Rare-earth permanent magnets, a key component of synchrotron radiation sources and free electron lasers, operate in a high radiation environment (high energy photons, charged particles and neutrons). While resistance to irradiation is potentially critical to their routine operation, the detailed mechanism of radiation damage is not fully understood. This paper presents the most complete review published so far of the studies done on this subject, and tries to clarify the demagnetization process and the parameters involved. A simple scheme to follow in-situ the demagnetization of in vacuum undulators is also proposed.
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