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nikolas |
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#include "PamVMCS4Dig.h" |
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#include <TRandom.h> |
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ClassImp(PamVMCS4Dig) |
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void PamVMCS4Dig::Digitize(){ |
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cout<<"Starting S4 Digitization...."<<endl; |
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//This is simple approximation, reflection + atennuation.. |
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//I hope in future we will use for generation and propagation of |
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//optical photons abilitiees of montecarlo... |
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Int_t DEBUG=1; |
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// creato: S. Borisov, INFN Roma2 e MEPHI, Sett 2007 |
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Int_t i,j,t,NdF,pmt,S4; |
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Float_t E0,X,Y,Z,x,y,z,V[3],q,w,l; |
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const Float_t Xs[2] = {-24.1, 24.1}; |
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const Float_t Ys[2] = {-24.1, 24.1}; |
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const Float_t Zs[2] = {-0.5, 0.5}; |
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const Float_t Yp[6] = {-20., -17., -1., 2., 17., 20.}; //PMT positions |
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const Float_t E1 = 1e-6; //Energy which we spend to produce 1 photon |
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const Float_t p = 0.1; |
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const Int_t l0 = 500; |
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const Int_t S4p = 32; //pedestal |
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UShort_t S4v = 0; // ADC count |
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Int_t NdFT = 0; |
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Float_t Ert = 0.; |
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TClonesArray * hc = (TClonesArray*)fhitscolmap.GetValue("S4"); |
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PamVMCDetectorHit * hit = 0; |
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if(hc){ |
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for(i=0;i<hc->GetEntriesFast();i++){ |
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hit = (PamVMCDetectorHit*)hc->At(i); |
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Ert += hit->GetEREL(); |
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NdF=Int_t(hit->GetEREL()/E1); |
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NdFT=0; |
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X=hit->GetXIN(); |
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Y=hit->GetYIN(); |
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Z=(Float_t)(random())/(Float_t)(0x7fffffff)-0.5; |
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for(j=0;j<NdF;j++){ |
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q=(Float_t)random()/(Float_t)0x7fffffff; |
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w=(Float_t)random()/(Float_t)0x7fffffff; |
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V[0]=p*cos(6.28318*q); |
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V[1]=p*sin(6.28318*q); |
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V[2]=p*(2.*w-1.); |
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pmt=0; |
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x=X; |
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y=Y; |
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z=Z; |
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while(pmt==0 && (x>Xs[0] && x<Xs[1])&&(y>Ys[0] && y<Ys[1])&&(z>Zs[0] && z<Zs[1])){ |
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l=0; |
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while(pmt==0 && (x>Xs[0] && x<Xs[1])&&(y>Ys[0] && y<Ys[1])&&(z>Zs[0] && z<Zs[1])){ |
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x+=V[0]; |
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y+=V[1]; |
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z+=V[2]; |
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l+=p; |
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} |
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if((x<Xs[0]+p || x>Xs[1]-p)&&(y>Ys[0]+p && y<Ys[1]-p)&&(z>Zs[0]+p && z<Zs[1]-p)){ |
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for(t=0;t<3;t++){ |
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if(y>=Yp[2*t] && y<Yp[2*t+1]){ |
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if(pmt==0)NdFT++; |
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pmt=1; |
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break; |
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} |
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} |
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if(pmt==1)break; |
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V[0]=-V[0]; |
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} |
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q=(Float_t)random()/(Float_t)0x7fffffff; |
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w=1-exp(-l/l0); |
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if(q<w)break; |
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q=(Float_t)random()/(Float_t)0x7fffffff; |
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w=0.5; |
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if(q<w)break; |
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if((x>Xs[0]+p && x<Xs[1]-p)&&(y<Ys[0]+p || y>Ys[1]-p)&&(z>Zs[0]+p && z<Zs[1]-p))V[1]=-V[1]; |
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if((x>Xs[0]+p && x<Xs[1]-p)&&(y>Ys[0]+p && y<Ys[1]-p)&&(z<Zs[0]+p || z>Zs[1]-p))V[2]=-V[2]; |
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x+=V[0]; |
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y+=V[1]; |
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z+=V[2]; |
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l=0; |
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} |
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} |
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} |
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Ert=Ert/0.002; |
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q=(Float_t)(random())/(Float_t)0x7fffffff; |
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w=0.7; |
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E0=4064./7.; |
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if(Ert<1) S4=0; |
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else S4=(Int_t)(4064.*(1.-exp(-(Ert-1.)/E0))); |
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i=S4/4; |
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if(S4%4==0) |
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S4v=S4+S4p; |
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else if(S4%4==1){ |
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if(q<w) S4v=S4-1+S4p; |
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else S4v=S4+1+S4p; |
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} else if(S4%4==2) S4v=S4+S4p; |
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else if(S4%4==3){ |
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if(q<w) S4v=S4+1+S4p; |
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else S4v=S4-1+S4p; |
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} |
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if (DEBUG) |
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cout<<"Ert_S4 = " << Ert << " --- S4v = " << S4v << endl; |
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fData.clear(); |
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fData.push_back(S4v); |
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fData.push_back(0xd800); |
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fData.push_back(0x0300); |
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} |
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} |
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