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                                 Abstract:The focusing properties of a space-charge lens depend on the size,shape and density distribution of its electron cloud.In this paper these parameters are discussed by both numerical and analytical methods.
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                        References
	
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				| [1] | Medina Ablikim
								, HUANG Wei-Cheng
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								. New Realization of N=2 Supersymmetric QuantumMechanics and Shape Invariance. Chinese Physics C,
							2002, 26(4): 338-345. |  
				| [2] | Li Yangguo
								. Antiproton -Nucleus Charge Exchange Reaction and Inelastic Scattering. Chinese Physics C,
							1996, 20(11): 1021-1027. |  
 
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