448 lines
16 KiB
C++
448 lines
16 KiB
C++
#include "TRandom.h" // ROOT random number generators, gRandom
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#include "TFile.h" // ROOT file I/O
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#include "TTree.h" // ROOT tree storage
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#include "TH1.h" // 1D histograms
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#include "TH2.h" // 2D histograms
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#include "TStyle.h" // ROOT plotting style controls
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#include "TCanvas.h" // ROOT canvas drawing
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#include "TBenchmark.h" // timing measurement
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#include "TGraph.h" // for energy loss interpolation
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#include <cstring>
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#include "TApplication.h" // ROOT app loop
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#include "ClassTransfer.h" // Reaction kinematics and MC event generation
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#include "ClassAnasen.h" // ANASEN detector model classes (SX3, PW, etc.)
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#include "TCanvas.h" // ROOT canvas for drawing
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//======== Generate light particle based on reaction
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// calculate real and reconstructed tracks and Q-value uncertainty
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// Function to load energy loss table from file
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TGraph* LoadELoss(const char* filename) {
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TGraph* g = new TGraph(filename, "%lg %lg");
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return g;
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}
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int main(int argc, char **argv){
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printf("=========================================\n");
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printf("=== ANASEN Monte Carlo ===\n");
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printf("=========================================\n");
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// number of events can be overridden from command line
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int numEvent = 1000000;
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if( argc >= 2 ) numEvent = atoi(argv[1]);
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// load energy loss tables (assume units: E in MeV, dE/dx in MeV/(mg/cm²), density in mg/cm³)
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TGraph* elossLight = LoadELoss("../ELoss/Eloss_HeAlpha"); // for light particle (alpha)
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TGraph* elossHeavy = LoadELoss("../ELoss/Eloss_p"); // for heavy particle (proton)
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double density = 0.0000861; // example for aluminum target, adjust as needed
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auto c1 = new TCanvas("c1", "Graph Example", 800, 600);
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auto g = elossLight;
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g->SetTitle("Energy Loss Table;Kinetic Energy (MeV);dE/dx (MeV/(mg/cm^{2}))");
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g->Draw("ALP");
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g->SetLineColor(kRed);
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c1->SetLogy();
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c1->SetLogx();
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c1->Print("eloss_light.png");
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auto g2 = elossHeavy;
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g2->SetTitle("Energy Loss Table;Kinetic Energy (MeV);dE/dx (MeV/(mg/cm^{2}))");
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g2->Draw("ALP");
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g2->SetLineColor(kBlue);
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c1->Print("eloss_heavy.png");
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// Reaction setup: projectile + target configuration, energy, and product IDs
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TransferReaction transfer;
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transfer.SetA(24,12, 0); // e.g., 24Mg (Z=12) with 0 excitation
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transfer.SetIncidentEnergyAngle(5.46, 0, 0); // 5.46 MeV beam, 0 polar and azimuthal angle
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transfer.Seta( 4, 2); // identify reaction product a in internal indexing e.g., 4He (alpha)
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transfer.Setb( 1, 1); // identify reaction product b e.g., 1H (proton)
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// TODO add alpha source or alternative reaction channel selection
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// Excited state lists (target and projectile/excited products)
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std::vector<float> ExAList = {0};
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std::vector<float> ExList = {0, 1, 2};
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// define vertex position uniform distribution ranges (mm)
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double vertexXRange[2] = { -5, 5}; // mm
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double vertexYRange[2] = { -5, 5};
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double vertexZRange[2] = { -100, 100};
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// detector resolution / uncertainty parameters
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double sigmaSX3_W = -1; // mm, if < 0 use mid-point (no spread in SX3 horizontal dimension)
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double sigmaSX3_L = 3; // mm, vertical spread for SX3
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double sigmaPW_A = 0; // normalized anode uncertainty term (0-1)
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double sigmaPW_C = 0; // normalized cathode uncertainty term (0-1)
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// status printout
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printf("------------ Vertex :\n");
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printf("X : %7.2f - %7.2f mm\n", vertexXRange[0], vertexXRange[1]);
