Subject: Instrumentation/Guider Update

From: Ed Turner

Submitted: Thu, 12 Sep 2002 17:01:27 -0400 (EDT)

Message number: 605 (previous: 602, next: 607 up: Index)

As described previously there were several problems with 3.5m
instrumentation at the end of the shutdown.  Here is an update on the
situation:

The Echelle has been returned to service and is fully functional again;
the "halos" seen previously and believed to be due to "frosting" of the
internal optics by some contaminent have been eliminated by a new cooling
procedure/sequence.

Replacement parts for the SPICam Cryotiger cooler are being shipped today,
and it is hoped that SPICam will be returned to service late next week.
This schedule assumes that no unexpected glitches arise in the process of
putting the instrument back into operation.

The situation of the NA2 guider is the least clear, but the vendor
indicates that it *might* be repaired and shipped back to APO within 7 to
10 days.  However, they have not yet completed the diagnostic work, and
there may be undetected problems, so this must be regarded as an
optimistic scenario.

GRIM2 is operational but continues to encounter intermitent quadrant
failures which can be cured by power cycling.

DIS is fully functional, and recent throughput measurements indicate that
it is working very well indeed post upgrade and realuminization.  Details
to follow from Jon Holtzman.

Ed Turner


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