The Comparison of Vacuum Performance in the Undulator Chambers Installed at the Taiwan Light Source
نویسندگان
چکیده
Several insertion devices (ID) have been built in the straight sections at Taiwan Light Source (TLS) to obtain coherent and high brightness photons. A W20 wiggler and a U5 undulator were installed in February of 1995 and March of 1997, respectively [1]. A U9 and an EPU5.6 undulator are to be installed in the April of 1999. Prior to the installation of insertion devices, U9 and EPU5.6, the ID chambers for these undulators have been installed during several previous shutdown periods. The comparison of vacuum performance in these undulator chambers, the effective pumping speed and the impact to the beam lifetime, etc., are described in this article.
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