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Title: Efficiency enhancement of high power vacuum BWO's using nonuniform slow wave structures

Abstract

The Sinus-6, a high-power relativistic repetitively-pulsed electron beam accelerator, is used to drive various slow wave structures in a BWO configuration in vacuum. Peak output power of about 550 MW at 9.45 GHz was radiated in an 8-ns pulse. The authors describe experiments which study the relative efficiencies of microwave generation from a two-stage nonuniform amplitude slow wave structure and its variations without an initial stage. Experimental results are compared with 2.5 D particle-in-cell computer simulations. The results suggest that prebunching the electron beam in the initial section of the nonuniform BWO results in increased microwave generation efficiency. Furthermore, simulations reveal that, in addition to the backward propagating surface harmonic of the TM[sub 01] mode, backward and forward propagating volume harmonics with phase velocity twice that of the surface harmonic play an important role in high-power microwave generation and radiation.

Authors:
;  [1];  [2]; ; ;  [3]; ;  [4]
  1. Univ. of New Mexico, Albuquerque, NM (United States). Pulsed Power and Plasma Science Lab.
  2. Sandia National Labs., Albuquerque, NM (United States)
  3. Russian Academy of Sciences, Tomsk (Russian Federation). Inst. of High Current Electronics
  4. Air Force Material Command, Kirtland AFB, NM (United States). Advanced Weapons and Survivability Directorate
Publication Date:
OSTI Identifier:
6535551
Resource Type:
Journal Article
Journal Name:
IEEE Transactions on Plasma Science (Institute of Electrical and Electronics Engineers); (United States)
Additional Journal Information:
Journal Volume: 22:5; Journal ID: ISSN 0093-3813
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; BACKWARD WAVE TUBES; DESIGN; EFFICIENCY; BEAM BUNCHING; COMPARATIVE EVALUATIONS; EXPERIMENTAL DATA; OSCILLATION MODES; BEAM DYNAMICS; DATA; ELECTRON TUBES; ELECTRONIC EQUIPMENT; EQUIPMENT; EVALUATION; INFORMATION; MICROWAVE EQUIPMENT; MICROWAVE TUBES; NUMERICAL DATA; 426000* - Engineering- Components, Electron Devices & Circuits- (1990-)

Citation Formats

Moreland, L D, Schamiloglu, E, Lemke, R W, Korovin, S D, Rostov, V V, Roitman, A M, Hendricks, K J, and Spencer, T A. Efficiency enhancement of high power vacuum BWO's using nonuniform slow wave structures. United States: N. p., 1994. Web. doi:10.1109/27.338268.
Moreland, L D, Schamiloglu, E, Lemke, R W, Korovin, S D, Rostov, V V, Roitman, A M, Hendricks, K J, & Spencer, T A. Efficiency enhancement of high power vacuum BWO's using nonuniform slow wave structures. United States. https://doi.org/10.1109/27.338268
Moreland, L D, Schamiloglu, E, Lemke, R W, Korovin, S D, Rostov, V V, Roitman, A M, Hendricks, K J, and Spencer, T A. 1994. "Efficiency enhancement of high power vacuum BWO's using nonuniform slow wave structures". United States. https://doi.org/10.1109/27.338268.
@article{osti_6535551,
title = {Efficiency enhancement of high power vacuum BWO's using nonuniform slow wave structures},
author = {Moreland, L D and Schamiloglu, E and Lemke, R W and Korovin, S D and Rostov, V V and Roitman, A M and Hendricks, K J and Spencer, T A},
abstractNote = {The Sinus-6, a high-power relativistic repetitively-pulsed electron beam accelerator, is used to drive various slow wave structures in a BWO configuration in vacuum. Peak output power of about 550 MW at 9.45 GHz was radiated in an 8-ns pulse. The authors describe experiments which study the relative efficiencies of microwave generation from a two-stage nonuniform amplitude slow wave structure and its variations without an initial stage. Experimental results are compared with 2.5 D particle-in-cell computer simulations. The results suggest that prebunching the electron beam in the initial section of the nonuniform BWO results in increased microwave generation efficiency. Furthermore, simulations reveal that, in addition to the backward propagating surface harmonic of the TM[sub 01] mode, backward and forward propagating volume harmonics with phase velocity twice that of the surface harmonic play an important role in high-power microwave generation and radiation.},
doi = {10.1109/27.338268},
url = {https://www.osti.gov/biblio/6535551}, journal = {IEEE Transactions on Plasma Science (Institute of Electrical and Electronics Engineers); (United States)},
issn = {0093-3813},
number = ,
volume = 22:5,
place = {United States},
year = {Sat Oct 01 00:00:00 EDT 1994},
month = {Sat Oct 01 00:00:00 EDT 1994}
}