The fringing field of a dipole magnet with a c-type circuit and homogeneous field in the gap has been measured including the distributions of fringing fields with and without magnetic shield. The measured data was analyzed by using the concept of virtual field boundary.
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H. A. Enge , Focusing of charged Particles , Vol. 2 , p. 239 .
H. HU Bner and H. Wollnik , Nucl. Instr. Meth ., 86 , 141 ( 1976 ).