Analysis Meeting 5/25/05 - T. Burnett 1 Background status G4 Multiple scattering Toby Burnett.

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Presentation transcript:

Analysis Meeting 5/25/05 - T. Burnett 1 Background status G4 Multiple scattering Toby Burnett

Analysis Meeting 5/25/05 - T. Burnett 2 New scan-mode pointing history file See the confluence DC2 page 565 km altitude (up from 550) 1-May-07 launch (was 05) 56.5 days (one precession period: DC2 is for one month) 30-s intervals Sun avoidance, rocking, etc.

Analysis Meeting 5/25/05 - T. Burnett 3 The current background model CRflux, representing published work by Mizuno, et.al Protons, electrons, positrons Gammas from gamma_albedo (Earth in wings) Tests with new orbit seconds = 9 orbits Set area to 6 cm 2 or of the generated rate for GLAST

Analysis Meeting 5/25/05 - T. Burnett 4 Results: rate vs time total protons

Analysis Meeting 5/25/05 - T. Burnett 5 And the positrons?

Analysis Meeting 5/25/05 - T. Burnett 6 Next steps Verify all sources with Mizuno Get Earth source fixes from Dirk

Analysis Meeting 5/25/05 - T. Burnett 7 New check of G4 multiple scattering How best to compare distributions? Must investigate shape, especially tails: is it gaussian? What fraction are single-scatter tails? Scale factor: how close to the PDG? My solution: cumulative distributions vs. log(  ) Gaussian is simple exponential Fraction in tail easy to compare with equivalent gaussian Scale factor is just shift in log(  ) Analysis: run 10K particles using our slab application in GEANT4TEST, record outgoing directions

Analysis Meeting 5/25/05 - T. Burnett 8 Our favorite case: positrons in 105 micron W: