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Development of a hybrid helical microwiggler with four poles per period

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7 Author(s)
Tsunawaki, Y. ; Dept. of Electr. Eng. & Electron., Osaka Sangyo Univ., Japan ; Masaki, Y. ; Okuda, Y. ; Ohigashi, N.
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A compact strong test hybrid helical microwiggler has been designed and developed with ten periods, each with length 10 mm and four poles, and gap diameter of 5 mm. One period is constructed with four segments. Each segment has a thickness of 2.5 mm and consists of pentagonal permanent magnets and permendur poles. Each segment is stacked along the wiggler axis and is rotated by an angle of 90° to the adjacent segment. The outer width is only 72 mm. The wiggler is divided into two sections where two kinds of permanent magnet - one with apex angle of 90° and one with 120° - were installed in order to find out the effect of geometrical size for the field. Peak fields of 0.360 and 0.381 T were achieved with small rms variations of about 1.1% and 0.6%, respectively, depending on the geometrical size of the permanent magnet.

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Quantum Electronics, IEEE Journal of  (Volume:39 ,  Issue: 2 )