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Effect of plasma formation on electron pinching and microwave emission in a virtual cathode oscillator

Abstract

Time and spatial evolutions of anode and cathode plasmas in a vircator diode were observed with a streak camera. A cathode plasma appeared immediately after the rise of a beam current and was followed by an anode plasma typically after about 30 ns. Both plasmas expanded with almost the same speed of order of 104 m/s. The anode plasma was confirmed as a hydrogen plasma with an optical filter for H{sub {beta}} line and study of anode-temperature rise. Electron beam pinching immediately followed by microwave emission was observed at the beam current less than the critical current for diode pinching in the experiment and the simulation. The electron beam current in the diode region is well characterized by the electron space-charge-limited current in bipolar flow with the expanding plasmas between the anode-cathode gap. As a result, electron bombardment produced the anode plasma, which made the electron beam strongly pinched, resulting in virtual cathode formation and microwave emission. (author). 5 figs., 5 refs.
Authors:
Yatsuzuka, M; Nakayama, M; Nobuhara, S; [1]  Young, D; Ishihara, O [2] 
  1. Himeji Institute of Technology (Japan)
  2. Texas Tech Univ., Lubbock, TX (United States)
Publication Date:
Dec 31, 1996
Product Type:
Conference
Report Number:
INIS-CZ-0002; CONF-960610-
Reference Number:
SCA: 661220; PA: AIX-28:055642; EDB-97:113959; SN: 97001834647
Resource Relation:
Conference: BEAMS `96: 11. international conference on high-power particle beams, Prague (Czech Republic), 10-14 Jun 1996; Other Information: PBD: 1996; Related Information: Is Part Of Beams `96. Proceedings of the 11th international conference on high power particle beams. Vol. I; Jungwirth, K.; Ullschmied, J. [eds.]; PB: [684] p.
Subject:
66 PHYSICS; ELECTRON BEAMS; BEAM DYNAMICS; ANODES; BEAM PRODUCTION; CATHODES; MICROWAVE RADIATION; PLASMA EXPANSION
OSTI ID:
511055
Research Organizations:
Ceskoslovenska Akademie Ved, Prague (Czech Republic). Ustav Fyziky Plazmatu
Country of Origin:
Czech Republic
Language:
English
Other Identifying Numbers:
Other: ON: DE97637662; ISBN 80-902250-3-9; TRN: CZ9726757055642
Availability:
INIS; OSTI as DE97637662
Submitting Site:
INIS
Size:
pp. 481-484
Announcement Date:

Citation Formats

Yatsuzuka, M, Nakayama, M, Nobuhara, S, Young, D, and Ishihara, O. Effect of plasma formation on electron pinching and microwave emission in a virtual cathode oscillator. Czech Republic: N. p., 1996. Web.
Yatsuzuka, M, Nakayama, M, Nobuhara, S, Young, D, & Ishihara, O. Effect of plasma formation on electron pinching and microwave emission in a virtual cathode oscillator. Czech Republic.
Yatsuzuka, M, Nakayama, M, Nobuhara, S, Young, D, and Ishihara, O. 1996. "Effect of plasma formation on electron pinching and microwave emission in a virtual cathode oscillator." Czech Republic.
@misc{etde_511055,
title = {Effect of plasma formation on electron pinching and microwave emission in a virtual cathode oscillator}
author = {Yatsuzuka, M, Nakayama, M, Nobuhara, S, Young, D, and Ishihara, O}
abstractNote = {Time and spatial evolutions of anode and cathode plasmas in a vircator diode were observed with a streak camera. A cathode plasma appeared immediately after the rise of a beam current and was followed by an anode plasma typically after about 30 ns. Both plasmas expanded with almost the same speed of order of 104 m/s. The anode plasma was confirmed as a hydrogen plasma with an optical filter for H{sub {beta}} line and study of anode-temperature rise. Electron beam pinching immediately followed by microwave emission was observed at the beam current less than the critical current for diode pinching in the experiment and the simulation. The electron beam current in the diode region is well characterized by the electron space-charge-limited current in bipolar flow with the expanding plasmas between the anode-cathode gap. As a result, electron bombardment produced the anode plasma, which made the electron beam strongly pinched, resulting in virtual cathode formation and microwave emission. (author). 5 figs., 5 refs.}
place = {Czech Republic}
year = {1996}
month = {Dec}
}