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: JP11.00145 : Design of a Four-Pin Triple Langmuir Probe for the Pi3 Spherical Tokamak at General Fusion Inc.
Presenter:
Benjamin Y Brown
(General Fusion)
Authors:
Benjamin Y Brown
(General Fusion)
Celso Ribeiro
(General Fusion)
Russ Ivanov
(General Fusion)
Meet Nandu
(General Fusion)
Mark Bunce
(General Fusion)
Kelly Epp
(General Fusion)
Adrian Wong
(General Fusion)
Kathryn Leci
(General Fusion)
Alexander D Mossman
(General Fusion)
Michel Laberge
(General Fusion)
General Fusion Team
(General Fusion)
The plasma facing components were selected to avoid failure during the ~30 ms plasma lifetime. Hexagonal boron nitride was chosen due to its machinability and high thermal conductivity favoring thermal shock resistance. Using preliminary Langmuir probe data, a 1-D thermal simulation confirmed the probe will remain below the material’s operating temperature.
The electronic readout and bias circuitry floats at Pi3’s vessel wall potential which can vary over 1kV during a shot. EMI is minimized by continuous electrostatic shielding and passive signal conditioning.
The probe will assist transport studies for Pi3 [1] with results expected next campaign.
[1] C. Ribeiro et al., in this conference.
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