Chinese Physics C > 1983, Vol. 7 > Issue(5): 583-588

STUDIES OF THE FOCUSING PROPERTIES OF A SPACE CHARGE LENS

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Abstract：
A space charge lens has been designed and tested which can be used to focus intense ion beams at several tens of keV. The experimental results obtained can be interpreted with a simplified physical model. The existence of a space charge field and its strong focusing properties are tested experimentally. And it is shown that the relaxation time for the formation of space charge field is much less than 10 μs under our experimental conditions, thus the lens can be used to focus pulsed beams with length of several hundereds of μs of longer.

References

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B.Von Bowies, E. Ruaka, Z. Physik, 76(1932),649.[2] D. Gabor, Nature, 160(1947), 89.[3] А. И. Мороэов, Док. Акα Нαyк СССР., 163(1965), 1963.[4] С. В. Лебедев, А. И. Мороэов, Ж. Т. Ф., 36(1966), 960.[5] R. Booth, H. W. Lefevre, N. 1. M., 151(1978), 143.[6] H.W.Lefecre, R, Booth, IEEE. Trans., NS26(1979), 8115.[7] R. M. Mobley, G. Ganunel, A. W. Masehke, IEEE. Trans., N526(1979), 3112.

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[3]	SUN Zhen-Wu,HUO Yu-Ping,LI Yu-Xiao,LI Tao. Study of Extraction Property of RF Ion Source. Chinese Physics C, 2006, 30(9): 902-906.
[4]	LIU Yong. Space Charge and Longitudinal Stationarity in Bunched Beams. Chinese Physics C, 2003, 27(12): 1128-1132.
[5]	DENG Jian-Jun,WANG Jian-Guang,Reiser Martin,Godlove Terry. Longitudinal Focusing Design of Space-Charge Dominated Beams. Chinese Physics C, 2003, 27(12): 1119-1122.
[6]	OUYANG Hua-Fu. Effects of the Space Charge Forces and the Beam Halo in an AVF Cyclotron with Intense Beam Currents. Chinese Physics C, 2001, 25(6): 561-570.
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[8]	Chen Yinbao,Huang Zhibin. Nonlinear Space Charge Effects and Emittance Growth in Linac. Chinese Physics C, 1999, 23(12): 1231-1242.
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[12]	Huang Zhibin,Chen Yinbao. Simulation of Halo Formation in Breathing Round Beams in a Uniform or Periodic Focusing Channel. Chinese Physics C, 1998, 22(10): 943-950.
[13]	Zheng Wenli,Jiang Xiaoming,Wu Jiayang,Jing Yuhui,Liu Gongchun. Studies on Focusing Performances of the Bent Crystal Monochromator. Chinese Physics C, 1995, 19(9): 858-864.
[14]	SONG Zhong-Heng,WANG Xiao-Min. Calculation of Space Charge Field for Annulus and Disc Bunch of Charged Particles. Chinese Physics C, 1991, 15(1): 7-12.
[15]	YU Qing-Chang,QIU Hong,HUANG Jia-Chang. Relations Between Focusing Power of Space-Charge Lenses and External Electromagnetic Fields. Chinese Physics C, 1991, 15(1): 13-16.
[16]	YU Qing-Chang. ELECTRON CLOUDS IN AXIAL SYMMETRIC SPACE-CHARGE LENSES. Chinese Physics C, 1989, 13(4): 298-301.
[17]	YUAN Qin-Liang,WANG You-Zhi,SHI Cai-Tu,CHEN Guan-Xiong,ZHANG Shu-Xiang,CHEN Ren-Huai,LIU Mao-San. APPLICATION OF PERMANENT MAGNET LENSES IN ACCELERATORS BEAM TRANSPORT AND FOCUSING. Chinese Physics C, 1987, 11(1): 11-15.
[18]	WEI Kai-Yu,LIN Zhen-Hua. THE DESIGN AND STUDY OF SPACE CHARGE EFFECT FOR THE BPL 750keV BEAM TRANSPORT SYSTEM. Chinese Physics C, 1984, 8(5): 588-595.
[19]	FANG SHOU-XIAN. COMPENSATION OF THE SPACE CHARGE FORCE IN A SYNCHROTRON BY MEANS OF RF QUADRUPOLE. Chinese Physics C, 1981, 5(2): 169-175.
[20]	Yu Qing-chang. THEORY OF NONLINEAR SPACE-CHARGE EFFECTS OF LOW ENERGY INTENSE CHARGED PARTICLE BEAMS. Chinese Physics C, 1980, 4(5): 579-587.

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QIU Hong, CHEN Jian-Pu and XU Jian-Ming. STUDIES OF THE FOCUSING PROPERTIES OF A SPACE CHARGE LENS[J]. Chinese Physics C, 1983, 7(5): 583-588.

QIU Hong, CHEN Jian-Pu and XU Jian-Ming. STUDIES OF THE FOCUSING PROPERTIES OF A SPACE CHARGE LENS[J]. Chinese Physics C, 1983, 7(5): 583-588. shu

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Received: 1900-01-01
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

STUDIES OF THE FOCUSING PROPERTIES OF A SPACE CHARGE LENS

Corresponding author:QIU Hong,

Received Date:1900-01-01
Accepted Date:1900-01-01
Available Online:1983-10-05

Abstract:A space charge lens has been designed and tested which can be used to focus intense ion beams at several tens of keV. The experimental results obtained can be interpreted with a simplified physical model. The existence of a space charge field and its strong focusing properties are tested experimentally. And it is shown that the relaxation time for the formation of space charge field is much less than 10 μs under our experimental conditions, thus the lens can be used to focus pulsed beams with length of several hundereds of μs of longer.