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The tri-band high spectral resolution spectrometer with gratings in tandem for the charge-exchange recombination spectroscopy diagnostic system on hl-2a tokamak

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Plasma Science and Technology 2024年第6期26卷 103-110页

作者：刘亮余德良马倩何小斐 Maarten DE BOCK Manfred von HELLERMANN Michael WALSH 陈文锦何小雪魏彦玲张能李栋魏会领 the hl-2a team Southwestern Institute of Physics Chengdu 610041People’s Republic of China College of Physics and Optoelectronic Technology Baoji University of Arts and SciencesBaoji 721000People’s Republic of China ITER Organization Route de Vinon-sur-VerdonCS 90046St.Paul Lez Durance Cedex 13067France Fusion Spectroscopy Markgraf-Albrecht Str.14Berlin 10711Germany

Charge-exchange(CX) recombination spectroscopy is a powerful tool monitoring ion temperature and plasma rotation with good temporal and spatial resolutions. A compact, new design for a high-throughput, tri-band high spectral resolution spectrometer has been developed for the charge-exchange recombination spectroscopy measurement on the hl-2a tokamak. The simultaneous measurements of He II(468.57 nm), C VI(529.1 nm), and Dα(656.1 nm accompanied by beam emission spectra) with an acquisition frequency up to 400 Hz are achieved by vertically binning the spectrum from each fiber in experiments. Initial results indicate that the system can provide radial profiles of not only ion temperature and rotation velocity,but also concentration of carbon. For the case of helium, the measurements for the ion temperature and rotation velocity are straightforward but the apparent concentration associated with the observed CX intensity is obviously too high. Modeling of the active He II CX feature including plume contributions needs to be carried out to extract the true helium *** spectrometer could become a prototype for the ITER charge-exchange recombination spectroscopy diagnostic and the pilot experiments, as presented here, demonstrate the possibility of impurity concentrations measurements based on the combined measurement of local beam emission and charge-exchange recombination spectroscopy spectra.

关键词： CXRS ion temperature plasma rotation impurity concentration

Characterization of plasma current quench during disruptions at hl-2a

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Plasma Science and Technology 2017年第5期19卷 1-5页

作者：竹锦霞张轶泼董云波 hl-2a team School of Intelligent Manufacturing Sichuan University of Arts and ScienceDazhou 635000People'sRepublic of China Southwestern Institute of Physics Chengdu 610041People's Republic of China 不详

The most essential assumptions of physics for the evaluation of electromagnetic forces on the plasma-facing components due to a disruption-induced eddy current are characteristics of plasma current quenches including the current quench rate or its waveforms. The characteristics of plasma current quenches at hl-2a have been analyzed during spontaneous disruptions. Both linear decay and exponential decay are found in the disruptions with the fastest current ***, there are two stages of current quench in the slow current quench case. The first stage with an exponential decay and the second stage followed by a rapid linear decay. The faster current quench rate corresponds to the faster movement of plasma displacement. The parameter regimes on the current quench time and the current quench rates have been obtained from disruption statistics at hl-2a. There exists no remarkable difference for distributions obtained between the limiter and the divertor configuration. This data from hl-2a provides basic data of the derivation of design criteria for a large-sized machine during the current decay phase of the disruptions.

关键词： tokamak disruption current quench

Study of nonlinear mode–mode couplings between Alfvénic modes by the Fourier bicoherence and Lissajous-curve technique in hl-2a

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Plasma Science and Technology 2019年第7期21卷 97-105页

作者： Yumei HOU Wei CHEN Yi YU Xuru DUAN Min XU Minyou YE hl-2a team School of Physical Sciences University of Science and Technology of ChinaHefei 230026People’s Republic of China Southwestern Institute of Physics Chengdu 610041People’s Republic of China

Nonlinear couplings of various Alfvén modes driven by energetic particles in hl-2 A are addressed by employing the Fourier bicoherence and Lissajous-curve technique. Long-lived modes and high-frequency coherent modes are presented. Then the squared bicoherence of three waves establishes the existence of three-wave coupling. Lissajous-curves of those waves manifest that their phases are locked, which again confirms that they are nonlinearly coupled to each other. Moreover, coupled modes triggered by supersonic molecular beam injection are investigated. The phase evolution of them is given by the Lissajous-curve. Further details of phase-flip and phase-slip are presented and discussed.

