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Neutron emission characterisation at the FN-II Dense Plasma Focus

机译：FN-II致密等离子体焦点的中子排放表征

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Plasma foci are efficient plasma based neutron sources, when deuterium is used as the filling gas. The dense plasma focus FN-II is a small device (4.7 kJ), in which the emission of deuterium fusion neutrons (2.45 MeV) are studied. The system produces an average neutron yield of (5.3 ± 0.5) x 10~8 neutron/shot in 4π sr at ~ 350 kA peak discharge current and 2.75 torr deuterium operation. Three methods are currently used; silver activation counters and CR- 39 nuclear track detectors, for time integrated and angular distribution studies, and BC 400 scintillators coupled to photomultiplier tubes for spectra studies. In the latter case, we compare signals due to neutron reflections in the laboratory with those obtained with a collimated beam in a paraffin shielded detector. Regarding the angular distribution of the neutron emission, it has been found to have isotropic and anisotropic components, the former giving the largest contribution. Also, the neutron spectrum, measured at 90o of the axis device, is broadened, peaking at energies slightly larger than 2.45 MeV. These can be interpreted as the consequence of coexisting neutron generation mechanisms, which will be discussed in this work. The correlation between neutron and hard X-ray yields is also discussed, and a possible interpretation in terms of different neutron generation mechanisms is attempted. There has also been a dosimetric study of the laboratory with TLD dosimeters, which will be presented in this paper.
机译：当氘用作填充气体时，等离子体焦点是高效的基于等离子体基中子源。致密等离子体聚焦FN-II是一种小型装置（4.7kJ），其中研究了氘融合中子（2.45meV）的排放。该系统产生（5.3±0.5）×10〜8中子的平均中子产率，在〜350ka峰值放电电流和2.75托氘操作中4πsr中的4〜8中子/射击。目前使用三种方法;银激活计数器和CR-39核轨道探测器，用于时间集成和角度分布研究，以及BC 400闪烁体，耦合到光电倍增管，用于光谱研究。在后一种情况下，我们将由于实验室中的中子反射而与在石蜡屏蔽检测器中的准直梁中获得的那些进行比较信号。关于中子排放的角度分布，已发现具有各向同性和各向异性组分，前者给出了最大的贡献。而且，在轴装置90o处测量的中子谱宽，能量达到略大于2.45meV。这些可以解释为共存中子生成机制的后果，这将在这项工作中讨论。还讨论了中子和硬X射线产量之间的相关性，并尝试了不同中子生成机制方面的可能解释。对TLD剂量计的实验室还有一种剂量测定，这将在本文中提出。

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