MEDSI2018 - List of Authors (Hwang, C.-S.)

Paper	Title	Page
TUPH06	Construction of a Twin-Helix Undulator Prototype
	C.-H. Chang, C.H. Chang, T.Y. Chung, C.-S. Hwang, C.Y. Kuo NSRRC, Hsinchu, Taiwan C.-S. Hwang NCTU, Hsinchu, Taiwan
	Funding: This work was supported in part by the Ministry of Science and Technology of Taiwan under contract MOST106-2221-E-213-001-MY2. A Twin-Helix Undulator (THU) with a period length of 24 mm was designed to produce strong and homogeneous helical fields within a 5 mm diameter aperture. A 10-period prototype was constructed to test mechanical and magnetic performance characteristics. The prototype is composed of four helically shaped magnet arrays, which are designed to produce helical and linear fields by shifting its diagonal magnet arrays. A quadrant and half of the magnetic arrays are evaluated to verify the magnetic field performance. Helical array girders were assembled in a rectangular box-like frame with a cross-roller guideway. Mechanical considerations and field analysis of the THU are discussed in this note. [1] C.Y. Kuo et al., IEEE Transactions on Applied Superconductivity, 28, 4100805 (2018). [2] T.Y. Chung et al., Synchrotron Radiat. News Vol.31, No. 3 (2018).
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TUPH19	A Mechanical Undulator Frame to Minimize Intrinsic Phase Errors	69
	J.C. Huang, C.H. Chang, C.-S. Hwang, C.S. Yang, C.K. Yang NSRRC, Hsinchu, Taiwan H. Kitamura RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan S. M. Mizumoto NEOMAX Co., Ltd., Mishima-gun, Osaka, Japan
	A PrFeB-based cryogenic permanent magnet undu-lator (CPMU) is under construction at the Taiwan Photon Source (TPS) to generate brilliant X-rays. When magnets are cooled to 77 K, a CPMU with a period length of 15 mm can generate an effective magnetic field of 1.32 T in a gap of 4 mm. A main feature of the TPS CPMU is its low-intrinsic-phase errors by the installation of force-compensation modules on the out-of-vacuum girders in a four-support-points configuration. Moreover, adjusting the spring settings one can obtain very low undulator phase errors. In this paper, a mechanical frame design for the TPS-CPMU with force-compensating spring modules will be discussed. Observations of deformation effects of the out-of-vacuum girders on the CPMU will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH19
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Paper

Title

Page

TUPH06

Construction of a Twin-Helix Undulator Prototype

C.-H. Chang, C.H. Chang, T.Y. Chung, C.-S. Hwang, C.Y. Kuo
NSRRC, Hsinchu, Taiwan
C.-S. Hwang
NCTU, Hsinchu, Taiwan

Funding: This work was supported in part by the Ministry of Science and Technology of Taiwan under contract MOST106-2221-E-213-001-MY2.
A Twin-Helix Undulator (THU) with a period length of 24 mm was designed to produce strong and homogeneous helical fields within a 5 mm diameter aperture. A 10-period prototype was constructed to test mechanical and magnetic performance characteristics. The prototype is composed of four helically shaped magnet arrays, which are designed to produce helical and linear fields by shifting its diagonal magnet arrays. A quadrant and half of the magnetic arrays are evaluated to verify the magnetic field performance. Helical array girders were assembled in a rectangular box-like frame with a cross-roller guideway. Mechanical considerations and field analysis of the THU are discussed in this note.
[1] C.Y. Kuo et al., IEEE Transactions on Applied Superconductivity, 28, 4100805 (2018).
[2] T.Y. Chung et al., Synchrotron Radiat. News Vol.31, No. 3 (2018).

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TUPH19

A Mechanical Undulator Frame to Minimize Intrinsic Phase Errors

69

J.C. Huang, C.H. Chang, C.-S. Hwang, C.S. Yang, C.K. Yang
NSRRC, Hsinchu, Taiwan
H. Kitamura
RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
S. M. Mizumoto
NEOMAX Co., Ltd., Mishima-gun, Osaka, Japan

A PrFeB-based cryogenic permanent magnet undu-lator (CPMU) is under construction at the Taiwan Photon Source (TPS) to generate brilliant X-rays. When magnets are cooled to 77 K, a CPMU with a period length of 15 mm can generate an effective magnetic field of 1.32 T in a gap of 4 mm. A main feature of the TPS CPMU is its low-intrinsic-phase errors by the installation of force-compensation modules on the out-of-vacuum girders in a four-support-points configuration. Moreover, adjusting the spring settings one can obtain very low undulator phase errors. In this paper, a mechanical frame design for the TPS-CPMU with force-compensating spring modules will be discussed. Observations of deformation effects of the out-of-vacuum girders on the CPMU will be presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH19

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