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Applied Physics Letters / Volume 83 / Issue 3 / PLASMAS AND ELECTRICAL DISCHARGES

Appl. Phys. Lett. 83, 428 (2003); http://dx.doi.org/10.1063/1.1589164 (3 pages)

Experimental and computational estimate of bipolar flow parameters in an explosive field emission cathode

D. Shiffler1, K. L. Cartwright1, Kim Lawrence1, M. Ruebush1, M. LaCour2, K. Golby2, and D. Zagar3

1Air Force Research Laboratory, Directed Energy Directorate, 3550 Aberdeen SE, Kirtland AFB, New Mexico 87117
2SAIC, 2501 Yale Boulevard, Albuquerque, New Mexico 87106
3Technical Matters, 4 Ojo Chimal, Sandia Park, New Mexico 87047

(Received 27 December 2002; accepted 14 May 2003)

Explosive field emission cathodes constitute an important class of cathodes for high power microwave tubes. These cathodes have the advantages of being light weight and the capability of operating cold. In the past, this class of cathodes suffered from large amounts of outgassing, nonuniform emission, and very high emittance. These effects tended to dominate the diode performance, masking effects due to the anode. However, a type of carbon cathode has enabled the role of the anode in the diode to be better determined. In this letter, we compare experimental results with simulated diode performance, allowing an estimate of the bounds on the secondary emission coefficient from the anode surface as well as the amount of neutral gas liberated from this surface. In general, secondary electrons and neutral atoms lead to plasma formation in high power microwave devices, which in turn deleteriously affect the tube performance. Hence, an estimate of such quantities for use in particle-in-cell codes can prove pivotal for accurate modeling of experimental devices. © 2003 American Institute of Physics.

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KEYWORDS and PACS

Keywords

cathodes, electron field emission, vacuum microelectronics, diodes, microwave tubes, secondary electron emission

PACS

  • 85.45.Db

    Field emitters and arrays, cold electron emitters

  • 84.40.Fe

    Microwave tubes (e.g., klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1589164

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

For access to fully linked references, you need to log in.
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    F. F. Rieke and W. Prepejchal, Phys. Rev. A 6, 1507 (1972).

    J. W. Luginsland, Y. Y. Lau, R. J. Umstattd, and J. J. Watrous, Phys. Plasmas 9, 2371 (2002)PHPAEN000009000005002371000001.


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