Import Geant4 11.0.0 source tree
This commit is contained in:
Gabriele Cosmo
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///\file "parameterisations/Par02/.README.txt"
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///\brief Example Par02 README page
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/*! \page ExamplePar02 Example Par02
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This example is a simplified version of a Geant4-based fast simulation
|
||||
program written by Anna Zaborowska for Future Circular Collider (FCC)
|
||||
studies.
|
||||
|
||||
This example shows how to do "track and energy smearing" in Geant4,
|
||||
in order to have a very fast simulation based on assumed detector
|
||||
resolutions.
|
||||
|
||||
The geometry which is considered is a simplified collider detector set-up,
|
||||
inspired by ALEPH/ATLAS/CMS detectors. Although it is much simpler than
|
||||
a realistic detector, it is anyhow fairly complex and therefore build up
|
||||
from a GDML file, Par02FullDetector.gdml .
|
||||
|
||||
In this example:
|
||||
- Particles with transverse momentum less than 1 MeV or pseudorapidity
|
||||
larger (in module) than 5.5 are neglected (i.e. the corresponding
|
||||
Geant4 track is killed as soon as it is created).
|
||||
- Any primary charged particle is smeared in the tracker as follows:
|
||||
its momentum is smeared according to a gaussian, with mean equal to 1.0
|
||||
and sigma taken from the momentum resolution of the CMS tracker
|
||||
(with ALEPH or ATLAS tracker as a possible alternative), and then placed
|
||||
at the end of the tracker, at the position that it would reach if
|
||||
normally transported (i.e. without smearing).
|
||||
- Any primary electron, or positron, or gamma is smeared in the
|
||||
electromagnetic calorimeter as follows: it is killed at the entrance
|
||||
of the electromagnetic calorimeter, with a deposited energy equal to
|
||||
the gaussian smearing (with mean equal to 1.0 and sigma taken from the
|
||||
energy resolution of the CMS electromagnetic calorimeter - with ALEPH or
|
||||
ATLAS electromagnetic calorimeter as a possible alternative) of its
|
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kinetic energy (at the entrance of the electromagnetic calorimeter).
|
||||
- Any primary hadron is smeared in the hadronic calorimeter as follows:
|
||||
it is killed at the entrance of the hadronic calorimeter, with a
|
||||
deposited energy equal to the gaussian smearing (with mean equal to 1.0
|
||||
and sigma taken from the energy resolution of the CMS hadronic
|
||||
calorimeter - with ALEPH or ATLAS hadronic calorimeter as a possible
|
||||
alternative) of its kinetic energy (at the entrance of the hadronic
|
||||
calorimeter).
|
||||
- The only competing physical processes with respect to the above physics
|
||||
parametrisations are the decays.
|
||||
Note: no electromagnetic processes;
|
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no momentum smearing in the tracker for secondary particles;
|
||||
secondary electrons, positrons, gammas in the electromagnetic
|
||||
calorimeter are killed (at the entrance) but without any
|
||||
energy deposition;
|
||||
secondary hadrons in the hadronic calorimeter are killed (at the
|
||||
entrance) but without any energy deposition.
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Below some details.
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\section Par02_s1 Detector description
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The geometry is read in from a GDML file, Par02FullDetector.gdml .
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The geometry is a simplified collider detector set-up used for the
|
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first FCC studies, inspired by ALEPH/ATLAS/CMS detectors.
|
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It is made of 4 main parts:
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- Tracker
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- Electromagnetic calorimeter
|
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- Hadronic calorimeter
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- Muon subdetector
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In this example, fast simulation parametrisation models exist for the
|
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first three subdetectors, but not for the Muon subdetector.
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The three parametrisation models:
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- Par02FastSimModelTracker : in the tracker
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- Par02FastSimModelEMCal : in the electromagnetic calorimeter
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- Par02FastSimModelHCal : in the hadronic calorimeter
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are build and bound to the respective subdetector (i.e. Geant4 regions)
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in the method: Par02DetectorConstruction::Construct() .
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Three configurations are possible for those parametrisation models:
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CMS-like, ALEPH-like, ATLAS-like.
