Triple Probe Measurements Benchmarked by Interferometry in a Pulsed‐Power Plasma

Abstract

An electrostatic triple probe was employed to investigate electron densities in a pulsed-power discharge plasma. The inherent property of electrostatic probes to disturb the plasma is one of the major problems of these diagnostics. The quantification of the systematic error is not straightforward. In order to get non-intrusive and reliable measurements, a CO2 laser interferometer was set up to determine line integrated-electron densities. The data are converted into electron number densities by assuming a parabolic density distribution across the plasma column. In a comparison, the triple probe underestimates the electron density.

On the relevance of magnetohydrodynamic pumping in solar coronal loop simulation experiments

“…In order to determine the electron density in the apex of the flux loop with higher precision, the movable triple probe was replaced by a CO 2 laser interferometer whose probing beam could be shifted inside the vessel by means of a vacuumcompatible translation stage 16,17 . Results are shown in Fig.…”

Electron density in amplitude modulated microwave atmospheric plasma jet as determined from microwave interferometry and emission spectroscopy

“…to objects with dimensions comparable to the wavelength. Recent research employs all sorts of advanced approaches, including heterodyne detection [33][34][35][36], dual lasers [37], holographic interferometer [38], transmission line design [39], one-port microwave interferometer [36,40], combined techniques [41], radio frequencies [42], harmonics [43], dielectric waveguides [44][45][46], and micro-strip line [47].…”