Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session PI01: Magnetic Confinement Fusion V
2:00 PM–5:00 PM,
Wednesday, October 19, 2022
Room: Ballroom 100 A
Chair: Kathreen Thome, GA
Abstract: PI01.00006 : RF Sheath Mitigation with Insulating Antenna Enclosures on the LAPD*
4:30 PM–5:00 PM
Presenter:
Gurleen Bal
(University of California, Los Angeles)
Authors:
Gurleen Bal
(University of California, Los Angeles)
Bart v Compernolle
(General Atomics)
Patrick Pribyl
(University of California, Los Angeles)
Joshua J Larson
(University of California, Los Angeles)
Troy Carter
(University of California, Los Angeles)
Sheath control by insulating limiters has been explored by Majeski [2] et al and Myra [3] et al. The model presented by Myra et al treats the insulating wall and the plasma sheath as two electrical components in series with each other. Depending on the RF voltage, plasma parameters, and insulator parameters one can determine the potential drop across the plasma sheath vs. the insulator. In experiments done on the LAPD, as predicted by the model, the MACOR insulating layers are effective at mitigating large RF sheath potentials at higher plasma density while they are not as effective at lower plasma density.
[1]M. J. Martin et al., Physical Review Letters 119, (2017).
[2]R. Majeski et al., Fusion Engineering and Design 24, 159 (1994).
[3]J. R. Myra et al., Journal of Nuclear Materials 249, 190 (1997).
*This work was performed using the Basic Plasma Science Facility which is supported by DOE and NSF.
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