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The cascade effect of cathode spots from vacuum micro-arcing has been observed by micro-channel plate (MCP) imager in divect current mode. The spots-track on MCP surface can be drawn out as a multiform dog-leg path，and betweencenters of spots is 200—300 μm. The first spot is always the lucida，and its intensity is about decuple of its sub-spots. The intensity between cascade sub-spots is at the same level，and sub-spots are nondestructive for MCP cathode surface. The experiments showed that arcing of sub-spots depends on emission of the first spot.
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Keywords:
- cathode spot /
- micro-arc cascade effect /
- micro-channel plate imager
[1] ［1］Beilis I I 2001 IEEE Trans. Plasma Sci. 29 657
[2] ［2］Boxman R L，Goldsmith S 1997 IEEE Trans. Plasma Sci. 25 1174
[3] ［3］Jüttner B 2001 J. Phys. D: Appl. Phys. 34 R103
[4] ［4］Puchkarev V F，Bochkarev M B 1994 J. Phys. D: Appl.Phys. 27 1214
[5] ［5］Daybelge U 1985 Phys. Fluids 28 312
[6] ［6］Yang J，Liu W Y，Zhu G Q，Mao G W 2007 Acta Phys. Sin. 56 366 (in Chinese) ［杨涓、刘文一、朱国强、毛根旺 2007 56 366］
[7] ［7］Zheng J，Li Z C，Zhang H，Yu C X，Yabuuchi T, Tanaka K 2007 Chin. Phys. 16 3009
[8] ［8］Zhang Z Y，Lu X C, Luo J B 2007 Chin. Phys. 16 3790
[9] ［9］Xu D L 1990 High Speed Camera of the Imaging Tube (Beijing: Science Press) p131 (in Chinese) ［徐大纶 1990 变像管高速摄影(北京: 科学出版社)第131页］
[10] ］Kikenny J D 1991 Laser and Particle Beams 9 49
[11] ］Cao Z R，Ding Y K，Zhang H Y，Bai X H，Liu B Y，Bai Y L 2007 High Power Laser Part. Beams 19 321 (in Chinese) ［曹柱荣、丁永坤、张海鹰、白晓红、刘百玉、白永林 2007 强激光与粒子束 19 321］
[12] ］Lafferty J M 1980 Vacuum Arc Theory and Application (New York: John Wiley and Sons. Inc.) p230
[13] ］He Z W，Zhen C M，Lan W，Wang Y Y 2003 Acta Phys. Sin. 52 3130 (in Chinese) ［何志巍、甄聪棉、兰伟、王印月 2003 52 3130］
[14] ］Li J J，Wu H H，Long B Y，Lü X Y，Hu C Q，Jin Z S 2005 Acta Phys. Sin. 54 1447 (in Chinese) ［李俊杰、吴汉华、龙北玉、吕宪义、胡超权、金曾孙 2005 54 1447］
[15] ］Wu H H，Long B H，Lü X Y，Wang J B，Jin Z S 2005 Acta Phys. Sin. 54 1697 (in Chinese) ［吴汉华、龙北红、吕宪义、汪剑波、金曾孙 2005 54 1697］
[16] ］Wu H H，Long B H，Long B Y，Tang Y G，Chang H，Bai Y Z 2007 Acta Phys. Sin. 56 6537 (in Chinese) ［吴汉华、龙北红、龙北玉、唐元广、常鸿、白亦真 2007 56 6537］
[17] ］Dyke W P，Trolan J K，Martin E E 1953 Phys. Rev. 91 1043
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[1] ［1］Beilis I I 2001 IEEE Trans. Plasma Sci. 29 657
[2] ［2］Boxman R L，Goldsmith S 1997 IEEE Trans. Plasma Sci. 25 1174
[3] ［3］Jüttner B 2001 J. Phys. D: Appl. Phys. 34 R103
[4] ［4］Puchkarev V F，Bochkarev M B 1994 J. Phys. D: Appl.Phys. 27 1214
[5] ［5］Daybelge U 1985 Phys. Fluids 28 312
[6] ［6］Yang J，Liu W Y，Zhu G Q，Mao G W 2007 Acta Phys. Sin. 56 366 (in Chinese) ［杨涓、刘文一、朱国强、毛根旺 2007 56 366］
[7] ［7］Zheng J，Li Z C，Zhang H，Yu C X，Yabuuchi T, Tanaka K 2007 Chin. Phys. 16 3009
[8] ［8］Zhang Z Y，Lu X C, Luo J B 2007 Chin. Phys. 16 3790
[9] ［9］Xu D L 1990 High Speed Camera of the Imaging Tube (Beijing: Science Press) p131 (in Chinese) ［徐大纶 1990 变像管高速摄影(北京: 科学出版社)第131页］
[10] ］Kikenny J D 1991 Laser and Particle Beams 9 49
[11] ］Cao Z R，Ding Y K，Zhang H Y，Bai X H，Liu B Y，Bai Y L 2007 High Power Laser Part. Beams 19 321 (in Chinese) ［曹柱荣、丁永坤、张海鹰、白晓红、刘百玉、白永林 2007 强激光与粒子束 19 321］
[12] ］Lafferty J M 1980 Vacuum Arc Theory and Application (New York: John Wiley and Sons. Inc.) p230
[13] ］He Z W，Zhen C M，Lan W，Wang Y Y 2003 Acta Phys. Sin. 52 3130 (in Chinese) ［何志巍、甄聪棉、兰伟、王印月 2003 52 3130］
[14] ］Li J J，Wu H H，Long B Y，Lü X Y，Hu C Q，Jin Z S 2005 Acta Phys. Sin. 54 1447 (in Chinese) ［李俊杰、吴汉华、龙北玉、吕宪义、胡超权、金曾孙 2005 54 1447］
[15] ］Wu H H，Long B H，Lü X Y，Wang J B，Jin Z S 2005 Acta Phys. Sin. 54 1697 (in Chinese) ［吴汉华、龙北红、吕宪义、汪剑波、金曾孙 2005 54 1697］
[16] ］Wu H H，Long B H，Long B Y，Tang Y G，Chang H，Bai Y Z 2007 Acta Phys. Sin. 56 6537 (in Chinese) ［吴汉华、龙北红、龙北玉、唐元广、常鸿、白亦真 2007 56 6537］
[17] ］Dyke W P，Trolan J K，Martin E E 1953 Phys. Rev. 91 1043
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