Bulletin of the American Physical Society
66th Annual Meeting of the APS Division of Plasma Physics
Monday–Friday, October 7–11, 2024; Atlanta, Georgia
Session GP12: Poster Session III:
Low Temperature Plasmas
Fundamental Plasma Physics I: computation, boundaries
Fundamental Plasma Physics II: dusty, diagnostics
MFE Measurement and Diagnostics Techniques, Technology, and Edge and Pedestal Physics
9:30 AM - 12:30 PM
Tuesday, October 8, 2024
Hyatt Regency
Room: Grand Hall West
Abstract: GP12.00085 : Exploring hairpin resonator configurations for high electron density measurements in inductively coupled and magnetized plasmas*
Presenter:
Mychal J Valle
(University of California, Los Angeles)
Authors:
Mychal J Valle
(University of California, Los Angeles)
Yhoshua Wug
(University of California, Los Angeles)
Patrick Pribyl
(University of California, Los Angeles)
Derek Schaeffer
(University of California, Los Angeles)
Collaboration:
LAPD
When immersed in a plasma, a hairpin probe can measure electron densities from the shift of the resonant frequency of the hairpin structure relative to the electron plasma frequency. Previous efforts have developed hairpin probe hardware and theory that enable measurements of electron densities up to approximately 1012 cm-3, with the use of both quarter-wavelength and three-quarter-wavelength hairpin probes in a transmission mode together with the associated microwave electronics [1]. More recent theories for interpreting hairpin measurements use a transmission line model to accurately relate the resonant frequency of the probe and the electron density, including the resistive effects of a hairpin partially immersed with epoxy. These models have been used to accurately extract density measurements in inductively coupled plasmas; however, the models do not reliably account for measurements in magnetized plasmas. We present a novel hairpin design and model that minimizes the dielectric effects of the epoxy and potentially provides measurements of electron plasma densities up to 1013 cm-3, while also allowing the probes to be reliably used in magnetized plasmas, like those created in the Large Plasma Device (LAPD)[2] at UCLA.
*This work is supported by the NSF under Grant No. PHYS-2320946
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