The NRL Ka-band CHI wiggler ubitron amplifier

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:428054

Taccetti, J M; Jackson, R H; Freund, H P; Pershing, D E; Blank, M; Granatstein, V L ^[1]

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1. Naval Research Lab., Washington, DC (United States)

A 35 GHz CHI (Coaxial Hybrid Iron) wiggler ubitron amplifier experiment is under construction at the Naval Research Laboratory. The purpose of the experiment is to study the CHI wiggler configuration`s potential of generating high wiggler magnetic fields at short periods with excellent beam focusing and transport properties. The nominal design parameters of the experiment are a center frequency of 35 GHz, wiggler period of 7.5 mm, and beam voltage of approximately 150 kV. Calculations have shown an intrinsic efficiency of {approx} 7% when operating at 6.3 kG axial field. There appears to be room for further improvement in efficiency, a matter that will be scrutinized more closely in the final design. Components of the experiments include a modified SLAC klystron electron gun (its beam converted from solid to annular), and the input and output rf couplers. Extensive work was performed on the design of the annular beam gun. In addition to the design of the components themselves, their placement in relation to each other in the gun-wiggler region is critical due to space limitation and beam transport issues. The techniques used for beam focusing were also used to study the transport of the beam from the gun output to the wiggler input. The input rf coupler being designed will be a broad band coupler, coupling between two or more rectangular waveguides into the coaxial TE{sub 01} interaction mode. The output coupler will be based on the same design. Results to date are reported.

• OSTI ID: 428054
• Report Number(s): CONF-960634--
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
BEAM TRANSPORT
DESIGN
MICROWAVE AMPLIFIERS
OSCILLATION MODES
PERFORMANCE
WIGGLER MAGNETS