KVElasticScatter.cpp

/*
$Id: KVElasticScatter.cpp,v 1.9 2007/04/04 10:39:17 ebonnet Exp $
$Revision: 1.9 $
$Date: 2007/04/04 10:39:17 $
*/
 
//Created by KVClassFactory on Thu Oct 19 22:31:02 2006
//Author: John Frankland
 
#include "KVElasticScatter.h"
#include "KVMultiDetArray.h"
#include "TH1F.h"
#include "KVDetector.h"
#include "KVGroup.h"
#include "KVTarget.h"
#include "KV2Body.h"
#include "TObjArray.h"
 
using namespace std;
 
ClassImp(KVElasticScatter)
 
 
 
KVElasticScatter::KVElasticScatter(): fBeamDirection(0, 0, 1)
{
   //Default constructor
   fDepth = 0;
   fTheta = 0;
   fBinE = 500;
   fEnergy = 0;
   fKinematics = 0;
   fTarget = 0;
   fIntLayer = fNDets = 0;
   fDetector = 0;
   fMultiLayer = kFALSE;
   fExx = 0.;
   fHistos = 0;
   has_outgoing = false;
   if (gMultiDetArray) {
      gMultiDetArray->SetSimMode(kTRUE);
   }
   else {
      Warning("KVElasticScatter", "gMultiDetArray does not refer to a valid multidetector array");
      printf("Define it before using this class, and put it in simulation mode : gMultiDetArray->SetSimMode(kTRUE)");
   }
}
 
 
 
 
 
KVElasticScatter::~KVElasticScatter()
{
   //Destructor
   if (fDepth)
      delete fDepth;
   if (fTheta)
      delete fTheta;
   if (fKinematics)
      delete fKinematics;
   if (fHistos)
      delete fHistos;
   gMultiDetArray->SetSimMode(kFALSE);
}
 
 
 
 
 
void KVElasticScatter::SetRun(Int_t run)
{
   //Set detector parameters, target, etc. for run
   gMultiDetArray->SetParameters(run);
   fTarget = gMultiDetArray->GetTarget();
   fTarget->SetRandomized();
   fIntLayer = 0;
   fMultiLayer = (fTarget->NumberOfLayers() > 1);
}
 
 
 
 
 
void KVElasticScatter::SetProjectile(Int_t Z, Int_t A)
{
   //Set projectile Z and A
 
   fProj.SetZandA(Z, A);
}
 
 
 
 
 
void KVElasticScatter::SetEnergy(Double_t e)
{
   //Set energy of projectile in MeV
 
   fProj.SetEnergy(e);
   fEnergy = e;
}
 
 
 
 
 
void KVElasticScatter::SetDetector(const Char_t* det)
{
   // Give name of detector towards which elastic scattering will occur.
   //
   // \note this does not necessarily mean that the particle will actually
   // arrive in the given detector (it may stop before it), but the aim is to
   // define the trajectory of the particle in the array.
 
   fDetector = gMultiDetArray->GetDetector(det);
   if (!fDetector) {
      Error("SetDetector", "Detector %s is unknown!", det);
      return;
   }
   // get trajectory for detector
   if (fDetector->GetNode()->GetNTraj() > 1) {
      Warning("SetDetector", "Ambiguous trajectory choice: detector %s has %d trajectories", det, fDetector->GetNode()->GetNTraj());
   }
   auto traj = (KVGeoDNTrajectory*)fDetector->GetNode()->GetTrajectories()->First();
   Info("SetDetector", "Using trajectory: %s", traj->GetName());
 
   //we store the association between detector type and index in list
   fDetInd.Clear();
   fAlignedDetectors.Clear();
 
   traj->IterateBackFrom();
 
   Int_t i = 0;
   KVGeoDetectorNode* gdn = nullptr;
   while ((gdn = traj->GetNextNode())) {
      KVDetector* d = gdn->GetDetector();
      fAlignedDetectors.Add(d);
      fDetInd.SetValue(d->GetLabel(), i);
      ++i;
   }
   //store number of aligned detectors
   fNDets = i;
}
 
