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Near-infrared Zeeman spectroscopy for the spatially resolved measurement of helium emission spectra in Heliotron J

Taiichi Shikama, Shinichiro Kado, Hiroyuki Okada, Satoshi Yamamoto, Leo Matsuoka, Toru Mizuuchi, Takashi Minami, Shinji Kobayashi, Kazunobu Nagasaki, Shinsuke Oshima2019年Plasma Physics and Controlled FusionIF 2.2出版社

A passive spectroscopic method that can measure spatially resolved emission spectra only by observing from a single diagnostic port without assuming plasma symmetry was applied to the stellarator-heliotron device Heliotron J. The emission spectra from the inboard and outboard sides were separated using the difference in their Zeeman effects. On the basis of the fact that in a spectrum as a function of the wavelength, the magnitude of the wavelength splitting by the Zeeman effect relative to the Doppler broadening increases with the wavelength, the method was applied to a near-infrared helium emission line (He I 1s2s 3S−1s2p 3P, 1083 nm), and it was confirmed that the uncertainty in the separated spectra was reduced compared with that in the application to visible emission lines. From the emissivity of the separated spectra, the local recycling flux was evaluated using the inverse photon efficiency method.

日本語訳

恒星ヘリオトロン装置Heliotron Jにおいて、プラズマの対称性を仮定することなく、単一の診断ポートからの観測のみで空間分解された発光スペクトルを測定できる受動的分光法を適用した。内側および外側からの発光スペクトルは、それらのゼーマン効果の差異を用いて分離された。波長の関数としてのスペクトルにおいて、ゼーマン効果による波長分裂の大きさがドップラー広がりに対して増大するという事実に基づき、この手法を近赤外ヘリウム発光線(He I 1s2s 3S−1s2p 3P、1083 nm)に適用し、可視発光線への適用と比較して、分離されたスペクトルにおける不確かさが低減されることを確認した。分離されたスペクトルからの発光率を用いて、逆光子効率法により局所的なリサイクリングフラックスを評価した。

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