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 YO08: Measurement and Diagnostic Techniques for Low Temperature Plasmas
9:30 AM–12:30 PM,
Friday, October 21, 2022
Room: 402 ABC
Chair: Sophia Gershman, PPPL
Abstract: YO08.00006 : Characterizing the Life-Cycle of Threshold Electrostatic Discharges Using Coupled Electrical and Optical Measurement*
10:30 AM–10:42 AM
Presenter:
Claudia A Schrama
(Colorado School of Mines)
Authors:
Claudia A Schrama
(Colorado School of Mines)
Sarah Hinnegan
(Colorado School of Mines)
Jonathan Barolak
(Colorado School of Mines)
Daniel Adams
(Colorado School of Mines)
Alex Wilhelm
(Colorado School of Mines)
Charles G Durfee
(Colorado School of Mines)
We use our home-built ESD chamber to obtain time-dependent electron and neutral density profiles. We analyze two-color Mach-Zehnder interferograms with wavelet transforms and Abel inversion. The fast-framing cameras are currently triggered on the leading edge of a current viewing resistor signal; a UV triggering pulse will allow us to measure the earlier ESD phases.
Coupling our electrical and optical measurements allows us to determine how much of the resistance changes are attributed to the evolution of the channel density profiles. The fall and rise in ESD channel resistance following the initial breakdown occurs in distinct phases. In the 1-10us timeframe, we see a rise in resistance without a density change in the electrons, pointing to plasma cooling as the cause. The combination of these data sets informs our models of the spark evolution and low-temperature recombination.
*This work was supported by Los Alamos National Laboratory.
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