Subject: Shack-Hartmann pre-emptions

From: Russet McMillan

Submitted: Thu, 26 Sep 2002 20:13:59 -0600 (MDT)

Message number: 615 (previous: 614, next: 616 up: Index)

In reference to Ed Turner's recent warning about the possibility of
some time being pre-empted so that we can get regular Shack-Hartmann
checks of collimation, I thought everyone would like to know of one
silver lining: any instrument may be run at the same time as the
Shack-Hartmann.  This means that while the S-H observations are being
made by the observing specialist, you make take biases with DIS or
SPIcam, darks with GRIM, or any cals using the internal lamps on the
Echelle or Fabry-Perot.  You will not have control of the telescope,
nor can we allow the lamps on the truss to be turned on, but hopefully
you won't find the time a complete loss.  The observing specialist
will also work with the observers to find a time window for the
pre-emption that's least disruptive to the science being done, within
the constraints of the S-H requirements.

I'll also add that the results we've obtained from the September
observations (kindly donated by Ed himself from his PU04 program, with
some other contributions of time from Chris Stubbs) indicate that
there is indeed a problem of changing collimation, and we have hopes
that diagnosing it will enable us to improve image quality
significantly.

					Russet McMillan.



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