期刊
NUCLEAR FUSION
卷 62, 期 12, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1741-4326/ac99ed
关键词
lower hybrid current drive; current drive efficiency; density limit; parametric decay instability; wave accessibility
资金
- National Natural Science Foundation of China [11775259, 11975266, 11805233, 11975276]
- Comprehensive Research Facility for Fusion Technology Program of China [2018-000052-73-01-001228]
- Anhui Provincial Natural Science Foundation [2008085J04]
- US Department of Energy [DE-SC0010492]
- U.S. Department of Energy (DOE) [DE-SC0010492] Funding Source: U.S. Department of Energy (DOE)
LHCD experiments were conducted in EAST L-mode plasmas with line-averaged density up to 5.1 x 10(19) m(-3). The results showed that the LHCD density limit can be increased with higher wave source frequency and higher magnetic field. The mechanisms responsible for the LHCD density limit differ between 2.45 GHz and 4.6 GHz waves.
Lower hybrid current drive (LHCD) experiments with line-averaged density up to similar to 5.1 x 10(19) m(-3) were performed in EAST L-mode plasmas. When the line-averaged density rises above a critical value, the hard x-ray (HXR) emission falls to the noise level, indicating that the LHCD density limit is encountered. The experimental results show that the LHCD density limit can be increased with higher wave source frequency (f (0)) and higher magnetic field (B (t)). Although a higher LHCD density limit is obtained by a higher magnetic field for both 2.45 GHz and 4.6 GHz waves, the results show a stronger dependence on the magnetic field for the 4.6 GHz case. Analysis suggests that, for normal operation with a relatively low magnetic field (1.6 T <= B (t) <= 2.5 T) on EAST, the dominant mechanisms responsible for the LHCD density limit are different between the 2.45 GHz and 4.6 GHz waves. The wave accessibility plays a more significant role during 4.6 GHz LHCD experiments, while parasitic losses due to parametric decay instability (PDIs) dominate the accessibility issue in the 2.45 GHz case. Collisional loss in the scrape-off layer (SOL) may explain the 4.6 GHz result when combined with the accessibility limit at high density and low temperature.
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