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Carbon and oxygen behaviour in the reversed field pinch RFX

L. Carraro, M.E. Puiatti, F. Sattin, P. Scarin, M. Valisa, M. Mattioli1996年被引用 25Nuclear FusionIF 3出版社

The emission spectrum measured on the reversed field pinch RFX is dominated by carbon and oxygen lines. Nickel lines are seldom observed even though a large magnetic field perturbation causes intense plasma-wall interaction. The line emissions from hydrogen-like and helium-like ions observed in RFX are simulated by a collisional-radiative impurity diffusion model. An impurity diffusion coefficient of the order of 10 m2/s and an inward convective velocity of 90 m/s have been used for an adequate simulation of the hydrogen-like to helium-like resonant line ratios. The model can be used to estimate the effective charge of the plasma; the on-axis values in 800 kA discharges are found to range between 1.5 and 2.2, with peaks higher than 3 in the presence of carbon blooms. It is found that charge exchange processes with thermal hydrogen neutral atoms must be considered to account for the high G ratio values measured for carbon (0.6 to 0.7)

日本語訳

逆転磁場ピンチRFXで測定された発光スペクトルは、炭素と酸素の輝線によって支配されている。大きな磁場摂動が激しいプラズマ-壁相互作用を引き起こすにもかかわらず、ニッケル輝線はめったに観測されない。RFXで観測された水素様およびヘリウム様イオンからの輝線放射は、衝突-放射不純物拡散モデルによってシミュレーションされる。水素様からヘリウム様への共鳴輝線比の適切なシミュレーションのために、10 m2/s のオーダーの不純物拡散係数と 90 m/s の内向き対流速度が用いられている。このモデルはプラズマの実効電荷を推定するために使用できる。800 kA 放電における軸上の値は 1.5 から 2.2 の範囲にあることが見出され、カーボンブルームの存在下では 3 より高いピークを示す。炭素について測定された高いG比の値(0.6 から 0.7)を説明するためには、熱的な水素中性原子との電荷交換過程を考慮しなければならないことが見出された。

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