Predictive simulations of operation scenarios for EAST with METIS code

Upgraded heating and current drive (H/CD) systems have been equipped on the Experimental Advanced Superconducting Tokamak (EAST). With the upgraded H/CD systems, the operation space of EAST is extended, and the ability to achieve higher performance is improved. In this paper, a 0.5 dimension transport code named Minute Embedded Tokamak Integrated Simulator (METIS) is applied to predict the EAST operation space and to assess the current drive capability of the 4.6 GHz lower hybrid current drive system. Predictive simulation of several EAST scenarios, including steady-state high confinement mode (H-mode), advanced regime, high normalized beta and high electron temperature, are also performed with the available H/CD systems. The simulation results provide a guidance for forthcoming advanced EAST experiments.

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Studies of challenge in lower hybrid current drive capability at high density regime in experimental advanced superconducting tokamak

Journal of Plasma Physics ◽

10.1017/s0022377817000010 ◽

2017 ◽

Vol 83 (1) ◽

Cited By ~ 1

Author(s):

B. J. Ding ◽

M. H. Li ◽

Y. C. Li ◽

M. Wang ◽

F. K. Liu ◽

...

Keyword(s):

Current Drive ◽

High Density ◽

Lower Hybrid ◽

Lower Hybrid Wave ◽

Cyclic Operation ◽

Lower Hybrid Current Drive ◽

Plasma Coupling ◽

Superconducting Tokamak ◽

Confinement Mode ◽

Density Regime

Aiming at a fusion reactor, two issues must be solved for the lower hybrid current drive (LHCD), namely good lower hybrid wave (LHW)–plasma coupling and effective current drive at high density. For this goal, efforts have been made to improve LHW–plasma coupling and current drive capability at high density in experimental advanced superconducting tokamak (EAST). LHW–plasma coupling is improved by means of local gas puffing and gas puffing from the electron side is taken as a routine way for EAST to operate with LHCD. Studies of high density experiments suggest that low recycling and high lower hybrid (LH) frequency are preferred for LHCD experiments at high density, consistent with previous results in other machines. With the combination of 2.45 GHz and 4.6 GHz LH waves, a repeatable high confinement mode plasma with maximum density up to $4.5\times 10^{19}~\text{m}^{-3}$ was obtained by LHCD in EAST. In addition, in the first stage of LHCD cyclic operation, an alternative candidate for more economical fusion reactors has been demonstrated in EAST and further work will be continued.

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Observation of a new turbulence-driven limit-cycle state in H-modes with lower hybrid current drive and lithium-wall conditioning in the EAST superconducting tokamak

Nuclear Fusion ◽

10.1088/0029-5515/52/12/123011 ◽

2012 ◽

Vol 52 (12) ◽

pp. 123011 ◽

Cited By ~ 12

Author(s):

H.Q. Wang ◽

G.S. Xu ◽

H.Y. Guo ◽

B.N. Wan ◽

V. Naulin ◽

...

Keyword(s):

Limit Cycle ◽

Current Drive ◽

Lower Hybrid ◽

Lower Hybrid Current Drive ◽

Superconducting Tokamak

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The Design of High Voltage DC Power Supply of 4.6GHZ/500MW LHCD

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.135-136.1027 ◽

2011 ◽

Vol 135-136 ◽

pp. 1027-1036 ◽

Cited By ~ 1

Author(s):

Xu Hao ◽

Yi Yun Huang

Keyword(s):

Steady State ◽

Power Supply ◽

Power Supply System ◽

Heating System ◽

Power Source ◽

Supply System ◽

Current Drive ◽

Lower Hybrid ◽

Dc Power ◽

Lower Hybrid Current Drive

The steady-state and transient performances of the power supply system of LHCD (Lower Hybrid Current Drive) heating system are highly demanded which makes it difficult to design the power source. In this thesis, the method of designing the 4.6GHZ/6MW power source of LHCD of EAST is discussed. And the results of the experiment are provided and some special characteristics are analysed to prove the accuracy of the method.

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