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By default, the CMS configuration is used.
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\section Par02_s2 Primary generation
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In this example we use a very simple primary generation action,
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Par02PrimaryGeneratorAction, that uses the G4ParticleGun.
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One single particle type, with a well defined energy, and in one fixed
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direction is used for each run: the corresponding values can be set via
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macro commands. See examplePar02.in as an example.
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For the FCC studies, Pythia8 events in HepMC format were used for the
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generation of the primary particles.
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\section Par02_s3 Physics List
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A special, ad-hoc physics list is used in this example, in order to have
|
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an ultra-fast parametrised simulation: for all particles, the only two
|
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physics processes that are assigned are the decay process and the fast
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simulation process.
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The following three fast simulation models are defined:
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- Par02FastSimModelTracker :
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- bound to the tracker
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(see the method Par02DetectorConstruction::Construct )
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- applicable to all charged particles
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(see the method Par02FastSimModelTracker::IsApplicable )
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- triggered in all cases (i.e. no kinematic constraints)
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(see the method Par02FastSimModelTracker::ModelTrigger )
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- does the following: place the particle at the tracking detector exit
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(at the place the particle would reach without smearing), and, only
|
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if the particle is a primary, it smears the momentum of the particle
|
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according to a gaussian, with mean equal to 1.0 and sigma taken from
|
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the momentum resolution of the CMS tracker (with ALEPH or ATLAS tracker
|
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as a possible alternative)
|
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(see the method Par02FastSimModelTracker::DoIt )
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- Par02FastSimModelEMCal :
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- bound to the electromagnetic calorimeter
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(see the method Par02DetectorConstruction::Construct )
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- applicable to electrons, positrons, gammas
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(see the method Par02FastSimModelEMCal::IsApplicable )
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- triggered in all cases (i.e. no kinematic constraints)
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(see the method Par02FastSimModelEMCal::ModelTrigger )
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- does the following: kill the particle at the entrance of the
|
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electromagnetic calorimeter, and, only if the particle is a primary,
|
||||
it deposits in the electromagnetic calorimeter an energy obtained
|
||||
by a gaussian smearing (with mean equal to 1.0 and sigma taken from the
|
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energy resolution of the CMS electromagnetic calorimeter - with ALEPH
|
||||
or ATLAS electromagnetic calorimeter as a possible alternative) of the
|
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particle kinetic energy (at the entrance of the electromagnetic
|
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calorimeter)
|
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(see the method Par02FastSimModelEMCal::DoIt )
|
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- Par02FastSimModelHCal :
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- bound to the hadronic calorimeter
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(see the method Par02DetectorConstruction::Construct )
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- applicable to all hadrons (i.e. particles made of quarks)
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(see the method Par02FastSimModelHCal::IsApplicable )
|
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- triggered in all cases (i.e. no kinematic constraints)
|
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(see the method Par02FastSimModelHCal::ModelTrigger )
|
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- does the following: kill the particle at the entrance of the
|
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hadronic calorimeter, and, only if the particle is a primary,
|
||||
it deposits in the hadronic calorimeter an energy obtained by a
|
||||
gaussian smearing (with mean equal to 1.0 and sigma taken from the
|
||||
energy resolution of the CMS hadronic calorimeter - with ALEPH
|
||||
or ATLAS hadronic calorimeter as a possible alternative) of the
|
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particle kinetic energy (at the entrance of the hadronic
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calorimeter)
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(see the method Par02FastSimModelHCal::DoIt )
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\section Par02_s4 User actions, user information and user utility classes
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- Par02RunAction : run action used for initialization and termination
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of the run.
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- Par02EventAction : event action used for initialization and termination
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of the event.
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- Par02TrackingAction : tracking action used for killing particles with
|
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transverse momentum less than 1 MeV or
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pseudorapidity larger (in module) than 5.5
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(see method Par02TrackingAction::PreUserTrackingAction )
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and to store the information about the track at
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the end of the simulation of such a track
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(see method Par02TrackingAction::PostUserTrackingAction ).
