OTrCosmics Offline Software

Event generation

To simulate events we have implemented a simple cosmics generator in Gauss. It currently resides in Gen/ParticleGuns. It has been tested on top of Gauss_v30r3, but it will probably work with any version. To run the simulation

  • create a release diretcory
  • check out Gen/ParticleGuns, configure and compile
  • check out Sim/Gauss, configure and compile
  • go to the job, directory, copy the jop-option file, edit to your liking and run gauss
       cd $GAUSSROOT/job
       cp $PARTICLEGUNSROOT/options/otrcosmics.opts .
       $GAUSSROOT/$CMTCONFIG/Gauss.exe otrcosmics.opts |& tee gausslog.txt


You can run the default Boole to process the .sim file you have just generated. Make sure to set the proper input files (including catalouge) and to turn the magnetic field off:

      MagneticFieldSvc.UseConstantField = true;


You can try to reconstruct the events created with Boole with the standard brunel. Ther are two main reasons why you will not get any reasonable tracking efficiency

  • the timing of the OT hits is entirely wrong: The MC is properly calibrated only for 'c=1' particles from the LHCb origin. The timing of our cosmics is odd in two ways * they are spread evenly in the 25ns readout window * they traverse the detector upstream For now, the only solution is not to use drifttimes in reconstruction. We need to prepare the software for that;
  • all T-station tracking algorithms reconstruct tracks in the top (+y) and bottom (-y) sections seperately. Our cosmic muons traverse station 3 in the top sector and station 1 in the bottom sector. (Station 2 will probably be a mix, but that depends where exxctly we put the scintillators.)


-- WouterHulsbergen - 24 Sep 2007

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Topic revision: r1 - 2007-09-24 - WouterHulsbergen
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