The first data from ATLAS detector will be the cosmic rays. Therefore, it is quite interesting to look whether this data could be of any use for commisioning and calibration of ATLAS, namely its Pixel detector. The eventual results should be something similar to the PixelCosmicsAnalysisResults.

Generation and Simulation for Release 13

Convenient tool for generating muons is a Cosmic Gun which generates muon on the surface. The simulation subsequently propagated the muons down to the ATLAS cavern. All this is already contained in package G4AtlasApps. The documentation for the generation and simulation of cosmic muons in general could be found in a CosmicSimulation. Although this page is quite old it contains a lot of useful information. However, there are new versions of geometry, which should be used in the simulation

It is based on ATLAS-CSC-00-01-00 and contains also the cavern and shafts.
The same as before, but without the magnetic field

All parameters are set in Namely the user can choose the minimal and maximal energy, cut on incident angle and the "optimalization for cavern" which means that only the muons pointing to a sphere of specified radius are used.

If you want to run the cosmic simulation in Release 13, please read RecipesG4AtlasApps. The problem with this release is, that the geometries ATLAS-Comm does not work with slc4. Therefore, you have to set your main requirements file to use slc3 by hand in case you are not already using it. This can by done for example by adding this line

set CMTCONFIG i686-slc3-gcc323-opt

Also, you might want to check out the Simulation/G4Atlas/G4AtlasApps package, to have a full control over the simulation. Job Option files for the simulation are in the /share directory. They are documented in the package README file.

A test sample of 5000 muon have been simulated within the release 13.0.10 with the settings listed below. The geometry was ATLAS-CommNF-01-00-00. Result could be found in


The list of used parameters:

    CosmicGenerator.emin = 10000;  # 10 GeV
    CosmicGenerator.emax = 2000*1000; # 2 TeV
    CosmicGenerator.xvert_low =   -301700.
    CosmicGenerator.xvert_hig =    298300.
    CosmicGenerator.zvert_low =    -300000.
    CosmicGenerator.zvert_hig =    300000.
    CosmicGenerator.yvert_val =    57300+41000.
    CosmicGenerator.ctcut     =    0.0
    CosmicGenerator.OptimizeForCavern= True


Reconstruction and Analysis


  • A nice note about trigger rates for cosmic muons by Seth Zenz
  • Study of the initial ATLAS physics signals


  • Francesco Conventi's talk on Trigger and Physics week on May 30, 2006: slides
  • Richard Teuchers' talk on LAr Week on Sep 20, 2006: slides
  • Josť Maneira's talk on ID Offline Commisioning on Jan 31, 2007: slides
  • Pavel Jez's talk on Pixel Offline Software on Jun 4, 2007: slides

Related Topics

-- PavelJez - 08 Jun 2007
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