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Title:
The dependence of the virtual cathode in a Polywell™ on the coil current and background gas pressure
Authors:
Carr, Matthew; Khachan, Joe
Affiliation:
AA(Nuclear Fusion Physics Group, School of Physics A28, University of Sydney, New South Wales 2006, Australia), AB(Nuclear Fusion Physics Group, School of Physics A28, University of Sydney, New South Wales 2006, Australia)
Publication:
Physics of Plasmas, Volume 17, Issue 5, article id. 052510 5 pp. (2010). (PhPl Homepage)
Publication Date:
05/2010
Origin:
AIP
Keywords:
Langmuir probes, magnetic traps, plasma devices, plasma inertial confinement, plasma magnetohydrodynamics, plasma pressure, plasma transport processes, pulsed power supplies
PACS Keywords:
Heavy-ion inertial confinement, Field-reversed configurations rotamaks astrons ion rings magnetized target fusion and cusps, Magnetohydrodynamics, Transport properties, Electric and magnetic measurements, Plasma devices
Abstract Copyright:
2010: American Institute of Physics
DOI:
10.1063/1.3428744
Bibliographic Code:
2010PhPl...17e2510C

Abstract

Floating potential measurements have been carried out on a Polywell™ inertial electrostatic confinement device that uses magnetic cusps to trap electrons and establish a virtual cathode. In particular, the dependence of the floating potential on the coil current and background gas pressure was studied. The magnetic field coils were driven by a pulsed current supply and it was found that the virtual cathode could only be established within a narrow range of currents. In addition, it was shown that the magnitude of the floating potential increased with decreasing background gas pressure. It is conjectured that the depth of the virtual cathode and its lifetime are dependent on the magnitude of the injected electron current.
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