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Spectral simulation of multivalent collisional-radiative model for W25+–W28+ from EBIT to tokamak plasmas

B L Li, F H Qu, Y M Xie, X Liu, X W Zhang, K Yao, Y Yang, B Wei, Y Zou, J Xiao2024年8月Plasma Physics and Controlled FusionIF 2.2出版社

Accurate and reliable atomic modeling of tungsten ions holds significance for both spectral data analysis and the investigation of tungsten behavior within fusion plasma. To examine the impact of various atomic processes on spectral lines, a collisional-radiative model (CRM) involving multiple charge states for tungsten ions was performed with level-to-level processes with configuration interaction, including spontaneous emission, electron collisional ionization, collisional (de)excitation, radiative recombination, charge exchange, resonant capture, and autoionization. The evolution of M1 spectral lines of W25+–W28+ in the 330–540 nm range was measured using the SH-HtscEBIT and was successfully replicated by the multivalent CRM. The photon emission coefficients (PECs) associated with these M1 transitions in fusion plasma have also been furnished, revealing their minimal sensitivity to the influence of recombination and ionization processes. The verification of these PECs' properties holds potential for the forthcoming density diagnosis of tungsten ions in Tokamak. Subsequently, the multivalent CRM was also conducted to explore the impact of dielectronic recombination on extreme ultraviolet spectra. While resonant capture does lead to an augmentation in the population of autoionizing levels, the contribution of dielectronic recombination to spectral lines for W26+ and W27+ within the 2–8 nm range remains relatively insignificant.

日本語訳

タングステンイオンの正確で信頼性の高い原子モデリングは、スペクトルデータ解析と核融合プラズマ中のタングステンの挙動の調査の両方にとって重要である。スペクトル線に対する様々な原子過程の影響を調べるために、自発放出、電子衝突電離、衝突(脱)励起、放射再結合、電荷交換、共鳴捕獲、および自動イオン化を含む、配置間相互作用を伴う準位間過程を考慮した、タングステンイオンの複数の電荷状態を含む衝突放射モデル(CRM)を実行した。330–540 nm 範囲における W25+–W28+ の M1 スペクトル線の時間発展を SH-HtscEBIT を用いて測定し、多価 CRM によって首尾よく再現した。核融合プラズマにおけるこれらの M1 遷移に関連する光子放出係数(PECs)も提供され、それらが再結合および電離過程の影響に対して最小限の感度しか示さないことが明らかになった。これらの PEC の特性の検証は、トカマクにおけるタングステンイオンの今後の密度診断に潜在的可能性を持つ。続いて、極端紫外スペクトルに対する誘電再結合の影響を調べるために、多価 CRM も実施した。共鳴捕獲は自動イオン化準位のポピュレーションの増大をもたらす一方で、2–8 nm 範囲内の W26+ および W27+ のスペクトル線に対する誘電再結合の寄与は比較的重要でないままである。

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