关键词： nonlinear mode-mode coupling Alfvén modes Fourier bicoherence Lissajous-curve

Application of the Magnetic Surface Based PARK-Matrix Method in the HCOOH Laser Interferometry System on hl-2a

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Plasma Science and Technology 2016年第12期18卷 1198-1203页

作者：李永高周艳袁保山邓中朝张博宇李远邓玮王浩西易江 hl-2a team Southwestern Institute of Physics Chengdu 610041 China

A new electron density profile reconstruction procedure based on the PARK-matrix method has been firstly exploited for the multi-chord formic acid（HCOOH, λ=432.5 μm） laser interferometry system on the hl-2a tokamak. According to the geometric coordinates of the magnetic surfaces reconstructed by the CF（current fitting） code and the assumption that the electron density between two adjacent magnetic surfaces is a constant, the local electron density is calculated layer by layer, and the electron density profile n_e（Z） can be determined, as well as the density profile n_e（R）. The simulation result indicates that the error of the PARK-matrix method is acceptable for the four-chord HCOOH laser interferometer. In the applications, it shows that the reconstructed electron density profile agrees well with the microwave reflectometry measurement,and the sawtooth reversion radius is consistent with that deduced from the soft X-ray ***, the electron density profiles with electron cyclotron resonance heating（ECRH） and supersonic molecular beam injection（SMBI） are also reconstructed and analyzed.

关键词： electron density profile interferometer PARK-matrix method hl-2a

Status and Plan of the hl-2a Project

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中国核科技报告 2002年 865-873页

作者： YAN Jiancheng ZHOU Caipin LIU Yong LIU Dequan the hl-2a team

hl-2a is a new divertor tokamak under construction at Southwestern Institute of Physics (SWIP), Chengdu, China, based on the experience from hl-1[1] and hl-1M[2, 3]. hl is the short term of a Chinese word that means "Toroidal Current Device". The main objectives of hl-2a are to produce more adaptable divertor configurations to study energy exhaust and impurity control (the first divertor

关键词： hl-2a Project Installation

Multi-scale interaction between tearing modes and micro-turbulence in the hl-2a plasmas

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Plasma Science and Technology 2020年第8期22卷 1-7页

作者： Min JIANG Yuhong XU Zhongbing SHI Wulyu ZHONG Wei CHEN Rui KE Jiquan LI Xuantong DING Jun CHENG Xiaoquan JI Zengchen YANG Peiwan SHI Jie WEN Kairui FANG Na WU Xiaoxue HE Anshu LIANG Yi LIU Qingwei YANG Min XU hl-2a team Southwestern Institute of Physics Chengdu 610041People's Republic of China Institute of Fusion Science School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031People's Republic of China School of Physics Dalian University of TechnologyDalian 116024People's Republic of China

The influence of m/n=2/1(m and n are poloidal and toroidal mode numbers)tearing modes on plasma perpendicular flows and micro-fluctuations has been investigated in hl-2a neutral beam injection heated L-mode *** is found that the local perpendicular rotation velocity and turbulence energy are modulated by the alternation between the island X-point and O-point of the naturally rotating tearing ***-correlation analysis indicates that the modulation of density fluctuations by the tearing mode is not only limited to the island region,but also occurs in the edge region near the last closed flux *** turbulence exhibits distinct spectral characteristics inside and outside the island *** addition,it is observed that the particle flux near the strike point is also significantly impacted by the tearing *** experimental evidence reveals that there are strong core-edge interactions between the core tearing modes and the edge transport.

