Field emission electron source for terahertz source application

Di Yunsong; Zhang Xiaobing; Lei Wei; Zhang Lifang; Cui Yunkang; Wang Qilong; Chen Jing

doi:10.3788/HPLPB20132506.1494

Volume 25 Issue 06

Apr. 2013

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Liu Meiqin, Liu Chunliang, Wang Hongguang, et al. RF input technology in A6 magnetron with diffraction output[J]. High Power Laser and Particle Beams, 2013, 25: 2636-2642. doi: 10.3788/HPLPB20132510.2636

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Di Yunsong, Zhang Xiaobing, Lei Wei, et al. Field emission electron source for terahertz source application[J]. High Power Laser and Particle Beams, 2013, 25: 1494-1498. doi: 10.3788/HPLPB20132506.1494

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Field emission electron source for terahertz source application

doi: 10.3788/HPLPB20132506.1494

1.
School of Physical Science and Technology,Nanjing Normal University,Nanjing 210097,China;
2.
School of Electronic Science and Engineering,Southeast University,Nanjing 210096,China;
3.
Department of Basic Courses,Nanjing Institute of Technology,Nanjing 211167,China

Received Date: 2012-11-12
Rev Recd Date: 2012-12-12
Publish Date: 2013-04-08

Abstract

Abstract

Field emission from carbon nanotube (CNT) has been simulated by a particle-in-cell (PIC) software at pico-second level. The emission current, current density and focus character of a CNT cathode have been discussed. In a diode configuration, the emission current from cathode reaches 1.85 A/cm2 when the anode voltage is 2 kV. While in a triode configuration, the current reaches 2.3 A/cm2 for a gate voltage of 700 V, and the focus performance of electron beam can be optimized by modifying triode parameters and voltage applied to the electrodes. A diode structure with CNT cathode has been fabricated to verify large-current field emission, a total emission current of 52.1 mA and a current density of 6.6 A/cm2 have been obtained from this diode. It proved that field emission cathode can be applied in terahertz source devices.
- field emission,
- electron beam,
- terahertz source,
- current density

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