Cryogenic expansion joint for large superconducting magnet struc

Details Cryogenic expansion joint for large superconducting magnet struc Cryogenic expansion joint for large superconducting magnet struc

1976-06-24

1978-01-03

Pendegrass, Verlin R.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Plural load device systems

3151114, 174 12R, G21B 100, H01J 724

Patent

active

040664961

ABSTRACT:
An expansion joint is provided that accommodates dimensional changes occurring during the cooldown and warm-up of large cryogenic devices such as superconducting magnet coils. Flattened tubes containing a refrigerant such as gaseous nitrogen (N.sub.2) are inserted into expansion spaces in the structure. The gaseous N.sub.2 is circulated under pressure and aids in the cooldown process while providing its primary function of accommodating differential thermal contraction and expansion in the structure. After lower temperatures are reached and the greater part of the contraction has occured, the N.sub.2 liquefies then solidifies to provide a completely rigid structure at the cryogenic operating temperatures of the device.

REFERENCES:
patent: 3607444 (1971-09-01), DeBucs
ORNL-TM 3096, pp. 1-77.
ORNL-TM 4342 pp. 1-22.
Proceedings of 5th Symposium on Engineering Problems of Fusion, 10/5-9/73, pp. 545-547.
UWFDM-112 (8/75) pp. III-A-20 - III-A-25.

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