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EPTHERM202 is a cryogenic gas flow system, which stabilizes
a set-up temperature of a probe within ESR spectrometer resonator. EPTHERM202
consists of a storage dewar, a gas generator, a gas flow nozzle system and a
temperature controller unit. Gas generator produces a cryogenic gas flow at a
fixed temperature. The gas flows from the storage dewar to the nozzle system
through a vacuum isolated transfer line. The nozzle system consists of the heat
exchanger controlled by the temperature controller unit, a system of gas flow
formation inside the resonator, and the quartz dewar holder. The adsorption pump
mounted inside the nozzle system secures the vacuum isolation of the transfer
line. A membrane pump connected to the outlet of the nozzle system results in
additional lowering of the gas temperature.
The gas generator connected to the storage dewar forms a
permanent gas flow. The heat exchanger of the nozzle system supplied by the
power output of the temperature controller unit heats the cryogenic gas up to
the needed temperature.
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After the heat exchanger the gas flows through the
quartz dewar with vacuum isolated walls. The quartz ampoule with a sample is
mounted inside the quartz dewar. The pumping enhances the gas flow rate through
the system. A temperature sensor placed at the end of the nozzle monitors the
temperature near the sample. For operation at high temperatures, the gas
generator and nitrogen storage dewar should be replaced by the high pressure
nitrogen gas containers connected to the nozzle
system.
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