A Hall Probe Calibration System at Low Temperature for the TPS Cryogenic Permanent Magnet Undulator

A cryogenic permanent-magnet undulator (CPMU) with a 15-mm period length is being constructed for the TPS. Field measurements of this undulator will be performed with a Hall probe at cryogenic temperatures, for which a field strength and temperature-dependent calibration system is necessary. This sy...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2018-04, Vol.28 (3), p.1-5
Main Authors: Chin-Kang Yang, Wen-Hsuan Hsieh, Yun-Liang Chu, Chang, C. H., Cheng-Ying Kuo, Sei-Da Chen, Jui-Che Huang, Ching-Shiang Hwang
Format: Article
Language:English
Subjects:
Calibration
cryogenic permanent-magnet undulator
Hall-probe calibration
Low temperature
Magnetic field measurement
magnetic field measurements in vacuum
Magnetic fields
Probes
Superconducting magnets
Temperature measurement
Temperature sensors
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Summary:A cryogenic permanent-magnet undulator (CPMU) with a 15-mm period length is being constructed for the TPS. Field measurements of this undulator will be performed with a Hall probe at cryogenic temperatures, for which a field strength and temperature-dependent calibration system is necessary. This system consists of a cryo-cooler and a heater to control the Hall probe temperature, a home-made dipole electromagnet, a nuclear magnetic resonant Tesla meter, and two angle adjusting stages. These stages will rotate the Hall probe to adjust the angular accuracy of the Hall probe axes with respect to a reference ceramic surface and to measure the planar Hall effect coefficient. A two-axis compact 0.9-mm SENIS Hall probe is used in the very small gap of 4 mm of this CPMU. Design details and performance of this system, its calibrating process, and calibration results at various temperatures will be discussed in this paper.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2018.2795575