Gabriele Cosmo
107 lines
4.0 KiB
Plaintext
107 lines
4.0 KiB
Plaintext
$Id: README,v 1.5 2003/10/31 12:08:50 vnivanch Exp $
|
|
-------------------------------------------------------------------
|
|
|
|
=========================================================
|
|
Geant4 - an Object-Oriented Toolkit for Simulation in HEP
|
|
=========================================================
|
|
|
|
TestEm9
|
|
-------
|
|
This test is intended to test cut-per-region approach and to demonstrate
|
|
electromagnetic physics in crystal calorimeter
|
|
|
|
1- GEOMETRY DEFINITION
|
|
|
|
The geometry consists of the vertex detector (VD), the electromagnetic
|
|
calorimeter (EM), and the muon identifier (MU). Detector layout along
|
|
the axis Z.
|
|
|
|
VD consisted of 3 layers of Si with pads structured along the axis X.
|
|
Between VD and EM there are 2 active absorbers (scintillators).
|
|
EM is the matrix 5x5 of heavy crystals. MU consist of 2 active absorbers
|
|
(scintillators) and the iron plate between.
|
|
|
|
2 additional to the World regions are defined: VertexDetector and
|
|
MuonDetector. For testing purposes first absorber of MU is included in
|
|
the region of VD.
|
|
|
|
Material of calorimiter and absorber can be choosen:
|
|
Air Water lAr Al Fe BGO PbWO4 Pb.
|
|
eg: /testem/det/CalMat PbWO4
|
|
/testem/det/AbsMat Al
|
|
|
|
The size of the detector can be changed also.
|
|
|
|
eg: /testem/det/EcalLength 20 cm
|
|
/testem/det/EcalWidth 5 cm
|
|
/testem/det/update ---> rebuild the geometry
|
|
|
|
2- PHYSICS LISTS
|
|
|
|
Physics Lists are subdivided on 4 following modules:
|
|
1. "particles" - particle definitions
|
|
2. "general" - decays and transportation
|
|
3. "standard" (alternative) - standard EM physics
|
|
4. "g4v52" (alternative) - standard EM physics Geant4 5.2
|
|
5. "binary" (optional) - binary cascade for protons and neutrons with
|
|
energy below 3 GeV
|
|
6. "elastic" (optional) - elastic scattering of hadrons
|
|
|
|
3- AN EVENT : THE PRIMARY GENERATOR
|
|
|
|
The primary kinematic consists of a single particle which hits the
|
|
cylinder perpendicular to the input face. The type of the particle
|
|
and its energy are set in the PrimaryGeneratorAction class, and can
|
|
changed via the G4 build-in commands of ParticleGun class.
|
|
|
|
4- OUTPUT
|
|
|
|
The batch regime of simulation can be started
|
|
$G4WORKDIR/bin/$G4SYSTEM/TestEm9 TestEm9.in
|
|
where TestEm9.in is the example of macro file for batch job.
|
|
|
|
As a result of simulation the number of secondaries produced
|
|
in different regions are averaged. The average energy depositions
|
|
in active absorbers and EM as well as RMS of these values are shown.
|
|
The number of hits in pads of VD is printed out.
|
|
|
|
5- VISUALISATION
|
|
|
|
To use visualisation the environment variable G4_VIS_USE should be
|
|
defined. An interactive session starts if no macro file is specified
|
|
in the command line:
|
|
$G4WORKDIR/bin/$G4SYSTEM/TestEm9
|
|
|
|
To start visualisation one can issur
|
|
>/control/execute vis.mac
|
|
>/run/beamOn 1
|
|
|
|
6- ANALYSIS
|
|
|
|
To create histograms/ntuple for further analysis one should define
|
|
environment variable G4ANALYSIS_USE and setup local AIDA implementation.
|
|
The example should be recompiled:
|
|
|
|
gmake analclean
|
|
gmake
|
|
|
|
The macro file csi.mac can be used as exmple of macro for analysis. It
|
|
can be executed in the following way:
|
|
$G4WORKDIR/bin/$G4SYSTEM/TestEm9 csi.mac
|
|
|
|
7- Using the Anaphe implementation of the AIDA 3.0 histograms:
|
|
|
|
|
|
In order to use the Anaphe implementation of the AIDA 3.0 interfaces,
|
|
the 'aida-config' command (which is used in the GNUmakefile) is
|
|
available at:
|
|
/afs/cern.ch/sw/lhcxx/share/LHCXX/latest/scripts/aida-config
|
|
|
|
In order to run the executable, you need to source the following
|
|
script (once):
|
|
$HOME/bin/setupAnaphe.csh (or $HOME/bin/setupAnaphe)
|
|
|
|
At cern 'setupAnaphe' is available at:
|
|
/afs/cern.ch/sw/lhcxx/share/LHCXX/latest/scripts/setupAnaphe.csh
|
|
(or /afs/cern.ch/sw/lhcxx/share/LHCXX/latest/scripts/setupAnaphe)
|