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Title: Experimental investigations of the formation of a plasma mirror for high-frequency microwave beam steering

Abstract

The Naval Research Laboratory (NRL) has been studying the use of a magnetically confined plasma sheet as a reflector for high-frequency (X-band) microwaves for broadband radar applications [IEEE Trans. Plasma Sci. {bold PS}-{bold 19}, 1228 (1991)]. A planar sheet plasma (50 cm{times}60 cm{times}1 cm) is produced using a 2--10 kV fast rise time square wave voltage source and a linear hollow cathode. Reproducible plasma distributions with density {ge}1.2{times}10{sup 12} cm{sup {minus}3} have been formed in a low-pressure (100--500 mTorr of air) chamber located inside of a 100--300 G uniform magnetic field. One to ten pulse bursts of 20--1000 {mu}s duration plasma sheets have been produced with pulse repetition frequencies of up to 10 kHz. Turn on and off times of the plasma are less than 10 {mu}s each. The far-field antenna pattern of microwaves reflected off the plasma sheet is similar to that from a metal plate at the same location [IEEE Trans. Plasma Sci {bold PS}-{bold 20}, 1036 (1992)]. Interferometer measurements show the critical surface to remain nearly stationary during the current pulse. Plasma density measurements and optical emissions indicate that the plasma is produced by a flux of energetic electrons formed near the hollow cathode. The sheet appearsmore » to be stable to driver voltage and current fluctuations (NRL Memorandum Report No. 7461, 28 March 1994, NTIS Document No. AD-A278758). {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.« less

Authors:
; ; ; ; ; ;  [1]
  1. Plasma Physics Division, Naval Research Laboratory, Washington, D.C. 20375-5346 (United States)
Publication Date:
OSTI Identifier:
165308
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 2; Journal Issue: 6; Other Information: PBD: Jun 1995
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; PLASMA SHEATH; MICROWAVE RADIATION; ELECTRIC DISCHARGES; PLASMA PRODUCTION; PLASMA DENSITY; HOLLOW CATHODES; MAGNETIC CONFINEMENT; BEAM-PLASMA SYSTEMS; ANTENNAS

Citation Formats

Meger, R A, Mathew, J, Gregor, J A, Pechacek, R E, Fernsler, R F, Manheimer, W, and Robson, A E. Experimental investigations of the formation of a plasma mirror for high-frequency microwave beam steering. United States: N. p., 1995. Web. doi:10.1063/1.871215.
Meger, R A, Mathew, J, Gregor, J A, Pechacek, R E, Fernsler, R F, Manheimer, W, & Robson, A E. Experimental investigations of the formation of a plasma mirror for high-frequency microwave beam steering. United States. doi:10.1063/1.871215.
Meger, R A, Mathew, J, Gregor, J A, Pechacek, R E, Fernsler, R F, Manheimer, W, and Robson, A E. Thu . "Experimental investigations of the formation of a plasma mirror for high-frequency microwave beam steering". United States. doi:10.1063/1.871215.
@article{osti_165308,
title = {Experimental investigations of the formation of a plasma mirror for high-frequency microwave beam steering},
author = {Meger, R A and Mathew, J and Gregor, J A and Pechacek, R E and Fernsler, R F and Manheimer, W and Robson, A E},
abstractNote = {The Naval Research Laboratory (NRL) has been studying the use of a magnetically confined plasma sheet as a reflector for high-frequency (X-band) microwaves for broadband radar applications [IEEE Trans. Plasma Sci. {bold PS}-{bold 19}, 1228 (1991)]. A planar sheet plasma (50 cm{times}60 cm{times}1 cm) is produced using a 2--10 kV fast rise time square wave voltage source and a linear hollow cathode. Reproducible plasma distributions with density {ge}1.2{times}10{sup 12} cm{sup {minus}3} have been formed in a low-pressure (100--500 mTorr of air) chamber located inside of a 100--300 G uniform magnetic field. One to ten pulse bursts of 20--1000 {mu}s duration plasma sheets have been produced with pulse repetition frequencies of up to 10 kHz. Turn on and off times of the plasma are less than 10 {mu}s each. The far-field antenna pattern of microwaves reflected off the plasma sheet is similar to that from a metal plate at the same location [IEEE Trans. Plasma Sci {bold PS}-{bold 20}, 1036 (1992)]. Interferometer measurements show the critical surface to remain nearly stationary during the current pulse. Plasma density measurements and optical emissions indicate that the plasma is produced by a flux of energetic electrons formed near the hollow cathode. The sheet appears to be stable to driver voltage and current fluctuations (NRL Memorandum Report No. 7461, 28 March 1994, NTIS Document No. AD-A278758). {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.},
doi = {10.1063/1.871215},
journal = {Physics of Plasmas},
number = 6,
volume = 2,
place = {United States},
year = {1995},
month = {6}
}