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Neutron pinhole camera investigations on temporal and spatial structures of plasma focus neutron source

K. Steinmetz, K. Hübner, J.P. Rager, B.V. Robouch1982年被引用 18Nuclear FusionIF 3出版社

The neutron emission of the Frascati 1-MJ-plasma focus has been investigated over an energy range of 250 to 500 kJ by means of a neutron pinhole camera, using a six-channel detector array. Single-shot neutron streak images, space- and time-resolved, are obtained with an axial resolution of 2 cm and a time resolution of about 5 ns. – Results show that over 70% of the neutrons (i.e. more than 1011 neutrons per shot at 490 kJ) are emitted from a co-axial cylindrical volume about 4 cm long and less than 4 cm in diameter at the anode tip. Neither axial nor radial motion of this main source is observed throughout the emission lasting 200 ns FWHM typically. Simultaneous independent measurements show, for this zone, an isotropic neutron fluence (A = Φ (axial)/Φ (equat.) = 0.97 ± 0.04), while the energy spectra still are anisotropic as reported previously.

日本語訳

フラスカティ1MJプラズマフォーカスの中性子放出を、6チャンネル検出器アレイを用いた中性子ピンホールカメラにより、250〜500kJのエネルギー範囲で調査した。単発中性子ストリーク画像は、空間分解能2cm、時間分解能約5nsで取得された。結果は、490kJにおいて1ショットあたり10¹¹個以上の中性子の70%以上が、陽極先端部の直径4cm未満、長さ約4cmの同軸円筒体積から放出されることを示している。この主たる放出源の軸方向および径方向の移動は、典型的には200ns(FWHM)の放出持続時間を通じて観測されなかった。同時独立測定により、この領域では等方的な中性子フルエンス(A = Φ(軸方向)/Φ(赤道方向)= 0.97 ± 0.04)が示された一方、エネルギー・スペクトルは、既報の通り、依然として異方性を示している。

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