Title :
Magnetic Measurement and Shimming for EPU100 of SSRF
Author :
Zhang, Wei ; Lu, Jie ; Zhou, Qiaogen ; Wang, Hongfei
Author_Institution :
Shanghai Inst. of Appl. Phys., Shanghai, China
fDate :
6/1/2010 12:00:00 AM
Abstract :
An elliptically polarizing undulator EPU100 has been built in Shanghai Synchrotron Radiation Facility (SSRF) recently. This undulator adopts the APPLE-II type magnet configuration and has a total length 4.3 m with a period of 100 mm. It was designed to provide synchrotron radiations with various polarizations including the circular, the elliptical, the horizontally linear and the vertically linear polarizations. The magnetic measurement has been finished by using a 3-dimensional Hall probes and flipping coil system. This paper details the method of the magnetic measurement and shimming for EPU100. The maximum R.M.S. phase errors 3.8 and 2.2 are calculated from the measured magnetic fields respectively in the horizontally and vertically linear polarization modes.
Keywords :
electron beams; polarisation; synchrotron radiation; synchrotrons; 3-dimensional Hall probes; APPLE-II type magnet configuration; SSRF; Shanghai Synchrotron Radiation Facility; electron beam energy; elliptically polarizing undulator; flipping coil system; linear polarizations; magnetic measurement; magnetic shimming; phase errors; synchrotron radiations; APPLE-II; elliptically polarizing undulator; magnetic shimming;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2009.2039783
