MRI cryostat cooled by open and closed cycle refrigeration syste

Details MRI cryostat cooled by open and closed cycle refrigeration syste MRI cryostat cooled by open and closed cycle refrigeration syste

1995-09-06

1996-12-24

Capossela, Ronald C.

Refrigeration

Storage of solidified or liquified gas

With conservation of cryogen by reduction of vapor to liquid...

62 511, F17C 502

Patent

active

055864376

ABSTRACT:
A MRI cryostat, which contains a superconducting magnet operating in a bath of liquid helium, reduces the boil-off rate of helium by intercepting most of the heat in-leakage by means of a throttle cycle (TC) refrigerator operating at a low side temperature of about 90K. The main heat exchanger for the throttle cycle refrigerator is located within or immediately adjacent to the cryostat housing and delivers cold liquid to a cold heat exchanger that is in thermal contact with an outer radiation shield, support struts, neck tube and electrical leads inside the cryostat. Heat is intercepted by the outer shield from essentially all paths between a 300K ambient and a 4K load temperature, which temperature results from liquid helium boil-off to atmosphere. A second, inner radiation shield at 35K is cooled by gaseous helium that boils from the liquid helium bath. There are no moving parts of the refrigeration system in the cryostat. Thus, vibration, noise and disturbance of the magnetic field are reduced. The refrigerator installation is small and low in cost; power consumption is reduced relative to the prior art.

REFERENCES:
patent: 4277949 (1981-07-01), Longsworth
patent: 4279127 (1981-07-01), Longsworth
patent: 4766741 (1988-08-01), Bartlett et al.
patent: 4790147 (1988-12-01), Kuriyama et al.
patent: 4796433 (1989-01-01), Bartlett
patent: 5339650 (1994-08-01), Hakamada et al.
patent: 5381666 (1995-01-01), Saho et al.
Longsworth and Boiarski, New Smart Gaseous Material for Cryogenic Applications-Apr. 26, 1995, pp. 1-4.
Longsworth Boiarski and Klusmier, 80K Closed Cycle Throttle Refrigerator, Jun. 1994, pp. 1-5.

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