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CORSIKA/MMC for the IceCube simulation production

CORSIKA/MMC for the IceCube simulation production. Dmitry Chirkin. chirkin@physics.berkeley.edu University of California at Berkeley, Berkeley, CA 94720, USA IceCube Detector Simulation workshop, Belgium, October 2003. Talk outline. generators/propagators – what are they good for?

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CORSIKA/MMC for the IceCube simulation production

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  1. CORSIKA/MMC for the IceCube simulation production Dmitry Chirkin chirkin@physics.berkeley.edu University of California at Berkeley, Berkeley, CA 94720, USA IceCube Detector Simulation workshop, Belgium, October 2003

  2. Talk outline • generators/propagators – what are they good for? • description of optimizations done for AMANDA-II: • CORSIKA • MMC • conclusions

  3. Simulation chain as used in AMANDA • known muon propagators: • MMC • MUM • mudedx • Lip • Loh generator step • known air shower • generators: • CORSIKA based • dCORSIKA • pCORSIKA • basiev propagator step • Also new possible applications: • CORSIKA => atm. ν generation • Kosta Schinarakis, Wuppertal • MMC => monopole propagation • Peter Niessen, Arvid Pohl

  4. CORSIKA settings • 6 interaction models, QGSJET, VENUS and NEXUS describe AMANDA-II data best, QGSJET is by far the fastest • Atmosphere and Earth’s surface are curved • Detector is assumed cylindrical

  5. Running CORSIKA consists of 2 steps: • CORSIKA (shower generation) • UCR (Utility for CORSIKA output Randomization – shower location randomizer)

  6. Running MMC • Basic features: • can propagate muons with fixed vcut or ecut in regions 1 • and 2 (use negative values to change default behavior) • propagates muons with up to 1020 eV, can be used up to • 1030 eV (enable with “–ebig=1.e21” flag) • can propagate muons and/or taus. To propagate both, • run MMC for taus first, then pipe into MMC for muons • Can propagate muons though multiple media with • spherical or flat interfaces. For concentric media uses • external file with media location definitions • User line can be enabled for each muon. To ensure • compatibility with other AMANDA software, use • “-rdmc” (for f2k) and/or “-amasim” (for AMASIM) • provides multiple output formats (3 at the moment) Vcut=0.05, 0.01, 10-3 and 10-4 Usual (no cont) vs. cont option • Defalt values used for AMANDA: • vcut=0.05, cont • ecut=500 MeV no cont • vcut=1.0 no cont User line definition: USER_DEF mmc_en NR E_INI E_CPD E_IN E_OUT CDP_X CDP_Y CDP_Z Z_IN Z_OUT

  7. MMC optimizations cont. • Interpolation routines and strategy of their use have been heavily optimized • Parameterization and interpolation settings can be easily reconfigured (e.g. with “-g=[romberg]” option at run time or with “-hifi” option during compilation) • Algorithm works to the extreme: tested up to the muon energy of 1030 eV and vcut as low as 10-15.

  8. Conclusions and dicussion • CORSIKA and MMC have been heavily optimized • Please note that some optimization settings are AMANDA-II specific and need to be recalculated for desired IceCube geometry

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