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- Par02ActionInitialization : initialization of the primary generator class
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and all user-defined actions (i.e. the three
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classes above).
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- Par02PrimaryParticleInformation : utility class to store information
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associated with a primary particle.
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- Par02EventInformation : utility class to store information associated
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with a Geant4 event.
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- Par02DetectorParametrisation : a simple class used to provide the detector
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resolution and efficiency, according to the
|
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type of detector: tracker, electromagnetic
|
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calorimeter, hadronic calorimeter.
|
||||
There are 3 choices: CMS-like (default),
|
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ALEPH-like and ATLAS-like.
|
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The efficiency is currently set to 1.0 in
|
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all cases and not used.
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- Par02Smearer : a simple class that does the gaussian smearing, either
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of the momentum (in the tracker detector) or in energy
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(in the electromagnetic or hadronic calorimeter).
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\section Par02_s5 Output
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The execution of the program (examplePar02) produces in output, at the end
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of a run, a Root file, by default named DefaultOutput.root, which contains
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3 histograms and one ntuple.
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The macro file examplePar02.in specifies one run made of 1000 events
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each consisting of one 50 GeV electron.
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By editing the file, one could select alternatively a run made of 1000
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events each consisting of one 100 GeV muon, or a run made of 1000 events
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each consisting of one 20 GeV pion- .
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See the class Par02Output for the definition of the 3 histograms and the
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ntuples. Here is a quick summary:
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- histogram of the ratio of the momentum smeared and the original momentum
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in the tracker (for primary charged particles);
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- histogram of the ratio of the smeared energy deposited and the original
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energy at the entrance in the electromagnetic calorimeter (for primary
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electrons, positrons and gammas);
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- histogram of the ratio of the smeared energy deposited and the original
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energy at the entrance in the hadronic calorimeter (for primary hadrons);
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- ntuple containing the "Monte-Carlo true" information regarding the
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primary, and the resolution, efficiency, smeared momentum (tracker),
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smeared energy (calorimeter) and impact position (calorimeter) of each
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subdetector (tracker, electromagnetic calorimeter, hadronic calorimeter)
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where the primary is parametrised (tracker and electromagnetic calorimeter
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in the case of primary electrons, positrons and gammas; tracker and
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hadronic calorimeter in the case of primary hadrons; tracker only for
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all other primary charged particles, e.g. muons).
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Note:
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- you do not need to have the Root package available to run this example,
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but you need it if you want to look at the histograms and the ntuple
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contained in the Root output file;
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- because the class Par02Output is a singleton, this example must be run
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in sequential mode, not in multi-threaded mode;
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- sensitive detectors and hits are not used in this example.
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\section Par02_s6 How to build and run the example
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- You need to have built the Geant4 persistency/gdml module by having set
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the -DGEANT4_USE_GDML=ON flag during the CMAKE configuration step,
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as well as the -DXERCESC_ROOT_DIR=path_to_xercesc flag pointing to
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the path where the XercesC XML parser package is installed in your system.
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- Compile and link to generate the executable (in your CMAKE build directory):
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\verbatim
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% make
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\endverbatim
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- Execute the application:
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\verbatim
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% examplePar02 examplePar02.in
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\endverbatim
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which produces one Root file: DefaultOutput.root .
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*/
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@@ -0,0 +1,254 @@
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-------------------------------------------------------------------
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=========================================================
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Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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=========================================================
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||||
|
||||
Example Par02
|
||||
-------------
|
||||
|
||||
This example is a simplified version of a Geant4-based fast simulation
|
||||
program written by Anna Zaborowska for Future Circular Collider (FCC)
|
||||
studies.
|
||||
|
||||
This example shows how to do "track and energy smearing" in Geant4,
|
||||
in order to have a very fast simulation based on assumed detector
|
||||
resolutions.
|
||||
|
||||
The geometry which is considered is a simplified collider detector set-up,
|
||||
inspired by ALEPH/ATLAS/CMS detectors. Although it is much simpler than
|
||||
a realistic detector, it is anyhow fairly complex and therefore build up
|
||||
from a GDML file, Par02FullDetector.gdml .
