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 JP11: Poster Session IV: In-Person, Hall A (2:00-3:30pm) and Virtual Poster Presentations (3:45-5:00pm)
BEAMS: Laser Accelerators
Education, Public Engagement, and DEI
High School and Undergraduate Research
2:00 PM - 5:00 PM
Tuesday, October 18, 2022
Room: Exhibit Hall A and Online
Abstract: JP11.00046 : ELM Filtering Algorithm Using Only Langmuir Probe Signals*
Presenter:
Joseph S Buck
(Brigham Young University)
Authors:
Joseph S Buck
(Brigham Young University)
Dinh D Truong
(Sandia National Laboratories)
David Eldon
(General Atomics - San Diego)
been developed in Python that automates the process without relying on external signals. The
filter employs adaptive peak height and width detection to ensure that varying types of ELMs
within a plasma shot can be captured. This technique improves the probes’ steady-state inter-
ELM data accuracy and can be used when other fast ELM detection signals (e.g., D-alpha filterscopes)
are unavailable. The high confinement mode (H-mode) in tokamaks is prone to ELMs,
uncontrolled periodic bursts of energy and particles. These energy and particle fluxes contribute
to undesirable plasma-material interactions. While existing tokamaks can largely withstand
ELMs, future devices will experience more intense ELMs which could cause significant damage
in much shorter time than the desired operating lifetime. DIII-D employs LPs in the divertors to
monitor edge-plasma conditions; ELMs appear as spikes in the LP signals, which are then
propagated to the derived quantities (n e , T e , V f , J sat ). These spikes can be orders of magnitude
greater than the inter-ELM values, skewing the probes’ time-averaged data. Results of ELM-
filtered LP data from the algorithm are compared to existing ELM filtering methods.
**Work supported by the US DOE under the Science Undergraduate Laboratory Internshipprogram and Award Numbers DE-FC02-04ER54698, DE-NA0003525.
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