Open AccessStudy of pulsed field emission characteristics and simulation models of carbon nanotube cold cathodes
Author(s) -
Xuesong Yuan,
Yu Zhang,
Ling Sun,
Xiaoyun Li,
Shaozhi Deng,
Ning Xu,
Yan Yang
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.216101
Subject(s) - field electron emission , cathode , carbon nanotube , anode , microwave , materials science , optoelectronics , electric field , electron gun , electron , current (fluid) , atomic physics , physics , nanotechnology , electrode , electrical engineering , cathode ray , engineering , quantum mechanics , thermodynamics
For the application requirement of a carbon nanotube clod cathode (CNCC) used in the microwave and millimeter wave electric vacuum radiation source devices, pulsed field emission characteristics of CNCC are experimentally investigated by a 2 μs/20 kV high-voltage modulator in this paper. The pulsed field emission currents for different distances between anode and cathode and those of CNCC after the pulsed high-tension arc has occurred many times are studied. A maximal emission current of 16 mA is tested for CNCC with a 4 mm diameter emission disk, and the emission current density is achieved to be 127 mA/cm2. Based on the experimental results, the field emission simulation model of CNCC is established by PIC simulation software. Simulation results show that this simulation model is suited for describing the experimental results and laying the foundation for the development of CNCC electron optical system and radiation source devices.