|
||||
|
||||
In this example:
|
||||
- Particles with transverse momentum less than 1 MeV or pseudorapidity
|
||||
larger (in module) than 5.5 are neglected (i.e. the corresponding
|
||||
Geant4 track is killed as soon as it is created).
|
||||
- Any primary charged particle is smeared in the tracker as follows:
|
||||
its momentum is smeared according to a gaussian, with mean equal to 1.0
|
||||
and sigma taken from the momentum resolution of the CMS tracker
|
||||
(with ALEPH or ATLAS tracker as a possible alternative), and then placed
|
||||
at the end of the tracker, at the position that it would reach if
|
||||
normally transported (i.e. without smearing).
|
||||
- Any primary electron, or positron, or gamma is smeared in the
|
||||
electromagnetic calorimeter as follows: it is killed at the entrance
|
||||
of the electromagnetic calorimeter, with a deposited energy equal to
|
||||
the gaussian smearing (with mean equal to 1.0 and sigma taken from the
|
||||
energy resolution of the CMS electromagnetic calorimeter - with ALEPH or
|
||||
ATLAS electromagnetic calorimeter as a possible alternative) of its
|
||||
kinetic energy (at the entrance of the electromagnetic calorimeter).
|
||||
- Any primary hadron is smeared in the hadronic calorimeter as follows:
|
||||
it is killed at the entrance of the hadronic calorimeter, with a
|
||||
deposited energy equal to the gaussian smearing (with mean equal to 1.0
|
||||
and sigma taken from the energy resolution of the CMS hadronic
|
||||
calorimeter - with ALEPH or ATLAS hadronic calorimeter as a possible
|
||||
alternative) of its kinetic energy (at the entrance of the hadronic
|
||||
calorimeter).
|
||||
- The only competing physical processes with respect to the above physics
|
||||
parametrisations are the decays.
|
||||
Note: no electromagnetic processes;
|
||||
no momentum smearing in the tracker for secondary particles;
|
||||
secondary electrons, positrons, gammas in the electromagnetic
|
||||
calorimeter are killed (at the entrance) but without any
|
||||
energy deposition;
|
||||
secondary hadrons in the hadronic calorimeter are killed (at the
|
||||
entrance) but without any energy deposition.
|
||||
|
||||
|
||||
Below some details.
|
||||
|
||||
|
||||
1. Detector description
|
||||
-----------------------
|
||||
|
||||
The geometry is read in from a GDML file, Par02FullDetector.gdml .
|
||||
|
||||
The geometry is a simplified collider detector set-up used for the
|
||||
first FCC studies, inspired by ALEPH/ATLAS/CMS detectors.
|
||||
It is made of 4 main parts:
|
||||
- Tracker
|
||||
- Electromagnetic calorimeter
|
||||
- Hadronic calorimeter
|
||||
- Muon subdetector
|
||||
|
||||
In this example, fast simulation parametrisation models exist for the
|
||||
first three subdetectors, but not for the Muon subdetector.
|
||||
The three parametrisation models:
|
||||
- Par02FastSimModelTracker : in the tracker
|
||||
- Par02FastSimModelEMCal : in the electromagnetic calorimeter
|
||||
- Par02FastSimModelHCal : in the hadronic calorimeter
|
||||
are build and bound to the respective subdetector (i.e. Geant4 regions)
|
||||
in the method: Par02DetectorConstruction::Construct() .
|
||||
|
||||
Three configurations are possible for those parametrisation models:
|
||||
CMS-like, ALEPH-like, ATLAS-like.
|
||||
By default, the CMS configuration is used.
|
||||
|
||||
|
||||
2. Primary generation
|
||||
---------------------
|
||||
|
||||
In this example we use a very simple primary generation action,
|
||||
Par02PrimaryGeneratorAction, that uses the G4ParticleGun.
|
||||
One single particle type, with a well defined energy, and in one fixed
|
||||
direction is used for each run: the corresponding values can be set via
|
||||
macro commands. See examplePar02.in as an example.
|
||||
|
||||
For the FCC studies, Pythia8 events in HepMC format were used for the
|
||||
generation of the primary particles.
