Key issues for long-pulse high-βNoperation with theExperimental Advanced Superconducting Tokamak(EAST)

Gao, Xiang; Yang, Yilin; Zhang, Tao; Liu, Haiqing; Li, Guoqiang; Ming, Tingfeng; Liu, Zixi; Wang, Yumin; Zeng, Long; Han, Xingwei; Liu, Yukai; Wu, Muquan; Qu, Hao; Shen, Biao; Zang, Qing; Yu, Yaowei; Kong, Defeng; Gao, Wei; Zhang, Ling; Cai, Huishan; Wu, Xuemei; Hanada, K.; Zhong, Fubin; Liang, Y.; Hu, Chundong; Liu, Fei; Gong, Xiaojing; Xiao, Bingjia; Wan, Baonian; Zhang, Xiaodong; Li, Jiangang

doi:10.1088/1741-4326/aa626c

Cited by 56 publications

(61 citation statements)

References 27 publications

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“…In this paper, we will present the first experimental observation of RSAEs on the EAST tokamak. These modes were occasionally observed in the plasmas for developing long pulse high β N operation [29]. The internal measurement from the interferometer and ECE diagnostics determined the mode location at ρ=0.37-0.46, which is consistent with the position of q min , ρ∼0.4.…”

Section: Introductionsupporting

confidence: 66%

Experimental observation of reverse-sheared Alfvén eigenmodes (RSAEs) in ELMy H-mode plasma on the EAST tokamak

Zhang

Liu

2018

Plasma Sci. Technol.

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Reverse-sheared Alfvén eigenmodes (RSAEs) have been observed by using an interferometer and ECE diagnostics in NBI heated ELMy H-mode plasma on EAST tokamak. A typical feature of these modes is a fast frequency sweeping upward from ∼80 kHz to ∼110 kHz in hundred milliseconds during which the plasma temperature, density and rotation keeps no change. Only core channels of the interferometer can observe these modes, implying a core localized mode. The ECE measurement further showed that these modes located at about ρ=0.37-0.46, just around the position of q min with ρ∼0.4. These core localized modes are very weak in the magnetic fluctuations measured by mirnov probes mounted at the machine vacuum vessel. A multiple frequency fluctuation component, seemingly the so-called 'grand cascades', was also clearly observed on the ECE signal at ρ=0.46. During the phase, a transient internal transport barrier (ITB) in ion temperature and toroidal rotation was observed and the ITB foot was just close to the position of q min. A modulation of RSAE frequency by ELM event was observed and this modulation could be attributed to rotation decrease or q min increase due to ELM. Further study of these modes in EAST can provide valuable constraints for the q profile measurement and will be important for the long pulse operation.

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Section: Introductionsupporting

confidence: 66%

Experimental observation of reverse-sheared Alfvén eigenmodes (RSAEs) in ELMy H-mode plasma on the EAST tokamak

Zhang

Liu

2018

Plasma Sci. Technol.

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“…Yang reported the first experimental observation of ITB formation in the EAST tokamak [16]. He made an analysis of an EAST discharge (shot No.…”

Section: Lh Transition and Itb Formationmentioning

confidence: 99%

Summary of the 6th asia-pacific transport working group (APTWG) meeting

et al. 2017

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This report summarizes the contributions to, and discussions at, the 6th Asia-Pacific Transport Working Group (APTWG) meeting, held on 21-25 June 2016 at Korea University, Seoul, Republic of Korea. The objective of the meeting was to develop an integrated understanding of transport phenomena in magnetically confined plasmas. To accomplish this objective, four technical working groups were organized under the headings: (1) turbulence suppression and transport bifurcation, (2) effect of magnetic topology on transport and magnetohydrodynamicsturbulence interaction, (3) nonlocality and non-diffusive transport, and (4) Energetic particles and particle/impurity transport. A summary is also given of the three plenary review talks on impurity transport, the magnetohydrodynamics relaxation process in reversed field pinch, and recent experimental and modelling results on the quiescent H-mode operation.

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“…Noticeably, the τ imp in the small ELMy H-mode showing a level close to L-mode discharges is apparently shorter than that in HER H-mode discharges. [13,48,49] With the sufficient central heating and well controlled impurities [50] in this small ELMs regime, a higher β N ∼ 1.7 can be obtained. Generally, in EAST routine discharges with this combined heating regime (P LHW > 1.7 MW and P ECRH > 0.5 MW), small ELMy H-mode with f ELM = 0.5 kHz-1.4 kHz can be accessed.…”

Section: Impurity Confinement In Lhw and Ecrh Heated Small Elmy H-mod...mentioning

confidence: 93%

Reduction of impurity confinement time by combined heating of LHW and ECRH in EAST*

Xu¹,

Wu²,

Zhang³

et al. 2021

Chinese Phys. B

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The core impurity confinement properties are experimentally investigated in the Experimental Advanced Superconducting Tokamak (EAST) plasma heated by lower hybrid wave (LHW) and electron cyclotron resonance heating (ECRH) (LHW+ECRH). It is shown that the impurity confinement time (τ imp) in the L-mode plasma jointly heated by LHW and ECRH is weakly dependent on electron density but strongly dependent on the heating power, thus it is shorter than that in LHW-only heated L-mode plasma with the similar plasma parameters. The combined heating of LHW and ECRH can reduce the collisionality and indicates a more effective heating method for core τ imp reduction and normalized poloidal beta (β P) improvement. It should be emphasized that in this high β P operation window the small ELM regime can be accessed, and an L-mode level τ imp (40 ms–80 ms) and high β N (∼ 1.7) can be obtained simultaneously. It means that this typical small ELMy H-mode regime has an advantage in avoiding the serious tungsten accumulation, and will be competitive in future long-pulse steady-state and high-performance operation with high-Z material plasma-facing components.

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Key issues for long-pulse high-β_Noperation with theExperimental Advanced Superconducting Tokamak(EAST)

Cited by 56 publications

References 27 publications

Experimental observation of reverse-sheared Alfvén eigenmodes (RSAEs) in ELMy H-mode plasma on the EAST tokamak

Experimental observation of reverse-sheared Alfvén eigenmodes (RSAEs) in ELMy H-mode plasma on the EAST tokamak

Summary of the 6th asia-pacific transport working group (APTWG) meeting

Reduction of impurity confinement time by combined heating of LHW and ECRH in EAST*

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