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                                 Abstract:According to the principle of the "uniform magnetization" and harmonic analytic method, the fields of the ring structure system with multi-segmented and trapezoidal magnet are analysed. The 3-dimensional expression of the field at any point of the space is given, and the 2-dimensional expression of the fundamental component of multipole, harmonic and leakage field is also given.The comparisons between the property of segmental and trapezoidal magnet are discussed.
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                        References
	
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