|
||||
|
||||
|
||||
3. Physics List
|
||||
---------------
|
||||
|
||||
A special, ad-hoc physics list is used in this example, in order to have
|
||||
an ultra-fast parametrised simulation: for all particles, the only two
|
||||
physics processes that are assigned are the decay process and the fast
|
||||
simulation process.
|
||||
The following three fast simulation models are defined:
|
||||
|
||||
- Par02FastSimModelTracker :
|
||||
- bound to the tracker
|
||||
(see the method Par02DetectorConstruction::Construct )
|
||||
- applicable to all charged particles
|
||||
(see the method Par02FastSimModelTracker::IsApplicable )
|
||||
- triggered in all cases (i.e. no kinematic constraints)
|
||||
(see the method Par02FastSimModelTracker::ModelTrigger )
|
||||
- does the following: place the particle at the tracking detector exit
|
||||
(at the place the particle would reach without smearing), and, only
|
||||
if the particle is a primary, it smears the momentum of the particle
|
||||
according to a gaussian, with mean equal to 1.0 and sigma taken from
|
||||
the momentum resolution of the CMS tracker (with ALEPH or ATLAS tracker
|
||||
as a possible alternative)
|
||||
(see the method Par02FastSimModelTracker::DoIt )
|
||||
|
||||
- Par02FastSimModelEMCal :
|
||||
- bound to the electromagnetic calorimeter
|
||||
(see the method Par02DetectorConstruction::Construct )
|
||||
- applicable to electrons, positrons, gammas
|
||||
(see the method Par02FastSimModelEMCal::IsApplicable )
|
||||
- triggered in all cases (i.e. no kinematic constraints)
|
||||
(see the method Par02FastSimModelEMCal::ModelTrigger )
|
||||
- does the following: kill the particle at the entrance of the
|
||||
electromagnetic calorimeter, and, only if the particle is a primary,
|
||||
it deposits in the electromagnetic calorimeter an energy obtained
|
||||
by a gaussian smearing (with mean equal to 1.0 and sigma taken from the
|
||||
energy resolution of the CMS electromagnetic calorimeter - with ALEPH
|
||||
or ATLAS electromagnetic calorimeter as a possible alternative) of the
|
||||
particle kinetic energy (at the entrance of the electromagnetic
|
||||
calorimeter)
|
||||
(see the method Par02FastSimModelEMCal::DoIt )
|
||||
|
||||
- Par02FastSimModelHCal :
|
||||
- bound to the hadronic calorimeter
|
||||
(see the method Par02DetectorConstruction::Construct )
|
||||
- applicable to all hadrons (i.e. particles made of quarks)
|
||||
(see the method Par02FastSimModelHCal::IsApplicable )
|
||||
- triggered in all cases (i.e. no kinematic constraints)
|
||||
(see the method Par02FastSimModelHCal::ModelTrigger )
|
||||
- does the following: kill the particle at the entrance of the
|
||||
hadronic calorimeter, and, only if the particle is a primary,
|
||||
it deposits in the hadronic calorimeter an energy obtained by a
|
||||
gaussian smearing (with mean equal to 1.0 and sigma taken from the
|
||||
energy resolution of the CMS hadronic calorimeter - with ALEPH
|
||||
or ATLAS hadronic calorimeter as a possible alternative) of the
|
||||
particle kinetic energy (at the entrance of the hadronic
|
||||
calorimeter)
|
||||
(see the method Par02FastSimModelHCal::DoIt )
|
||||
|
||||
|
||||
4. User actions, user information and user utility classes
|
||||
----------------------------------------------------------
|
||||
|
||||
- Par02RunAction : run action used for initialization and termination
|
||||
of the run.
|
||||
|
||||
- Par02EventAction : event action used for initialization and termination
|
||||
of the event.
|
||||
|
||||
- Par02TrackingAction : tracking action used for killing particles with
|
||||
transverse momentum less than 1 MeV or
|
||||
pseudorapidity larger (in module) than 5.5
|
||||
(see method Par02TrackingAction::PreUserTrackingAction )
|
||||
and to store the information about the track at
|
||||
the end of the simulation of such a track
|
||||
(see method Par02TrackingAction::PostUserTrackingAction ).
