Details

Autor(en) / Beteiligte

• Austin, M E
• Marinoni, A
• Walker, M L
• Brookman, M W
• deGrassie, J S
• Hyatt, A W
• McKee, G R
• Petty, C C
• Rhodes, T L
• Smith, S P
• Sung, C
• Thome, K E
• Turnbull, A D

Titel

Achievement of Reactor-Relevant Performance in Negative Triangularity Shape in the DIII-D Tokamak

Ist Teil von

• Physical review letters, 2019-03, Vol.122 (11), p.115001-115001, Article 115001

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2019

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• 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<ρ<0.9 were reduced by 10-50% in the negative triangularity shape compared to the matching positive triangularity shape, depending on the radius and conditions.