Development of multi-purpose MW gyrotrons for fusion devices

作者：Minami R^*; Kariya T; Imai T; Numakura T; Endo Y; Nakabayashi H; Eguchi T; Shimozuma T; Kubo S; Yoshimura Y; Igami H; Takahashi H; Mutoh T; Ito S; Idei H; Zushi H; Yamaguchi Y; Sakamoto K; Mitsunaka Y

来源：Nuclear Fusion, 2013, 53(6): UNSP 063003.

DOI：10.1088/0029-5515/53/6/063003

The latest development achievements in the University of Tsukuba of over-1MW power level gyrotrons required in present-day fusion devices, GAMMA 10, Large Helical Device (LHD), QUEST, Heliotron J and NSTX, are presented. The obtained maximum outputs are 1.9MW for 0.1 s on the 77 GHz LHD tube and 1.2MW for 1ms on the 28 GHz GAMMA 10 one, which are new records in these frequency ranges. In long-pulse operation, 0.3 MW for 40 min at 77 GHz and 0.54 MW for 2 s at 28 GHz are achieved. A new programme of 154 GHz 1MW development has started for high-density plasma heating in LHD. On the first 154 GHz tube, 1.0MW for 1 s is achieved. As a next activity of the 28 GHz gyrotron, an over-1.5MW gyrotron is designed and fabricated to study the multi-MW oscillation. The possibility of 0.4MW continuous wave and 2MW level output in operations of a few seconds, after the improvements of output window and mode converter, is shown. Moreover, a new design study of dual-frequency gyrotron at 28 and 35 GHz has started, which indicates the practicability of the multi-purpose gyrotron.

• 出版日期2013-6