Search for thermonuclear neutrons in a mega-ampere plasma focus
Search for thermonuclear neutrons in a mega-ampere plasma focus
复制标题
在兆安等离子体焦点中寻找热核中子
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
E. Zielińska
中科院分区：
文献类型：
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作者：
D. Klír;P. Kubes;M. Paduch;T. Pisarczyk;T. Chodukowski;M. Scholz;Z. Kalinowska;B. Bieńkowska;L. Karpiński;J. Kortanek;J. Kravarik;K. Rezac;I. Ivanova;K. Tomaszewski;E. Zielińska
在改进的PF-1000上进行了等离子体聚焦实验，其中在阳极前面添加了阴极盘。实验结果表明，在兆安培电流水平上有一小部分热核中子。为了验证热核机制，用飞行时间诊断法测量了中子产生时间和中子能谱。中子飞行时间信号表明，中子产生是一个多相过程，多个机制同时发生。热核机制的发生在低氘压下的等离子体停滞期间最为明显。在低填充压力下，中子能谱的窄宽度表明离子温度约为1 keV。在停滞之后，在主中子发射期间，也研究了热核中子的可能性。在这种情况下，热核机制可以通过计算参与聚变过程的氘的数量来验证。对于热核等离子体的主体，等离子体的重要部分应该参与聚变。最后，对Z箍缩中热核机制的基本考虑表明了MagLIF概念的合理性。
Plasma focus experiments were carried out at a modified PF-1000 where the cathode disc was added in front of the anode. Experimental results indicated a fraction of thermonuclear neutrons on the mega-ampere current level. In order to prove the thermonuclear mechanism, the time of neutron production and the neutron energy spectrum were measured by time-of-flight (TOF) diagnostics. Neutron TOF signals showed that the neutron production was a multiphase process and more than one mechanism occurred simultaneously. The occurrence of the thermonuclear mechanism was most evident during the plasma stagnation at low deuterium pressures. At low filling pressures, the narrow width of the neutron energy spectra demonstrated an ion temperature of about 1 keV. The possibility of thermonuclear neutrons was studied also after the stagnation, during the main neutron emission. In this case, the thermonuclear mechanism could be verified by calculating the number of deuterons that participate in the fusion process. For the bulk of thermonuclear plasmas, a significant fraction of plasma should participate in fusion. Finally, the basic consideration of the thermonuclear mechanism in Z-pinches showed the reasonableness of the MagLIF concept.