// ===== Make the volume for the vacuum inside the beam pipe ============== TGeoVolume* MakeVacuum(Int_t iPart, Int_t nSects, Double_t* z, Double_t* rin, Double_t* rout, TGeoMedium* medium, fstream* infoFile) { // ---> Shape TGeoPcon* shape = new TGeoPcon(0., 360., nSects); for (Int_t iSect = 0; iSect < nSects; iSect++) { shape->DefineSection(iSect, z[iSect]/10., rin[iSect]/10., rout[iSect]/10.); // mm->cm } // ---> Volume TString volName = Form("pipevac%i", iPart); TGeoVolume* pipevac = new TGeoVolume(volName.Data(), shape, medium); return pipevac; }
// ===== Make the beam pipe volume ========================================= TGeoPcon* MakeShape(Int_t nSects, char* name, Double_t* z, Double_t* rin, Double_t* rout, fstream* infoFile) { // ---> Shape TGeoPcon* shape = new TGeoPcon(name, 0., 360., nSects); for (Int_t iSect = 0; iSect < nSects; iSect++) { shape->DefineSection(iSect, z[iSect]/10., rin[iSect]/10., rout[iSect]/10.); // mm->cm *infoFile << setw(2) << iSect+1 << setw(10) << fixed << setprecision(2) << z[iSect] << setw(10) << fixed << setprecision(2) << rin[iSect] << setw(10) << fixed << setprecision(2) << rout[iSect] << setw(10) << fixed << setprecision(2) << rout[iSect]-rin[iSect] << endl; } return shape; }
// ===== Make the beam pipe volume ========================================= TGeoVolume* MakePipe(Int_t iPart, Int_t nSects, Double_t* z, Double_t* rin, Double_t* rout, TGeoMedium* medium, fstream* infoFile) { // ---> Shape TGeoPcon* shape = new TGeoPcon(0., 360., nSects); for (Int_t iSect = 0; iSect < nSects; iSect++) { shape->DefineSection(iSect, z[iSect]/10., rin[iSect]/10., rout[iSect]/10.); // mm->cm *infoFile << setw(2) << iSect+1 << setw(10) << fixed << setprecision(2) << z[iSect] << setw(10) << fixed << setprecision(2) << rin[iSect] << setw(10) << fixed << setprecision(2) << rout[iSect] << setw(10) << fixed << setprecision(2) << rout[iSect]-rin[iSect] << endl; } // ---> Volume TString volName = Form("pipe%i", iPart); TGeoVolume* pipe = new TGeoVolume(volName.Data(), shape, medium); return pipe; }
int main(int argc, char * argv[]) { TApplication app("app", &argc, argv); plottingEngine.SetDefaultStyle(); const bool debug = true; // Load the field map. ComponentAnsys123* fm = new ComponentAnsys123(); const std::string efile = "ELIST.lis"; const std::string nfile = "NLIST.lis"; const std::string mfile = "MPLIST.lis"; const std::string sfile = "PRNSOL.lis"; fm->Initialise(efile, nfile, mfile, sfile, "mm"); fm->EnableMirrorPeriodicityX(); fm->EnableMirrorPeriodicityY(); fm->PrintRange(); // Dimensions of the GEM const double pitch = 0.014; const double kapton = 50.e-4; const double metal = 5.e-4; const double outdia = 70.e-4; const double middia = 50.e-4; const bool plotField = false; if (plotField) { ViewField* fieldView = new ViewField(); fieldView->SetComponent(fm); fieldView->SetPlane(0., -1., 0., 0., 0., 0.); fieldView->SetArea(-pitch / 2., -0.02, pitch / 2., 0.02); fieldView->SetVoltageRange(-160., 160.); TCanvas* cF = new TCanvas(); fieldView->SetCanvas(cF); fieldView->PlotContour(); } // Setup the gas. MediumMagboltz* gas = new MediumMagboltz(); gas->SetComposition("ar", 70., "co2", 30.); gas->SetTemperature(293.15); gas->SetPressure(760.); gas->EnableDebugging(); gas->Initialise(); gas->DisableDebugging(); // Set the Penning transfer efficiency. const double rPenning = 0.57; const double lambdaPenning = 0.; gas->EnablePenningTransfer(rPenning, lambdaPenning, "ar"); // Load the ion mobilities. gas->LoadIonMobility("IonMobility_Ar+_Ar.txt"); // Associate the gas with the corresponding