Introduction

The SODART Mirror Modules, designated FM1 & FM2, are two identical, multiply-nested, thin-foil telescopes. The mirror surfaces are conical approximations to a Wolter 1 geometry telescope, and are designed for moderate on-axis spatial resolution and high throughput above $\sim$6 keV. The mirrors are assembled in quadrants and then attached to a support structure to form a complete mirror.

Parameters for each unit are listed in Table 2, and the available instrumentation is listed in Table 3.

 

Table 2: Mirror Module Parameters

Field of View (diameter)	60 $^{\prime}$
Half Power Diameter	2.5-3 $^{\prime}$
Focal Length	8 m
Inner Shell Diameter	16.32 cm
Outer Shell Diameter	60 cm
Reflecting surface	350 Å gold
Shell material	0.4 mm aluminum
Shell separation (min)	0.52 mm
Shell length	20 cm
Number of shells	143
Mass per telescope	101 kg
Total mirrored surface	62 m2

 

 

Table 3: Mirror Module Instrumentation

FM1	FM2
LEPC-1	LEPC-2
HEPC-1	HEPC-2
KFRD-1	KFRD-2
SIXA	SXRP
	OXS

 

Pre-flight calibration of the mirrors has been conducted at the Expanded Beam X-ray Optics Facility at the Daresbury Synchrotron, and is described in detail in Christensen et al. (1997). Their results are summarized here.