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Title:
A biased probe analysis of potential well formation in an electron only, low beta Polywell magnetic field
Authors:
Carr, Matthew; Khachan, Joe
Affiliation:
AA(Department of Plasma Physics, School of Physics A28, University of Sydney NSW 2006, Australia), AB(Department of Plasma Physics, School of Physics A28, University of Sydney NSW 2006, Australia)
Publication:
Physics of Plasmas, Volume 20, Issue 5, article id. 052504 10 pp. (2013). (PhPl Homepage)
Publication Date:
05/2013
Origin:
AIP
Keywords:
electron beams, plasma confinement, plasma probes, plasma transport processes
PACS Keywords:
Electric and magnetic measurements, Field-reversed configurations rotamaks astrons ion rings magnetized target fusion and cusps, Transport properties
Abstract Copyright:
2013: AIP Publishing LLC
DOI:
10.1063/1.4804279
Bibliographic Code:
2013PhPl...20e2504C

Abstract

Orbital limited motion theory has been applied to two biased probes in a low beta Polywell. The cases studied include electron injection, magnetic field scaling, Polywell bias scaling, and radial position profiles. Langmuir's original orbital limited motion results for a monoenergetic electron beam are shown to be in excellent agreement for electron injection into the Polywell. A distribution function is proposed for the electron plasma characteristics in the centre of the magnetic null and confirmed with experimental results. A translational stage was used to measure the radial plasma potential profile. In other experiments, two probes were used to simultaneously measure the profiles in both the null and a position halfway along a corner cusp. The results confirm a radial potential well created by electron trapping in the device. In addition, we present preliminary results of the potential well scaling with the magnetic field, Polywell bias voltage, and the injected beam current. The electron population was found to maintain non-equilibrium in all cases studied.
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