Title :
Design and Performance of a New Magnetized Magnet Block on EPU Structure
Author :
Hwang, C.S. ; Chang, C.S. ; Lin, F.Y. ; Huang, M.H. ; Lin, P.H. ; Chang, C.H. ; Chen, H.H.
Author_Institution :
Inst. of Nat. Synchrotron Radiat. Res. Center, Hsinchu
fDate :
6/1/2008 12:00:00 AM
Abstract :
A prototype of an Apple-II elliptically polarized undulator (EPU4.6), of length 0.46 m, has been constructed to test the performance of the newly designed magnet block, which was magnetized at a tilt angle 10. The magnet design and various mechanism analysis are performed to clarify the error source of multipole field components. Good end pole design in the EPU4.6 revealed the variation of the first integral field strength as function of gap and phase is minimized. Shimming algorithm had been used to improve the field quality and phase error. We report here the scheme of the magnetized block arrangement, an analysis of the design mechanism, the end pole design, field shimming and the final test performance using the Hall-probe mapping system.
Keywords :
magnetic field measurement; permanent magnets; wigglers; Apple-II elliptically polarized undulator; EPU structure; EPU4.6; Hall-probe mapping system; end pole design; error source; field quality; field shimming; integral field strength; magnetic field measurement; magnetized block arrangement; magnetized magnet block; mechanism analysis; multipole field components; phase error; shimming algorithm; APPLE-II; elliptically polarized undulator; end pole design; magnetic field measurement;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2008.920782
