Geant4 Simulation with Version 11.2.1

Installing Geant4

CERN Geant4 Guide: See here for a walkthrough to install geant4.

Geometry Setup

The geometry for the Geant4 simulation is defined in /home/jlabdaq/CDetMC/src/DetectorConstruction.cc

General Construction

G4 GeometryManager
1. Opens the geometry and removes optimizations (optionally, related to just the specified logical-volume).

 G4GeometryManager::OpenGeometry(G4VPhysicalVolume* pVolume)

G4LogicalVolume
1. Constructor - sets member data and adds to logical Store, voxel pointer for optimization set to 0 by default.Initializes daughter vector to 0 length.

 G4LogicalVolume::G4LogicalVolume ( G4VSolid *              pSolid,
                                    G4Material *            pMaterial,
                              const G4String &        name,
                                    G4FieldManager *        pFieldMgr = 0,
                                    G4VSensitiveDetector *  pSDetector = 0,
                                    G4UserLimits *          pULimits = 0,
                                    G4bool                  optimise = true)

An example of the G4LogicalVolume constructor

G4LogicalSkinSurface
1. Constructor for skin surface of material

 G4LogicalSkinSurface::G4LogicalSkinSurface  ( const G4String &          name,
                                                     G4LogicalVolume *   vol,
                                                     G4SurfaceProperty * surfaceProperty)

An example of the G4LogicalSkinSurface constructor

G4PVPlacement
1. Constructor for the placement of the object

 G4PVPlacement::G4PVPlacement ( G4RotationMatrix *   pRot,
                          const G4ThreeVector &      tlate,
                                G4LogicalVolume *    pCurrentLogical,
                          const G4String &           pName,
                                G4LogicalVolume *    pMotherLogical,
                                G4bool               pMany,
                                G4int                pCopyNo,
                                G4bool               pSurfChk = false)

G4OpticalSurface
1. Constructor for a optical surface

 G4OpticalSurface::G4OpticalSurface ( const G4String &                name,
                                            G4OpticalSurfaceModel     model = glisur,
                                            G4OpticalSurfaceFinish    finish = polished,
                                            G4SurfaceType             type = dielectric_dielectric,
                                            G4double                  value = 1.0)

An example of one of the Optical Surface constructions in the DetectorConstruction.cc file

General Material Construction

G4Element
- Constructor to generate an element from scratch

 G4Element::G4Element   ( const G4String &   name,
                          const G4String &   symbol,
                                G4double     Zeff,
                                G4double     Aeff)

An example of the element creation used in the DetectorConstruction.cc file

G4Material
- Constructor to generate a material from scratch

 G4Material::G4Material  ( const G4String &    name,
                                 G4double      z,
                                 G4double      a,
                                 G4double      density,
                                 G4State       state = kStateUndefined,
                                 G4double      temp = CLHEP::STP_Temperature,
                                 G4double      pressure = CLHEP::STP_Pressure)

From the DetectorConstruction.cc file. Line 231 shows the creation of a new G4Material, while the lines below add elements to the newly created material.

G4Material (continued)
- Add element to a material

 void G4Material::AddElement  ( G4Element * element,
                                G4int       nAtoms)

G4Material (continued)
- Add property to a material

 G4MaterialPropertyVector * G4MaterialPropertiesTable::AddProperty ( const char *  	 key,
                                                                           G4double *    photonEnergies,
                                                                           G4double *    propertyValues,
                                                                           G4int         numEntries,
                                                                           G4bool        createNewKey = false,
                                                                           G4bool        spline = false)

An example usage of the AddProperty function in the DetectorConstruction.cc file

Scintillator

Light Guide

Phototube

a

An example of the Phototube construction in the DetectorConstruction.cc file

Graph Analysis

Found in /home/CDetMC/analysis/plots/

Graph Analysis of Tests
Plot Title	Description	Plot
C1	Position of incident muons in the x, y, and z coordinates, and the time of impacts. we guess ¯\_(ツ)_/¯
C2RA	The truth values used in the simulation. Primitive energy. The Theta and Phi angles when measured. The particle pdg value.	Placeholder
C3RA	The simulation results. Detector of hits on the scintillators. The measured mass of the particle is the interpreted PDG value. fingerID shows the event counts and which finger the events occur at. fingerED shows the energy deposited and how many times it occurred. fingerPMTID shows the PMTID's related to each scintillator and the number of incidents for each. Finger PMT Time shows the distribution of time values.	Placeholder
C4RA	Histograms for energy deposition and number of photo electrons	Placeholder
C7RA	Energy deposition vs number of photons	Placeholder
C8RA	Energy deposition vs number of photons	Placeholder
C12	Shows the momentum of particles in each of the directions.	Placeholder
C13	Event impact point distribution	Placeholder
C14	Recorded incident impact points in the x, y, and z directions.	Placeholder
C33RA	Angle of incident ± π/2	Placeholder