Effect of lower hybrid current drive on pedestal instabilities in the HL-2A tokamak
Edge localized mode (ELM) mitigation with lower hybrid current drive (LHCD) has been observed in the HL-2A tokamak. This mitigation effect is very sensitive to the parameters as the plasma density and the LHCD absorbed power, i.e., more easily to be observed for high density and large LHCD absorbed...
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Veröffentlicht in: | Physics of plasmas 2017-12, Vol.24 (12) |
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Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Edge localized mode (ELM) mitigation with lower hybrid current drive (LHCD) has been
observed in the HL-2A tokamak. This mitigation effect is very sensitive to the parameters
as the plasma density and the LHCD absorbed power, i.e., more easily to be observed for
high density and large LHCD absorbed power. The divertor peak heat load released by ELM
has been significantly reduced during the mitigation phase. The pedestal density gradient
is slightly reduced during ELM mitigation, and the plasma rotation velocity and ion
temperature are significantly reduced by LHCD. It has been found that the ELM mitigation
is not synchronized with the LHCD, while it is synchronized with the increase of the
pedestal turbulence, showing that the enhancement of the transport due to the pedestal
turbulence can be the direct cause of the ELM mitigation. |
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ISSN: | 1070-664X 1089-7674 |
DOI: | 10.1063/1.5009509 |