Measurement and modeling of the radio frequency sheath impedance in a large magnetized plasma

Myra, J. R.; Lau, C.; Van Compernolle, B.; Vincena, S.; Wright, J. C.

doi:10.1063/5.0010688

Measurement and modeling of the radio frequency sheath impedance in a large magnetized plasma

Journal Article · Tue Jul 14 04:00:00 EDT 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0010688· OSTI ID:1638974

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Lodestar Research Corporation, Boulder, CO (United States); Lodestar Research Corporation
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of California, Los Angeles, CA (United States); General Atomics, San Diego, CA (United States)
Univ. of California, Los Angeles, CA (United States)
MIT Plasma Science and Fusion Center, Cambridge, MA (United States)

The DC and RF properties of radio frequency (RF) driven sheaths were studied in the Large Plasma Device (LAPD) at the University of California, Los Angeles. The experiments diagnosed RF sheaths on field lines connected to a grounded plate at one end and an ion cyclotron range of frequencies (ICRF) antenna at the other end. The experimental setup permitted measurement of the RF sheath impedance at the plate as a function of DC sheath voltage, with the latter controlled by varying the RF current applied to the antenna. Here, the DC current-voltage characteristics of these sheaths and the RF sheath impedance measurements were compared with modeling. Hot electrons, present in the LAPD plasma, were inferred to contribute significantly to both the DC and RF currents and hence the RF impedance. It was postulated that at very low power hot electrons could not access the region of the plasma subject to RF waves, resulting in an increased RF impedance. Within some experimental limitations and significant assumptions, an RF sheath impedance model was verified by the experimental data.

View Accepted Manuscript (DOE)

Research Organization:: Lodestar Research Corporation, Boulder, CO (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Contributing Organization:: Department of Physics and Astronomy, UCLA, Basic Plasma Science Facility

Grant/Contract Number:: FG02-97ER54392; AC05-00OR22725

OSTI ID:: 1638974

Alternate ID(s):: OSTI ID: 1638412
OSTI ID: 1648974

Report Number(s):: ORNL/4000158507--5; DOE-ER/54392--96; LRC-20-183

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 7 Vol. 27; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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