High-efficiency oscillation of 170 GHz high-power gyrotron at TE31,8 mode using depressed collector

Authors
Shoyama, H Sakamoto, K Hayashi, K Kasugai, A Tsuneoka, N Takahashi, K Ikeda, Y Kariya, T Mitsunaka, Y Imai, T
Citation
H. Shoyama et al., High-efficiency oscillation of 170 GHz high-power gyrotron at TE31,8 mode using depressed collector, JPN J A P 2, 40(8B), 2001, pp. L906-L908
Citations number
11
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS → ACNP
Volume
40
Issue
8B
Year of publication
2001
Pages
L906 - L908
Database
ISI
SICI code
Abstract
Stable 1.1 MW oscillation was achieved by a 170 GHz high power gyrotron. Th e oscillation mode capable of the CW operation is TE31.8. The efficiency wa s 32%, which was enhanced to 57% by a depressed-col lector operation. The p arasitic oscillation in a beam tunnel (a beam drifting tube between an elec tron gun and a cavity) that degraded the oscillation efficiency was suppres sed by installing an RF absorber. This result has a large impact on the dev elopment of a 1-MW-long-pulse gyrotron that is required for fusion devices.