Development of a Hybrid Helical Microwiggler with Four Poles per Period

Abstract

A test hybrid helical microwiggler with 4 poles per period has been designed and developed with parameters such as period of 10 mm, gap diameter of 5 mm and periodical number of 10. One period of its wiggler is constructed with four segments. Each of them has a thickness of 2.5 mm and consists of pentagonal permanent magnets and permendurs as ferromagnets. Each segment is stacked along wiggler axis rotating byangle of 90°C It is so small that the outer width is 72 mm. The measured peak field is 0.35 to 0.4 T depending on the gap space of 5.2 to 4.8 mm.