Subject: DIS red side upgrade completed

From: Ed Turner

Submitted: Sat, 26 Apr 2003 14:23:41 -0400 (EDT)

Message number: 667 (previous: 666, next: 668 up: Index)

Installation of the new red side optics on DIS has been completed, and the 
instrument has been returned to service.  As those of you who used it during 
the last week know, there were some glitches in returning it to normal 
operation after the upgrade work.  One problem remains in fact (see 
below), but the instrument is now considered ready for scheduled science 
runs.  This stage of the DIS upgrade project, like the earlier ones, was 
led by Jeff Morgan, and many others at APO and UW contributed as well.

The remaining problem is that the electronic noise on the red side has 
increased since the dewar was re-assembled.  The cause of the added noise 
is being investigated, and an attempt to fix it will be scheduled as soon 
as possible.  In the mean time it may create problems in obtaining spectra 
of the faintest sources (on the red side only, of course).  DIS users 
should consult their OS for the latest information re this probelm.

Ed Turner


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