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Southwestern Institute of Physics Annual Report 2004年第1期 22-24页

作者： SUN Ping PAN Chuanhong CUI Zhengying WANG Quanming HONG Wenyu

Interactions of plasma with the walls lead to particle release by various mechanisms and the amount of impurities in the plasma core limits the performance of the device. It is very important to get the particle fluxes for understanding the releasing mechanisms of impurities. The spectroscopic measurements to determine the impurity influx from localized surfaces in tokamak plasma is described in detail in Ref. Determined the origin of the chromium influxes by this method in ASDEX during ICRF heating were reported in Ref.

关键词： Divertor particle flux

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A novel optical emission spectroscopy method for diagnostics of contribution of different ionization mechanisms and flux of ions in different valences in discharge channel of a Hall thruster

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Chinese Journal of Aeronautics 2024年第4期37卷 294-307页

作者： Yanfei WANG Ximing ZHU Renqiu ZOU Shilin YAN Junwei JIA Zhongxi NING Daren YU School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Aerospace Plasma Propulsion Ministry of Industry and Information TechnologyHarbin 150001China Beijing Orient Institute of Measurement and Test Beijing 100094China Beijing Aerospace Long March Aircraft Research Institute Beijing 100076China

The mass application of Hall thrusters poses the need for a diagnostic method of ionization mechanism in the discharge channel to boost the iteration and optimization of thruster *** work presents an Optical Emission Spectroscopy (OES) method for diagnostics of the contribution of different ionization mechanisms and the flux of ions in different valences in the discharge channel of a Hall *** emission spectra in the discharge channel are analyzed by jointly utilizing a collisional-radiative model,an ionization-excitation model,and a flux-conservation *** is found that the intensities of some spectral lines can be converted into the reaction rates of collision processes,e.g.,electron-induced excitation and ionization *** latter can further be used to determine the evolutions of particle fluxes by utilizing the conservation law of *** novel method is demonstrated on a kilo-watt Hall *** evolutions of several parameters are determined using this method along the discharge channel,including the ionization rates of different mechanisms,particle fluxes,particle densities,and particle *** novel method can be further developed by being jointly utilized with spectral imaging and tomography techniques,enabling diagnostics of multi-dimensional distributions of the above-mentioned parameters in the discharge channel and near-field plume.

关键词： Hall thruster Optical emission spectroscopy Ionization mechanism particle flux Divalent ion

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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

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Modification of Boundary Fluctuations by LHCD in the HT—7 Tokamak

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Chinese Physics Letters 2003年第6期20卷 865-868页

作者： SONGMei WANBao-Nian XUGuo-Sheng LINGBi-Li InstituteofPlasmaPhysics ChineseAcademyofSciencesPOBox1126Hefei230031

Measurements of boundary fluctuations and fluctuation driven electron fluxes have been performed in ohmic and lower hybrid current drive enhanced confinement plasma using a graphite Langmuir probe array on HT-7 tokamak. The fluctuations are significantly suppressed and the turbulent fluxes are remarkably depressed in the enhanced plasma. We characterized the statistical properties of fluctuations and the particle flux and found a non-Gaussian character in the whole scrape-off layer with minimum deviations from Gaussian in the proximity of the velocity shear layer in ohmic plasma. In the enhanced plasma the deviations in the boundary region are all reduces obviously. The fluctuations and induced electron fluxes show sporadic bursts asymmetric in time and the asymmetry is remarkably weakened in the lower hybrid current driving (LHCD) phase. The results suggest a coupling between the statistical behaviour of fluctuations and the turbulent flow.

关键词： Ohmic current drive HT-7 TOKAMAK boundary regions particle flux Turbulent Flow Non-Gaussian fluctuations SHEAR VELOCITY Tokamak devices Electron flux MODIFICATION

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