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Title: The dependence of potential well formation on the magnetic field strength and electron injection current in a polywell device

A capacitive probe has been used to measure the plasma potential in a polywell device in order to observe the dependence of potential well formation on magnetic field strength, electron injection current, and polywell voltage bias. The effectiveness of the capacitive probe in a high energy electron plasma was determined by measuring the plasma potential of a planar diode with an axial magnetic field. The capacitive probe was translated along the axis of one of the field coils of the polywell, and the spatial profile of the potential well was measured. The confinement time of electrons in the polywell was estimated with a simple analytical model which used the experimentally observed potential well depths, as well as a simulation of the electron trajectories using particle orbit theory.
Authors:
; ; ;  [1]
  1. School of Physics, The University of Sydney, Sydney, NSW 2006 (Australia)
Publication Date:
OSTI Identifier:
22303633
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CONFINEMENT TIME; CURRENTS; ELECTRON BEAM INJECTION; ELECTRONS; EQUIPMENT; MAGNETIC FIELDS; ORBITS; PLASMA; PLASMA POTENTIAL; PLASMA SIMULATION; POTENTIALS; PROBES