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An infrared instrument used for observation has to keep the detector and optical components in a very cold environment
during operation. However, because of maintenance, upgrades, and other routine work, there are situations that require
the instrument to be warmed-up and then cooled-down again. At Subaru Observatory, our MOIRCS infrared instrument
has required warm-up and cool-down several times a year for routine maintenance and filter replacement. The MOIRCS
instrument has a large heat capacity and cool-down using only the closed cycle cooler is impractical due to the huge
amount of time it would require. To address this problem Subaru engineers have created a mechanism to allow PRE-COOLING
of the instrument via liquid nitrogen - allowing for a much faster pre-cool process. Even with liquid nitrogen,
the pre-cool process requires 10 tanks and almost a week of continual monitoring in order to reach the desired target
temperature. It is very difficult to work for such a long period of time at the oxygen starved summit of Mauna Kea (4205
meters),and issues of man-power and scheduling conflicts only add to the problems. To address these concerns Subaru
developed an automated pre-cooling system which works continuously and remotely at the summit. The strategy was to
have basic functionality for pre-cooling and user friendly interface. i.e. (1) Continuous cooling until the target
temperature is reached by automated liquid nitrogen tank exchanges and precision temperature control by automated
changes to the liquid nitrogen flow. (2) Remote monitoring and control of all parameter setting by Web browser as user
interface (UI). The goal of the Subaru pre-cooling system was to make it both inexpensive and quick to implement by
using existing technologies. The original goal (to cut down on labor and precision temperature control) has been attained
through several pre-cooling and software/hardware modification cycles. We will report on the progress and status of our
pre-cooling experiences in this presentation.
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