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