Performance of cryogenic permanent magnet undulators at Taiwan Photon Source

Jui-Che Huang^1*, Chin-Kang Yang¹, Chih-Sheng Yang¹, Chih-Wei Chen¹, Ching-Shiang Hwang¹

¹Magnet group, National Synchrotron Radiation Research Center, Hsin-Chu City, Taiwan

* Presenter:Jui-Che Huang, email:huang.juiche@nsrrc.org.tw

A PrFeB-based CPMU (period length 15mm) has been constructed for the Taiwan Photon Source (TPS) to provide high brilliant X-rays. The main development goals of the TPS-CPMU are to achieve low-intrinsic-phase errors and high thermal stability against external heat loads. At the lowest PM temperature of 56 K, the CPMU can generate an effective magnetic field of 1.34 T in a gap of 4 mm. An in-situ and vacuum compatible field measurement system has been developed to characterize the magnetic fields at cryogenic temperatures and allowing corrections of gap errors. In this paper, the relevant technology and performance of the TPS-CPMU will be discussed .

Keywords: Undulator, X-ray, permanent magnet, Taiwan Photon Source