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Transport of ion beam in an annular magnetically expanding helicon double layer thruster

Zhang, Yunchao; Charles, Christine; Boswell, Rod

Description

An ion beam generated by an annular double layer has been measured in a helicon thruster, which sustains a magnetised low-pressure (5.0 104 Torr) argon plasma at a constant radio-frequency (13.56 MHz) power of 300 W. After the ion beam exits the annular structure, it merges into a solid centrally peaked structure in the diffusion chamber. As the annular ion beam moves towards the inner region in the diffusion chamber, a reversed-cone plasma wake (with a half opening angle of about 30 ) is...[Show more]

dc.contributor.authorZhang, Yunchao
dc.contributor.authorCharles, Christine
dc.contributor.authorBoswell, Rod
dc.date.accessioned2015-12-07T01:38:26Z
dc.date.available2015-12-07T01:38:26Z
dc.identifier.issn1070-664X
dc.identifier.urihttp://hdl.handle.net/1885/17052
dc.description.abstractAn ion beam generated by an annular double layer has been measured in a helicon thruster, which sustains a magnetised low-pressure (5.0 104 Torr) argon plasma at a constant radio-frequency (13.56 MHz) power of 300 W. After the ion beam exits the annular structure, it merges into a solid centrally peaked structure in the diffusion chamber. As the annular ion beam moves towards the inner region in the diffusion chamber, a reversed-cone plasma wake (with a half opening angle of about 30 ) is formed. This process is verified by measuring both the radial and axial distributions of the beam potential and beam current. The beam potential changes from a two-peak radial profile (maximum value 30 V, minimum value 22.5 V) to a flat ( 28 V) along the axial direction; similarly, the beam current changes from a two-peak to one-peak radial profile and the maximum value decreases by half. The inward cross-magnetic-field motion of the beam ions is caused by a divergent electric field in the source. Cross-field diffusion of electrons is also observed in the inner plume and is determined as being of non-ambipolar origin.
dc.format5 pages
dc.publisherAmerican Institute of Physics (AIP)
dc.rights© 2014 AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Physics of Plasmas and may be found at http://doi.org/10.1063/1.4885350 http://publishing.aip.org/authors/copyright-reuse http://www.sherpa.ac.uk/romeo/issn/1070-664X Author can archive publisher's version/PDF (Sherpa/Romeo as of 7/12/2015).
dc.sourcePhysics of Plasmas
dc.subjection beam
dc.subjectannular double layer
dc.subjecthelicon thruster
dc.subjectmagnetised low-pressure (5.0 104 Torr) argon plasma
dc.subjectradio-frequency (13.56 MHz)
dc.subject300 W
dc.titleTransport of ion beam in an annular magnetically expanding helicon double layer thruster
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume21
dcterms.dateAccepted2014-06-11
dc.date.issued2014
local.identifier.absfor020204
local.identifier.ariespublicationu4695161xPUB120
local.publisher.urlhttps://www.aip.org/
local.type.statusPublished Version
local.contributor.affiliationZhang, Yunchao, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Plasma Research Laboratory, The Australian National University
local.contributor.affiliationCharles, Christine, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Plasma Research Laboratory, The Australian National University
local.contributor.affiliationBoswell, Roderick, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Plasma Research Laboratory, The Australian National University
local.identifier.essn1089-7674
local.bibliographicCitation.issue6
local.bibliographicCitation.startpage063511
local.bibliographicCitation.lastpage5
local.identifier.doi10.1063/1.4885350
dc.date.updated2015-12-08T09:46:57Z
local.identifier.scopusID2-s2.0-84903480006
local.identifier.thomsonID000338995300109
CollectionsANU Research Publications

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