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Spectra of O II in the plasma boundary of TEXTOR-94

D Borodin, I L Beigman, L A Vainshtein, A Pospieszczyk, S Brezinsek, A Huber2002年Plasma Physics and Controlled FusionIF 2.2出版社

Spectra of the O II ion were obtained with temporal and spatial (along the poloidal radius) resolution by injecting of oxygen-containing molecules through a block of the upper poloidal limiter of TEXTOR-94 into the boundary plasma. Three different wavelength regions (4660±100, 4340±100, 3730±100 Å) were observed during reproducible TEXTOR-94 discharges with ne = 1×1018 m−3, Te = 90 eV at the last closed flux surface (LCFS). For calibration purposes the oxygen emission was simultaneously registered in all discharges with a 2D camera using the light from an O II line at 4416 Å. Radial intensity distributions of lines corresponding to the transitions 2p2[3P]3s–2p2[3P]3p (components of the multiplets 4P–4S, 4P–4P, 4P–4D, 2P–2D) and 2p2[1D]3s–2p2[1D]3p (doublet 2D–2D) were measured. It is shown that the relative intensities of the lines inside the multiplets are in good agreement with theoretical data calculated in SL-coupling. An appropriate collisional-radiative model (the level list and the corresponding atomic database) has been developed and calculations have been carried out using the GKU kinetic code developed at the P.N. Lebedev Institute. Cross-sections of atomic processes have been calculated using the ATOM code by the K-matrix method. A comparison of theoretical and experimental data is presented. It is shown that the relative multiplet intensities have a weak dependence on electron density and temperature. The populations of the ground configuration states of O II were investigated. Absolute values for the `ionization per photon' were measured and a comparison with modelled values is given.

日本語訳

O IIイオンのスペクトルは、TEXTOR-94の上部ポロイダルリミターのブロックを通して酸素含有分子を注入することにより、時間分解および(ポロイダル半径方向に沿った)空間分解で取得された。再現性のあるTEXTOR-94放電中に、3つの異なる波長領域(4660±100、4340±100、3730±100 Å)が観測された。このとき、最終閉塞磁気面(LCFS)における電子密度はne = 1×1018 m−3、電子温度はTe = 90 eVであった。較正の目的で、全放電において2Dカメラを用いて4416 ÅのO II線からの光により酸素発光を同時に記録した。遷移2p2[3P]3s–2p2[3P]3p(多重項4P–4S、4P–4P、4P–4D、2P–2Dの成分)および2p2[1D]3s–2p2[1D]3p(二重項2D–2D)に対応する線の動径方向強度分布が測定された。多重項内の線の相対強度は、SL結合で計算された理論データと良好に一致することが示された。適切な衝突-放射モデル(準位リストおよび対応する原子データベース)が構築され、P.N.レベデフ研究所で開発されたGKU運動論コードを用いて計算が実施された。原子過程の断面積は、K行列法によるATOMコードを用いて計算された。理論データと実験データの比較が示されている。多重項の相対強度は、電子密度および温度に弱い依存性しか持たないことが示された。O IIの基底配置状態の分布数が調査された。「光子当たりの電離」の絶対値が測定され、モデル計算値との比較が示されている。

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