PESAsim : A PESA simulation tool to for fast validation and tuning.

• PESAsim is the name for the new "eGamma" framework. It has been developed as a fast simulation of the PESA event selection algorithms and steering to allow fast prototyping of algorithms and their validation, and to allow automatic, iterative tuning strategies.
• Internally, the event data structure closely resembles that used online in the trigger to enable fast transfer of algorithms without too much recoding.
• The framework itself, simulates the behaviour of the online steering, and can be used for ensembles of trigger signatures, including complete trigger menus, and multiple object triggers.

History

• PESAsim developed as a replacement for the old root eGamma framework, however, to achieve the correct functionality, in terms of event selection and rejection for general use a minimal simulation of the steering was implemented.
• The framework is not limited to the simulation of eGamma signatures and hypotheses algorithms, hence the name change.
• In principle, given the necessary implementation of the relevant selection algorithms, there is no reason why PESAsim should not be able to implement a reasonably code simulation of a complete set of ATLAS trigger menus.

Documentation

• A (developing) user manual is available here.
• Doxygen documentation of the code, and classes is available here.
• code viewable in cvsview

Getting Started

Download the source code, it is available:

• from the ATLAS cvs repository (temporarily) under Trigger/TrigAnalysis/TrigEgammaAnalysis/*/PESAsim the plan is to move it to a package of its own in the near future
• as a tarball from here
• or under afs at /afs/cern.ch/user/s/sutt/public/pesasim/v0.2.6/pesasim-v0.2.6.tgz

Untar the package, go to the src directory and type

• make install

This creates the rest of the directory structure and builds the libraries and a test executable.

The project contains the directories

• config config files needed for execution
• examples example projects
• exe executables are built here
• lib libraries
• obj object code
• src source code

The examples directory has example projects for various purposes, eg simple evaluation, automated fitting and so on.

Good luck!!

-- MarkSutton, RicardoGoncalo - 24 Jan 2006