Yonggao Li

Radial propagation of ELM-filaments and boundary turbulence characteristics with divertor heat flux mitigation in the small ELM regime on HL-2A

Ting Wu, Lin Nie, Z. H. Wang, Jinming Gao et autres

Abstract This paper investigates the radial propagation of ELM-filaments and boundary turbulence characteristics with divertor heat flux mitigation in the small ELM regime on HL-2A. Divertor nitrogen seeding mitigates divertor heat flux while maintaining high plasma performance (H_98>1.0 and β_N>2.0) and negligible …

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Density limit experiments and core-localized kinetic ballooning modes in HL–2A Ohmic heating plasmas

Liwen Hu, Wei Chen, P.W. Shi, Ting Long et autres

Abstract The density limit is a mysterious barrier to magnetic confinement nuclear fusion, and is still an unresolved issue. In this paper, we will present the experimental results of the density limit and core-localized kinetic magnetohydrodynamics (MHD) instabilities on HL–2A. Firstly, the …

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Development of the FIR laser Polarimeter/Interferometer on HL-3 tokamak

Xi Chen Feng, Pengfei Zhang, Yuan Li, Junren 俊任 MOU 牟 et autres

Abstract The Polarimeter/Interferometer is one of the largest diagnostics in magnetic confinement fusion device for simultaneous electron density and current density measurement. Developments have been made in two key aspects of the far-infrared laser Polarimeter/Interferometer system on HL-3 tokamak. First, in laser …

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Interpretation of ion cyclotron emission in the HL-2A tokamak

L.Z. Liu, Ruihai Tong, Haozhe Kong, Huasheng Xie et autres

Abstract We report the first interpretation of ion cyclotron emission (ICE) based on the frequency variation in HL-2A tokamak experiments. The measured frequencies of ICE are concentrated around the ion cyclotron frequency, while simultaneously exhibiting a linear scaling with the Alfvén velocity. …

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Integrated modeling and experimental validation of H-mode divertor detachment and core confinement compatibility on HL-2A tokamak

SHU Yukun, Xu Xin-Liang, Xueke Wu, Zhuo Wang et autres

The divertor detachment and heat flux control under high-confinement H-mode conditions in tokamaks represent critical physical challenges in current magnetic confinement fusion research. Understanding the influence of detachment on H-mode boundary transport physics, particularly its compatibility with core confinement, is central to …

Compatibility of pronounced detachment with improved confinement on HL-2A tokamak

Ting Wu, Min Xu, Zhuo Wang, Lin Nie et autres

Abstract This paper investigates the compatibility of pronounced detachment with improved confinement based on the NBI-heated HL-2A L-mode plasma with low-density. Through impurity seeding, radiation becomes higher at plasma edge and causes edge cooling after pronounced detachment. Turbulent transport is examined in …

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Interaction between MTM and EGAM for energy and particle confinement improvements on HL-3 tokamak

Shiqin Wang, Xiao Lan Zou, Xuru Duan, A.S. Liang et autres

Abstract We report the first observation of microtearing mode (MTM) and its interaction with energetic-particle-induced geodesic acoustic mode (EGAM) in the reduction of ambient turbulence, leading to improvements in energy and particle confinements in electron cyclotron resonance heating (ECRH) plasma on HL-3 …

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Impurity convection reversal caused by edge localized turbulence for generating a stationary edge radiative layer in the HL-2A tokamak

Guanqun Xue, W.L. Zhong, Zheng‐Xiong Wang, Xiao Lan Zou et autres

Abstract The effect of impurity on edge turbulence was investigated on the HL-2A tokamak using neon supersonic molecular beam injection (SMBI). For the first time, a stationary radiative layer accompanied by edge localized turbulence (ELT) lasting more than 100 ms is observed …

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Integrated analysis of high-βN double transport barriers scenario on HL-2A

Zhengji Li, Wei Chen, A.P. Sun, Liming Yu et autres

Tokamak is considered as the most promising experimental setup for achieving controllable nuclear fusion requirements. The parameter \begin{document}$\beta_{\rm{N}}$\end{document} is an important parameter for tokamak devices: high \begin{document}$\beta_{\rm{N}}$\end{document} benefits not only to plasma fusion but also to the enhancement of fusion reaction efficiency …

Electron density measurement by the three boundary channels of HCOOH laser interferometer on the HL-3 tokamak

Junren 俊任 MOU 牟, Yonggao Li, Yuan 远 LI 李, Zaihong Wang et autres

Abstract Far-infrared (FIR) interferometer is widely used to measure the electron density in the magnetically confined fusion plasma devices. A new FIR laser interferometer with a total of 13 channels (8 horizontal channels and 5 oblique channels) is under development on the …

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Long radial coherence of electron temperature fluctuations in non-local transport in HL-2A plasmas

Zhongbing 中兵 Shi 石, K.R. Fang, Jingchun 景春 Li 李, Xiaolan Zou et autres

The dynamics of long-wavelength (kθ < 1.4 cm−1), broadband (20 kHz–200 kHz) electron temperature fluctuations ( <?CDATA ${\mathop{T}\limits^{\sim }}_{{\rm{e}}}/{T}_{{\rm{e}}}$?> T ∼ e / T e ) of plasmas in gas-puff experiments are observed for the first time in HL-2A tokamak. In a …

Long radial coherence of electron temperature fluctuations in non-local transport in HL-2A plasmas

Z.B. Shi, K.R. Fang, Jingchun Li, Zhaoyang Lu et autres

The dynamics of long-wavelength ($k_θ<1.4 \mathrm{\ cm^{-1}}$), broadband (20-200 kHz) electron temperature fluctuations ($\tilde T_e/T_e$) of plasmas in gas-puff experiments were observed for the first time in HL-2A tokamak. In a relative low density ($n_e(0) \simeq 0.91 \sim 1.20 \times10^{19}/m^3$) scenario, after …