Influence of electrodes' geometrical properties on the neutron production rate of a discharge fusion neutron source
Influence of electrodes' geometrical properties on the neutron production rate of a discharge fusion neutron source
复制标题
DOI：
10.1063/5.0134631
复制
发表时间：
2023-03-01
影响因子：
2.2
通讯作者：
Konishi, S.
中科院分区：
文献类型：
--
作者：
Bakr, M.;Sakabe, T.;Konishi, S.
在势阱内捕获离子（例如氘和氚）以产生中子是分别经由惯性静电约束聚变（IECF）和托卡马克通过电场和磁场的成熟技术。在IECF中，简单的配置是一个连接到负偏压的同心阴极，周围是一个接地的阳极，作为真空容器。理论上，通过施加几十kV电压和几十mA电流加速的离子之间的聚变，在容器内产生中子。许多参数影响系统中的等离子体条件和聚变，因此影响中子产生率（NPR）。本文研究了阴极透明度和孔径数对NPR的影响。为此，11个阴极由不锈钢制成，分成三个不同的组，具有不同的透明度和孔数。研究了NPR作为阴极透明度和孔数的函数，在类似于1 kW的低功率操作模式下。实验结果表明，高的NPR产生较低的网格透明度，反之亦然，这一行为是通过光束表面与网格表面融合解释。此外，更高的NPR从具有许多孔的栅极产生;这归因于通过栅极通道的电离电子的数量的氘电离改善的效果。
Trapping ions, such as deuterium and tritium, inside a potential well to generate neutrons is a well-established technology through electric and magnetic fields via the inertial electrostatic confinement fusion (IECF) and the tokamak, respectively. In the IECF, the straightforward configuration is a concentric cathode connected to a negative bias, surrounded by a grounded anode that serves as a vacuum vessel. Theoretically, neutrons are generated inside the vessel through fusion between ions that are accelerated by applying several tens kV voltage and tens mA current. Many parameters affect the plasma conditions and fusion in the system, hence the neutron production rate (NPR). This study investigates the cathode transparency and the number of apertures effect on NPR. For this end, eleven cathodes were fabricated from stainless steel in three different groups with different transparency and number of apertures. NPRs were investigated as a function of the cathode transparency and number of apertures at low power operating mode similar to 1 kW. Experimental results revealed that higher NPR was produced from lower grid transparency and vice versa; this behavior was explained through beam-surface fusion with grid surface. In addition, a higher NPR was generated from the grid with many apertures; this was attributed to the effect of the deuterium ionization improvement by the number of ionizing electrons through the grid channels.