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Status of the Background

Status of the Background. Review DC2 prep meeting: Switch to CRflux package by Mizuno for charged particles, Earth by Petrie for gamma

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Status of the Background

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  1. Status of the Background Review DC2 prep meeting: Switch to CRflux package by Mizuno for charged particles, Earth by Petrie for gamma Report on 8 sampled orbit-seconds from default orbit: indicated that the rate is 8 kHz, downlink 450 Hz. NOTE: this was a preliminary status, not a prediction! Reason for 2X increase from PDR seems to be trapped positrons. Update here: ~80 sampled seconds from full DC2 orbit Analysis of trigger bits Analysis meeting 11July05 - T. Burnett

  2. The electrons and positron fluxes: Mizuno’s plots Geomagnetic latitude low medium high electrons positrons Analysis meeting 11July05 - T. Burnett

  3. Electrons and positrons • Questions: • Why the big asymmetry? • Why are fluxes so large? • Why is it isotropic? • How does the flux depend on altitude? • Why is the flux largest at low geomagnetic latitudes? • The model: • Secondary particles generated by primary protons near geomagnetic poles, were flux is highest • E-W effect explains the charge asymmetry: protons are curving down due to field, positive secondaries bend up, negative down. • Secondaries are then trapped by field, accumulate in flux tubes: explains • large flux (multiple traversals of a target by single particle) • isotropy. • Largest near equator? • Data only at Shuttle altitude, AMS: does it increase?? Analysis meeting 11July05 - T. Burnett

  4. Breakdown of filter output according to source 1/100 sampling of an orbit All “triggers”, no throttle, includes “LOCAL” Filter rate run: second # after launch (~6000 runs/orbit) Analysis meeting 11July05 - T. Burnett

  5. What about those trigger rates? • 8 kHz is unacceptable, 25 s deadtime  20% loss • Oops, it included LOCAL only, contributing ~800 Hz • LOCAL is not currently valid, due to use of calibration constants • How about that throttle! Kill a TKR if: • “Ritz”: ACD tile associated with triggering tower fires [carefully implemented in code by David Wren] 2.2 kHz (preliminary, of course) • “Atwood”: ACD and no LOCAL. 2.0 kHz (ditto) Analysis meeting 11July05 - T. Burnett

  6. Ongoing stuff at UW • Better (automatic) trigger bit analysis • Finish classification trees • Define set for PSF/Aeff analysis • Allow analysis of throttle implication for Aeff • More data! • First orbit is flawed, trigger bits were not saved • Second orbit almost ready Analysis meeting 11July05 - T. Burnett

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