2.3.1 Intended Use
The vacuum control unit is a device used for vacuum control of Montana Instruments cryostats. It is
designed to connect to the system control unit and cryostat provided by Montana Instruments. It is
recommended to locate the vacuum control unit near both connected apparatuses.
2.3.2 Components
The vacuum control unit consist of an outer enclosure, diaphragm (roughing) pump, ¼ inch vacuum
coupling O-ring connection, two valves, and several communication ports. The enclosure is compatible
with a standard 19-inch equipment rack (6U) and can be mounted with other rack mount devices. It can
alternatively be placed independently on a table or shelf.
The roughing pump is used to achieve a rough vacuum. A high vacuum is achieved with cryopumping.
During cooldown, the sample platform temperature lags the Stage 1 temperature in the cryostat by
~100 K so that remaining particles are trapped by the charcoal adsorbers, keeping the sample clean and
free from contamination. When venting after warmup, a dry nitrogen purge (if attached) is used to clean
the vacuum system.
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