The primary load-carrying structure for the Optical Bench
Assembly is the graphite-epoxymatched set that includes the
Aft Optics Platform (AOP) (Fig. 1) and the Afocal Telescope
The AOP provides optically accurate positioning of the four
objective assemblies and the dichroic assembly. It also provides
the mounting plane for the Passive Radiative Cooler using
three titanium anchors.
The ATB provides accurate registration of the primary, secondary,
and fold telescope mirrors to each other, and a close-tolerance
three-point mount for the AOP, which aligns the aft optics
to the telescope. Optical alignments are in the order of 25µm.
The combined weight of the Optical Bench Assembly is 22 kg.