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Line identification of extreme ultraviolet (euv) spectra from low-Z impurity ions in EAST tokamak plasmas

Plasma Science and Technology 2021年第7期23卷 15-30页

作者： Lei LI Ling ZHANG Zong XU Shigeru MORITA Yunxin CHENG Fengling ZHANG Wenmin ZHANG Yanmin DUAN Qing ZANG Shouxin WANG Shuyu DAI Guizhong ZUO Zhen SUN Liang WANG Xiaobin DING Jinping QIAN Haiqing LIU Liqun HU Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031People’s Republic of China University of Science and Technology of China Hefei 230026People’s Republic of China Advanced Energy Research Center Shenzhen UniversityShenzhen 518060People’s Republic of China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China National Institute for Fusion Science Toki 509-5292GifuJapan Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Ministry of Education)School of PhysicsDalian University of TechnologyDalian 116024People’s Republic of China Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province College of Physics and Electronic EngineeringNorthwest Normal UniversityLanzhou 730070People’s Republic of China

Extreme ultraviolet(euv) spectra emitted from low-Z impurity ions in the wavelength range of10–500Å were observed in Experimental Advanced Superconducting Tokamak(EAST)discharges. Several spectral lines from K-and L-shell partially ionized ions were successfully observed with sufficient spectral intensities and resolutions for helium, lithium, boron, carbon,oxygen, neon, silicon and argon using two fast-time-response euv spectrometers of which the spectral intensities are absolutely calibrated based on the intensity comparison method between visible and euv bremsstrahlung continua. The wavelength is carefully calibrated using wellknown spectra. The lithium, boron and silicon are individually introduced for the wall coating of the EAST vacuum vessel to suppress mainly the hydrogen and oxygen influxes from the vacuum wall, while the carbon and oxygen intrinsically exist in the plasma. The helium is frequently used as the working gas as well as the deuterium. The neon and argon are also often used for the radiation cooling of edge plasma to reduce the heat flux onto the divertor plate. The measured spectra were analyzed mainly based on the database of National Institute of Standards and Technology. As a result, spectral lines of He Ⅱ, Li Ⅱ–Ⅲ, B Ⅳ–Ⅴ, C Ⅲ–Ⅵ, O Ⅲ–Ⅷ, Ne Ⅱ–Ⅹ,Si Ⅴ–Ⅻ, and Ar Ⅹ–XVI are identified in EAST plasmas of which the central electron temperature and chord-averaged electron density range in Te0=0.6–2.8 keV and ne=(0.5–6.0)×1019 m-3, respectively. The wavelengths and transitions of euv lines identified here are summarized and listed in a table for each impurity species as the database for euv spectroscopy using fusion plasmas.

关键词： line identification euv spectroscopy euv spectra impurity line emissions tokamak plasmas

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spectral Analysis in euv Range for Study of Core Impurity Behavior in HL-2A

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Plasma Science and Technology 2014年第2期16卷 89-92页

作者：周航宇崔正英森田繁傅炳忠後藤基志孙平冯北滨崔学武卢平杨青巍段旭如 Southwestern Institute of Physics National Institute for Fusion Science

Extreme ultraviolet （euv） spectroscopy has been developed for impurity diagnostics in HL-2A tokamak. The euv spectrometer consists of an entrance slit, a holographic varied-line- space （VLS） grating, a back-illuminated charge-coupled device （CCD） and a laser light source for optical alignment. spectral lines in wavelength region of 20-500 A observed from HL-2A plasmas were analyzed to study the impurity behavior. spectral and temporal resolutions used for the analysis were 0.19A at CV （2×33.73 ,h,） and 6 ms, respectively. It was found that carbon, oxygen and iron impurities were usually dominant in the HL-2A plasma. They almost disappeared when the siliconization was carried out. Although the euv spectra were entirely replaced by the silicon emissions just after the siliconization, the emissions were considerably decreased with accumulation of discharges. Aluminum and neon were externally introduced into the HL-2A plasma based on laser blow-off （LBO） and supersonic molecular beam injection （SMBI） techniques for a trial of the impurity transport study, respectively. The preliminary result is presented for time behavior of euv spectral lines.

关键词： euv spectroscopy euv spectra LBO SMBI

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Space-Resolved VUV and euv Spectrometers in HL-2A

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Plasma Science and Technology 2013年第2期15卷 110-114页

作者：崔正英周航宇 S.MORITA 傅炳忠孙平高亚东 M.GOTO 徐媛董春凤杨青巍 Southwestern Institute of Physics Chengdu 610041 China National Institute for Fusion Science Toki 509-5292 Gifu Japan

A normal incidence vacuum ultraviolet （VUV） and a grazing incidence extreme ultraviolet （euv） spectrometers have been developed for the edge and core impurity measure- ments in HL-2A tokamak. The VUV and the euv spectrometers cover wavelength ranges of 300-3200 A and 50-500A, respectively. A spatial resolution of 2 mm has been achieved for the VUV spectrometer when a space-resolved slit 50 #m in width is used. The space-resolved slit is placed between the entrance slit and the grating of the spectrometer. The spectral resolutions of 0.15/~ for the VUV spectrometer in the wavelength coverage of the concave 1200 grooves/mm grating and of 0.22A for the euv spectrometer at λ=200A with a flat-field laminar-type holo- graphic grating are obtained. The sensitivity of the VUV spectrometer was calibrated in situ with the plasma bremsstrahlung radiation. The experimental results from both spectrometers are presented, especially the line intensity radial profiles measured by the VUV spectrometer.

关键词： VUV spectra euv spectra spectrometer spatial resolution

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