Measurement of microwave reflexion from a longitudinally magnetized plasma-filled co-axial wave-guideReport as inadecuate




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Reference: M. L. G. Oldfield and R. N. Franklin, (1971). Measurement of microwave reflexion from a longitudinally magnetized plasma-filled co-axial wave-guide. Journal of Plasma Physics, 5 (1), 89-105.Citable link to this page:

 

Measurement of microwave reflexion from a longitudinally magnetized plasma-filled co-axial wave-guide

Abstract: The voltage reflexion coefficient from a vacuum-plasma boundary in a co-axial transmission line with an axial magnetic field B0 applied has been measured. The results agree well with a previously published theory for conditions where the microwave-, plasma-, electron collision-, and electron cyclotron-frequencies are of the same order. A 9 GHz co-axial microwave probe is mounted along the axis of a 44 mm diameter, hydrogen driven, dry air filled, shock tube in an axial d.c. magnetic field. Shock ionized air (Ms=9-14, T 4000°K, electron density nc=1017 to 3x1019m-3, initial pressure p0 = 1-10 Torr, electron collision frequency v = 1010 to 1011/s) fills the coaxial line and partially reflects a microwave signal. Initially this probe, and a similar rectangular waveguide probe, were used with B0 = 0 to calibrate the plasma (nc,v) in terms of the shock tube parameters (p0, Ms). Measurement of the saturated-ion current to electrostatic probes inset into a flat plate in the shock tube flow showed that the sheath-edge ion density is close to the predicted free-stream equilibrium ion density. The apparent ionization potential derived from electrostatic probe results decreased as p0 was reduced from 10 to 1 Torr.

Publication status:PublishedPeer Review status:Peer reviewedVersion:Publisher's version

Bibliographic Details

Publisher: Cambridge University Press

Publisher Website: http://www.cambridge.org/

Host: Journal of Plasma Physicssee more from them

Publication Website: http://journals.cambridge.org/action/displayJournal?jid=PLA

Issue Date: 1971

Copyright Date: 1971

pages:89-105Identifiers

Doi: https://doi.org/10.1017/S0022377800005572

Issn: 0022-3778

Urn: uuid:c5a7d06b-dc27-4113-aebe-e48db2728abc Item Description

Type: Article: post-print;

Language: en

Version: Publisher's versionSubjects: Engineering & allied sciences Tiny URL: ora:6615

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Author: M. L. G. Oldfield - institutionUniversity of Oxford facultyMathematical,Physical and Life Sciences Division - Engineering Science

Source: https://ora.ox.ac.uk/objects/uuid:c5a7d06b-dc27-4113-aebe-e48db2728abc



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