Enhancing the Radiation Resistance of Undulator Permanent Magnets by Tilting the Easy Axis of Magnetization

The undulator is a magnetic device usually consisting of a series of rare-earth permanent magnets (REPMs) arranged to generate a sinusoidal magnetic field, and is installed in synchrotron radiation and free electron laser facilities to periodically deflect high-energy electrons. Because the undulato...

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Bibliographic Details
Published in:Physical review letters 2018-09, Vol.121 (12), p.124801-124801, Article 124801
Main Authors: Bizen, Teruhiko, Kinjo, Ryota, Tanaka, Takashi
Format: Article
Language:English
Subjects:
Food irradiation
Magnetic devices
Magnetism
Permanent magnets
Radiation damage
Radiation tolerance
Rare earth elements
Synchrotron radiation
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Summary:The undulator is a magnetic device usually consisting of a series of rare-earth permanent magnets (REPMs) arranged to generate a sinusoidal magnetic field, and is installed in synchrotron radiation and free electron laser facilities to periodically deflect high-energy electrons. Because the undulator is operated under a high-radiation environment, it is important to take possible measures to avoid the quality degradation, in particular the radiation damage of REPMs. We present a simple scheme to enhance the radiation resistance of REPMs in undulators, in which the easy axis of each REPM is tilted by 45°. Experimental studies have revealed that the radiation resistance of REPMs in this configuration is enhanced by an order of magnitude compared to that in the conventional undulator.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.121.124801