Thermal Shield Bowing in Long Superconducting Magnets
One of the interesting problems associated with building long magnets for the SSC (Superconducting Super Collider) is predicting and controlling the dynamic response of the cryostat tubes during cooldown. Thermal bowing occurs in any of these tubes that are asymmetric in shape or which are not cooled uniformly. Understanding the bowing behavior is important for two reasons: First, one needs to know the magnitude of the induced displacements so that potential interferences in the entire magnet assembly can be located. Second, the bowing phenomenon introduces structural loads on the supports which need to be folded into the design of those supports. It is desirable, due to cost and time constraints, to develop an analytical model which accurately predicts loads and displacements rather than relying on a physical model of each candidate cryostat tube design. This report describes a procedure and an analytical model to predict this dynamic behavior on the thermal radiation shield for Fermilab’s proposed SSC magnet design. The results are compared with test data obtained on a physical model fabricated and tested in an effort to verify the analytical approach.
KeywordsFinite Element Model Cold Side Thermal Shield Cold Side Temperature Fermi National Accelerator Laboratory
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- 1.H. I. McHenry, Structural alloys, in: “Materials at Low Temperatures”, R. P. Reed and A. F. Clark, eds., American Society for Metals, Metals Park, OH (1983), p. 401.Google Scholar
- 2.“Handbook on Materials for Superconducting Machinery”, Metals and Ceramics Information Center, Battelle Laboratories, Columbus, OH (1977).Google Scholar
- 3.“ANSYS Engineering Analysis System User’s Manual,” Swanson Analysis Systems, Inc., Houston, PA (1983).Google Scholar