Noise vs. Temperature
MIRI detectors have shown peaks in the detector readout
noise at specific temperatures, in the range of 7K where we tend to operate. To
check for excess noise at our operting temperature, or to optimize the
temperature at which we should operate, a series of noise runs (3 sets each of
5 ramps of 8) were taken at temperatures from 6k to 9K on the way up and then
9K to 7K on the way down. The noise results are plotted here.
There is a great deal of scatter, but generally speaking the
noise seems to increase with increasing temperature. The lowest noise actually
occurred at 6K rather than at 7K where we have been operating, so it may be
desirable to operate the array at a lower temperature in the future.
1 comment:
Are there other effects that could be an issue at the lower temperature? Trapped charge? Slower frame times?
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