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                                 Abstract:As the beam envelope mismatch is the major source of the halo formation and the related emittance growth in high intensity linac, some extensions based on the four-step method are developed, and the causes of beam mismatch in RFQ are analyzed and a matching dynamics method is proposed to minimize the emittance growth and the related beam loss. A dynamics example is given to prove this design method.
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                        References
	
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