On Micro VAX farms and shower libraries [electronic resource] : Monte Carlo techniques developed for the D0 detector

Published:: Batavia, Ill. : Fermi National Accelerator Laboratory, 1988.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: Pages: 30 : digital, PDF file
Additional Creators:: Fermi National Accelerator Laboratory and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

In order to predict correctly the effects of cracks and dead material in a nearly hermetic calorimeter, hadronic and electromagnetic showers need to be simulated accurately on a particle by particle basis. Tracking all the particles of all showers in the calorimeter leads to very large CPU times (typically 5 hours on a VAX780) for events at ..sqrt..(s) = 2TeV. Parametrizing the energy deposition of electromagnetic particles in showers with energy below 200 MeV results in event times of the order of 1 hour on a VAX780. This is still unacceptably large. The D0 collaboration then employed a farm of 16 MicroVax II's to get acceptable throughputs. The calorimeter hit patterns of each individual track was output, to be summed up by a later job. These individual hit patterns were entered into a random access shower library file, which was then used for subsequent Monte Carlo simulations. This shower library technique results in further speed-ups of a factor of 60 without degrading the quality of simulation significantly.

Report Numbers:

E 1.99:fnal/c-88/16-e
E 1.99: conf-8708186-4
conf-8708186-4
fnal/c-88/16-e

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Note:

Published through SciTech Connect.
01/01/1988.
"fnal/c-88/16-e"
" conf-8708186-4"
"DE88005962"
Workshop on detector simulation for the SSC, Argonne, IL, USA, 24 Aug 1987.
Raja, R.

Funding Information:

AC02-76CH03000

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