A PrFeB-based cryogenic permanent magnet undulator (CPMU) is under construction at the Taiwan Photon Source (TPS) to provide high brilliant X-rays. When magnets are cooled to 80 K, a CPMU with a period length of 15 mm and a gap of 4 mm can generate an effective magnetic field of 1.30 T. The main goals of TPS CPMU developments are low-intrinsic-phase errors and high thermal stability against diverse heat loads. Low-intrinsic-phase errors can be obtained by force-compensation modules on the out-of-vacuum girders in a four-support-point configuration. Furthermore, adjustments of the spring settings can lead to even lower undulator phase errors. Two cryo-coolers, each with a cooling capacity of 200W at 80 K, allow a high beam-induced heat load with external heat transfer of up to a few hundred watts. An in-situ and vacuum compatible field measurement system has been developed to characterize the magnetic field at cryogenic temperatures and allowing corrections of gap errors due to temperature variations. In this paper, the relevant technology and test results for the TPS-CPMU will be discussed including some CPMU observations associated with phase errors, magnetic field quality at cryogenic temperature.
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15 January 2019
PROCEEDINGS OF THE 13TH INTERNATIONAL CONFERENCE ON SYNCHROTRON RADIATION INSTRUMENTATION – SRI2018
11–15 June 2018
Taipei, Taiwan
Research Article|
January 15 2019
Development of cryogenic permanent magnet undulators at NSRRC
Jui-Che Huang;
Jui-Che Huang
a)
1
National Synchrotron Radiation Research Center
, Hsinchu Science Park, Hsinchu,30073, Taiwan
a)Corresponding author: huang.juiche@nsrrc.org.tw
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Hideo Kitamura;
Hideo Kitamura
2
RIKEN SPring-8 Center
, 1-1-1 Kouto, Mikazuki-cho, Sayo-gun, Hyogo,679-5148, Japan
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Chih-Sheng Yang;
Chih-Sheng Yang
1
National Synchrotron Radiation Research Center
, Hsinchu Science Park, Hsinchu,30073, Taiwan
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Ching-Kang Yang;
Ching-Kang Yang
1
National Synchrotron Radiation Research Center
, Hsinchu Science Park, Hsinchu,30073, Taiwan
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Shinsaku Mizumoto;
Shinsaku Mizumoto
3
NEOMAX ENGINEERING Co., Ltd
, Suita-shi, Osaka, 564-0002 Japan
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Cheng-Hsiang Chang;
Cheng-Hsiang Chang
1
National Synchrotron Radiation Research Center
, Hsinchu Science Park, Hsinchu,30073, Taiwan
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Ching-Shiang Hwang
Ching-Shiang Hwang
1
National Synchrotron Radiation Research Center
, Hsinchu Science Park, Hsinchu,30073, Taiwan
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a)Corresponding author: huang.juiche@nsrrc.org.tw
AIP Conf. Proc. 2054, 030022 (2019)
Citation
Jui-Che Huang, Hideo Kitamura, Chih-Sheng Yang, Ching-Kang Yang, Shinsaku Mizumoto, Cheng-Hsing Chang, Cheng-Hsiang Chang, Ching-Shiang Hwang; Development of cryogenic permanent magnet undulators at NSRRC. AIP Conf. Proc. 15 January 2019; 2054 (1): 030022. https://doi.org/10.1063/1.5084585
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