 
 
 
 
void KVElasticScatter::SetTargetScatteringLayer(const Char_t* name)
{
   //For multilayer targets, use this method to choose in which
   //layer the scattering will take place.
   //If name="", reset any previous choice so that scattering
   //can take place in any layer
   if (!fTarget) {
      cout <<
           "<KVElasticScatter::SetTargetScatteringLayer> : No target set. Set run first."
           << endl;
      return;
   }
   fIntLayer = fTarget->GetLayerIndex(name);
   if (fIntLayer)
      fTarget->SetInteractionLayer(fIntLayer, fBeamDirection);
}
 
 
 
 
 
void KVElasticScatter::SetEbinning(Int_t nbins)
{
   //Set binning of the GetEnergy histogram
   // Default value is 500
   fBinE = nbins;
}
 
 
 
 
void KVElasticScatter::CalculateScattering(Int_t N)
{
   //Perform scattering 'N' times for current values
   //of particle Z, A and energy, target excited state, and detector.
 
   if (!fProj.IsDefined()) {
      cout <<
           "<KVElasticScatter::CalculateScattering> : Set projectile properties first"
           << endl;
      return;
   }
   if (!fEnergy) {
      cout <<
           "<KVElasticScatter::CalculateScattering> : Set projectile energy first"
           << endl;
      return;
   }
   if (!fDetector) {
      cout <<
           "<KVElasticScatter::CalculateScattering> : Set detector first" <<
           endl;
      return;
   }
   if (!fTarget) {
      cout <<
           "<KVElasticScatter::CalculateScattering> : No target set. Set run first."
           << endl;
      return;
   }
 
   /* -------------------------------------------------------------------------------------------------------------------------- */
 
   //set up histograms
 
   /* -------------------------------------------------------------------------------------------------------------------------- */
 
   // -- histograms for debugging: depth in target and angular distribution
   if (fDepth)
      delete fDepth;
   if (fTheta)
      delete fTheta;
   fDepth =
      new TH1F("hDepth", "Depth (mg/cm2)", 500, 0.,
               fTarget->GetTotalEffectiveThickness());
   fTheta = new TH1F("hTheta", "Theta (deg.)", 500, 0., 0.);
 
   /* -------------------------------------------------------------------------------------------------------------------------- */
 
   //set up histograms for all detectors particle passes through
   if (!fHistos) {
      fHistos = new TObjArray(fAlignedDetectors.GetSize());
      fHistos->SetOwner();      //will delete histos it stores
   }
   else {
      fHistos->Clear();         //delete any previous histograms
   }
   KVDetector* d;
   TIter n(&fAlignedDetectors);
   while ((d = (KVDetector*) n())) {
      fHistos->
      Add(new
          TH1F(Form("hEloss_%s", d->GetName()), "Eloss (MeV)", fBinE, 0., 0.));
   }
 
   /* -------------------------------------------------------------------------------------------------------------------------- */
 
   //set up kinematics
   if (!fKinematics)
      fKinematics = new KV2Body;
   fProj.SetEnergy(fEnergy);
   fProj.SetTheta(0);
 
   /* -------------------------------------------------------------------------------------------------------------------------- */
 
   //set random interaction point for scattering
   if (fIntLayer) {
      fTarget->SetInteractionLayer(fIntLayer, fBeamDirection);
   }
   else {
      fTarget->GetInteractionPoint(&fProj);
   }
 
   /* -------------------------------------------------------------------------------------------------------------------------- */
 
   //get target nucleus properties from scattering layer
   TVector3 IP = fTarget->GetInteractionPoint();
   KVMaterial* targ_mat = fTarget->GetLayer(IP);
   KVNucleus t;
   t.SetZ((Int_t) targ_mat->GetZ());
   t.SetA((Int_t) targ_mat->GetMass());
   fKinematics->SetTarget(t);
 
