Observation of ELM-free H-mode in the HL-2A tokamak

For the first time, edge-localized mode (ELM)-free H-mode was realized in the HL-2A tokamak by using electron cyclotron resonance heating and co-current neutral beam injection (NBI) heating. This ELM-free H-mode is associated with the formation of edge particle transport barrier, an increase in dens...

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Veröffentlicht in:	Nuclear fusion 2013-08, Vol.53 (8), p.83030-8
Hauptverfasser:	Zhong, W.L., Zou, X.L., Duan, X.R., Ding, X.T., Dong, J.Q., Shi, Z.B., Song, X.M., Xiao, W.W., Xia, F., Huang, X.L., Dong, Y.B., Liu, Z.T., Ji, X.Q., Cheng, J., Zhou, Y., Chen, W., Yu, D.L., Han, X.Y., Cui, Z.Y., Zhang, Y.P., Xu, Y., Li, J.X., Lei, G.J., Cao, J.Y., Rao, J., Zhou, J., Huang, M., Huang, Y., Chen, L.Y., Liu, Yi, Yan, L.W., Yang, Q.W., Liu, Yong
Format:	Artikel
Sprache:	eng
Schlagworte:	Density Fluid dynamics Heating Nuclear fusion Plasma currents Tokamak devices Transport Turbulence
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Zusammenfassung:	For the first time, edge-localized mode (ELM)-free H-mode was realized in the HL-2A tokamak by using electron cyclotron resonance heating and co-current neutral beam injection (NBI) heating. This ELM-free H-mode is associated with the formation of edge particle transport barrier, an increase in density peaking and a significant decrease in edge turbulence. During the stationary ELM-free phase, an edge magnetohydrodynamic mode is identified, which has similar characteristics to an edge harmonic oscillation (EHO), as observed in other tokamaks. This EHO-like mode enhances edge particle transport, and propagates poloidally in the electron diamagnetic drift direction and toroidally in the same direction as the plasma current and NBI. A detailed analysis of this mode and the EHO-ELM transition is presented in this paper.
ISSN:	0029-5515 1741-4326
DOI:	10.1088/0029-5515/53/8/083030