Design and Test of an Antenna Module Mock-Up for the EAST 4.6 GHz LHCD Launcher

Jia, H.; Liu, Fukun; Liu, Liang; Min, Cheng

doi:10.1088/1009-0630/15/8/23

Cited by 16 publications

(4 citation statements)

References 10 publications

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“…It is equipped with a molybdenum first wall, a graphite lower divertor and an ITER-like tungsten upper divertor. The four auxiliary heating methods include LHWs [32], ion cyclotron resonance heating [33], ECRH [34], and neutral beam injection (NBI) [35]. The line-integrated electron density can be measured by the 11-channel polarimeter interferometer (POINT) arrays [36], which are distributed uniformly along the vertical direction with a vertical distance of 8.5 cm between adjacent beams.…”

Section: Methodsmentioning

confidence: 99%

Multiple Alfvén eigenmodes induced by energetic electrons and nonlinear mode couplings in EAST radio-frequency heated H-mode plasmas

et al. 2021

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Multiple electromagnetic coherent modes with frequencies f ∼ 20–300 kHz and toroidal mode numbers n = 1 and n = 2 have been observed and investigated in radio-frequency heated H-mode plasmas of the EAST tokamak. The experimental results show that the two main branches of these coherent modes are driven by energetic electrons (EEs), which are produced in the processes of radio-frequency current drive and heating. Bicoherence analysis indicates that there are strong nonlinear mode interactions between the two branches (mother waves), i.e. one is in the low-frequency range of f ∼ 20–50 kHz and the other one is in the high-frequency range of f ∼ 120–250 kHz, and their nonlinear couplings can generate many harmonics (daughter waves). Both coherent modes propagate poloidally along the electron diamagnetic drift direction. The gyrokinetic eigenvalue simulations support the view that both the low-frequency and the high-frequency coherent modes observed in EAST are Alfvén eigenmode (AE) type, and the kinetic effects of background plasmas and EEs are responsible for the formation and excitation of AEs, respectively. The low-frequency coherent mode is identified as the kinetic beta-induced Alfvén eigenmode located in the edge, and the high-frequency coherent mode is radially global, which is characterized by a toroidal Alfvén eigenmode (TAE) in the core and also has the components of a kinetic TAE and ellipticity-induced Alfvén eigenmode in the outer region due to the large downshift of the Alfvén continuum gap from the core to the edge in H-mode discharges.

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Section: Methodsmentioning

confidence: 99%

Multiple Alfvén eigenmodes induced by energetic electrons and nonlinear mode couplings in EAST radio-frequency heated H-mode plasmas

et al. 2021

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“…are integrated inside the vacuum vessel [4,7] . In addition, high power continuous wave (CW) of Lower Hybrid Current Drive (LHCD) system at 2.45 GHz [8,9] and 4.6 GHz [10,11] , plus the newly developed Electron Cyclotron Heating (ECH) [12] at 140 GHz are routinely used for plasma current drive and heating.…”

Section: Introductionmentioning

confidence: 99%

Integrated Operating Scenario to Achieve 100-Second, High Electron Temperature Discharge on EAST

Qian

Gong

Wan

et al. 2016

Plasma Sci. Technol.

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Stationary long pulse plasma of high electron temperature was produced on EAST for the first time through an integrated control of plasma shape, divertor heat flux, particle exhaust, wall conditioning, impurity management, and the coupling of multiple heating and current drive power. A discharge with a lower single null divertor configuration was maintained for 103 s at a plasma current of 0.4 MA, q95 ≈7.0, a peak electron temperature of >4.5 keV, and a central density ne(0)∼ 2.5×10 19 m −3. The plasma current was nearly non-inductive (V loop <0.05 V, poloidal beta ∼ 0.9) driven by a combination of 0.6 MW lower hybrid wave at 2.45 GHz, 1.4 MW lower hybrid wave at 4.6 GHz, 0.5 MW electron cyclotron heating at 140 GHz, and 0.4 MW modulated neutral deuterium beam injected at 60 kV. This progress demonstrated strong synergy of electron cyclotron and lower hybrid electron heating, current drive, and energy confinement of stationary plasma on EAST. It further introduced an example of integrated "hybrid" operating scenario of interest to ITER and CFETR.

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“…为了进一步提升非感应电流驱动的能力, 从容地实现等离子体电流全波驱动(磁通零消耗), 进而达到长脉冲稳态运行的目的 [9] , 2.45 GHz低杂波源功率首先由2 MW提升至了4 MW. 2014年, 又新增一套源功率6 MW, 电流驱动效率更高的4.6 GHz 的低杂波加热系统 [10,11] . 其主体结构包括: 微波源、传输馈线、天线三部分.…”

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Advances in experimental research towards high confinement and steady state operation on the Experimental Advanced Superconducting Tokamak

Wan¹,

Xu²

2019

Sci. Sin.-Phys. Mech. Astron.

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Design and Test of an Antenna Module Mock-Up for the EAST 4.6 GHz LHCD Launcher

Cited by 16 publications

References 10 publications

Multiple Alfvén eigenmodes induced by energetic electrons and nonlinear mode couplings in EAST radio-frequency heated H-mode plasmas

Multiple Alfvén eigenmodes induced by energetic electrons and nonlinear mode couplings in EAST radio-frequency heated H-mode plasmas

Integrated Operating Scenario to Achieve 100-Second, High Electron Temperature Discharge on EAST

Advances in experimental research towards high confinement and steady state operation on the Experimental Advanced Superconducting Tokamak

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