+ Float_t qcath = qtot * ( cath == 0 ? currentCorrel : 1.0/currentCorrel);
+
+ // Get an iterator to loop over pads, within the given area.
+ const AliMpVSegmentation* seg =
+ Segmentation()->GetMpSegmentation(detElemId,cath);
+
+ AliMpVPadIterator* it = seg->CreateIterator(area);
+
+ if (!it)
+ {
+ AliError(Form("Could not get iterator for detElemId %d",detElemId));
+ return;
+ }
+
+ // Start loop over pads.
+ it->First();
+
+ if ( it->IsDone() )
+ {
+ // Exceptional case : iterator is built, but is invalid from the start.
+ AliMpPad pad = seg->PadByPosition(area.Position(),kFALSE);
+ if ( pad.IsValid() )
+ {
+ AliWarning(Form("Got an invalid iterator bug (area.Position() is within "
+ " DE but the iterator is void) for detElemId %d cath %d",
+ detElemId,cath));
+ }
+ else
+ {
+ AliError(Form("Got an invalid iterator bug for detElemId %d cath %d."
+ "Might be a bad hit ? area.Position()=(%e,%e) "
+ "Dimensions()=(%e,%e)",
+ detElemId,cath,area.Position().X(),area.Position().Y(),
+ area.Dimensions().X(),area.Dimensions().Y()));
+ }
+ delete it;
+ return;
+ }
+
+ while ( !it->IsDone() )
+ {
+ // For each pad given by the iterator, compute the charge of that
+ // pad, according to the Mathieson distribution.
+ AliMpPad pad = it->CurrentItem();
+ TVector2 lowerLeft(hitPosition-pad.Position()-pad.Dimensions());
+ TVector2 upperRight(lowerLeft + pad.Dimensions()*2.0);
+ Float_t qp = TMath::Abs(fMathieson->IntXY(lowerLeft.X(),lowerLeft.Y(),
+ upperRight.X(),upperRight.Y()));
+
+ Int_t icharge = Int_t(qp*qcath);
+
+ if ( qp > fChargeThreshold )
+ {
+ // If we're above threshold, then we create a digit,
+ // and fill it with relevant information, including electronics.
+ AliMUONDigit* d = new AliMUONDigit;
+ d->SetDetElemId(detElemId);
+ d->SetPadX(pad.GetIndices().GetFirst());
+ d->SetPadY(pad.GetIndices().GetSecond());
+ d->SetSignal(icharge);
+ d->AddPhysicsSignal(d->Signal());
+ d->SetCathode(cath);
+ d->SetElectronics(pad.GetLocation().GetFirst(),
+ pad.GetLocation().GetSecond());
+ digits.Add(d);
+ }
+ it->Next();
+ }
+ delete it;
+ }
+}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff