Refrigerator cryostat

Details Refrigerator cryostat Refrigerator cryostat

1981-12-07

1983-10-11

Capossela, Ronald C.

Refrigeration

Refrigeration producer

Evaporator, e.g., heat exchanger

62 555, 62268, 55269, F25B 1900

Patent

active

044084692

ABSTRACT:
A refrigerator cryostat for producing high vacuums at controlled temperatures in a sample chamber has first and second refrigerator stages for progressively lowering the refrigerator temperature to the sample chamber. An independent heater heats the sample chamber to provide, in combination with the refrigerator temperature, the controlled temperatures to the sample chamber. A vacuum pump preliminarily evacuates a casing about the refrigerator stages which is also in vacuum communication with the sample chamber, but a pumping surface in thermal communication with the first refrigerator stage and in the casing cryogenically augments the preliminary evacuation to the high vacuum levels necessary for operation of the refrigerator cryostat at sample chamber temperatures of, for example, from about 10.degree. K. to about 350.degree. K.

REFERENCES:
patent: 4150549 (1979-04-01), Longsworth
patent: 4266959 (1981-05-01), Welch
patent: 4295338 (1981-10-01), Welch
patent: 4311018 (1982-01-01), Welch

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