Double layer formation in the expanding region of an inductively coupled electronegative plasma
Résumé
Double-layers (DLs) were observed in the expanding region of an
inductively coupled plasma with $\text{Ar}/\text{SF}_6$ gas mixtures. No DL was observed in
pure argon or $\text{SF}_6$ fractions below few percent. They
exist over a wide range of power and pressure although they are only
stable for a small window of electronegativity (typically between
8\% and 13\% of $\text{SF}_6$ at 1mTorr), becoming unstable at
higher electronegativity. They seem to be formed at the boundary
between the source tube and the diffusion chamber and act as an
internal boundary (the amplitude being roughly 1.5$\frac{kT_e}{e}$)between a high electron density, high electron
temperature, low electronegativity plasma upstream (in the
source), and a low electron density, low electron temperature,
high electronegativity plasma downstream.
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