CERN Accelerating science

Article
Title	A Magnetic Field Model for the Undulator in HLS
Author(s)	Zhang, He ; Li, Yongjun ; Wang, Lin
Affiliation	(DESY, Hamburg) ; (USTC/NSRL, Hefei, Anhui)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.3994
Subject category	Accelerators and Storage Rings
Abstract	It is important to understand the influence of wigglers and undulators on the beam dynamics in design and optimization of a storage ring, especially when the storage ring runs on a low emittance mode. We present an analytic model of the undulator field in HLS, which can be used in the tracking study to evaluate the effects of it. Coefficients needed by the model are generated by fitting to the results of a numerical field caculation. Fringe fields are included in this model. Then we use three different methods to track particles through the undulator, and compare the results.