关键词： tearing modes turbulence particle flux modulation core-edge interaction

Favourable scenarios established by SMBI for the realization of the ELMy H-mode at hl-2a

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Chinese Physics B 2017年第8期26卷 284-292页

作者：崔正英徐媛冯北滨许宇鸿丁玄同季小全李永高石中兵钟武律蒋敏宋绍栋程均高金明曹建勇董春凤张凯陈程远黄梅杨青巍段旭如 hl-2a team Southwestern Institute of Physics Chengdu 610225China

The ELMy H-mode plasmas realized with the supersonic molecular beam injection（SMBI） are studied in relation to the energy confinement and the heating power for the L–H transition（P_（L-H）） in the hl-2a tokamak. A database is assembled for this study based on the ELMy H-mode discharges during the experimental campaigns in the period 2009–2013at the hl-2a tokamak. The statistical results show that the SMBI is favourable for reaching the H-mode by reducing the heating power at the L–H transition and for the H-mode performance by improving the energy confinement compared with the ordinary gas puffing（GP）. The reduction of P_（L-H） is about 20% when the density is low, and the energy confinement enhancement factor of H_（H98y2）= τ_E/τ_（th,98y2） ≈ 1.5 is achieved with the SMBI. Note that in the database the density dependence of P_（L-H） is non-monotonic with the ˉne,min≈ 3×10^（19） m^（-3） at which the P_（L-H） is minimum. Most of P_（L-H） data are on the low density branch where the P_（L-H） increases with the decrease in density. The minimum of the P_（L-H） in hl-2a is comparable to the ITPA multi-machine threshold power scaling P_（thr_scal08）. The physics behind the reduction of the P_（L-H） with the SMBI is also investigated in relation to the change of the density gradient at the plasma edge, the gas fuelling efficiency, and the recycling.

关键词： ELMy H-mode SMBI L-H transition energy confinement database

China’s hl-3 tokamak achieves H-mode operation with 1 MA plasma current

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The Innovation 2024年第4期5卷 5-6页

作者： Wulyu Zhong hl-team Southwestern Institute of Physics Chengdu 610225China

In a remarkable achievement,China’s new-generation magnetic confinement fusion device,the hl-3 tokamak(formerly known as hl-2M),achieved highconfinement mode(H-mode)operation with a plasma current of 1 mega amperes(MA)for the first time on August 25th,*** breakthrough signifies a noteworthy milestone in China’s controlled nuclear fusion research,bringing us one step closer to the burning plasma phase.

关键词： tokamak mode bringing

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hl-2a等离子体边缘极向剩余胁强的研究

核聚变与等离子体物理 2018年第1期38卷 1-7页

作者：龙婷聂林柯锐许敏吴一帆郭栋王占辉袁博达龚少博刘灏 hl-2a团队核工业西南物理研究院成都610041

首次报导了托卡马克等离子体边缘与湍流相关的极向剩余胁强剖面的测量结果。采用外中平面往复式静电探针阵列对hl-2a托卡马克边缘的极向湍流动量输运进行研究。在没有外部动量注入的欧姆放电下,剩余胁强为有限值、且其空间剖面在等离子... 详细信息

首次报导了托卡马克等离子体边缘与湍流相关的极向剩余胁强剖面的测量结果。采用外中平面往复式静电探针阵列对hl-2a托卡马克边缘的极向湍流动量输运进行研究。在没有外部动量注入的欧姆放电下,剩余胁强为有限值、且其空间剖面在等离子体边缘具有明显的径向梯度,表明托卡马克等离子体边缘存在极向动量源。由动量源产生的动量主要以扩散形式向与剩余胁强相反的方向传播,最终的结果是等离子体边缘存在有限的雷诺胁强。在最后闭合磁面以内0.5~2cm区域,剩余胁强的梯度提供自发旋转的力矩,由该力矩引起的动量产生与由速度梯度引起的动量扩散共同导致了雷诺胁强出现负梯度,造成动量沉积,从而驱动极向平衡流。

关键词：湍流极向动量输运极向旋转剩余胁强静电探针托卡马克等离子体