[1] Zhao Hongping, Lei Wei, Zhang Xiaobing, Gu Wei, et al. Structure design for electron beam controllingin microwave tube with carbon nanotube cathode [J]. Journal of Southeast University (English Edition), 2006, 22 (2): 159-163. [doi:10.3969/j.issn.1003-7985.2006.02.004]

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Structure design for electron beam controllingin microwave tube with carbon nanotube cathode()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

22

Issue:

2006 2

Page:

159-163

Research Field:

Electronic Science and Engineering

Publishing date:

2006-06-30

Info

Title:

Structure design for electron beam controllingin microwave tube with carbon nanotube cathode

Author(s):

Zhao Hongping;  Lei Wei;  Zhang Xiaobing;  Gu Wei;  Li Xiaohua

Department of Electronic Engineering, Southeast University, Nanjing 210096, China

Keywords:

carbon nanotube;  electron chunnel;  transverse velocity of electrons

PACS:

TN124

DOI:

10.3969/j.issn.1003-7985.2006.02.004

Abstract:

To control the electron beam emitted from the carbon nanotube(CNT)cathode, four different electron chunnels are designed.A common basic structure used in the simulation is an insulating chunnel.When primary electrons hit the surface of the chunnel, secondary electrons are generated, which make the electron distribution at the exit hole of the chunnel more uniform.By analyzing and comparing the state of electrons emitted from the exit of chunnel among the four structures, an optimal structure is obtained.In the optimized structure, the electron distribution at the exit hole of the chunnel is more uniform and the electron beam is rather slim.Furthermore, by adding a magnetic field along the slow wave line, the electron beam can be constrained.In the optimized structure, a very small magnetic field is needed to make most of electrons pass through the slow wave line.

References:

[1] Milne W I, Teo K B K, Amaratunga G A J, et al.Aligned carbon nanotubes/fibers for applications in vacuum microwave devices [J].Current Applied Physics, 2004, 4(5):513-517.
[2] Makishima H, Miyano S, Imura H, et al.Design and performance of traveling-wave tubes using field emitters array cathodes [J].Applied Surface Science, 1999, 146(1-4):230-233.
[3] Sohn Jung Inn, Lee Seonghoon, Song Yoon-Ho, et al.Large field emission current density from well-aligned carbon nanotube field emitter arrays [J].Current Applied Physics, 2001, 1(1):61-65.
[4] Zhu Chunhui, Lou Chaogang, Lei Wei, et al.Fabrication and characterization of high-current-density carbon-nanotube cold cathode [J].Applied Surface Science, 2005, 251(1-4):249-253.
[5] Spindt C A, Holland C E, Schwoebel P R, et al.Field emitter array development for microwave applications [J].J Vac Sci Technol B, 1998, 16(2):758-761.
[6] Zhong Xuefei, van der Poel Wilbert, den Engelsen Daniel, et al.Monte Carlo calculation of electron transport through Hop and Flu spacers in HOPFED[A].In:Proceedings of ASID’04 [C]. Nanjing, China, 2004.203-206.
[7] Zhao Hongping, Lei Wei, Zhang Xiaobing, et al.Simulation of the cathode surface damages in a HOPFED [J].J Vac Sci Technol B, 2005, 23(6):3148-3152.

Memo

Memo:

Biographies: Zhao Hongping(1980—), female, graduate;Lei Wei(corresponding author), male, doctor, professor, lw@seu.edu.cn.

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