|
||||
|
||||
- Par02ActionInitialization : initialization of the primary generator class
|
||||
and all user-defined actions (i.e. the three
|
||||
classes above).
|
||||
|
||||
- Par02PrimaryParticleInformation : utility class to store information
|
||||
associated with a primary particle.
|
||||
|
||||
- Par02EventInformation : utility class to store information associated
|
||||
with a Geant4 event.
|
||||
|
||||
- Par02DetectorParametrisation : a simple class used to provide the detector
|
||||
resolution and efficiency, according to the
|
||||
type of detector: tracker, electromagnetic
|
||||
calorimeter, hadronic calorimeter.
|
||||
There are 3 choices: CMS-like (default),
|
||||
ALEPH-like and ATLAS-like.
|
||||
The efficiency is currently set to 1.0 in
|
||||
all cases and not used.
|
||||
|
||||
- Par02Smearer : a simple class that does the gaussian smearing, either
|
||||
of the momentum (in the tracker detector) or in energy
|
||||
(in the electromagnetic or hadronic calorimeter).
|
||||
|
||||
|
||||
5. Output
|
||||
---------
|
||||
|
||||
The execution of the program (examplePar02) produces in output, at the end
|
||||
of a run, a Root file, by default named DefaultOutput.root, which contains
|
||||
3 histograms and one ntuple.
|
||||
|
||||
The macro file examplePar02.in specifies one run made of 1000 events
|
||||
each consisting of one 50 GeV electron.
|
||||
By editing the file, one could select alternatively a run made of 1000
|
||||
events each consisting of one 100 GeV muon, or a run made of 1000 events
|
||||
each consisting of one 20 GeV pion- .
|
||||
|
||||
See the class Par02Output for the definition of the 3 histograms and the
|
||||
ntuples. Here is a quick summary:
|
||||
- histogram of the ratio of the momentum smeared and the original momentum
|
||||
in the tracker (for primary charged particles);
|
||||
- histogram of the ratio of the smeared energy deposited and the original
|
||||
energy at the entrance in the electromagnetic calorimeter (for primary
|
||||
electrons, positrons and gammas);
|
||||
- histogram of the ratio of the smeared energy deposited and the original
|
||||
energy at the entrance in the hadronic calorimeter (for primary hadrons);
|
||||
- ntuple containing the "Monte-Carlo true" information regarding the
|
||||
primary, and the resolution, efficiency, smeared momentum (tracker),
|
||||
smeared energy (calorimeter) and impact position (calorimeter) of each
|
||||
subdetector (tracker, electromagnetic calorimeter, hadronic calorimeter)
|
||||
where the primary is parametrised (tracker and electromagnetic calorimeter
|
||||
in the case of primary electrons, positrons and gammas; tracker and
|
||||
hadronic calorimeter in the case of primary hadrons; tracker only for
|
||||
all other primary charged particles, e.g. muons).
|
||||
|
||||
Note:
|
||||
- you do not need to have the Root package available to run this example,
|
||||
but you need it if you want to look at the histograms and the ntuple
|
||||
contained in the Root output file;
|
||||
- sensitive detectors and hits are not used in this example.
|
||||
|
||||
|
||||
6. How to build and run the example
|
||||
-----------------------------------
|
||||
|
||||
- You need to have built the Geant4 persistency/gdml module by having set
|
||||
the -DGEANT4_USE_GDML=ON flag during the CMAKE configuration step,
|
||||
as well as the -DXERCESC_ROOT_DIR=<path_to_xercesc> flag pointing to
|
||||
the path where the XercesC XML parser package is installed in your system.
|
||||
|
||||
- Compile and link to generate the executable (in your CMAKE build directory):
|
||||
% make
|
||||
|
||||
- Execute the application:
|
||||
% examplePar02 examplePar02.in
|
||||
|
||||
which produces one Root file: DefaultOutput.root .
|
||||
|
||||
Reference in New Issue
Block a user