Recommendations for a cryogenic system for ITER

A conceptual design for a cryogenic system that meets the International Thermonuclear Experimental Reactor (ITER) requirements is presented. The system has the following features: (a) only time-proven components are used, (b) a high efficiency is obtained without using cold pumps or other developmental components, (c) high reliability is achieved by paralleling compressors and expandors and by using adequate valving, (d) the problem of load fluctuations is solved by a simple load-leveling device and (e) the system can be housed in a separate building located at a considerable distance from the ITER core, if desired. The physical plant size, cost estimates, and means of handling vented helium during a magnet quench are summarized