Bulletin of the American Physical Society
60th Annual Meeting of the APS Division of Plasma Physics
Volume 63, Number 11
Monday–Friday, November 5–9, 2018; Portland, Oregon
Session NP11: Poster Session V: Laser-plasma Particle Acceleration; HEDP; Turbulence and Transport; DIII-D Tokamak; Machine Learning, Data Science (9:30am-12:30pm)
Wednesday, November 7, 2018
OCC Room: Exhibit Hall A1&A
Abstract ID: BAPS.2018.DPP.NP11.88
Abstract: NP11.00088 : Development and extension of the non-inductive high beta poloidal regime to ITER relevant dimensionless parameters on DIII-D *
David B Weisberg
David B Weisberg
Andrea M Garofalo
The high βp scenario on DIII-D has been extended to higher plasma current and higher βN in the pursuit of ITER relevant dimensionless parameters. This pursuit is motivated by the fusion gain metric G=βNH89p/q952, which is required to be ~0.27 in the ITER Q=5 steady state mission. High βp experiments on DIII-D maximize this metric in steady-state relevant scenarios through the formation of an internal transport barrier (ITB) and the resulting high confinement and bootstrap fraction. Progress in this ITER-relevant metric will be presented, including details of scenario development and increased understanding of the underlying physics. Inductively-driven DIII-D plasmas with ITBs have achieved high confinement and fusion gain (H89p=2.8, G=0.21) at either higher current or higher βN, but increasing both parameters simultaneously has proven difficult. Obstacles such as the fast external kink mode and wall-interactions of counter-streaming ions will be discussed, as will the varying efficacy of RMP-ELM suppression and resistive wall mode feedback. A correlation between core impurities and ITB collapses will also be presented, suggesting that cyclic drops in confinement occur in the absence of adequate particle control.
*Supported by US DOE under DE-FC02-04ER54698.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DPP.NP11.88
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