ABSTRACT: The Siam Photon Source is a 1 GeV electron storage ring for a synchrotron light source, now under
test commissioning in Nakhon Ratchasima, Thailand. The bending magnets of the storage ring produce
synchrotron light with photon energy usable up to the soft x-rays regions. In order to extend the usable
photon spectrum to higher photon energies an insertion device with high magnetic field has to be installed
into the storage ring. This report presents studies of perturbations from the magnetic field of such a device
on the electron beam dynamics in the storage ring of the Siam Photon Source. The magnetic field of the
device is simulated from arrays of permanent magnets. Random errors of the magnetic structure are included
to take into account imperfection of a real device. Effects of perturbations from the magnetic field of the
device on the electron beam dynamics are calculated. Possibilities to compensate the perturbations are
investigated.
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School of Physics, Institute of Science, Suranaree University of Technology, 111 University Ave.,
Nakhon Ratchasima 30000, Thailand.
National Synchrotron Research Center, P.O. Box 93, Nakhon Ratchasima 30000, Thailand.
* Corresponding author, E-mail: supagorn@nsrc.or.th
Received 26 Jul 2004,
Accepted 4 Feb 2005
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