Achievement of Reactor-Relevant Performance in Negative Triangularity Shape in the DIII-D Tokamak
- OSTI
Plasma discharges with a negative triangularity (δ=−0.4) shape have been created in the DIII-D tokamak with a significant normalized beta (βN=2.7) and confinement characteristic of the high confinement mode (H98y2=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 Te/Ti>1 and dominant neutral beam injection heating with Te/Ti=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.
- Research Organization:
- General Atomics, San Diego, CA (United States); Univ. of Texas, Austin, TX (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; Univ. of California, Los Angeles, CA (United States); Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE National Nuclear Security Administration (NNSA)
- DOE Contract Number:
- FC02-04ER54698; FG02-97ER54415; FG02-94ER54235; FG02-08ER54984; FG02-08ER54999; AC52-07NA27344
- OSTI ID:
- 1882406
- Country of Publication:
- United States
- Language:
- English
Achievement of Reactor-Relevant Performance in Negative Triangularity Shape in the DIII-D Tokamak
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journal | March 2019 |
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