摘要
An impurity powder dropper was installed in the 21 st campaign of the Large Helical Device experiment(Oct.2019–Feb.2020)under a collaboration between the National Institute for Fusion Science and the Princeton Plasma Physics Laboratory for the purposes of real-time wall conditioning and edge plasma control.In order to assess the effective injection of the impurity powders,spectroscopic diagnostics were applied to observe line emission from the injected impurity.Thus,extreme-ultraviolet(EUV)and vacuum-ultraviolet(VUV)emission spectra were analyzed to summarize observable impurity lines with B and BN powder injection.Emission lines released from B and N ions were identified in the EUV wavelength range of 5–300Ameasured using two grazing incidence flat-field EUV spectrometers and in the VUV wavelength range of 300–2400Ameasured using three normal incidence 20 cm VUV spectrometers.BI–BV and NIII–NVII emission lines were identified in the discharges with the B and BN powder injection,respectively.Useful B and N emission lines which have large intensities and are isolated from other lines were successfully identified as follows:BI(1825.89,1826.40)A(blended),BII 1362.46A,BIII(677.00,677.14,677.16)A(blended),BIV 60.31A,BV 48.59A,NIII(989.79,991.51,991.58)A(blended),NIV765.15A,NV(209.27,209.31)A(blended),NVI 1896.80A,and NVII 24.78A.Applications of the line identifications to the advanced spectroscopic diagnostics were demonstrated,such as the vertical profile measurements for the BV and NVII lines using a space-resolved EUV spectrometer and the ion temperature measurement for the BII line using a normal incidence 3 m VUV spectrometer.
作者
大石鉄太郎
芦川直子
Federico NESPOLI
増崎貴
庄司主
Eric P GILSON
Robert LUNSFORD
森田繁
後藤基志
川本靖子
鈴木千尋
孙震
Alex NAGY
David A GATES
森崎友宏
Tetsutarou OISHI;Naoko ASHIKAWA;Federico NESPOLI;Suguru MASUZAKI;Mamoru SHOJI;Eric P GILSON;Robert LUNSFORD;Shigeru MORITA;Motoshi GOTO;Yasuko KAWAMOTO;Chihiro SUZUKI;Zhen SUN;Alex NAGY;David A GATES;Tomohiro MORISAKI(Department of Fusion Science,The Graduate University for Advanced Studies,SOKENDAI,322-6 Oroshi-cho,Toki 509-5292,Gifu,Japan;Princeton Plasma Physics Laboratory,100 Stellarator Road,Princeton,NJ 08540,United States of America;National Institute for Fusion Science,National Institutes of Natural Sciences,322-6 Oroshi-cho,Toki 509-5292,Gifu,Japan)
基金
supported by the Post-CUP program
JSPSCAS Bilateral Joint Research Projects,‘Control of wall recycling on metallic plasma facing materials in fusionreactor,’2019–2022,(No.GJHZ201984)
US Department of Energy(No.DE-AC02-09CH11466)with Princeton University
the LHD project financial support(Nos.ULPP010,ULFF022)
JSPS KAKENHI(Nos.17K14426,20K03896)。