Subject: DSC efficiency

From: Constance Rockosi

Submitted: Mon, 4 Mar 1996 16:21:58 -0600

Message number: 26 (previous: 25, next: 27 up: Index)

DSC users:

My understanding is that the data that both Kris and Xiaohui took for
their efficiency calculations were taken after the camera was brought
to FNAL for repairs.  One of the reasons for the trip was that somehow
water (or something) had condensed onto the chip, producing what
looked like a mottled flat field.  The anti-reflection coating is very
fragile, and there were some photos taken at FNAL that clearly show
damage to the coating.  I suspect the QE has been seriously degrated.
Jim Annis and Shu-i Wang brought the chip to SITe for cleaning, but
the spots are still there.

Did anyone do similiar calculations when DSC first got its current chip?

--Connie Rockosi


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