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 YP11: Poster Session IX: In-Person, Hall A (9:30-11:00am) and Virtual Poster Presentations (11:15am-12:30pm)
Supplemental
9:30 AM - 12:30 PM
Friday, October 21, 2022
Room: Exhibit Hall A and Online
Abstract: YP11.00015 : Triple Langmuir Probes in Lithium-Driven Low Recycling Regimes in the Spherical Tokamak Pi3 at General Fusion Inc
Presenter:
Celso Ribeiro
(General Fusion Inc)
Authors:
Celso Ribeiro
(General Fusion Inc)
Russ Ivanov
(General Fusion Inc)
Benjamin Brown
(General Fusion Inc)
Meet Nandu
(General Fusion Inc)
Mark Bunce
(General Fusion Inc)
Kelly Epp
(General Fusion Inc)
Adrian Wong
(General Fusion Inc)
Kathryn Leci
(General Fusion Inc)
Alexander D Mossman
(General Fusion Inc)
Michel Laberge
(General Fusion Inc)
This probe body is made of alumina with 3 tungsten wires of 0.9mm diameter (3mm length) with an interspace of 4mm and a bias of 75-100V between pins. The sample rate was 1ms. The probe was moved about 4cm. (cp. with a=37cm) into the plasma scrap-off-layer (SOL). The SOL thickness is the result of a programable minor detachment of the plasma outboard last-close-surface (LCS) to respect the quasi-spherical inner radius R=1.00m thick (50mm Al) vacuum wall, acting as flux-conserver.
With CHI, a transitory high load power at the probe head was observed in the early times of the discharge. This prevents the probe from being inserted beyond 2cm inside of the LCS accordingly to the equilibrium reconstruction.
At 2.5cm inside of SOL, the probe measured a maximum value of Te=9eV at the formation which reduces to 2eV just after 10ms. The density remains almost constant over such a time interval, that is ne=0.4x1019m-3. This value of density is overestimated because of the effect of the sheath collection area.
In such a position, this probe also identifies the onset of the internal reconnection events (IREs) prior to the appearance of the same signature from the magnetic poloidal pick-up (Mirnov) coils.
A new probe with an h-BN head has been created with the same 4mm pin-interspace but with 4-pins and 0.6mm diameter. Now, the anomalous particle radial particle losses are expected also to be inferred. The results of both probes will be compared.
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700