144 lines
4.9 KiB
C++
144 lines
4.9 KiB
C++
/***********************************************************************
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*
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* This is FindThetaCM.h, To calculate the thetaCM convrage for each detector
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*
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* This required two inout files: basicReactionConfig.txt
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* detectorGeo.txt
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*
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*-------------------------------------------------------
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* created by Ryan (Tsz Leung) Tang, Nov-18, 2018
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* email: goluckyryan@gmail.com
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* ********************************************************************/
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#include "TFile.h"
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#include "TTree.h"
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#include "TF1.h"
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#include "TMacro.h"
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#include "TObjArray.h"
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#include "TGraph.h"
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#include "../Cleopatra/ClassHelios.h"
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#include "../Cleopatra/ClassTransfer.h"
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void FindThetaCM(double Ex, int nDivision=1, double XRATION = 0.95,
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std::string reactionConfigFileName="reactionConfig.txt",
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std::string detGeoFileName = "detectorGeo.txt", unsigned short ID = 0){
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///========================================================= load files
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TransferReaction reaction(reactionConfigFileName, ID);
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reaction.SetExB(Ex);
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reaction.CalReactionConstant();
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reaction.PrintReaction(false);
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ReactionConfig reConfig = reaction.GetRectionConfig();
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Recoil recoil = reaction.GetRecoil();
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HELIOS helios(detGeoFileName, ID);
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helios.PrintGeometry();
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DetGeo detGeo = helios.GetDetectorGeometry();
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Array array = helios.GetArrayGeometry();
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//calculate a TGraph for thetaCM vs z
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const int nData = 170;
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double px[nData];
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double py[nData];
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double mb = reaction.GetMass_b();
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double kCM = reaction.GetMomentumbCM();
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double q = TMath::Sqrt(mb*mb + kCM * kCM );
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double beta = reaction.GetReactionBeta() ;
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double BField = detGeo.Bfield;
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double slope = reaction.GetEZSlope(BField);
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double gamma = reaction.GetReactionGamma();
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double perpDist = array.detPerpDist;
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for(int i = 0; i < nData; i++){
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double thetacm = (i + 5.) * TMath::DegToRad();
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double temp = TMath::TwoPi() * slope / beta / kCM * perpDist / TMath::Sin(thetacm);
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px[i] = beta /slope * (gamma * beta * q - gamma * kCM * TMath::Cos(thetacm)) * (1 - TMath::ASin(temp)/TMath::TwoPi());
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py[i] = thetacm * TMath::RadToDeg();
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}
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//find minimum z position
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TGraph * xt = new TGraph(100, py, px);
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xt->SetName("xt");
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///double zMin0 = xt->Eval(0);
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///printf("z for thetaCM = 0 : %f mm \n", zMin0);
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///xt->Draw("AC*");
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/// find the minimum z position and the corresponding theta
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double zMin0 = 99999999;
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double tMin0 = 99999999;
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for( double ttt = 3 ; ttt < 20 ; ttt += 0.1 ){
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double zzz = xt->Eval(ttt);
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if( zzz < zMin0 ) {
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zMin0 = zzz;
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tMin0 = ttt;
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}
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}
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printf(" z min %f mm at thetaCM %f deg \n", zMin0, tMin0);
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TGraph * tx = new TGraph(nData, px, py);
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tx->SetName(Form("tx"));
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tx->SetLineColor(4);
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//Remove nan data
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for( int i = tx->GetN() -1 ; i >= 0 ; i--){
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if( TMath::IsNaN(tx->GetPointX(i)) ) tx->RemovePoint(i);
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}
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// tx->Draw("AC");
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///========================================================= result
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int iDet = array.nDet;
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double length = array.detLength;
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std::vector<double> midPos;
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for(int i = 0; i < iDet; i++){
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if( array.firstPos > 0 ){
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midPos.push_back(array.detPos[i]+length/2.);
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}else{
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midPos.push_back(array.detPos[i]-length/2.);
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}
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// printf("%2d | %f \n", i, midPos.back());
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}
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printf("==== ThetaCM in degree =================\n");
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printf(" x-ratio : %f, number of division : %d \n", XRATION, nDivision);
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printf("\n");
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for( int j = 0; j < nDivision + 1; j++) printf("%5.2f ", -XRATION + 2*XRATION/nDivision*j);
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printf(" <<-- in X \n");
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for( int j = 0; j < nDivision + 1; j++) printf("%5s ", " | ");
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printf("\n");
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for( int j = 0; j < nDivision + 1; j++) printf("%5.2f ", length/2 -length*XRATION/2 + length*XRATION/nDivision*j);
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printf(" <<-- in mm \n\n");
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printf("========================= Ex : %6.4f MeV\n", Ex);
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printf(" %6s - %6s | %6s, %6s, %6s\n", "Min", "Max", "Mean", "Dt", "sin(x)dx * 180/pi");
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printf("-------------------------------------------------\n");
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for( int i = 0; i < iDet; i++){
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double zMin = midPos[i]-length*XRATION/2.;
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double zMax = midPos[i]+length*XRATION/2.;
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double zLength = zMax - zMin;
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double zStep = zLength/(nDivision);
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for( int j = 0 ; j < nDivision ; j++){
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double tMin = (zMin + j*zStep > zMin0) ? tx->Eval(zMin + j*zStep) : TMath::QuietNaN();
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double tMax = (zMin + (j+1)*zStep > zMin0) ? tx->Eval(zMin + (j+1)*zStep) : TMath::QuietNaN();
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double tMean = (tMax + tMin)/2.;
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double dt = (tMax - tMin);
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double sintdt = TMath::Sin(tMean * TMath::DegToRad()) * dt ;
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printf(" det-%d[%d]: %6.2f - %6.2f | %6.2f, %6.2f, %6.4f\n", i, j, tMin, tMax, tMean, dt, sintdt);
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}
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if( nDivision > 0 ) printf("--------------\n");
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}
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printf("================================================= \n");
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}
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