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Scheme of dc plasma torch and acoustic resonator.
(a) Temporal evolution of a typical arc voltage signal and (b) temporal evolution of a filtered arc voltage of Helmholtz mode for and 1.5 mm.
Power spectra of arc voltage for different z values. Spectra are normalized with respect to the variance of signals. The acoustic resonator is inactive for .
Dependence of stability ratio on resonator position z.
Dependence of normalized Helmholtz signal power and rms arc voltage of Helmholtz mode on resonator diameter.
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