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printf("Y : %7.2f - %7.2f mm\n", vertexYRange[0], vertexYRange[1]);
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printf("Z : %7.2f - %7.2f mm\n", vertexZRange[0], vertexZRange[1]);
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printf("------------ Uncertainty :\n");
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printf(" SX3 horizontal : %.1f\n", sigmaSX3_W);
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printf(" SX3 vertical : %.1f\n", sigmaSX3_L);
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printf(" Anode : %.1f mm\n", sigmaPW_A);
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printf(" Cathode : %.1f mm\n", sigmaPW_C);
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printf(" num_eve : %d \n",numEvent);
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// calculates energy/momentum/kinematics constants for transfer reaction
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transfer.CalReactionConstant();
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int nExA = ExAList.size();
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int nEx = ExList.size();
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// optional visualization control: pass "vis" as 3rd arg
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bool enableVis = (argc >= 3 && strcmp(argv[2], "vis") == 0);
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TApplication *app = nullptr;
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if(enableVis){
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app = new TApplication("anasenVis", &argc, argv);
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}
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// storage for tracks during simulation (for visualization)
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std::vector<TVector3> visTrackVertex, visTrackDir, visTrackHitPos;
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std::vector<std::pair<int,int>> visTrackWires; // {anodeID, cathodeID}
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// create detector representation in memory
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ANASEN * anasen = new ANASEN(); // top-level detector object
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SX3 * sx3 = anasen->GetSX3(); // silicon array part
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PW * pw = anasen->GetPW(); // proportional wire chamber part
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// output file + tree
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TString saveFileName = "SimAnasen1.root";
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printf("\e[32m#################################### building Tree in %s\e[0m\n", saveFileName.Data());
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TFile * saveFile = new TFile(saveFileName, "recreate");
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TTree * tree = new TTree("tree", "tree");
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// beam and CM variables saved in tree
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double KEA;
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tree->Branch("beamKEA", &KEA, "beamKEA/D");
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double thetaCM, phiCM;
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tree->Branch("thetaCM", &thetaCM, "thetaCM/D");
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tree->Branch("phiCM", &phiCM, "phiCM/D");
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// outgoing particles in lab frame (light/heavy)
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double thetab, phib, Tb;
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double thetaB, phiB, TB;
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tree->Branch("thetab", &thetab, "thetab/D");
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tree->Branch("phib", &phib, "phib/D");
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tree->Branch("Tb", &Tb, "Tb/D");
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tree->Branch("thetaB", &thetaB, "thetaB/D");
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tree->Branch("phiB", &phiB, "phiB/D");
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tree->Branch("TB", &TB, "TB/D");
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// excitation state identifiers
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int ExAID;
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double ExA;
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tree->Branch("ExAID", &ExAID, "ExAID/I");
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tree->Branch("ExA", &ExA, "ExA/D");
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int ExID;
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double Ex;
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tree->Branch("ExID", &ExID, "ExID/I");
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tree->Branch("Ex", &Ex, "Ex/D");
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// true vertex position in target volume
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double vertexX, vertexY, vertexZ;
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tree->Branch("vX", &vertexX, "VertexX/D");
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tree->Branch("vY", &vertexY, "VertexY/D");
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tree->Branch("vZ", &vertexZ, "VertexZ/D");
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// reconstructed SX3 hit position
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double sx3X, sx3Y, sx3Z;
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tree->Branch("sx3X", &sx3X, "sx3X/D");
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tree->Branch("sx3Y", &sx3Y, "sx3Y/D");
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tree->Branch("sx3Z", &sx3Z, "sx3Z/D");
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// PW nearest and next nearest wires
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int anodeID[2], cathodeID[2];
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tree->Branch("aID", anodeID, "anodeID/I");
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tree->Branch("cID", cathodeID, "cathodeID/I");
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// distances to nearest wires
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double anodeDist[2], cathodeDist[2];
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tree->Branch("aDist", anodeDist, "anodeDist/D");
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tree->Branch("cDist", cathodeDist, "cathodeDist/D");
