NDLI: Superconducting magnets for gyrotron tubes

Content Provider	IEEE Xplore Digital Library
Author	Hsu, Y. Purcell, J. Prater, R.
Copyright Year	1965
Abstract	Six superconducting magnet systems have been designed and built for gyrotron tubes furnished by Varian. The systems are being installed on the General Atomic Doublet III Tokamak Fusion Device for radio frequency heating. They will initially operate at 60 GHz requiring a 2.5 T field, but the magnets can be operated to 5 T for possible upgrade to 120 GHz. Key design features include high precision coil winding, high precision coil positioning (concentric with bore), low helium boil-off rate, and a one week operating time without refilling. A low operating current of 7 A for 60 GHz operation was selected for reducing the heat leak through the power leads. Aluminum tape and superinsulation are utilized to decrease the radiation heat leak. The overall dimensional constraint makes it difficult to keep the helium boil-off rate very low. Two systems have been operated with 60 GHz gyrotron tubes. The tubes have been brought up to full power and the performance of the magnet is satisfactory. The average liquid helium boil-off rate is 0.4 l/hr, i.e., liquid helium will last for six days without refilling. The liquid nitrogen cooled thermal shield must be refilled every three days. The detailed design, construction, and testing results are presented.
Sponsorship	IEEE Magnetics Society
Starting Page	365
Ending Page	367
Page Count	3
File Size	228642
File Format	PDF
ISSN	00189464
Volume Number	19
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1983-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Superconducting magnets Gyrotrons Coils Atomic measurements Tokamaks Radio frequency Heating Boring Aluminum
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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