Journal
NUCLEAR FUSION
Volume 61, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1741-4326/abe08e
Keywords
EAST; NBI; ELM; toroidal rotation; E × B flow shear; BOUT plus plus
Categories
Funding
- Shenzhen Clean Energy Research Institute
- National Key R&D Program of China [2017YFE0301205, 2017YFE0301705, 2017YFE0300501]
- Institute of Energy, Hefei Comprehensive National Science Center [19KZS205]
- International Partnership Program of Chinese Academy of Sciences [Y16YZ17271]
- Users with Excellence Program of Hefei Science Center CAS [2020HSC-UE008]
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Through experiments, it was found that counter-current toroidal rotation can reduce the size of edge localized modes (ELMs), while the net flow induced by both co- and counter-current neutral beam injection has a stabilizing effect on peeling-ballooning modes.
By scanning toroidal rotation with a combination of co- and counter-current direction neutral beam injection (NBI) on the Experimental Advanced Superconducting Tokamak, it is found the size of edge localized mode (ELM) decreases with increasing toroidal rotation in counter-current direction. The synergistic effect of plasma rotation and collisionality on ELM behavior is also studied by statistical analysis. Three-field module in BOUT++ framework is employed to study the impacts of toroidal rotation/E x B flow shear on ELM behaviors. The BOUT++ simulation results show that both Co- and Ctr-NBI induced net flow have stabilization effects on the peeling-ballooning modes, especially for counter NBI case, high-n ballooning mode can be totally stabilized. With larger E x B shear, the mode number of most unstable mode downshifts in the counter NBI case, with larger E x B shear, the mode number of most downshifts in the counter NBI case, correlated with reduced ELM size.
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