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Time development of a current-free double-layer

Phys. Plasmas 11, 3808 (2004); doi:10.1063/1.1764829

Published 25 June 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
The time development of a supersonic (~2.3cs) argon ion beam generated by a current-free double-layer (DL) is obtained by pulsing a "helicon" discharge (13.56 MHz) and measuring the total ion current and the ion beam current during the first few milliseconds using a retarding field energy analyzer. The ion beam current is detected during the plasma breakdown phase (60–250 µs) and is stable thereafter (>=250 µs). Temporal measurements of the floating potential upstream and downstream of the DL show evidence of wall charging in the plasma source during the first 250 µs of the discharge which appear to be related to the appearance of the double-layer. A comparison between the DL case and a somewhat higher pressure "non DL" case suggests that the double-layer is formed at ~100 µs. ©2004 American Institute of Physics.
History: Received 10 March 2004; accepted 28 April 2004; published 25 June 2004
Permalink: http://link.aip.org/link/?PHPAEN/11/3808/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.40.Kh
    Plasma sheaths
  • 52.80.Pi
    High-frequency and RF discharges
  • 52.59.-f
    Intense particle beams and radiation sources in plasmas
  • 52.25.Fi
    Plasma transport properties
  • 52.40.Hf
    Plasma–material interactions; boundary layer effects
  • 52.70.Ds
    Electric and magnetic plasma diagnostic measurements
  • YEAR: 2004

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PUBLICATION DATA

ISSN:
1070-664X (print)   1089-7674 (online)
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REFERENCES (20)
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