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Proceedings Paper

Proof-Of-Principle Experiment For A Sheet-Beam, Near-Millimeter, Free Electron Laser With Output Power Up To 1 Megawatt
Author(s): J. H. Booske; T. M. Antonsen Jr.; Y. Carmel; W. W. Destler; J. Finn; V. L. Granatstein; P. E. Latham; B. Levush; I. D. Mayergoyz; D. Radack
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Paper Abstract

The use of a small period wiggler (ℓw < 1 cm) together with a sheet electron beam has been proposed as a low cost source of power for electron cyclotron resonance heating (ECRH) in magnetic fusion plas-mas and for space-based radar systems. We have experimentally demonstrated stable propagation of a sheet beam (18 A, 1 mm x 20 mm) through a ten-period wiggler electromagnet with peak field of 1.2 kG. Calculation of microwave wall heating and pressurized water cooling have also been carried out, and indicate the feasibility of operating a near-millimeter, sheet beam FEL with an output power of 1 MW CW (corresponding to power density into the walls of 2 kW/cm2). Based on these encouraging results, a proof-of-principle experiment is being assembled, and is aimed at demonstrating FEL operating at 120 GHz with 300 kW output power in 1 μs pulses; electron energy would be 410 keV. Preliminary design of a 300 GHz, 1 MW FEL with an untapered wiggler is also presented. Finally, a method of modulating high power CW signals for radar applications is suggested.

Paper Details

Date Published: 25 July 1989
PDF: 9 pages
Proc. SPIE 1061, Microwave and Particle Beam Sources and Directed Energy Concepts, (25 July 1989); doi: 10.1117/12.951808
Show Author Affiliations
J. H. Booske, University of Maryland (United States)
T. M. Antonsen Jr., University of Maryland (United States)
Y. Carmel, University of Maryland (United States)
W. W. Destler, University of Maryland (United States)
J. Finn, University of Maryland (United States)
V. L. Granatstein, University of Maryland (United States)
P. E. Latham, University of Maryland (United States)
B. Levush, University of Maryland (United States)
I. D. Mayergoyz, University of Maryland (United States)
D. Radack, University of Maryland (United States)

Published in SPIE Proceedings Vol. 1061:
Microwave and Particle Beam Sources and Directed Energy Concepts
Howard E. Brandt, Editor(s)

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