Characterization of hollow cathode plasma turbulence using coherent Thomson scattering

Tsikata, S.; Hara, K.; Mazouffre, S.

doi:10.1063/5.0071650

Title: Characterization of hollow cathode plasma turbulence using coherent Thomson scattering

Journal Article · Tue Dec 28 00:00:00 EST 2021 · Journal of Applied Physics

DOI:https://doi.org/10.1063/5.0071650· OSTI ID:1978981

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Centre National de la Recherche Scientifique (CNRS), Orleans (France)
Stanford University, CA (United States)

Turbulence in hollow cathodes used for space propulsion is believed to play an important role in anomalous electron transport and ion heating. In this work, the implementation of coherent Thomson scattering to identify and characterize MHz-frequency ion acoustic turbulence and kHz-frequency oscillations in the plume of a hollow cathode is achieved. In the presence of a background magnetic field of a Hall thruster, a number of unstable modes are observed. A directive ion acoustic mode propagating predominantly within a restricted angle around the magnetic field is found, exhibiting an energy scaling with wavenumber k of the form k^-5.2±0.58, which differs from the classic Kadomtsev k^-3 scaling for unmagnetized conditions. Bi-directional ion acoustic mode fluctuations propagating over a range of angles with respect to the magnetic field have been measured, possibly signifying the existence of a large-amplitude plasma wave, similar to the Buneman instability. Finally, electron density fluctuations in the kHz-frequency range, a possible consequence of drift-driven instabilities in the plane perpendicular to the magnetic field, have also been identified. Furthermore, these results not only are an indication of the diversity of wave types that exist in hollow cathode plumes but also point to the key role played by the presence of, and the configuration of, the magnetic field in their appearance.

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Research Organization:: Stanford Univ., CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); US Air Force Office of Scientific Research (AFOSR)

Grant/Contract Number:: SC0020623; FA9550-18-1-0090; FA9550-21-1-0433

OSTI ID:: 1978981

Alternate ID(s):: OSTI ID: 1837609

Journal Information:: Journal of Applied Physics, Vol. 130, Issue 24; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Characterization of hollow cathode plasma turbulence using coherent Thomson scattering

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