Correlation between Negative Hydrogen Ion Production and Work Function of Plasma Grid Surface in a Cesium-Introduced Volume-Production-Type Negative Hydrogen Ion Source
Correlation between Negative Hydrogen Ion Production and Work Function of Plasma Grid Surface in a Cesium-Introduced Volume-Production-Type Negative Hydrogen Ion Source
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引入铯量产型负氢离子源中负氢离子产量与等离子体栅极表面功函数的相关性
DOI：
10.1143/jjap.35.1894
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发表时间：
1996
影响因子：
1.5
通讯作者：
Akihito Nagase Akihito Nagase
中科院分区：
文献类型：
--
作者：
Katsuhiro Shinto Okumura;Toshimitsu Ando Toshimitsu Ando;Motoi Wada Motoi Wada;Hiroshi Tsuda Hiroshi Tsuda;Takashi Inoue Takashi Inoue;Kenji Miyamoto Kenji Miyamoto;Akihito Nagase Akihito Nagase
实验研究了铯离子体产生型负氢离子（H-）源中等离子体栅面功函数与引出H-电流的关系。在高真空实验室中测量了Cs/Mo表面的量子效率与光子能量的关系，得到了Ar ~+激光波长下的量子效率与光电功函数的关系。利用这种关系，等离子体栅极表面的功函数已被确定通过测量量子效率使用Ar+激光。当H-电流的增量相对于测量的功函数作图时，观察到对功函数的减小的指数依赖性。实验结果不能用H-形成的理论模型来解释，当假设H-是由H原子离开表面产生的，其能量对应于等离子体中H原子的温度。当H ~-产生的动能远大于热能时，理论结果与实验结果符合得很好。
The correlation between the work function of a plasma grid surface in a Cs-introduced volume-production-type negative hydrogen ion ( H-) source and the extracted H- current has been investigated experimentally. The quantum efficiency of a Cs/Mo surface has been measured as a function of the photon energy in a high-vacuum test chamber, and a relationship between the photoelectric work function and the quantum efficiencies at the wavelengths of an Ar+ laser has been obtained. Using this relationship, the work function of the plasma grid surface has been determined by measuring quantum efficiency using an Ar+ laser. When the increment of the H- current is plotted against the measured work function, an exponential dependence on the decrease of the work function is observed. The experimental result cannot be explained by a theoretical H- formation model when one assumes that H- are produced from H atoms leaving from the surface with the energy corresponding to the temperature of H atoms in the plasma. When H- are produced with the kinetic energy substantially larger than thermal energy, the theoretical result shows good agreement with the experimental result.