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Basic Design X-dimension of FOV: w/h Y-dimension of FOV: d/h (might be collimated by a few slats) – Longer exposure time for a source – Better statistics ΔΘx ~ u x /(hN 1/2 ) –Larger h desired ΔΘy ~ fu y /(hN) –Larger h desired CCD array 1-dim coded mask w d uxux uyuy h f: open fraction orbital motion Unit camera
Citation preview
A Coded-Mask CCD Camera for MAXI-2
Taro Kotani, Tomohiko Iguchi, Takayuki Shiraki, Kazutaka Yamaoka, Atsumasa Yoshida (Aoyama Gakuin Univ.), Takuya Kato,Shigeyuki Sako (Univ. of Tokyo), for The MAXI Team
!!! DRAFT !!!
Concepts
• An all-sky monitor with CCD cameras optimized for ISS
• Better position determination than GSC and SSC– Uncertainty less than 0.1 deg in 1 orb (0.1 mCrab)
• To be built in time (Earliest launch: 2015)
• Affordable within the budget
Basic Design
• X-dimension of FOV: w/h
• Y-dimension of FOV: d/h (might be collimated by a few slats) Longer exposure time for a source Better statistics
• ΔΘx ~ ux/(hN1/2)– Larger h desired
• ΔΘy ~ fuy/(hN)– Larger h desired
CCD array
1-dim coded mask
wd
ux
uy
hf: open fraction
orbital motion
Unit camera
Constraints
• Electricity/thermal output/budget CCD area FOV
• h position uncertainty
Simulation
• Sensitivity
• Position determination
• Spectroscopy/temporal analysis