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Power-bandwidth extension in a high power, s-band multiple-beam klystron

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4 Author(s)
Nguyen, K.T. ; Beam-Wave Res., Inc., Bethesda, MD ; Pershing, D.E. ; Abe, D.K. ; Levush, B.

Summary form only given. We present the design of a broadband multiple-beam klystron (MBK) capable of generating >700 kW of peak RF power with a 3-dB instantaneous bandwidth of >11% at a center frequency of ~3.3 GHz. The MBK will operate in the TM01 fundamental-mode and is designed to be powered by an 18-beam, 42 kV, 41.6 A electron gun that is currently in fabrication. The gun employs a concentric beam-packing topology of 6 inner and 12 outer beamlets, each with an emitter current density of ~11 A/cm2. The electrodynamic circuit is comprised of six cavities with an overall length of 22 cm. Three of the six cavities are of a two-gap design, with inherently higher R/Q's as compared to single-gap cavities, thus enabling broader bandwidth operation and higher power and gain in a shorter interaction length. We will describe our design methodology, including the development of analytic design aids, discuss design trade-offs, and present final circuit parameters along with the results of 3-D particle-in-cell simulations of realistic circuit topologies

Published in:

Plasma Science, 2006. ICOPS 2006. IEEE Conference Record - Abstracts. The 33rd IEEE International Conference on

Date of Conference:

4-8 June 2006