Author: Chang, C.H.
Paper Title Page
TUZB02 Challenge of In-vacuum and Cryogenic Undulator Technologies 1080
  • J.C. Huang, C.-H. Chang, C.H. Chang, T.Y. Chung, C.-S. Hwang, C.K. Yang, Y.T. Yu
    NSRRC, Hsinchu, Taiwan
  • H. Kitamura
    RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
  An in-vacuum undulator (IVU) opens the utilization of high-brilliance X-rays in the medium energy storage rings. The development of a short-period undulator with low phase error becomes important to bring X-ray into a new unprecedented brilliant light source in an ultimate storage ring (USR). NdFeB or PrFeB cryogenic permanent magnet undulators (CPMUs) with a short period have been developed worldwide to obtain high brilliance of undulator radiation. A CPMU has high resistance against beam-induced heat load and allow to operate at a narrow gap. In a low emittance or ultimate storage ring, not only the performance of an undulator but the choice of the lattice functions is very important to obtain high bril-liance of synchrotron radiation. The optimum betatron functions and zero dispersion function shall be given for a straight section at IVU/CPMUs. In this paper, the relevant factors and design issues for IVU/CPMU will be discussed. Many technological challenges of a short-period undulator associated with beam induced-heat load, phase errors, and the deformation of in-vacuum girders will also be presented herein.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUZB02  
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THPOW049 Status of Insertion Devices at Taiwan Photon Source 4054
  • T.Y. Chung, C.-H. Chang, C.H. Chang, M.-S. Chiu, J.C. Huang, C.-S. Hwang, J.C. Jan, C.-C. Kuo, Y.-C. Liu, F.H. Tseng, C.K. Yang
    NSRRC, Hsinchu, Taiwan
  The storage ring of Taiwan Photon Source (TPS) has eighteen short straight sections (length 7 m) and six long straight sections (length 12 m). In phase I, three elliptically polarized undulators of type APPLE II and seven in-vacuum undulators, which included four in-vacuum undulators and two elliptically polarized undulators in three double mini-βy sections, were installed. Commissioning of the insertion devices began in 2015 November. The influence of insertion devices on the electron beam and the results after compensation are presented. Problems during the commissioning induced by the electron beam and by radiation, and their solutions, are also explained. For insertion devices in phase II and for devices developed in TPS, the preliminary designs are presented herein, to cover from the VUV to the hard X-ray region.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW049  
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