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Original work on heat transfer by circulations of supercritical helium for cooling superconducting cables was done in this laboratory in 1965 by Kolm et al [1]. Two recent papers[2,3] have described the computer program for which experimental verification is being sought. The pros and cons of a hollow-conductor system have also been discussed in these pubications.

The term “hybrid” magnet has been coined to describe coils in which part of the field is generated by superconductors and part by non-superconductors. Such systems have the advantage in that they can produce higher fields than can be produced by either of their parts alone. In addition, they can represent a rather economical approach to very high fields for laboratories that already possess either power supplies or refrigerators of reasonable capacity.