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Extreme ultraviolet spectroscopy and atomic models of highly charged heavy ions in the Large Helical Device

C Suzuki, I Murakami, F Koike, N Tamura, H A Sakaue, S Morita, M Goto, D Kato, H Ohashi, T Higashiguchi2017年Plasma Physics and Controlled FusionIF 2.2出版社

We report recent results of extreme ultraviolet (EUV) spectroscopy of highly charged heavy ions in plasmas produced in the Large Helical Device (LHD). The LHD is an ideal source of experimental databases of EUV spectra because of high brightness and low opacity, combined with the availability of pellet injection systems and reliable diagnostic tools. The measured heavy elements include tungsten, tin, lanthanides and bismuth, which are motivated by ITER as well as a variety of plasma applications such as EUV lithography and biological microscopy. The observed spectral features drastically change between quasicontinuum and discrete depending on the plasma temperature, which leads to some new experimental identifications of spectral lines. We have developed collisional-radiative models for some of these ions based on the measurements. The atomic number dependence of the spectral feature is also discussed.

日本語訳

我々は、大型ヘリカル装置(LHD)で生成されたプラズマ中の高電荷重イオンの極端紫外(EUV)分光に関する最近の結果を報告する。LHDは、高輝度と低不透明度、ならびにペレット入射システムと信頼性の高い診断ツールの利用可能性を兼ね備えているため、EUVスペクトルの実験データベースの理想的な供給源である。測定された重元素には、タングステン、スズ、ランタノイド、ビスマスが含まれ、これらはITERならびにEUVリソグラフィーや生物顕微鏡などのさまざまなプラズマ応用によって動機づけられている。観測されたスペクトル特徴は、プラズマ温度に応じて準連続体と離散スペクトルの間で劇的に変化し、これによりいくつかの新しいスペクトル線の実験的同定がもたらされた。我々は、これらのイオンのいくつかについて、測定に基づいた衝突放射モデルを開発した。スペクトル特徴の原子番号依存性についても議論する。

装置

lhd高精度(タイトル一致)iter中精度(概要文一致)

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Helical device
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