field map material. const int nMaterials = fm->GetNumberOfMaterials(); for (int i = 0; i < nMaterials; ++i) { const double eps = fm->GetPermittivity(i); if (fabs(eps - 1.) < 1.e-3) fm->SetMedium(i, gas); } fm->PrintMaterials(); // Create the sensor. Sensor* sensor = new Sensor(); sensor->AddComponent(fm); sensor->SetArea(-5 * pitch, -5 * pitch, -0.03, 5 * pitch, 5 * pitch, 0.03); AvalancheMicroscopic* aval = new AvalancheMicroscopic(); aval->SetSensor(sensor); AvalancheMC* drift = new AvalancheMC(); drift->SetSensor(sensor); drift->SetDistanceSteps(2.e-4); const bool plotDrift = true; ViewDrift* driftView = new ViewDrift(); if (plotDrift) { driftView->SetArea(-2 * pitch, -2 * pitch, -0.02, 2 * pitch, 2 * pitch, 0.02); // Plot every 10 collisions (in microscopic tracking). aval->SetCollisionSteps(10); aval->EnablePlotting(driftView); drift->EnablePlotting(driftView); } // Histograms int nBinsGain = 100; double gmin = 0.; double gmax = 100.; TH1F* hElectrons = new TH1F("hElectrons", "Number of electrons", nBinsGain, gmin, gmax); TH1F* hIons = new TH1F("hIons", "Number of ions", nBinsGain, gmin, gmax); int nBinsChrg = 100; TH1F* hChrgE = new TH1F("hChrgE", "Electrons on plastic", nBinsChrg, -0.5e4 * kapton, 0.5e4 * kapton); TH1F* hChrgI = new TH1F("hChrgI", "Ions on plastic", nBinsChrg, -0.5e4 * kapton, 0.5e4 * kapton); double sumIonsTotal = 0.; double sumIonsDrift = 0.; double sumIonsPlastic = 0.; double sumElectronsTotal = 0.; double sumElectronsPlastic = 0.; double sumElectronsUpperMetal = 0.; double sumElectronsLowerMetal = 0.; double sumElectronsTransfer = 0.; double sumElectronsOther = 0.; const int nEvents = 10; for (int i = nEvents; i--;) { if (debug || i % 10 == 0) std::cout << i << "/" << nEvents << "\n"; // Randomize the initial position. const double smear = pitch / 2.; double x0 = -smear + RndmUniform() * smear; double y0 = -smear + RndmUniform() * smear; double z0 = 0.025; double t0 = 0.; double e0 = 0.1; aval->AvalancheElectron(x0, y0, z0, t0, e0, 0., 0., 0.); int ne = 0, ni = 0; aval->GetAvalancheSize(ne, ni); hElectrons->Fill(ne); hIons->Fill(ni); const int np = aval->GetNumberOfElectronEndpoints(); double xe1, ye1, ze1, te1, e1; double xe2, ye2, ze2, te2, e2; double xi1, yi1, zi1, ti1; double xi2, yi2, zi2, ti2; int status; for (int j = np; j--;) { aval->GetElectronEndpoint(j, xe1, ye1, ze1, te1, e1, xe2, ye2, ze2, te2, e2, status); sumElectronsTotal += 1.; if (ze2 > -kapton / 2. && ze2 < kapton / 2.) { hChrgE->Fill(ze2 * 1.e4); sumElectronsPlastic += 1.; } else if (ze2 >= kapton / 2. && ze2 <= kapton / 2. + metal) { sumElectronsUpperMetal += 1.; } else if (ze2 <= -kapton / 2. && ze2 >= -kapton / 2. - metal) { sumElectronsLowerMetal += 1.; } else if (ze2 < -kapton / 2. - metal) { sumElectronsTransfer += 1.; } else { sumElectronsOther += 1.; } drift->DriftIon(xe1, ye1, ze1, te1); drift->GetIonEndpoint(0, xi1, yi1, zi1, ti1, xi2, yi2, zi2, ti2, status); if (zi1 < 0.01) { sumIonsTotal += 1.; if (zi2 > 0.01) sumIonsDrift += 1.; } if (zi2 > -kapton / 2. && zi2 < kapton / 2.) { hChrgI->Fill(zi2 * 1.e4); sumIonsPlastic += 1.; } } } double fFeedback = 0.; if (sumIonsTotal > 0.) fFeedback = sumIonsDrift / sumIonsTotal; std::cout << "Fraction of ions drifting back: " << fFeedback << "\n"; const double neMean = hElectrons->GetMean(); std::cout << "Mean number of electrons: " << neMean << "\n"; const double niMean = hIons->GetMean(); std::cout << "Mean number of ions: " << niMean << "\n"; std::cout << "Mean number of electrons on plastic: " << sumElectronsPlastic / nEvents << "\n"; std::cout << "Mean number of ions on plastic: " << sumIonsPlastic / nEvents << "\n"; std::cout << "Electron endpoints:\n"; const double fUpperMetal = sumElectronsUpperMetal / sumElectronsTotal; const double fPlastic = sumElectronsPlastic / sumElectronsTotal; const double fLowerMetal = sumElectronsLowerMetal / sumElectronsTotal; const double fTransfer = sumElectronsTransfer / sumElectronsTotal; const double fOther = sumElectronsOther / sumElectronsTotal; std::cout << " upper metal: " << fUpperMetal * 100. << "%\n"; std::cout << " plastic: " << fPlastic * 100. << "%\n"; std::cout << " lower metal: " << fLowerMetal * 100. << "%\n"; std::cout << " transfer: " << fTransfer * 100. << "%\n"; std::cout << " other: " << fOther * 100. << "%\n"; TCanvas* cD = new TCanvas(); const bool plotGeo = true; if (plotGeo && plotDrift) { // Build the geometry in Root. TGeoManager* geoman = new TGeoManager("world", "geometry"); TGeoMaterial* matVacuum = new TGeoMaterial("Vacuum", 0, 0, 0); TGeoMedium* medVacuum = new TGeoMedium("Vacuum", 1, matVacuum); TGeoMaterial* matKapton = new TGeoMaterial("Kapton", 12, 6, 1.42); TGeoMedium* medKapton = new TGeoMedium("Kapton", 2, matKapton); TGeoMaterial* matCopper = new TGeoMaterial("Copper", 63, 29, 8.94); TGeoMedium* medCopper = new TGeoMedium("Copper", 3, matCopper); TGeoVolume* volTop = geoman->MakeBox("TOP", medVacuum, pitch, pitch, 0.02); volTop->SetVisibility(0); TGeoBBox* shpKapton = new TGeoBBox("K", pitch / 2., pitch / 2., kapton / 2.); TGeoPcon* shpHole = new TGeoPcon("H", 0., 360., 3); shpHole->DefineSection(0, -kapton / 2., 0., outdia / 2.); shpHole->DefineSection(1, 0., 0., middia / 2.); shpHole->DefineSection(2, kapton / 2., 0., outdia / 2.); TGeoCompositeShape* shpGem = new TGeoCompositeShape("G", "K - H"); TGeoVolume* volKapton = new TGeoVolume("Kapton", shpGem, medKapton); volKapton->SetLineColor(kGreen); volKapton->SetTransparency(50); TGeoBBox* shpMetal = new TGeoBBox("M", pitch / 2., pitch / 2., metal / 2.); TGeoTube* shpTube = new TGeoTube("T", 0., outdia / 2., metal / 2.); TGeoCompositeShape* shpElectrode = new TGeoCompositeShape("E", "M - T"); TGeoVolume* volElectrode = new TGeoVolume("Electrode", shpElectrode, medCopper); volElectrode->SetLineColor(kBlue); volElectrode->SetTransparency(50); TGeoVolumeAssembly* volGem = new TGeoVolumeAssembly("Gem"); const double shift = 0.5 * (metal + kapton); volGem->AddNode(volKapton, 1); volGem->AddNode(volElectrode, 2, new TGeoTranslation(0., 0., shift)); volGem->AddNode(volElectrode, 3, new TGeoTranslation(0., 0., -shift)); volTop->AddNode(volGem, 1); volTop->AddNode(volGem, 2, new TGeoTranslation(-pitch, 0., 0.)); volTop->AddNode(volGem, 3, new TGeoTranslation(+pitch, 0., 0.)); volTop->AddNode(volGem, 4, new TGeoTranslation(-pitch / 2., sqrt(3) * pitch / 2., 0.)); volTop->AddNode(volGem, 5, new TGeoTranslation(+pitch / 2., sqrt(3) * pitch / 2., 0.)); volTop->AddNode(volGem, 6, new TGeoTranslation(-pitch / 2., -sqrt(3) * pitch / 2., 0.)); volTop->AddNode(volGem, 7, new TGeoTranslation(+pitch / 2., -sqrt(3) * pitch / 2., 0.)); geoman->SetVerboseLevel(0); geoman->SetTopVolume(volTop); geoman->CloseGeometry(); geoman->CheckOverlaps(0.1e-4); geoman->SetNmeshPoints(100000); cD->cd(); geoman->GetTopVolume()->Draw("ogl"); } if (plotDrift) { driftView->SetCanvas(cD); driftView->Plot(); } const bool plotHistogram = true; if (plotHistogram) { TCanvas* cH = new TCanvas("cH", "Histograms", 800, 700); cH->Divide(2, 2); cH->cd(1); hElectrons->Draw(); cH->cd(2); hIons->Draw(); cH->cd(3); hChrgE->Draw(); cH->cd(4); hChrgI->Draw(); } app.Run(kTRUE); }