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TUPE41 |
Design and Development of a System of Hybrid Type to Measure the Magnetic Field of a Cryogenic Undulator |
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- C.H. Chang, S.D. Chen, J.C. Huang, C.-S. Hwang, C.K. Yang
NSRRC, Hsinchu, Taiwan
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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.
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Poster TUPE41 [1.374 MB]
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE41
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About • |
paper received ※ 08 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017 |
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