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Current and neutron scaling for megajoule plasma focus machines

S Lee2008年Plasma Physics and Controlled FusionIF 2.2出版社

In a 2007 paper Nukulin and Polukhin surmised from electrodynamical considerations that, for megajoule dense plasma focus devices, focus currents and neutron yield Yn saturate as the capacitor energy E0 is increased by increasing the capacitance C0. In contrast, our numerical experiments show no saturation; both pinch currents and Yn continue to rise with C0 although at a slower rate than at lower energies. The difference in results is explained. The Nukulin and Polukhin assumption that the tube inductance and length are proportional to C0 is contrary to laboratory as well as numerical experiments. Conditions to achieve Yn of 1013 in a deuterium plasma focus are found from our numerical experiments, at a storage energy of 3 MJ with a circuit peak current of 7.6 MA and focus pinch current of 2.5 MA.

日本語訳

2007年の論文で、NukulinとPolukhinは電磁力学的考察から、メガジュール級の高密度プラズマフォーカス装置において、コンデンサエネルギーE0を静電容量C0の増加によって増大させると、フォーカス電流と中性子収量Ynは飽和すると推測した。対照的に、我々の数値実験では飽和は示されず、両者(ピンチ電流とYn)はC0とともに増加し続けるが、その増加率は低エネルギー時よりも緩やかである。この結果の差異を説明する。NukulinとPolukhinの仮定、すなわちチューブインダクタンスと長さがC0に比例するという仮定は、実験室実験および数値実験の両方に反する。我々の数値実験から、重水素プラズマフォーカスにおいて、蓄積エネルギー3 MJ、回路ピーク電流7.6 MA、フォーカスピンチ電流2.5 MAの条件で、Yn=10¹³を達成するための条件が明らかになった。

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