From: dave <djw1NOdjSPAM@djw1.freeserve.co.uk.invalid>
Subject: Re: Capacitative coupling in a magnetic field
Newsgroups: sci.physics.plasma
Organization: http://www.remarq.com: The World's Usenet/Discussions Start Here
References: <87efll$5bo$1@jupiter.cs.uml.edu> <87pvdf$1nf$1@jupiter.cs.uml.edu>


Thanks for your interest,

Some more details:

A 13.56MHz rf supply is drivind an electrode - this is a
(1 mm) copper strip of approx 3 cm axial width and
arbitrary length.

This is aligned so that the 3 cm width is parallel to the
axial magnetic field (0.5 T).

When running at a few hundrew watts in a 0.01 Pa argon
atmosphere, a diffuse plasma is formed which 'streams'
axially to the earthed ends of the vessel - there is no
localised source region, instead the ionisation is probably
more or less uniform along the axial length. This has a
'thickness' of around 1 cm - this decreased with increased
pressure, or increased magnetic field.

However, turning the electrode through 90 degrees so that
there is only a 1 mm length perpendicular to the field
causes the plasma to more or less disappear.

Any thoughts about the mechanism of excitation ?








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