Anomalous Fast-Ion Transport During Neutral Beam Injection on EAST

The fast-ion transport during neutral beam injection on the Experimental Advanced Superconducting Tokamak (EAST) is studied. Based on the NUBEAM and TRANSP codes, it is found that fast-ion transport is anomalous when the minimum safety factor ( q min ) is about 2, while it is neoclassical when q min...

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Bibliographic Details
Published in:Plasma physics reports 2018-10, Vol.44 (10), p.891-898
Main Authors: Zhao, Y. A., Zhang, X. M., Yu, L. M., Xue, E. B., Chen, W. D.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Atomic
BEAM INJECTION
BEAM INJECTION HEATING
Colon
Discharge
EFFICIENCY
Heating
HT-7U TOKAMAK
Internal energy
Ion transport
Ions
Molecular
NEOCLASSICAL TRANSPORT THEORY
Neutral beams
Optical and Plasma Physics
Physics
Physics and Astronomy
PLASMA
Safety factors
STORED ENERGY
Tokamak devices
Tokamaks
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Summary:The fast-ion transport during neutral beam injection on the Experimental Advanced Superconducting Tokamak (EAST) is studied. Based on the NUBEAM and TRANSP codes, it is found that fast-ion transport is anomalous when the minimum safety factor ( q min ) is about 2, while it is neoclassical when q min is around 1. Neutral beam injection heating efficiency, plasma stored energy, and the total heating power are reduced when the fast ion transport is anomalous. The Alfvén continuum spectrum and the mode structures of toroidal Alfvén eigenmodes (AEs) are also calculated for comparison between neoclassical fast-ion transport and anomalous fast-ion transport. High- q min discharge with anomalous fast-ion transport has more AE activity than that of lower q min discharge with neoclassical fast-ion transport.
ISSN:1063-780X
1562-6938
DOI:10.1134/S1063780X18100124