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Enhanced and reproducible neutron emission from a plasma focus with pre-ionization induced by depleted uranium (U238)

S Ahmad, S S Hussain, Mehboob Sadiq, M Shafiq, A Waheed, M Zakaullah2006年Plasma Physics and Controlled FusionIF 2.2出版社

The effect of pre-ionization induced by depleted uranium (92U238) around the insulator sleeve on the neutron emission of (1.8–3.3 kJ) plasma focus device is investigated by employing time resolved and time integrated neutron detectors. The maximum average neutron yield of 2.5 × 108 is recorded at 3.5 mbar without pre-ionization, which increases up to 3.85 × 108 with pre-ionization. It is found that the pre-ionization enhances neutron yield, about (50 ± 5)%, broadens the neutron emission pressure range and improves shot-to-shot reproducibility of plasma focus operation for neutron emission. The pinhole images of charged particles emitting zones indicate that the pre-ionization increases the high temperature plasma volume.

日本語訳

劣化ウラン(92U238)による絶縁スリーブ周辺の予備電離が、(1.8–3.3 kJ)プラズマフォーカス装置の中性子放出に及ぼす影響を、時間分解および時間積分型中性子検出器を用いて調査した。予備電離なしの場合、最大平均中性子収量は3.5 mbarで2.5 × 10⁸記録されたが、予備電離ありの場合には3.85 × 10⁸まで増加した。予備電離は中性子収量を約(50 ± 5)%増強し、中性子放出の圧力範囲を広げ、プラズマフォーカス動作における中性子放出のショット間再現性を改善することが見出された。荷電粒子放出領域のピンホール画像は、予備電離が高温プラズマ体積を増加させることを示している。

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