MDM Trouble Report for 2011 Nov 14

Telescope: 2.4m
Observer(s): Sheffield (Columbia)
Instrument: Modspec+Nellie

Problem(s) Encountered:
Nellie had warmed when I began the night.
The detector would not cool to the normal minimum (-96C) and bottomed out at -49C.
There is frost on the outer casing, so there is likely loss of vacuum inside.
The detector was still functioning properly as I let it warm (biases and flats were normal).


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Submitted on 2011 Nov 14 [3:23:59]