Experiments and theory of an upstream ionization instability excited by an accelerated electron beam through a current-free double layer
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Aanesland, Ane; Lieberman, M. A.; Charles, C.; Boswell, R. W.
Description
A low-frequency instability varying from 10 to 20kHz has been discovered in the presence of a current-free double layer (DL) in a low-pressure expanding helicon plasma. The instability is observed using various electrostatic probes, such as Langmuir probes floating or biased to ion saturation and emissive probes measuring the plasma potential. A retarding field energy analyzer measuring the ion energy distribution function downstream of the double layer is used together with the LP to...[Show more]
dc.contributor.author | Aanesland, Ane | |
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dc.contributor.author | Lieberman, M. A. | |
dc.contributor.author | Charles, C. | |
dc.contributor.author | Boswell, R. W. | |
dc.date.accessioned | 2015-11-06T03:52:47Z | |
dc.date.available | 2015-11-06T03:52:47Z | |
dc.identifier.issn | 1070-664X | |
dc.identifier.uri | http://hdl.handle.net/1885/16395 | |
dc.description.abstract | A low-frequency instability varying from 10 to 20kHz has been discovered in the presence of a current-free double layer (DL) in a low-pressure expanding helicon plasma. The instability is observed using various electrostatic probes, such as Langmuir probes floating or biased to ion saturation and emissive probes measuring the plasma potential. A retarding field energy analyzer measuring the ion energy distribution function downstream of the double layer is used together with the LP to simultaneously observe the DL and the instability, confirming their coexistence. The frequency of the instability decreases with increasing neutral pressure, increases with increasing magnetic field in the source and increases with increasing rf power. A theory for an upstream ionizationinstability has been developed, in which electrons accelerated through the DL increase the ionization upstream and are responsible for the observed instability. The theory is in good agreement with the experimental results and shows that the frequency increases with the potential drop of the double layer and with decreasing chamber radius. | |
dc.publisher | American Institute of Physics (AIP) | |
dc.rights | http://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 6/11/15). Copyright 2006 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 Physics of Plasmas and may be found at https://doi.org/10.1063/1.2398929 | |
dc.source | Physics of Plasmas | |
dc.subject | Keywords: Current free double layers; Ion saturation; Langmuir probes; Upstream ionization instability; Electron beams; Electrostatics; Helicons; Magnetic fields; Natural frequencies; Plasma probes; Stability; Ionization | |
dc.title | Experiments and theory of an upstream ionization instability excited by an accelerated electron beam through a current-free double layer | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 13 | |
dc.date.issued | 2006-12-06 | |
local.identifier.absfor | 020204 | |
local.identifier.ariespublication | u4048219xPUB6 | |
local.publisher.url | https://www.aip.org/ | |
local.type.status | Published Version | |
local.contributor.affiliation | Aanesland, Ane, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Plasma Research Laboratory, The Australian National University | |
local.contributor.affiliation | Lieberman, M, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Plasma Research Laboratory, The Australian National University | |
local.contributor.affiliation | Charles, Christine, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Plasma Research Laboratory, The Australian National University | |
local.contributor.affiliation | Boswell, Roderick, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Plasma Research Laboratory, The Australian National University | |
local.bibliographicCitation.issue | 12 | |
local.bibliographicCitation.startpage | 122101 | |
local.identifier.doi | 10.1063/1.2398929 | |
dc.date.updated | 2015-12-08T02:51:26Z | |
local.identifier.scopusID | 2-s2.0-33846080998 | |
Collections | ANU Research Publications |
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