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DC2 Orbit and Background

Orbit: 55 days Pointing strategy: scan & rock! Background Model generation Interleave with signal Trigger Hardware Onboard filter Deadtime SAA Simulated trigger rate. Toby Burnett University of Washington. DC2 Orbit and Background. The big picture. The Orbit. Time references (UT)

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DC2 Orbit and Background

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  1. Orbit: 55 days Pointing strategy: scan & rock! Background Model generation Interleave with signal Trigger Hardware Onboard filter Deadtime SAA Simulated trigger rate Toby Burnett University of Washington DC2 Orbit and Background

  2. The big picture

  3. The Orbit • Time references (UT) • Mission start 00:00 1-1-2001 • This simulation 00:00 1-1-2008 • JD 2454466.5 = MJD 54466 • MET: 220838400 • Stoneking simulator • “launch” from lat,lon=(0,0) at -900 s. • Altitude 561 km. (6939 km radius) • Inclination 28.48 (Cape Canaveral latitude) (next DC: maybe 25.3?) • Recorded from t=0 to t=56 days in 30 s increments. 161250 entries t=0 theCape “launch”

  4. Why 55 days? Precession • For the inclination, 55.2 period. • Note initial azimuth is 0, an accident.

  5. DC2 Backgrounds • S. Ritz (at the IA workshop): • “Backgrounds are unbelievably unknown” • “DC2 background model is about right”

  6. Generate an event current time source model pseudo-background generateposition, orientation pointing history select incomingparticle yes in SAA? Earth location no signal signal? background simulate select eventreplace position info Backgroundtuples no trigger? yes no alive? yes generate output output tuple reconstruct

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