Theory of gyrotrons with coaxial resonators

Journal Article · Tue Mar 01 04:00:00 EST 1994 · IEEE Transactions on Electron Devices (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/16.275231· OSTI ID:7043812

Nusinovich, G S ^[1]; Dumbrajs, O ^[2]; Kreischer, K E ^[3]; Read, M E

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1. Univ. of Maryland, College Park, MD (United States)
2. Helsinki Univ. of Technology, Espoo (Finland)
3. Massachusetts Inst. of Technology, Cambridge, MA (United States). Plasma Fusion Center

In the development of powerful gyrotrons capable of long-pulse or continuous wave operation the cardinal problem is to provide stable, single-mode highly efficient operation at the desired mode with an acceptable level of ohmic losses in the resonator walls. In the present paper the selective properties of various coaxial resonators as well as ohmic losses of the microwave power in outer and inner conductors are considered. The start-up scenario in powerful gyrotrons is discussed. The results of numerical simulations of a 1 MW, 280-GHz coaxial gyrotron are presented which demonstrate that successive excitation of a number of modes during the voltage rise may not hinder the stable operation of the desired mode on the top of the voltage pulse. An electronic efficiency of 48% is predicted.

• OSTI ID: 7043812
• Journal Information: IEEE Transactions on Electron Devices (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Transactions on Electron Devices (Institute of Electrical and Electronics Engineers); (United States) Vol. 41:3; ISSN 0018-9383; ISSN IETDAI
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426000* -- Engineering-- Components
Electron Devices & Circuits-- (1990-)
AMPLIFIERS
ELECTRONIC EQUIPMENT
ENERGY LOSSES
EQUIPMENT
HEATING
LOSSES
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
MODE SELECTION
PERFORMANCE
POWER LOSSES
RESONATORS
TUNING