The Triaxial Klystron

Journal Article · Sat May 01 04:00:00 EDT 1999 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.59025· OSTI ID:690667

Pasour, J; Smithe, D ^[1]; Friedman, M ^[2]

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1. Mission Research Corporation, 8560 Cinderbed Rd., Newington, Virginia 22122 (United States)
2. Naval Research Laboratory, 4555 Overlook Ave., SW, Washington, District of Columbia 20375 (United States)

We describe a high-power, annular beam klystron, the Triaxial Klystron, that promises high efficiency at GW power levels and frequencies up to X band. Higher frequency operation should be possible at reduced power levels. The device consists of a thin annular electron beam propagating in an annular drift region, with cavity structures located inside and outside the beam. So long as the width of the drift region is less than half a wavelength (to cut off TM modes), the beam diameter can be as large as necessary to accommodate the required current and to reduce the RF surface fields to tolerable levels. Beam transport and stability are also facilitated in the annular channel. Simulations at X-band (using MRC{close_quote}s particle-in-cell code, MAGIC) show strong beam bunching and efficient energy extraction from specially designed radial cavity structures. Initial experiments at the Naval Research Laboratory have demonstrated transport of a 16-kA, 400-keV beam over a distance of {approximately}1 m with no evidence of instability or asymmetry. Strong bunching of such a beam has been produced at X band using a coaxially-driven input cavity and a multi-gap buncher cavity structure. The peak-to-peak modulated current amplitude from this simple structure exceeds the injected current amplitude and is stable throughout the 150 nsec pulse. {copyright} {ital 1999 American Institute of Physics.}

• Sponsoring Organization: USDOE
• OSTI ID: 690667
• Report Number(s): CONF-981099--
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 474; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
AMPLIFICATION
CAVITY RESONATORS
COMPUTERIZED SIMULATION
DESIGN
ELECTRIC CURRENTS
ELECTRON BEAMS
EXPERIMENTAL DATA
GAIN
KLYSTRONS
MICROWAVE AMPLIFIERS
RELATIVISTIC RANGE
SIMULATION
TESTING