Microhollow cathode sustained discharges: comparative studies in micro- and equivalent macro-cell geometries |
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Authors: | Th Callegari X Aubert A Rousseau J P Boeuf and L C Pitchford |
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Institution: | 1.Universite de Toulouse, UPS, LAPLACE (Laboratoire Plasma et
Conversion d’énergie),Toulouse Cedex 9,France;2.LPP, école Polytechnique, UPMC, Université Paris-Sud 11, CNRS,Palaiseau,France;3.CNRS,Toulouse,France |
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Abstract: | We present an experimental study of discharge initiation in a
three-electrode configuration consisting of a microhollow cathode discharge
(MHCD) and a third planar electrode, biased positively and placed some
distance away. This work is based on the microcathode sustained (MCS)
configuration where the MHCD acts as a plasma cathode and enables the
generation of a stable, non-equilibrium plasma at high pressure in the
volume between the MHCD and the third electrode. Our experiments were
carried out in two different set-ups, one using a MHCD as a cathode and
another in an “equivalent” macrocell geometry, easier to implement and
operating at lower pressure in which the same phenomena are observed.
Consistent with previous modeling results, we find that the plasma column in
the volume between the MHCD and the third electrode is characterized by a
low reduced electric field, with values similar to those expected for a
positive column. The ignition voltage of the plasma column depends on the
voltage difference between the MHCD and the third electrode, the MHCD
current, and the gas pressure and gap spacing. |
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Keywords: | |
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