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Analysis meeting 11July05 - T. Burnett 1 Status of the Background Review DC2 prep meeting: Switch to CRflux package by Mizuno for charged particles, Earth.

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Presentation on theme: "Analysis meeting 11July05 - T. Burnett 1 Status of the Background Review DC2 prep meeting: Switch to CRflux package by Mizuno for charged particles, Earth."— Presentation transcript:

1 Analysis meeting 11July05 - T. Burnett 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

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

3 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??

4 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” run: second # after launch (~6000 runs/orbit) Filter rate

5 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)

6 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

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