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// SX3 channel assignment and Z fraction (depth) information
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int sx3ID, sx3Up, sx3Dn, sx3Bk;
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double sx3ZFrac;
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tree->Branch("sx3ID", &sx3ID, "sx3ID/I");
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tree->Branch("sx3Up", &sx3Up, "sx3Up/I");
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tree->Branch("sx3Dn", &sx3Dn, "sx3Dn/I");
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tree->Branch("sx3Bk", &sx3Bk, "sx3Bk/I");
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tree->Branch("sx3ZFrac", &sx3ZFrac, "sx3ZFrac/D");
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// reconstructed angles from PW track fit, method 1 and 2
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double reTheta, rePhi;
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tree->Branch("reTheta", &reTheta, "reconstucted_theta/D");
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tree->Branch("rePhi", &rePhi, "reconstucted_phi/D");
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double reTheta1, rePhi1;
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tree->Branch("reTheta1", &reTheta1, "reconstucted_theta1/D");
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tree->Branch("rePhi1", &rePhi1, "reconstucted_phi1/D");
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// reconstructed vertex Z from PW fit
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double z0;
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tree->Branch("z0", &z0, "reconstucted_Z/D");
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TTree* tree2 = tree->CloneTree(0);
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tree2->SetName("tree2");
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//========timer
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TBenchmark clock;
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bool shown ;
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clock.Reset();
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clock.Start("timer");
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shown = false;
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//================================= Calculate event loop
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for( int i = 0; i < numEvent ; i++){
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// randomly sample target/projectile excitations
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ExAID = gRandom->Integer(nExA);
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ExA = ExAList[ExAID];
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transfer.SetExA(ExA);
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ExID = gRandom->Integer(nEx);
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Ex = ExList[ExID];
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transfer.SetExB(Ex);
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// recalc kinematic constants for chosen states
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transfer.CalReactionConstant();
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// isotropic CM direction
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thetaCM = TMath::ACos(2 * gRandom->Rndm() - 1) ;
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phiCM = (gRandom->Rndm() - 0.5) * TMath::TwoPi();
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//==== Calculate reaction kinematics in lab frame
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TLorentzVector * output = transfer.Event(thetaCM, phiCM); // returns array of outputs
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TLorentzVector Pb = output[2]; // light particle or product A
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TLorentzVector PB = output[3]; // heavy particle or product B
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thetab = Pb.Theta() * TMath::RadToDeg();
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thetaB = PB.Theta() * TMath::RadToDeg();
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Tb = Pb.E() - Pb.M();
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TB = PB.E() - PB.M();
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phib = Pb.Phi() * TMath::RadToDeg();
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phiB = PB.Phi() * TMath::RadToDeg();
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// vertex position in target volume
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vertexX = (vertexXRange[1]- vertexXRange[0])*gRandom->Rndm() + vertexXRange[0];
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vertexY = (vertexYRange[1]- vertexYRange[0])*gRandom->Rndm() + vertexYRange[0];
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vertexZ = (vertexZRange[1]- vertexZRange[0])*gRandom->Rndm() + vertexZRange[0];
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TVector3 vertex(vertexX, vertexY, vertexZ);
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// set direction vector from lab angle
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TVector3 dir(1, 0, 0);
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dir.SetTheta(thetab * TMath::DegToRad());
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dir.SetPhi(phib * TMath::DegToRad());
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// run detector response models for PW and SX3
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pw->FindWireID(vertex, dir, false);
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sx3->FindSX3Pos(vertex, dir, false);
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PWHitInfo hitInfo = pw->GetHitInfo();
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// store nearest/next closest wire data
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anodeID[0] = hitInfo.nearestWire.first;
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cathodeID[0] = hitInfo.nearestWire.second;
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anodeID[1] = hitInfo.nextNearestWire.first;
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cathodeID[1] = hitInfo.nextNearestWire.second;
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anodeDist[0] = hitInfo.nearestDist.first;
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cathodeDist[0] = hitInfo.nearestDist.second;
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anodeDist[1] = hitInfo.nextNearestDist.first;
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cathodeDist[1] = hitInfo.nextNearestDist.second;
