RF antenna helicity dependent particle heating in a helicon source

Stevenson, Katey J.; Gilbert, T. J.; Good, T. N.; Paul, M.; Shi, P.; Nirwan, R.; Srivastav, P.; Steinberger, T. E.; Scime, Earl E.

doi:10.1088/1361-6595/ad3a9c

RF antenna helicity dependent particle heating in a helicon source

Journal Article · Fri Apr 12 00:00:00 EDT 2024 · Plasma Sources Science and Technology

DOI:https://doi.org/10.1088/1361-6595/ad3a9c· OSTI ID:2341808

^[1]; Gilbert, T. J. ^[1]; Good, T. N. ^[2]; Paul, M. ^[3]; ^[4]; Nirwan, R. ^[1]; Srivastav, P. ^[5]; Steinberger, T. E. ^[1]; ^[1]

West Virginia Univ., Morgantown, WV (United States)
Gettysburg College, PA (United States)
West Virginia Univ., Morgantown, WV (United States); Naval Research Lab. (NRL), Washington, DC (United States)
West Virginia Univ., Morgantown, WV (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
West Virginia Univ., Morgantown, WV (United States); Institute for Plasma Research, Gujarat (India)

Experiments have demonstrated that ion phenomena, such as the lower hybrid resonance, play an important role in helicon source operation. Damping of the slow branch of the bounded whistler wave at the edge of a helicon source (i.e. the Trivelpiece-Gould mode) has been correlated with the creation of energetic electrons, heating of ions at the plasma edge, and anisotropic ion heating. Here we present ion velocity distribution function measurements, electron density and temperature measurements, and magnetic fluctuation measurements on both sides of an m = |1| helical antenna in a helicon source as a function of the driving frequency, magnetic field strength, and magnetic field orientation relative to the antenna helicity. Significant electron and ion heating (up to two times larger) occurs on the side of the antenna consistent with the launch of the m = +1 mode. The electron and ion heating occurs within one electron skin depth of the plasma edge, where slow wave damping is expected. The source parameters for enhanced particle heating are also consistent with lower hybrid resonance effects, which can only occur for Trivelpiece-Gould wave excitation.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF)

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 2341808

Journal Information:: Plasma Sources Science and Technology, Journal Name: Plasma Sources Science and Technology Journal Issue: 4 Vol. 33; ISSN 0963-0252

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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