NDLI: Suppression of the transit -time instability in large-area electron beam diodes

Content Provider	IEEE Xplore Digital Library
Author	Myers, Matthew C. Friedman, Moshe Swanekamp, Stephen B. Chan, Lop-Yung Ludeking, Larry Sethian, John D.
Copyright Year	2002
Description	Author affiliation: Science Applications International Corporation, McLean, VA 22102, USA (Chan, Lop-Yung) \|\| Mission Research Corporation, Newington, VA 22122, USA (Ludeking, Larry) \|\| Naval Research Laboratory, Laser Plasma Branch, Washington, D.C. 20375, USA (Myers, Matthew C.; Friedman, Moshe; Sethian, John D.) \|\| JAYCOR, McLean, VA 22102, USA (Swanekamp, Stephen B.)
Abstract	Experiment, theory, and simulation have shown that large-area electron-beam diodes are susceptible to the transit-time instability. The instability modulates the electron beam spatially and temporally, producing a wide spread in electron energy and momentum distributions. The result is gross inefficiency in beam generation and propagation. Simulations indicate that a periodic, slotted cathode structure that is loaded with resistive elements may be used to eliminate the instability. Such a cathode has been fielded on one of the two opposing 60 cm × 200 cm diodes on the NIKE KrF laser at the Naval Research Laboratory. These diodes typically deliver 600 kV, 500 kA, 250 ns electron beams to the laser cell in an external magnetic field of 0.2 T. We conclude that the slotted cathode suppressed the transit-time instability such that the RF power was reduced by a factor of 9 and that electron transmission efficiency into the laser gas was improved by more than 50%.
Starting Page	231
Ending Page	234
File Size	548809
Page Count	4
File Format	PDF
ISBN	9780735401075
ISSN	0094243X
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-06-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	AIP
Subject Keyword	Lasers Measurement by laser beam Weaving Generators Laser beams Thickness measurement
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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