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// SX3 hit channel info and depth fraction
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sx3ID = sx3->GetID();
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if( sx3ID >= 0 ){
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sx3Up = sx3->GetChUp();
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sx3Dn = sx3->GetChDn();
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sx3Bk = sx3->GetChBk();
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sx3ZFrac = sx3->GetZFrac();
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// apply intrinsic detector resolution to true SX3 hit position
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// for no smearing comment out and use GetHitPos();
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TVector3 hitPos = sx3->GetHitPosWithSigma(sigmaSX3_W, sigmaSX3_L);
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sx3X = hitPos.X();
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sx3Y = hitPos.Y();
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sx3Z = hitPos.Z();
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// store track data for visualization if enabled
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if(enableVis){
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visTrackVertex.push_back(vertex);
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visTrackDir.push_back(dir);
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visTrackHitPos.push_back(hitPos);
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visTrackWires.push_back({anodeID[0], cathodeID[0]});
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}
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// reconstruct track from PW readings + SX3 hit
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pw->CalTrack(hitPos, anodeID[0], cathodeID[0], false);
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reTheta = pw->GetTrackTheta() * TMath::RadToDeg();
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rePhi = pw->GetTrackPhi() * TMath::RadToDeg();
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// alternative track algorithm with uncertainty parameters
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pw->CalTrack2(hitPos, hitInfo, sigmaPW_A, sigmaPW_C, false);
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reTheta1 = pw->GetTrackTheta() * TMath::RadToDeg();
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rePhi1 = pw->GetTrackPhi() * TMath::RadToDeg();
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z0 = pw->GetZ0();
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tree->Fill();
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//Energy loss
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double dl = (hitPos - vertex).Mag() / 10; // path length in cm (positions in mm)
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//double EkinLight = Pb.E() - Pb.M();// kinetic energy of light particle before loss
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//double dedxLight = elossLight->Eval(EkinLight); // interpolate dE/dx
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if (numEvent <= 10){
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printf("Event %d: Ekin before loss = %f MeV, distance = %f cm\n", i, Tb, dl);
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}
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double tb_temp = Tb;
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//double dE_light = dedxLight * dl * density / 1000.0; // adjust for units (example scaling)
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double dx = 0;
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double counter = 0;
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while(dx < dl){
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double step = 0.01; // cm, step size for energy loss calculation
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if(dx + step > dl) step = dl - dx; // adjust last step to end at hit position
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double EkinStep = Tb; // kinetic energy at current step
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double dedxStep = elossLight->Eval(EkinStep); // dE/dx at current energy
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double dE_step = dedxStep * step * density; // energy loss for this step
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if (numEvent <= 10 && fmod(counter, 10) == 0){
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printf("Event %d: step = %f, Ekin = %f MeV, dE/dx = %f MeV/(g/cm^2), dE_step = %f MeV\n", i, counter, EkinStep, dedxStep, dE_step);
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}
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Pb.SetE(Pb.E() - dE_step); // update energy after loss for this step
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dx += step;
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counter++;
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Tb = Tb - dE_step; // update kinetic energy for tree storage
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}
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// fill tree2 with energy loss adjusted data
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tree2->Fill();
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if (numEvent <= 10){
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printf("Event %d: Tb after energy loss = %f MeV, energy loss = %f MeV\n", i, Tb, tb_temp - Tb);
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}
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}else{
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// no valid SX3 hit: mark clearly invalid
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sx3Up = -1;
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sx3Dn = -1;
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sx3Bk = -1;
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sx3ZFrac = TMath::QuietNaN();
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sx3X = TMath::QuietNaN();
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sx3Y = TMath::QuietNaN();
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sx3Z = TMath::QuietNaN();
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reTheta = TMath::QuietNaN();
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rePhi = TMath::QuietNaN();
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reTheta1 = TMath::QuietNaN();
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rePhi1 = TMath::QuietNaN();
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z0 = TMath::QuietNaN();
