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Ion beam formation in a very low magnetic field expanding helicon discharge

Lafleur, T.; Charles, C.; Boswell, R. W.

Description

An ion beam has been measured emerging from a low pressure (0.04 Pa) helicon plasma reactor over a narrow range of magnetic field values (1 mT<B0<3 mT). The presence of the ion beam occurs simultaneously with a large increase in the plasma density for the same applied magnetic field, produced using a single solenoid half the length of the m=1 rfantenna. The peak central plasma density of 1.5×10¹⁷ m⁻³ is measured to be almost 15 times larger than that occurring before or after the increase, and...[Show more]

dc.contributor.authorLafleur, T.
dc.contributor.authorCharles, C.
dc.contributor.authorBoswell, R. W.
dc.date.accessioned2015-12-08T23:41:09Z
dc.date.available2015-12-08T23:41:09Z
dc.identifier.issn1070-664X
dc.identifier.urihttp://hdl.handle.net/1885/38434
dc.description.abstractAn ion beam has been measured emerging from a low pressure (0.04 Pa) helicon plasma reactor over a narrow range of magnetic field values (1 mT<B0<3 mT). The presence of the ion beam occurs simultaneously with a large increase in the plasma density for the same applied magnetic field, produced using a single solenoid half the length of the m=1 rfantenna. The peak central plasma density of 1.5×10¹⁷ m⁻³ is measured to be almost 15 times larger than that occurring before or after the increase, and is associated with a steep axial density gradient which follows the gradient of the magnetic field. During this low magnetic field transition the antenna power transfer efficiency is measured to increase from less than 10% to 50%, suggesting some form of localized bulk electron heating in the source region associated with the helicon wave.
dc.publisherAmerican Institute of Physics (AIP)
dc.rightshttp://www.sherpa.ac.uk/romeo/issn/1070-664X..."Publishers version/PDF may be used on author's personal website, institutional website or institutional repository" from SHERPA/RoMEO site (as at 9/12/15). Copyright (year) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in (citation of published article) and may be found at https://doi.org/
dc.sourcePhysics of Plasmas
dc.subjectKeywords: Applied magnetic fields; Axial density; Bulk electrons; Helicon discharge; Helicon plasma; Helicon waves; Ion-beam formation; Low magnetic fields; Low pressures; Power transfer efficiency; RF antenna; Source region; Antennas; Electric discharges; Helicons
dc.titleIon beam formation in a very low magnetic field expanding helicon discharge
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume17
dc.date.issued2010-04-13
local.identifier.absfor020204
local.identifier.ariespublicationu4735977xPUB33
local.publisher.urlhttps://www.aip.org/
local.type.statusPublished Version
local.contributor.affiliationLafleur, Trevor, 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.bibliographicCitation.issue4
local.bibliographicCitation.startpage043505
local.identifier.doi10.1063/1.3381093
local.identifier.absseo850399
dc.date.updated2016-02-24T11:22:18Z
local.identifier.scopusID2-s2.0-77952367054
local.identifier.thomsonID000277243000063
CollectionsANU Research Publications

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