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Laboratory evidence of a supersonic ion beam generated by a current-free "helicon" double-layer

Phys. Plasmas 11, 1706 (2004); doi:10.1063/1.1652058

Published 5 April 2004

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C. Charles and R. W. Boswell
Plasma Research Laboratory, Research School of Physical Sciences and Engineering, The Australian National University, Acton, ACT 0200, Australia
An electric double-layer is generated near the open end of a high-density low pressure helicon sustained radio frequency (13.56 MHz) plasma source which expands into a diffusion chamber. Ion energy distribution functions measured with a retarding field energy analyzer placed in the diffusion chamber with its aperture facing the double-layer show the presence of a low energy peak (~29 V) around the local plasma potential and a high energy peak (~47 V) corresponding to a supersonic ion beam (~2.1cs). At an axial distance 12 cm downstream of the double-layer, the beam density is 14% of the local density at that position and the ion energy gain is approximately 70% of the potential drop of the double-layer. The ion beam is observed from the center out to a radius corresponding to that of the plasma source tube (–6.8 cm<=r<=+6.8 cm) and is not greatly affected by the expanding magnetic field. A depression in the total ion flux just downstream of the double-layer—previously measured on the main z-axis of the reactor—is also present across the chamber diameter. Evidence of an electron beam near the closed end of the source tube, generated via "backwards" acceleration through the double-layer, has been observed on a Langmuir probe trace. ©2004 American Institute of Physics.
History: Received 25 September 2003; accepted 6 January 2004; published 5 April 2004
Permalink: http://link.aip.org/link/?PHPAEN/11/1706/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.40.Kh
    Plasma sheaths
  • 52.59.-f
    Intense particle beams and radiation sources in plasmas
  • 52.25.-b
    Plasma properties
  • 52.50.Dg
    Plasma sources
  • 52.70.Ds
    Electric and magnetic plasma diagnostic measurements
  • 29.27.Fh
    Beam characteristics in accelerators
  • YEAR: 2004

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ISSN:
1070-664X (print)   1089-7674 (online)
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