Performance of an advanced elliptically polarized undulator with shimming

Autor:	Ching-Shiang Hwang, F. Y. Lin, K. T. Hsu, Jenny Chen, C. Wang, Ho-Ping Chang, T.C. Fan, H.H. Chen, C.H. Chang
Rok vydání:	2002
Předmět:	Physics Optics business.industry Distortion Magnet Synchrotron radiation Elliptical polarization Undulator business Polarization (waves) Instrumentation Storage ring Beam (structure)
Zdroj:	Review of Scientific Instruments. 73:1436-1439
ISSN:	1089-7623 0034-6748
DOI:	10.1063/1.1445486
Popis:	A 4-m-long elliptically polarizing undulator (EPU5.6) device with an Apple-II structure is installed in the Synchrotron Radiation Research Center storage ring. This is the longest EPU device with an Apple-II structure worldwide. The errors of the magnet construction and the assembly process are among the several factors that can degrade the spectral performance. This study describes the mechanical design concept and construction that reduce magnetic field errors to keep high performance of the magnet. The electron orbit distortion in various polarization radiation modes is discussed with reference to a global feedback system and a feed forward table with following gap and phase. The beam dynamic effects are also investigated when the phase and magnetic gap are changed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7c8d79eb4728e6565238029cd8296ac2 https://doi.org/10.1063/1.1445486 Zobrazit plný text záznamu