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Dependence of neutron yield on the deuterium filling pressure in a plasma focus device

Hyun-Jong Woo, Kyu-Sun Chung, Myoung-Jae Lee2004年Plasma Physics and Controlled FusionIF 2.2出版社

A Mather-type plasma focus device (32 µF, 4 kJ), called Hanyang University Plasma Focus device, is developed as a prototype device for the irradiation test of neutrons for electric probes and cables to be used in Korea Superconducting Tokamak Advanced Research with pure deuterium gas. The six different lengths of electrode are used in order to see the dependence of neutron yield on the deuterium filling pressure at given system conditions such as capacitance, currents and inductance, after optimizing the focusing condition in terms of electrode length versus filling pressure. The relationship between the pressure and electrode length is to be fitted well by the snow-plow model. The neutron fluence and angular distribution are measured at the angles of 0°, 25°, 60° and 90° by locating the bubble neutron dosimeter at a distance 30 cm from the inner electrode head at each electrode length. The anisotropic factor tends to increase with pressure and the total neutron yield is strongly dependent on the isotropic emission. The maximum neutron yield is estimated to be about 1.6 × 108 (n/shot) at a pressure of 3.4 Torr.

日本語訳

マザー型プラズマフォーカス装置(32 µF、4 kJ)は、韓国超伝導トカマク先進研究で使用される中性子プローブおよびケーブル用の照射試験のためのプロトタイプ装置として、純重水素ガスを用いて開発された。電極長は6種類に変更され、静電容量、電流などの所与のシステム条件下での重水素充填圧力に対する中性子収量の依存性を調べるため、電極長と充填圧力の観点からフォーカシング条件を最適化した後に実験が行われた。圧力と電極長の関係はスノープローモデルによって良好に適合された。中性子フルエンスと角度分布は、各電極長において、電極先端から30 cmの距離にバブル中性子線量計を配置し、0°、25°、60°、90°の角度で測定された。異方性係数は圧力とともに増加する傾向を示し、全中性子収量は等方性放出に強く依存することが確認された。最大中性子収量は、圧力3.4 Torrにおいて約1.6 × 10⁸(n/ショット)と推定された。

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DeuteriumPlasma focusNeutron yield
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