By Topic

Double layers in low pressure expanding magnetised plasmas

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
C. Charles ; Space Plasma, Power and Propulsion laboratory, Research School of Physical Sciences and Engineering, The Australian National University, Bldg 60, Mills Road, ACT 0200, AUSTRALIA ; R. W. Boswell

Summary form only given as follows. Electric double layers, cliffs of potential within a plasma, exist in the plasma environment of the Earth and the stars and can cause phenomena as diverse as aurorae, or electromagnetic radiation from rotating neutron stars called pulsars. They may also play an important role in supplying and accelerating plasma in coronal funnels at the surface of the Sun. In the laboratory, double layers spontaneously form in low pressure laboratory expanding plasmas of various geometry and density. In Chi Kung, our helicon plasma system, there is a magnetic-field-induced transition from a simple plasma expansion to a current-free double layer containing expanding plasma. The double layer "separates" a high potential region in the helicon source, from a low potential region in the expansion region and is the source of particle acceleration: a large area supersonic ion beam is measured in the low potential region for a variety of gases. In the high potential region, low energy electrons trapped in the double layer potential well are Maxwellian with a temperature of 8 eV and the high energy free electrons which flow downstream have a temperature of 5 eV. Although a single upstream plasma source is required to maintain the double layer, the double layer estinguishes when the plasma expansion is forcibly restrained. The current-free double layer in CHI KUNG is being developed as a new electrode- less space plasma engine with infinite lifetime, the Helicon Double Layer Thruster (HDLT), with potential applications to satellite altitude control or deep space missions.

Published in:

Plasma Science, 2008. ICOPS 2008. IEEE 35th International Conference on

Date of Conference:

15-19 June 2008