Transient non-classical transport in the hollow cathode plume I: measurements of time-varying electron collision frequency

被引：19

作者：

Georgin, Marcel P. ^{[1
]}

Jorns, Benjamin A. ^{[2
]}

Gallimore, Alec D. ^{[2
]}

机构：

[1] Univ Michigan, Appl Phys Program, Ann Arbor, MI 48109 USA

[2] Univ Michigan, Dept Aerosp Engn, Ann Arbor, MI 48109 USA

来源：

PLASMA SOURCES SCIENCE & TECHNOLOGY | 2020年 / 29卷 / 10期

基金：

美国国家航空航天局;

关键词：

low-temperature plasma; plasma waves; plasma turbulence; hollow cathode; plasma propulsion; electric propulsion; ion acoustic turbulence; SCATTERING;

D O I：

10.1088/1361-6595/abb0ce

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Electrostatic probes are employed to measure the time-variations in electron collision frequency due to a large-scale, low-frequency, plasma instability in a high-current hollow cathode plasma discharge (plume mode oscillation). Time-resolved measurements of ion acoustic turbulence are used to infer the effective collision frequency on the timescale of this underlying wave. Through a direct comparison, it is shown that the observed variation in the electron collision frequency cannot be described by classical collisional processes, i.e. Coulomb and neutral collisions, but rather is well represented by the changes in the anomalous collision frequency due to the turbulence.

引用

页数：13

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