MEDSI2016 - List of Authors (Huang, J.C.)

Paper	Title	Page
TUPE39	Feasibility of a 4.5-T Cryogenic Permanent-Magnet Wavelength Shifter
	C.-H. Chang, H.-H. Chen, J.C. Huang, C.-S. Hwang, Y.T. Yu NSRRC, Hsinchu, Taiwan C.-S. Hwang NCTU, Hsinchu, Taiwan
	Funding: Work supported by the Ministry of Science and Technology, ROC under Contract No. MOST 103-2221-E-213-001-MY2 A three-pole wavelength shifter with a cryogenic permanent magnet is designed to extend the critical photon energy in a 3-GeV storage ring to 27-keV Xrays. The cryogenic wavelength shifter has a PrFeB permanent magnet and a vanadium-cobalt-steel (Permendur) pole to produce a magnetic field of flux density 4.5 T at fixed gap 5 mm. The magnet structure is optimized to prevent irreversible demagnetization of the permanent magnet near 300 K. A 77-K cryo-cooler is used to cool the magnets and to maintain the magnets at a uniform temperature, 77 K, in the vacuum vessel. This work describes the advanced design of the magnetic field and the simulations of the cooling temperature for the compact wavelength-shifter magnet.
	Poster TUPE39 [1.949 MB]
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPE41	Design and Development of a System of Hybrid Type to Measure the Magnetic Field of a Cryogenic Undulator	251
	C.H. Chang, S.D. Chen, J.C. Huang, C.-S. Hwang, C.K. Yang NSRRC, Hsinchu, Taiwan
	Cryogenic permanent-magnet undulators (CU) have currently become the most important scheme serving as sources of hard X-rays in medium-energy facilities worldwide. One such set (length 2 m, period length 15 mm) is under development for Taiwan Photon Source (TPS). To obtain a magnetic-field distribution of the cryogenic undulator after it is cooled to an operating target temperature below 80 K, a device of hybrid type combining a Hall probe and stretched-wire method has been designed and developed, to perform the field measurement at low temperature and in an ultra-high vacuum environment. The Hall probe is used to measure the field on axis in the transverse and vertical directions; the stretched wire is utilized to measure the field integral in the vertical and horizontal directions in the horizontal plane. Unlike a conventional field-measurement system in air, this innovative system must be located in an ultra-high vacuum environment with limited clearance. This paper describes mainly the entire system, including kernel components, control systems and preliminary test results in detail.
	Poster TUPE41 [1.374 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE41
About •	paper received ※ 08 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

TUPE39

Feasibility of a 4.5-T Cryogenic Permanent-Magnet Wavelength Shifter

C.-H. Chang, H.-H. Chen, J.C. Huang, C.-S. Hwang, Y.T. Yu
NSRRC, Hsinchu, Taiwan
C.-S. Hwang
NCTU, Hsinchu, Taiwan

Funding: Work supported by the Ministry of Science and Technology, ROC under Contract No. MOST 103-2221-E-213-001-MY2
A three-pole wavelength shifter with a cryogenic permanent magnet is designed to extend the critical photon energy in a 3-GeV storage ring to 27-keV Xrays. The cryogenic wavelength shifter has a PrFeB permanent magnet and a vanadium-cobalt-steel (Permendur) pole to produce a magnetic field of flux density 4.5 T at fixed gap 5 mm. The magnet structure is optimized to prevent irreversible demagnetization of the permanent magnet near 300 K. A 77-K cryo-cooler is used to cool the magnets and to maintain the magnets at a uniform temperature, 77 K, in the vacuum vessel. This work describes the advanced design of the magnetic field and the simulations of the cooling temperature for the compact wavelength-shifter magnet.

Poster TUPE39 [1.949 MB]

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPE41

Design and Development of a System of Hybrid Type to Measure the Magnetic Field of a Cryogenic Undulator

251

C.H. Chang, S.D. Chen, J.C. Huang, C.-S. Hwang, C.K. Yang
NSRRC, Hsinchu, Taiwan

Cryogenic permanent-magnet undulators (CU) have currently become the most important scheme serving as sources of hard X-rays in medium-energy facilities worldwide. One such set (length 2 m, period length 15 mm) is under development for Taiwan Photon Source (TPS). To obtain a magnetic-field distribution of the cryogenic undulator after it is cooled to an operating target temperature below 80 K, a device of hybrid type combining a Hall probe and stretched-wire method has been designed and developed, to perform the field measurement at low temperature and in an ultra-high vacuum environment. The Hall probe is used to measure the field on axis in the transverse and vertical directions; the stretched wire is utilized to measure the field integral in the vertical and horizontal directions in the horizontal plane. Unlike a conventional field-measurement system in air, this innovative system must be located in an ultra-high vacuum environment with limited clearance. This paper describes mainly the entire system, including kernel components, control systems and preliminary test results in detail.

Poster TUPE41 [1.374 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE41

About •

paper received ※ 08 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)