The Role of Lithium Conditioning in Achieving High Performance, Long Pulse H-mode Discharges in the NSTX and EAST Devices
Authors: R. Maingi, D.K. Mansfield, X.Z. Gong, Z. Sun, M.G. Bell, Y.M. Duan, et al.
Abstract: In this paper, the role of lithium wall conditioning on the achievement of high performance, long pulse discharges in the National Spherical Torus Experiment (NSTX) and the Experimental Advanced Superconducting Tokamak (EAST) is documented. Common observations include recycling reduction and elimination of ELMs. In NSTX, lithium conditioning typically resulted in ELM-free operation with impurity accumulation, which was ameliorated e.g. with pulsed 3D fields to trigger controlled ELMs. Active lithium conditioning in EAST discharges has overcome this problem, producing an ELM-free Hmode with controlled density and impurities.
_________________________________________________________________________________________________
Presented at: the 25th IAEA Fusion Energy Conference, St. Petersburg, Russia, 13-18 October 2014.
Published as: 25th IAEA Fusion Energy Conference Proceedings [EX/P6-54] on IAEA Physics website
_________________________________________________________________________________________________
Download PPPL-5077 (pdf 5.9 MB / 8 pp)
_________________________________________________________________________________________________