US 10,485,089 B2
Helical permanent magnet structure and undulator using the same
Cheng-Ying Kuo, Hsinchu (TW); Cheng-Hsing Chang, Hsinchu (TW); and Cheng-Hsiang Chang, Hsinchu (TW)
Assigned to NATIONAL SYNCHROTRON RADIATION RESEARCH CENTER, Hsinchu (TW)
Filed by NATIONAL SYNCHROTRON RADIATION RESEARCH CENTER, Hsinchu (TW)
Filed on Sep. 7, 2017, as Appl. No. 15/697,481.
Prior Publication US 2019/0075646 A1, Mar. 7, 2019
Int. Cl. H01F 5/00 (2006.01); H05H 7/04 (2006.01); H01F 7/02 (2006.01); H05H 13/04 (2006.01); H01S 3/09 (2006.01)
CPC H05H 7/04 (2013.01) [H01F 7/0278 (2013.01); H05H 13/04 (2013.01); H01S 3/0903 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A helical permanent magnet structure, comprising:
at least one magnet assembly, comprising:
a plurality of permanent magnets with a magnetization direction, the permanent magnets being formed as helical shape and arranged as a helical surface, and the center of the helical surface having a longitudinal passage for being passed through by a charged particle; and
a plurality of poles with the same amount of the permanent magnets, wherein the poles are magnetized by the permanent magnets and absorb on one side of the permanent magnets; and
an inner frame surrounding outside and limiting the magnet assembly,
wherein the magnet assembly further comprises a plurality of positioning members, and the permanent magnets and the poles are positioned in the inner frame.