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Numerical experiments on neutron yield and soft x-ray study of a ∼100 kJ plasma focus using the current profile fitting technique

S T Ong, K Chaudhary, J Ali, S Lee2014年Plasma Physics and Controlled FusionIF 2.2出版社

Numerical experiments using the Lee model were performed to study the neutron yield and soft x-ray emission from the IR-MPF-100 plasma focus using the current fitting technique. The mass sweeping factor and the current factor for the axial and radial phase were used to represent the imperfections encountered in experiments. All gross properties including the yields were realistically simulated once the computed and measured current profiles were well fitted. The computed neutron yield Yn was in agreement with the experimentally measured Yn at 20 kV (E0 ∼ 30 kJ) charging voltage. The optimum computed neutron yield of Yn = 1.238 × 109 neutrons per shot was obtained at optimum physics parameters of the plasma focus operated with deuterium gas. It was also observed that no soft x-rays were emitted from the IR-MPF-100 plasma focus operated with argon gas due to the absence of helium-like and hydrogen-like ions at a low plasma temperature (∼0.094 keV) and axial speed (8.12 cm µs−1). However, the soft x-ray yield can be achieved by increasing the charging voltage, using a higher ratio of outer anode radius to inner anode radius c or shorter anode length z0, or using neon as the operating gas.

日本語訳

数値実験をリー模型を用いて行い、電流フィッティング手法を用いてIR-MPF-100プラズマフォーカスからの中性子収量と軟X線放出を研究した。軸方向および径方向の位相における質量掃引係数と電流係数を用いて、実験における不完全性を表現した。計算された電流プロファイルと測定された電流プロファイルが良好に適合すると、収量を含むすべての巨視的性質が現実的にシミュレーションされた。計算された中性子収量Ynは、20 kV(E0 ≈ 30 kJ)の充電電圧における実験的に測定されたYnと一致した。重水素ガスで動作するプラズマフォーカスの最適物理パラメータにおいて、最適な計算中性子収量Yn = 1.238 × 10^9 中性子/回が得られた。また、アルゴンガスで動作するIR-MPF-100からは、低いプラズマ温度(≈ 0.094 keV)と軸方向速度(8.12 cm/μs)におけるヘリウム様イオンおよび水素様イオンの欠如により、軟X線が放出されないことが観察された。しかしながら、充電電圧を増加させ、内陽極半径に対する外陽極半径の比cまたは陽極長z0をより高く設定するか、あるいは動作ガスとしてネオンを使用することにより、軟X線収量を達成することができる。

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Plasma focusSoft x-rayCurrent profileNeutron yield
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