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October 23, 2005
- Notes by DPC
Additional Recommendations
for Mimir Observers for the Fall Observing Quarter
In addition to the
recommendations in the previous
"Advice" page, please consider the following:
- The flat-field
lamps are not be very stable. This is less a problem for simple, photometric
and spectroscopic flats, but is an issue for polarimetry, linearity,
and gain calibration runs. Mitigations:
- Reduce the
Nexp (number of exposures) to one
- Perform many
cycles of "Lights-On" polarimetric (or linearity) cycles
so lamp variations can be reduced through averaging
- For "Lights-Off"
this is not a problem; you can either increase Nexp and do a single
run, or moderate Nexp and do a few runs.
- Remember,
for linearity data, "Lights Off" data are not needed,
you only need "Lights On" data
- Watch the detector
temperature on the Mimir Status Web Page. If there is a fluctuation
by more than 0.1K, stop observing until the fluctuations are below 10-15
milliK.
- If the 2nd stage
temperature shoots up, please call Amanda or Marc
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