Systematic cavity design approach for a multi-frequency gyrotron for DEMO and study of its RF behavior

Journal Article · Thu Sep 15 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4962238· OSTI ID:22599865

Avramidis, K. A.; Franck, J.; Gantenbein, G.; Illy, S.; Pagonakis, I. Gr. ^[1]; Thumm, M.; Jelonnek, J. ^[1]

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1. Institute for Pulsed Power and Microwave Technology (IHM), Karlsruhe Institute of Technology (KIT), Karlsruhe (Germany)

High frequency (>230 GHz) megawatt-class gyrotrons are planned as RF sources for electron cyclotron resonance heating and current drive in DEMOnstration fusion power plants (DEMOs). In this paper, for the first time, a feasibility study of a 236 GHz DEMO gyrotron is presented by considering all relevant design goals and the possible technical limitations. A mode-selection procedure is proposed in order to satisfy the multi-frequency and frequency-step tunability requirements. An effective systematic design approach for the optimal design of a gradually tapered cavity is presented. The RF-behavior of the proposed cavity is verified rigorously, supporting 920 kW of stable output power with an interaction efficiency of 36% including the considerations of realistic beam parameters.

• OSTI ID: 22599865
• Journal Information: Physics of Plasmas, Vol. 23, Issue 9; Other Information: (c) 2016 EURATOM; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CAVITY RESONATORS
CYCLOTRONS
DESIGN
ECR HEATING
ELECTRON CYCLOTRON-RESONANCE
ELECTRONS
FEASIBILITY STUDIES
GHZ RANGE 100-1000
MICROWAVE AMPLIFIERS
MODE SELECTION
THERMONUCLEAR POWER PLANTS