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A high current density cylindrical electron optics system is designed for extended interaction oscillator, including the design of electron gun and focusing magnetic field. To obtain good beam properties, a theory of ideal circular beam focusing is used in design. The focusing magnetic field is calculated by balancing the radial forces. CST PARTICLE STUDIO simulation under space-charge-limited emission model shows good beam qualities with a parallel beam flow throughout the gun and interaction sections. The simulation result is in good agreement with design theory, the beam mean current density attains 244 A/cm2, fill factor 767%, beam transmission 100%.
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Keywords:
- electron gun /
- focusing magnetic field /
- electron optics system /
- beam envelope
[1] ［1］Liu S G 2006 China Basic Science 8 7（in Chinese）［刘盛纲 2006 中国基础科学 8 7］
[2] ［2］Siegel P H 2002 IEEE Trans. Microwave Theory. Tech. 50 910
[3] ［3］Wang M H, Xue Q Z，Liu P K 2008 Journal of Electronics & Information Technology 30 1766（in Chinese）［王明红、薛谦忠、刘濮鲲 2008 电子与信息学报 30 1766］
[4] ［4］Zhang K C, Wu Z H, Liu S G 2008 IEEE 33rd International Conference on Infrared, Millimeter and Terahertz Waves p1
[5] ［5］Zhang K C, Wu Z H, Liu S G 2008 Chin. Phys. B 17 3402
[6] ［6］Srivastava A 2007 IEEE Vacuum Electronics Conference p1
[7] ［7］Booske J H 2008 Phys. Plasmas 15 055502
[8] ［8］Bemis T, Bhatt R, Chen C 2007 Appl. Phys. Lett .91 201504
[9] ［9］Pierce J R 1940 J. Appl. Phys. 11 552
[10] ］Nagy G A, Szilagyi M 1983 Introduction To The Theory of Space-Charge-Optics（Beijing: Science Press）p125 （in Chinese）［G. A.纳吉、M.西拉支 1983 空间电荷光学导论（北京：科学出版社） 第125页］
[11] ］Tang X Y, Shukla P K 2008 Phys. Plasmas 15 023702
[12] ］Balk M C 2008 IEEE Vacuum Electronics Conference p459
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[1] ［1］Liu S G 2006 China Basic Science 8 7（in Chinese）［刘盛纲 2006 中国基础科学 8 7］
[2] ［2］Siegel P H 2002 IEEE Trans. Microwave Theory. Tech. 50 910
[3] ［3］Wang M H, Xue Q Z，Liu P K 2008 Journal of Electronics & Information Technology 30 1766（in Chinese）［王明红、薛谦忠、刘濮鲲 2008 电子与信息学报 30 1766］
[4] ［4］Zhang K C, Wu Z H, Liu S G 2008 IEEE 33rd International Conference on Infrared, Millimeter and Terahertz Waves p1
[5] ［5］Zhang K C, Wu Z H, Liu S G 2008 Chin. Phys. B 17 3402
[6] ［6］Srivastava A 2007 IEEE Vacuum Electronics Conference p1
[7] ［7］Booske J H 2008 Phys. Plasmas 15 055502
[8] ［8］Bemis T, Bhatt R, Chen C 2007 Appl. Phys. Lett .91 201504
[9] ［9］Pierce J R 1940 J. Appl. Phys. 11 552
[10] ］Nagy G A, Szilagyi M 1983 Introduction To The Theory of Space-Charge-Optics（Beijing: Science Press）p125 （in Chinese）［G. A.纳吉、M.西拉支 1983 空间电荷光学导论（北京：科学出版社） 第125页］
[11] ］Tang X Y, Shukla P K 2008 Phys. Plasmas 15 023702
[12] ］Balk M C 2008 IEEE Vacuum Electronics Conference p459
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