Import Geant4 3.0.0 source tree

source/parameterisations/include/G4GamDistrXrayTRmodel.hh

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+// This code implementation is the intellectual property of
+// the RD44 GEANT4 collaboration.
+//
+// By copying, distributing or modifying the Program (or any work
+// based on the Program) you indicate your acceptance of this statement,
+// and all its terms.
+//
+// $Id: G4GamDistrXrayTRmodel.hh,v 1.1 2000/11/14 16:05:31 gcosmo Exp $
+// GEANT4 tag $Name: geant4-03-00 $
+//
+// 
+///////////////////////////////////////////////////////////////////////////
+// 
+// Rough model describing a radiator of X-ray transition radiation.  
+// Thicknesses of plates and gas gaps are distributed according to gamma 
+// distribution. x are thicknesses of plates or gas gaps:
+//
+// p(x) = (alpha/<x>)^alpha * x^(alpha-1) * exp(-alpha*x/<x>) / G(alpha)
+//
+// G(alpha) is Euler's gamma function.
+// Plates have mean <x> = fPlateThick > 0 and power alpha = fAlphaPlate > 0 :
+// Gas gaps have mean <x> = fGasThick > 0 and power alpha = fAlphaGas > 0 :
+// We suppose that:
+// formation zone ~ mean thickness << absorption length
+// for each material and in the range 1-100 keV. This allows us to simplify
+// interference effects in radiator stack (GetStackFactor method).
+// 
+// 
+// History:
+// 11.02.00 V. Grichine, first version 
+//
+
+
+#ifndef G4GamDistrXrayTRmodel_h
+#define G4GamDistrXrayTRmodel_h 1
+
+#include "G4VFastSimulationModel.hh"
+// #include "G4ForwardXrayTR.hh"
+
+#include "G4VXrayTRmodel.hh"
+
+class G4GamDistrXrayTRmodel : public G4VXrayTRmodel
+{
+public:
+
+   G4GamDistrXrayTRmodel (G4LogicalVolume *anEnvelope,
+                           G4double,G4double,
+                           G4double,G4double     );
+  ~G4GamDistrXrayTRmodel ();
+
+  // Pure virtual function from base class
+
+  G4double GetStackFactor( G4double energy, G4double gamma, G4double varAngle);
+
+private:
+
+  G4double fAlphaPlate, fAlphaGas ;
+};
+
+#endif