LArG4/LArG4TB Based Simulations
for Combined Beam Test of EMEC and HEC

item Simulations environment and output data format
item Simulated data
item Calibration hits implementation

Simulations enviroment

The LArG4 package is a framework for simulation of the LAr calorimeters of the ATLAS detector. It can run both in standalone mode (support for the standalone version will be dropped soon), and also within the athena. The code is available from the central cvs repository, the detailed documentation is also available there.

The LArG4TB packages are used for the simulation of various TB setup. They are based on LArG4, and they depend on it, so one needs to install both. Some documentation how to install and run exist.

The EMEC/HEC TB is simulated with the LArG4TBEmecHec package, but also few others are needed (LArG4TBExpHall, LArG4TBHEC). The package contains all, what was implemented in the standalone sumulations. Two geometries are available for HEC within LArG4TBEmecHec package, the "standard" one, which is based on the code currently sitting in the ATLAS simulations, and the "standalone" one, which is based on the standalone version of the HEC G4 and standalone EMEC/HEC code. At the moment (Sept. 04) the geometries have different addresing schemes (on the level of Identifiers), but asking for the ADC channel output in command macros gives the same, proper channel numbering.

Output data format

  • The run information is stored in the LArG4TBEmecHecRun class, and info from each event in the LArG4TBEmecHecEvent class. The more detailed description of variables stored in the TTree is also available.
  • The energy deposits within one event can be either summed for each readout channel, and in this case the stored "address" for energy depositions in LAr and absorber is the readout channel (according standard TB mapping),
  • or all hits are stored separatelly, and then the stored address is a specially packed hit address.
  • If the energy depositions are summed, the cells in EMEC not connected to readout is stored according special scheme.
  • Hit address for EMEC and "HEC standard" corresponds to LArG4Identifier, for "HEC standalone" to the volume id.
  • The leakage detectors have also its own id scheme.

    • Calibration hits implementation

    In order to understand the energy calibration, the project of co called "calibration hits" has started. We try to implement these hits first on this test-beam.

    Calibartion description (to be done)

    Hit addresses for the LAr and absorber are the same as the standard one. The dead material hit addresses tries to follow the ATLAS proposal, with some modifications, following the test-beam specisics. The actual table of used identifiers.

    Last modified: September 21, 2004 Pavol Strizenec
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