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 PI01: Magnetic Confinement Fusion V
2:00 PM–5:00 PM,
Wednesday, October 19, 2022
Room: Ballroom 100 A
Chair: Kathreen Thome, GA
Abstract: PI01.00004 : An overview of the first physics results from MAST Upgrade*
3:30 PM–4:00 PM
Presenter:
Jack Lovell
(Oak Ridge National Laboratory)
Author:
Jack Lovell
(Oak Ridge National Laboratory)
Collaboration:
The MAST Upgrade Team
MAST-U was designed to explore the Super-X divertor (SXD) concept, where the outer divertor leg is at large major radius with significant poloidal flux expansion near the target. Both conventional (CD) and Super-X divertor scenarios were established for plasma currents up to 750 kA; comparisons between the two showed the SXD configuration achieved a 10-fold reduction in target heat flux as measured by IR thermography in plasmas with 3.2 MW of neutral beam injection (NBI) auxiliary heating. Divertor detachment is reached at half the upstream density in SXD configuration compared with CD.
A combination of increased divertor closure and better plasma shaping improves control of the edge density which in turn results in pedestal temperatures reaching 400 eV. ELM mitigation was achieved with n=1 RMP coils. MAST-U pedestals are peeling mode limited which may aid access to ELM-free H mode scenarios.
Two NBIs inject at the midplane and 75 cm above the midplane, providing both on-axis and off-axis injection for improved current density control. High energy, type-1 ELMy H-mode plasmas were sustained at 750 kA for 1 second using both beams to inject an average of 3 MW of power. A super-Aflvénic fast particle population was found to excite a range of instabilities, including suspected toroidal Alfvén eigenmodes, fishbones and compressional or global Alfvén eigenmodes.
*This work is supported by US Department of Energy awards DE-AC05-00OR22725 and DE-SC0014264.This work has been part-funded by the RCUK Energy Programme (grant numbers EP/T012250/1 and EP/W006839/1).
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