A CHI wiggler ubitron amplifier experiment: Wiggler characterization

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:153880

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). Vacuum Electronics Branch

A 35 GHz CHI (Coaxial Hybrid Iron) wiggler ubitron amplifier experiment is under construction at the Naval Research Laboratory. The CHI wiggler configuration has the potential of generating high wiggler magnetic fields at short periods with excellent beam focusing and transport properties. This makes it a desirable configuration for the generation of high power coherent radiation in relatively compact systems. The principle goals of the experiment are to investigate the performance tradeoffs involved in the CHI configuration for high frequency amplifiers operating at low voltages with small wiggler periods. Calculations have shown an intrinsic (untapered) efficiency of {approx} 7% when operating at 6.3 kG axial field (wiggler field, B{sub w} {approx} 1,270 G). The calculated gain was 36 dB, saturating at a distance of 46 cm. These parameters yield an instantaneous amplifier bandwidth of {approx} 25%. There appears to be room for further improvement in efficiency, a matter which will be scrutinized more closely in the final design. A prototype CHI wiggler is presently being fabricated for use in conjunction with an existing 30 kG superconducting solenoid. The performance properties of the prototype will be characterized and compared with linear and non-linear calculations. An electron gun is being designed to generate a 150 kV, 35 A annular electron beam. It will use components from a SLAC klystron gun with modified cathode and anode structures. Results to date will be presented.

• OSTI ID: 153880
• Report Number(s): CONF-950612--; ISBN 0-7803-2669-5
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
BEAM PRODUCTION
BEAM TRANSPORT
DESIGN
ELECTRON BEAMS
MICROWAVE AMPLIFIERS
PERFORMANCE
SUPERCONDUCTING MAGNETS
WIGGLER MAGNETS