Thin Shell, Segmented X-Ray Mirrors

Table 2

The foil mirrors being developed for Astro-H.

	SXT	HXT
Diameter (cm)	45	45
Focal length (m)	5.6	12
Number of shells	203	213
Number of modules per mirror	4	3
Segment length (cm)	10	20
Total number of segments	1624	1278
AI Substrate thickness (mm)	0.152, 0.229, 0.305 mm	0.2 mm
Surface production method	replication	replication
Reflective coating	gold	Pt/C multilayer
Mass (kg)	56	80
Effective Area (cm^2)	510 @ 1 keV	800 @ 6 keV
	390 @ 7 keV	200 @ 40 keV
Angular resolution (arcmin)	1.7 (goal <1.3)	2 (goal <1. 7)