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 PP11: Poster Session VI: In-Person, Hall A (2:00-3:30pm) and Virtual Poster Presentations (3:45-5:00pm)
MFE: Diagnostics; Edge and Pedestal; Stability; Heating; Transport, Turbulence
ASTRO: Astrophysical Plasma
2:00 PM - 5:00 PM
Wednesday, October 19, 2022
Room: Exhibit Hall A and Online
Abstract: PP11.00090 : Progress on Transport Studies in the Spherical Tokamak (ST) Pi3 at General Fusion Inc
Presenter:
Celso Ribeiro
(General Fusion Inc)
Authors:
Celso Ribeiro
(General Fusion Inc)
Russ Ivanov
(General Fusion Inc)
Carl Dunela
(General Fusion Inc)
Filiberto Braglia
(General Fusion Inc)
Ivan Khalzov
(General Fusion Inc)
William Young
(General Fusion Inc)
Patrick Carle
(General Fusion Inc)
Akbar Rohollahi
(General Fusion Inc)
Xiande Feng
(General Fusion Inc)
Kelly Epp
(General Fusion Inc)
Adrian Wong
(General Fusion Inc)
Kathryn Leci
(General Fusion Inc)
Aaron Froese
(General Fusion Inc)
Ryan Zindler
(General Fusion Inc)
Daymon Krotez
(General Fusion Inc)
Calum Macdonald
(General Fusion Inc)
Matt Herunter
(General Fusion Inc)
Leopoldo Carbajal
(General Fusion Inc)
Alexander D Mossman
(General Fusion Inc)
Michel Laberge
(General Fusion Inc)
Neeraj Kumar
(General Fusion Inc)
Joshua Hawke
(General Fusion Inc)
The Pi3 plasmas are formed exclusively via coaxial-helicity injection (CHI) and last ~25ms. This plasma can be close-fitted or slightly detached to an Al spherical vacuum vessel of 1.00m inner radius and 50mm thickness, acting as a flux-conserver. The wall is regularly coated with lithium using 4 heated evaporators.
Typical values of Pi3 plasmas in early phases of discharge (~3ms) are: Ro=0.67m, a=0.37m, A=1.8, k=1.7, δ~0.4, BT(Ro)=0.23T, Ip =300kA, ne(bar)=4.3x1019m-3, Te(0)=170eV and Ti(bar)=230eV.
Equilibrium reconstruction is performed by Flagship code using constraints from poloidal pickup coils inside of the vessel wall and polarimeter signals[2].
Results of the thermal energy confinement time tauE and the thermal diffusivity Chi will be presented. The former is calculated from kinetics and magnetic power balance methods. Results from kinetics in medium plasma densities (NG=0.6) show tauE=8ms, close to the expected from the ITER97-L-mode scaling: 9ms. Analysis of new regimes at higher BT(Ro), Ip, and Te(0) will also be presented.
[1] A. Mossman et al., in this conference
[2] A. Froese et al, in this conference
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