/* $Id$ */
-#include <TMath.h>
-#include <TRandom.h>
+// --------------------------
+// Class AliMUONResponseV0
+// --------------------------
+// Implementation of
+// Mathieson response
#include "AliMUONResponseV0.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 "AliMpSegmentation.h"
+#include "AliMpVSegmentation.h"
+#include "AliMpCathodType.h"
+
+#include "AliRun.h"
#include "AliLog.h"
+#include "Riostream.h"
+#include "TVector2.h"
+#include <TMath.h>
+#include <TRandom.h>
+
+/// \cond CLASSIMP
ClassImp(AliMUONResponseV0)
+/// \endcond
-//__________________________________________________________________________
-AliMUONResponseV0::AliMUONResponseV0()
- : AliMUONResponse()
+AliMUON* muon()
{
-// Default constructor
+ return static_cast<AliMUON*>(gAlice->GetModule("MUON"));
+}
- fMathieson = new AliMUONMathieson();
- fChargeCorrel = 0;
+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);
}
- //_________________________________________________________________________
-AliMUONResponseV0::AliMUONResponseV0(const AliMUONResponseV0& rhs)
- : AliMUONResponse(rhs)
+AliMUONSegmentation* Segmentation()
{
-// Protected copy constructor
+ static AliMUONSegmentation* segmentation = muon()->GetSegmentation();
+ return segmentation;
+}
- AliFatal("Not implemented.");
+//__________________________________________________________________________
+AliMUONResponseV0::AliMUONResponseV0()
+ : AliMUONResponse(),
+ fChargeSlope(0.0),
+ fChargeSpreadX(0.0),
+ fChargeSpreadY(0.0),
+ fSigmaIntegration(0.0),
+ fMaxAdc(0),
+ fSaturation(0),
+ fZeroSuppression(0),
+ fChargeCorrel(0.0),
+ fMathieson(new AliMUONMathieson),
+ fChargeThreshold(1e-4)
+{
+ /// Normal constructor
+ AliDebug(1,Form("Default ctor"));
}
- //__________________________________________________________________________
+//__________________________________________________________________________
AliMUONResponseV0::~AliMUONResponseV0()
{
+/// Destructor
+
+ AliDebug(1,"");
delete fMathieson;
}
- //________________________________________________________________________
-AliMUONResponseV0& AliMUONResponseV0::operator = (const AliMUONResponseV0& rhs)
+//______________________________________________________________________________
+void
+AliMUONResponseV0::Print(Option_t*) const
{
-// Protected assignement operator
+/// Printing
- if (this == &rhs) return *this;
-
- AliFatal("Not implemented.");
-
- return *this;
+ cout << " ChargeSlope=" << fChargeSlope
+ << " ChargeSpreadX,Y=" << fChargeSpreadX
+ << fChargeSpreadY
+ << " ChargeCorrelation=" << fChargeCorrel
+ << endl;
}
//__________________________________________________________________________
void AliMUONResponseV0::SetSqrtKx3AndDeriveKx2Kx4(Float_t SqrtKx3)
{
- // Set to "SqrtKx3" the Mathieson parameter K3 ("fSqrtKx3")
- // in the X direction, perpendicular to the wires,
- // and derive the Mathieson parameters K2 ("fKx2") and K4 ("fKx4")
- // in the same direction
+ /// Set to "SqrtKx3" the Mathieson parameter K3 ("fSqrtKx3")
+ /// in the X direction, perpendicular to the wires,
+ /// and derive the Mathieson parameters K2 ("fKx2") and K4 ("fKx4")
+ /// in the same direction
fMathieson->SetSqrtKx3AndDeriveKx2Kx4(SqrtKx3);
}
//__________________________________________________________________________
void AliMUONResponseV0::SetSqrtKy3AndDeriveKy2Ky4(Float_t SqrtKy3)
{
- // Set to "SqrtKy3" the Mathieson parameter K3 ("fSqrtKy3")
- // in the Y direction, along the wires,
- // and derive the Mathieson parameters K2 ("fKy2") and K4 ("fKy4")
- // in the same direction
+ /// Set to "SqrtKy3" the Mathieson parameter K3 ("fSqrtKy3")
+ /// in the Y direction, along the wires,
+ /// and derive the Mathieson parameters K2 ("fKy2") and K4 ("fKy4")
+ /// in the same direction
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
+ /// Calculate charge from given ionization energy loss
Int_t nel;
nel= Int_t(eloss*1.e9/27.4);
Float_t charge=0;
}
//-------------------------------------------
-Float_t AliMUONResponseV0::IntXY(Int_t idDE, AliMUONGeometrySegmentation* segmentation)
+Float_t AliMUONResponseV0::IntXY(Int_t idDE,
+ AliMUONGeometrySegmentation* segmentation)
+const
{
- // Calculate charge on current pad according to Mathieson distribution
+ /// Calculate charge on current pad according to Mathieson distribution
return fMathieson->IntXY(idDE, segmentation);
}
- //-------------------------------------------
-Int_t AliMUONResponseV0::DigitResponse(Int_t digit, AliMUONTransientDigit* /*where*/)
-{
- // 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 += TMath::Nint(noise);
- if ( digit <= ZeroSuppression()) digit = 0;
- // if ( digit > MaxAdc()) digit=MaxAdc();
- 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 = AliMp::kCath0; cath <= AliMp::kCath1; ++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 =
+ AliMpSegmentation::Instance()
+ ->GetMpSegmentation(detElemId,AliMp::GetCathodType(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;
+ }
+}
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