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Review of Scientific Instruments / Volume 76 / Issue 1 / PARTICLE SOURCES, OPTICS AND ACCELERATION; PARTICLE DETECTORS

Rev. Sci. Instrum. 76, 013303 (2005); doi:10.1063/1.1829996 (6 pages)

Creation of plasma density transitions short compared to the plasma skin depth

M. C. Thompson, J. B. Rosenzweig, and G. Travish

University of California, Los Angeles, Physics and Astronomy, Knudson Hall 1-129, Los Angeles, California 90095

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(Received 13 August 2004; accepted 12 October 2004; published online 20 December 2004)

A plasma based electron beam source apparatus is described which creates a plasma with two distinct density regions separated by a transition which is shorter than the plasma skin depth kp−1 of either region. This sharp density modulation is achieved by using a perforated stainless steel screen to filter half of a diffusing plasma column. A simple physical model predicts that the length of the plasma density transition will vary with the distance from the screen. For a weakly magnetized plasma, the transition length will be twice the distance, on a line normal to the screen plane, from the screen edge to the location where the transition is measured. The plasma column is generated using an argon discharge plasma source. It has a peak density of approximately 3.5×1013 cm−3 and a full width half maximum width of 5 cm. The discharge source utilizes a 7.5 cm diameter LaB6 disk cathode heated to 1300 °C using a graphite heater. The plasma column is filtered with a 78 μm thick stainless steel sheet with 152 μm holes and 21% open area. Plasma density transitions with lengths between 0.74 and 0.95kp−1 were measured.

© 2005 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. GENERATING DENSITY TRANSITIONS
  3. THE ARGON PULSE DISCHARGE PLASMA SOURCE
  4. CREATION OF THE PLASMA DENSITY TRANSITION
  5. DISCUSSION

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KEYWORDS and PACS

Keywords

plasma sources, plasma devices, plasma density, beam handling equipment, skin effect, electron beam effects, plasma confinement, plasma magnetohydrodynamics

PACS

  • 52.75.-d

    Plasma devices

  • 07.77.Ka

    Charged-particle beam sources and detectors

  • 52.50.Dg

    Plasma sources

  • 52.55.-s

    Magnetic confinement and equilibrium

  • 52.25.Xz

    Magnetized plasmas

  • 52.30.Cv

    Magnetohydrodynamics (including electron magnetohydrodynamics)

ARTICLE DATA

Permalink
http://link.aip.org/link/doi/10.1063/1.1829996

PUBLICATION DATA

ISSN:

0034-6748 (print)  
1089-7623 (online)

Publisher:

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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