August 27, 2017 to September 1, 2017
RAI Congress Center, Amsterdam, The Netherlands
Europe/Amsterdam timezone

Low temperature Hall probe calibration system for the TPS cryogenic permanent magnet undulator

Aug 31, 2017, 1:45 PM
1h 45m
Posters Area

Posters Area

Poster Presentation of 1h45m A3 - Wigglers and Undulators Thu-Af-Po4.03


Cheng-Ying Kuo (NSRRC)


A cryogenic permanent-magnet undulator (CPMU) with 15mm period length is being constructing for the TPS. Field measurement of this undulator will be performed at cryogenic temperature, so a field strength and temperature dependent calibration system of a Hall probe is necessary. This system consists of a cryocooler and a heater to control the Hall probe temperature, a home-made dipole electromagnet, a nuclear magnetic resonant teslameter (NMR), and two angle ad-justing stages. These stages will rotate the Hall probe to measure the angular accuracies of the Hall sensor axes with respect to the reference ceramic surfaces and the planar Hall effect coefficient. A two-axis compact SENIS Hall probe with thickness only 0.9vmm is adopted due to the very small gap (minimum gap 3vmm and nominal gap 4mm) of this CPMU. The detail designs of this system, alignment and calibrating process, and calibration results at various temperatures will be presented in this paper.

Submitters Country Taiwan

Primary author

Dr Chin-Kang Yang (National Synchrotron Radiation Research Center)


Mr Wen-Hsuan Hsieh (National Synchrotron Radiation Research Center) Mr Yung-Teng Yu (National Synchrotron Radiation Research Center) Jui-Che Huang (National Synchrotron Radiation Research Center) Yun-Liang Chu (National Synchrotron Radiation Research Center) Cheng-Ying Kuo (NSRRC) Dr Ching-Shiang Hwang (NSRRC)

Presentation materials