Speaker
A. Casolari
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/O4.104.pdf
Study progress of challenge in LHCD capability
at high density regime in EAST
B. J. Ding1, M. H. Li1, R. Cesario2, A. A. Tuccillo2, A. Cardinali2, Y. C. Li1, M. Wang1, P.
Bonoli3, R. Parker3, S. G. Baek3, A. Ekedahl4, M. Goniche4, J. Hillairet4, Y. Peysson4, X. L.
Zou4, Y. Yang1, H. Q. Liu1, L. Wang1, S. Y. Lin1, Y. F. Wang1, C. B. Wu1, L. Liu1, L. M. Zhao1,
H. C. Hu1, H. Lian1, J. C. Xu1, Q. Q. Yang1, F. Napoli2, C Castaldo2, J F Shan1, F K Liu1, X Z
Gong1, J G Li1, B N Wan1, and the EAST Team
1
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
2
ENEA, Fusion and Nuclear Safety Department, C. R. Frascati, Via E. Fermi 45, 00044
Frascati , Italy
3
MIT Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA
4
CEA, IRFM, 13108 St. Paul-lez-Durance, France
Aiming at fusion reactor, two issues must be solved for lower hybrid current drive (LHCD),
namely good lower hybrid wave (LHW)-plasma coupling and effective current drive at high
density. For this goal, effort has been done continuously in EAST. Investigation indicates that
gas puffing from electron-side of the LH antenna is more efficient for LHW-plasma coupling
[1]. Studies of high density experiments suggest that low recycling and high LH frequency are
preferred for LHCD at high density, mainly due to the reduction of parasitic effects in edge
region [2-4]. Recently, it is observed for the first time that LHCD characteristics are in
agreement with the edge current profile and strike-point splitting behaviour, demonstrating the
role and mitigation of parasitic effects in LHCD at higher frequency wave. With the
combination of 2.45GHz and 4.6GHz LH wave, repeatable H-mode plasma with the
maximum density up to .4.5×1019m-3 was obtained [5]. By means of LHCD, ECRH, and
ICRH, fully non-inductive H-mode discharges over 100s have been achieved.
[1] B J Ding et al., Phys. Plasma 20, 102504 (2013). [2] B J Ding et al., Nucl. Fusion 53, 113027 (2013). [3] B J
Ding et al., Nucl. Fusion 55, 093030 (2015). [4] M H Li, B J Ding et al., Phys. Plasma 23, 102512 (2016) [5] B J
Ding et al., Nucl. Fusion 57, 022022 (2017).
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