等离子体焦点装置中子发射的研究

Study on the neutron emission in plasma focus

研究了 ＤＰＦ－４０ Ｍａｔｈｅｒ型等离子体焦点装置不同电极结构对于中子发射的影响。通过改变电极结构，使装置产生的 ２．４５ ＭｅＶ氖－氖反应（Ｄ－Ｄ）脉冲快中子产额由每次放电 １０８提高到 １０９。该值已接近中子产额定标定律的预期值。中子脉宽约为 ４０～６０ ｎｓ。此外发现，当装置长期连续运行时，绝缘子表面状态的进一步变化对等离子体聚焦运动和中子发射具有不利影响。

Studies on the influence of electrode structure on neutron emission in the DPF--40 Mather type plasma focus device have been carried out. By improving the electrode structure, the impulse 2. 45 MeV D-D fast neutron yield has been increased from 108 per shot to 109 per shot,which is close to the value predicted by the scaling law. It is found that further changes in the status of the insulator surface may have negative effects on the plasma focus and neutron yield when the device is to be operated for a long period.