Effects of Metal Hydride Coatings at the Electrodes on Neutron Production Rate in a Discharge-Type Fusion Neutron Source
Effects of Metal Hydride Coatings at the Electrodes on Neutron Production Rate in a Discharge-Type Fusion Neutron Source
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电极金属氢化物涂层对放电型聚变中子源中子产率的影响
DOI：
10.1109/tps.2022.3182723
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发表时间：
2022
影响因子：
1.5
通讯作者：
Konishi S.
中科院分区：
文献类型：
--
作者：
Sakabe T.;Kenjo S.;Ogino Y.;Mukai K.;Bakr M.;Yagi J.;Konishi S.
利用氘核聚变反应的辉光放电（GD）聚变中子源已得到升级。该装置中的聚变反应主要是通过带电或中性粒子与电极表面捕获的氢同位素之间的碰撞而发生的。此外，众所周知，电极上的金属氢化物涂层可以提高中子产生速率（NPR）。因此，包括氘在内的元素在电极深度方向的分布是中子产生的重要因素。然而，电极上的分布尚未经过实验研究。本研究旨在通过实验分析分布并表明金属氢化物涂层的效果。为了实现这一目的，我们制备了钛（Ti）涂层阴极和无涂层阴极，其基材为不锈钢。之后，在电流5～40mA、施加电压20～60kV的范围内进行中子产生试验。该测试表明，与未涂覆的阴极相比，通过涂覆Ti的阴极提高了NPR。此外，还通过辉光放电发射光谱（GD-OES）对阴极进行了深度分析。虽然分析表明测试后两个阴极上的氘浓度均有所增加，但两个阴极之间的氘浓度没有显着差异。此外，Ti涂层阴极上Ti的浓度大大降低。需要调查这些变化的原因。
A glow discharge (GD) fusion neutron source that utilizes nuclear fusion reactions of deuterium has been upgraded. The fusion reactions in this device mainly occur by collisions between the charged or neutral particles and the hydrogen isotopes trapped at the surface of electrodes. In addition, it is known that the metal hydride coating on the electrode enhances the neutron production rate (NPR). Therefore, the elemental distribution, including deuterium, in the depth direction on the electrode is an essential factor in neutron production. However, the distribution on the electrode has not been experimentally investigated. This study aims to analyze the distribution experimentally and indicate the effect of the metal hydride coatings. To achieve this purpose, we prepared the titanium (Ti)-coated cathode and the uncoated cathode, of which the base material was stainless steel. After that, the neutron production test was performed in the range of from 5- to 40-mA currents and from 20- to 60-kV applied voltage. This test indicated that the NPR was improved by coating the cathode with Ti than the uncoated cathode. In addition, depth profiling on the cathodes by glow discharge optical emission spectroscopy (GD-OES) was performed. While the analysis indicated that the concentration of deuterium on both cathodes was increased after the test, there was no significant difference in the concentration of deuterium between both cathodes. Furthermore, the concentration of Ti on the Ti-coated cathode was vastly decreased. The cause of these changes needs to be investigated.
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