NDLI: A Measurement System In Situ to Measure the Magnetic Field of an In-Vacuum Undulator

Content Provider	IEEE Xplore Digital Library
Author	Chin-Kang Yang Cheng-Hsing Chang Jui-Che Huang Ching-Shiang Hwang Ting-Yi Chung
Copyright Year	2002
Abstract	Two in-vacuum undulators (length 2 m) with period 22 mm (IU22) are constructed to be installed in the Taiwan Photon Source (TPS, 3 GeV) to provide a highly brilliant light source at hard X-ray energies. To verify ultimately the magnetic fields of these IU before installation in the storage ring, we have developed a system to measure the magnetic field in vacuum. To avoid contamination of the vacuum chambers, all components of the system are compatible with high vacuum. During actuation along the longitudinal direction, the positions of the Hall probe are monitored with optical devices and corrected with three two-axis stages. The deviations of position of the Hall probe with dynamic correction are less than 5 μm. The phase error reproducibility of this system is 0.15° and the first integral reproducibility is 13 G·cm. We applied this system to measure the magnetic performance of our in-vacuum undulators at varied gaps of the magnet array. The results of those measurements show no significant difference after assembly of the magnet arrays inside the chamber. The details of design and construction of this system are described, together with the results of measuring the magnetic field of the IU22.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1
Ending Page	5
Page Count	5
File Size	1651545
File Format	PDF
ISSN	10518223
Volume Number	24
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic field measurement Undulators Magnetic fields Probes Pollution measurement Rails Superconducting magnets in-vacuum undulators Cryogenic permanent magnet undulators Hall-probe measurement in-vacuum magnetic field measurements
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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