Theory of a ubitron in a corrugated waveguide
- Naval Research Lab., Washington, DC (United States)
A K{sub a} band ubitron amplifier is currently under development at NRL utilizing grazing intersection for wide instantaneous bandwidth, circularly polarized wiggler and microwave fields for high gain and power, and a high quality Pierce gun generating a cylindrical, uniform density electron beam for high efficiency. The dispersion characteristics of a periodic waveguide can be exploited for low voltage ubitron operation. Operation in the HE{sub 11} mode of a corrugated cylindrical waveguide permits broader bandwidth amplification at lower voltages than is possible with a smooth waveguide. While the wave is slower than the smooth waveguide dispersion characteristic, the amplifier still operates on the fundamental space harmonic as a fast-wave device. An extensive investigation of several waveguide/wiggler geometries has been completed. Preliminary calculations using a dielectrically loaded corrugated waveguide indicate that 20% bandwidth operation in K{sub a} band is possible at voltages {approximately} 150 kV with a 8--9 mm period wiggler generating a 930 G transverse magnetic field. Design details and performance calculations using the 3-D nonlinear code TARANTULA will be presented.
- Sponsoring Organization:
- Office of Naval Research, Washington, DC (United States)
- OSTI ID:
- 435469
- Report Number(s):
- CONF-960634-; TRN: IM9710%%127
- Resource Relation:
- Conference: 1996 IEEE international conference on plasma science, Boston, MA (United States), 3-5 Jun 1996; Other Information: PBD: 1996; Related Information: Is Part Of IEEE conference record -- Abstracts: 1996 IEEE international conference on plasma science; PB: 324 p.
- Country of Publication:
- United States
- Language:
- English
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