DC2 Orbit and Background
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T. Burnett: DC2 kickoff 2-Mar -06 1 DC2 Orbit and Background 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
description
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) - PowerPoint PPT Presentation
Transcript of DC2 Orbit and Background
T. Burnett: DC2 kickoff 2-Mar-06 1
DC2 Orbit and BackgroundDC2 Orbit and Background
Orbit: 55 days
Pointing strategy: scan & rock!
BackgroundModel
generation
Interleave with signal
TriggerHardware
Onboard filter
DeadtimeSAA
Simulated trigger rate
Toby Burnett
University of Washington
T. Burnett: DC2 kickoff 2-Mar-06 2
The big pictureThe big picture
T. Burnett: DC2 kickoff 2-Mar-06 3
The OrbitThe 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=0theCape
“launch”
0 20 40 60
180
90
90
180
Inclination azimuth vs time
time (days)
azim
uth
(deg
)
T. Burnett: DC2 kickoff 2-Mar-06 4
Why 55 days? PrecessionWhy 55 days? Precession
For the inclination, 55.2 period.
Note initial azimuth is 0, an accident.
T. Burnett: DC2 kickoff 2-Mar-06 5
DC2 BackgroundsDC2 Backgrounds
S. Ritz (at the IA workshop): “Backgrounds are unbelievably unknown”
“DC2 background model is about right”
T. Burnett: DC2 kickoff 2-Mar-06 6
Generate an eventGenerate an eventcurrent time
Backgroundtuples
source modelpseudo-background
pointing history
Earth location
output tuple
generateposition, orientation
select incomingparticle
trigger?
alive?
generate output
select eventreplace position info
signal
no
yes
background
no
reconstruct
simulate
yes
in SAA?
signal?
no
yes
![Orbit type: Sun Synchronous Orbit ] Orbit height: …...Orbit type: Sun Synchronous Orbit ] PSLV - C37 Orbit height: 505km Orbit inclination: 97.46 degree Orbit period: 94.72 min ISL](https://static.fdocuments.net/doc/165x107/5f781053e671b364921403bc/orbit-type-sun-synchronous-orbit-orbit-height-orbit-type-sun-synchronous.jpg)
