INVESTIGATION OF INFLUENCE OF SURFACE NANOPARTICLE ON EMISSION PROPERTIES OF SCANDIA-DOPED DISPENSER CATHODES

被引：6

作者：

Zhang, Xizhu ^{[1
]}

Wang, Jinshu ^{[1
]}

Wang, Yiman ^{[1
]}

Liu, Wei ^{[1
]}

Zhou, Meiling ^{[1
]}

Gao, Zhiyuan ^{[2
]}

机构：

[1] Beijing Univ Technol, Sch Mat Sci & Engn, Beijing 100124, Peoples R China

[2] Beijing Univ Technol, Coll Elect Informat & Control Engn, Beijing 100124, Peoples R China

来源：

FUNCTIONAL MATERIALS LETTERS | 2013年 / 6卷 / 04期

基金：

中国国家自然科学基金; 北京市自然科学基金;

关键词：

Scandate cathode; nanoparticles; local electric field; HIGH-CURRENT-DENSITY;

D O I：

10.1142/S1793604713500409

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructure of a fully activated scandia doped dispenser (SDD) cathode has been studied by scanning electron microscope (SEM). The observation results display that nanoparticles appear at the growth steps and the surface of tungsten grains of the fully activated SDD cathode. To study the influence of the nanoparticles on the emission, the local electric field strengths around the nanoparticles have been calculated by Maxwell 2D code and Comsol. The calculation results show that the local electric field strengths are enhanced by 1.1 to 3.8 times to average value based on different model conditions. The highest field strength is about 1.54 x 10(5) V/cm at an average field strength of 40 KV/cm, which is related to a space-charge limited (SCL) current density of 100 A/cm(2) in the experimental configuration. This implies the field strength is not high enough to cause field emission.

引用

页数：5

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