Development of 7 T Cryogen-free superconducting magnet for gyrotron

Hirose, Ryoichi*; Kamikado, Takeshi*; Okui, Yoshio*; Miyata, Hitoshi*; Shibutani, Kazuyuki*; Ozaki, Osamu*; Sakamoto, Keishi

A special type of 7 T 240 mm vertical bore cryogen-free superconducting magnet system was developed. The magnet system consists of three sets of coils which are charged separately. A set of sweep coils are located inside of the main coil. The sweep coil produces only 0.2 T but is charged and discharged within 10 seconds so as to control electron trajectory. To avoid quench with the rise of the temperature from the large AC loss, this set of coils are wound with Nb $_{3}$ Sn conductor. This magnet system will contribute to the fast control of the gyrotron oscillation frequency.

Language	:	English
Journal	:	IEEE Transactions on Applied Superconductivity
Volume	:	18
Number	:	2
Pages	:	p.920 - 923
Publication Year/Month	:	2008/06
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Paper URL	:	https://doi.org/10.1109/TASC.2008.922296
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Keywords	:	no keyword
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Registration No. : AA20080448
JAEA Abstracts No. :
Paper Submission No. : 7480

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