Author:
Chuang Ping-Shun,Chiang Hsiao-Wei,Huang Jui-Che,Kitamura Hideo,Wang Pei-Jen
Abstract
Abstract
A small RMS phase error and long-term stability of the
gap-drive system are important criteria for realizing high
performance undulators. The use of force compensating spring modules
of self-contained type move toward the goals. Since magnetic forces
from girders are vanished entirely at the spring module, so not only
the small systematic phase error derived from deformation of the
girders but also the small dynamic loadings on the mechanical frame
and gap-drive system. Moreover, spring modules provide a
supplemental mechanism to correct magnetic field errors at varied
gaps. Such mechanism is particular benefit for the cryogenic
permanent magnet undulators because the field errors of undulator
shall correct in both cryogenic mode and room temperature mode.
Subject
Mathematical Physics,Instrumentation