   /* -------------------------------------------------------------------------------------------------------------------------- */
 
   //set excited state of target nucleus - in other words, dissipated energy for
   //reaction due to excitation of target
   // check order !!!
   fKinematics->SetEDiss(fExx);
 
   /* -------------------------------------------------------------------------------------------------------------------------- */
 
   Double_t xsec;
   for (int i = 0; i < N; i++) {
      //calculate slowing of incoming projectile
      fTarget->SetIncoming();
      fTarget->DetectParticle(&fProj);
      fKinematics->SetProjectile(fProj);
      if (!has_outgoing) fOutgoing = fProj;
 
      fKinematics->SetOutgoing(fOutgoing);
//      else fKinematics->SetOutgoing(fProj);
      fKinematics->CalculateKinematics();
      //set random direction of outgoing projectile
 
      double th, ph;
      th = ph = 0.;
      fDetector->GetRandomAngles(th, ph);
 
      //set energy of scattered nucleus
      //WARNING: for inverse kinematics reactions, their are two energies for
      //each angle below the maximum scattering angle.
      //We only use the highest energy corresponding to the most forward CM angle.
      Double_t e1, e2;
      fKinematics->GetELab(3, th, 3, e1, e2);
      fOutgoing.SetEnergy(TMath::Max(e1, e2));
      fOutgoing.SetTheta(th);
      fOutgoing.SetPhi(ph);
      xsec = TMath::Abs(fKinematics->GetXSecRuthLab(fOutgoing.GetTheta()));
      fTheta->Fill(fOutgoing.GetTheta(), xsec);
      //slowing of outgoing projectile in target
      fTarget->SetOutgoing();
//      fTarget->DetectParticle(&fProj);
      fTarget->DetectParticle(&fOutgoing);
      fDepth->Fill(IP.z());
 
      //now detect particle in detector(s)
      int j = 0;
      n.Reset();
      while ((d = (KVDetector*) n())) {
         auto cew = d->GetCentreOfEntranceWindow();
         d->DetectParticle(&fOutgoing, &cew);
         //fill histograms
         ((TH1F*)(*fHistos)[j++])->Fill(d->GetEnergy(), xsec);
         //prepare for next round: set energy loss to zero
         d->Clear();
      }
      fProj.SetEnergy(fEnergy);
      fProj.SetTheta(0);
      fProj.GetParameters()->Clear();
      fOutgoing.GetParameters()->Clear();
      //set random interaction point for scattering
      if (fIntLayer) {
         fTarget->SetInteractionLayer(fIntLayer, fBeamDirection);
      }
      else {
         fTarget->GetInteractionPoint(&fProj);
         //if target is multilayer and the interaction layer is not fixed,
         //the layer & hence the target nucleus may change
         if (fMultiLayer) {
            targ_mat = fTarget->GetLayer(fTarget->GetInteractionPoint());
            KVNucleus t;
            t.SetZandA((Int_t) targ_mat->GetZ(), (Int_t) targ_mat->GetMass());
            fKinematics->SetTarget(t);
         }
      }
      IP = fTarget->GetInteractionPoint();
   }
}
 
 
 
 
 
 
TH1F* KVElasticScatter::GetEnergy(const Char_t* label)
{
   //Energy loss in detector with given 'label' through which scattered particle passes.
 
   return (fDetInd.HasParameter(label) ? GetEnergy(fDetInd.GetIntValue(label)) : 0);
}
 
 
 
 
 
TH1F* KVElasticScatter::GetEnergy(Int_t index)
{
   //Energy loss in any detector through which scattered particle passes.
   //
   //The index corresponds to the order in which detectors are crossed by the
   //particle, beginning with 0 for the first detector, and ending with
   //(GetNDets()-1)
   return (TH1F*)(*fHistos)[index];
}
 
 
//__________________________________________________________________//