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// fill tree with original data (no energy loss for these events)
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//tree->Fill();
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//tree2->Fill();
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}
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//#################################################################### Timer
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// measure elapsed real time and print progress roughly every 10 sec
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clock.Stop("timer");
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Double_t time = clock.GetRealTime("timer");
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clock.Start("timer");
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if ( !shown ) {
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if (fmod(time, 10) < 1 ){
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printf( "%10d[%2d%%]| %8.2f sec | expect: %5.1f min \n", i, TMath::Nint((i+1)*100./numEvent), time , numEvent*time/(i+1)/60);
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shown = 1;
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}
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} else {
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if (fmod(time, 10) > 9 ){
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shown = 0;
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}
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}
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}
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// write results to ROOT file and close
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//tree->Write();
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//tree2->Write();
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tree->Write("", TObject::kOverwrite);
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tree2->Write("", TObject::kOverwrite);
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int count = tree->GetEntries();
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int count2 = tree2->GetEntries();
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saveFile->Close();
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printf("=============== done. saved as %s. tree entries: %d, tree2 entries: %d\n", saveFileName.Data(), count, count2);
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if(enableVis){
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printf("Displaying geometry with %zu tracks from simulation\n", visTrackVertex.size());
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// Build full geometry with all wires
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anasen->DrawAnasen(0, 23, 0, 23, -1, true);
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// Add all stored tracks to the geometry
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TGeoManager *geom = anasen->GetGeoManager();
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TGeoVolume *worldBox = anasen->GetWorldBox();
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if(geom && worldBox && visTrackVertex.size() > 0){
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int trackNodeID = 500; // start node IDs for tracks
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for(size_t iTrack = 0; iTrack < visTrackVertex.size(); ++iTrack){
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TVector3 vertex = visTrackVertex[iTrack];
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TVector3 dir = visTrackDir[iTrack];
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TVector3 hitPos = visTrackHitPos[iTrack];
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double theta = dir.Theta() * TMath::RadToDeg();
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double phi = dir.Phi() * TMath::RadToDeg();
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// Add a line marker at the vertex
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TGeoVolume *startMarker = geom->MakeSphere("startMarker", 0, 0, 2.0);
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startMarker->SetLineColor(kBlack);
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worldBox->AddNode(startMarker, trackNodeID,
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new TGeoCombiTrans(vertex.X(), vertex.Y(), vertex.Z(),
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new TGeoRotation("rot", 0, 0, 0)));
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trackNodeID++;
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// Add track line from vertex toward hit position
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TGeoVolume *trackLine = geom->MakeTube("trackLine", 0, 0, 0.08, 150.0);
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trackLine->SetLineColor(kBlue);
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worldBox->AddNode(trackLine, trackNodeID,
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new TGeoCombiTrans(vertex.X(), vertex.Y(), vertex.Z(),
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new TGeoRotation("rotTrack", phi + 90, theta, 0)));
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trackNodeID++;
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// Add hit position marker
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TGeoVolume *hitMarker = geom->MakeSphere("hitMarker", 0, 0, 2.0);
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hitMarker->SetLineColor(kRed);
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worldBox->AddNode(hitMarker, trackNodeID,
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new TGeoCombiTrans(hitPos.X(), hitPos.Y(), hitPos.Z(),
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new TGeoRotation("rotHit", 0, 0, 0)));
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trackNodeID++;
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}
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// Redraw geometry with all tracks
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geom->CloseGeometry();
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geom->SetVisLevel(4);
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worldBox->Draw("ogle");
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}
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if(app){
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app->Run();
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}
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}
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delete anasen;
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delete elossLight;
|
|
delete elossHeavy;
|
|
|
|
|
|
return 0;
|
|
|
|
}
|