1. Achievement of Reactor-Relevant Performance in Negative Triangularity Shape in the DIII-D Tokamak
- Author
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M.L. Walker, Choongki Sung, Max E Austin, J.S. deGrassie, C.C. Petty, A.W. Hyatt, Kathreen Thome, George McKee, Sterling Smith, T. L. Rhodes, Michael Brookman, A. D. Turnbull, and Alessandro Marinoni
- Subjects
Physics ,Tokamak ,DIII-D ,General Physics and Astronomy ,Plasma ,Electron ,Radius ,01 natural sciences ,Neutral beam injection ,law.invention ,High-confinement mode ,law ,Beta (plasma physics) ,0103 physical sciences ,Atomic physics ,010306 general physics - Abstract
Plasma discharges with a negative triangularity (δ=-0.4) shape have been created in the DIII-D tokamak with a significant normalized beta (β_{N}=2.7) and confinement characteristic of the high confinement mode (H_{98y2}=1.2) despite the absence of an edge pressure pedestal and no edge localized modes (ELMs). These inner-wall-limited plasmas have a similar global performance as a positive triangularity (δ=+0.4) ELMing H-mode discharge with the same plasma current, elongation and cross sectional area. For cases both of dominant electron cyclotron heating with T_{e}/T_{i}>1 and dominant neutral beam injection heating with T_{e}/T_{i}=1, turbulent fluctuations over radii 0.5
- Published
- 2019