Effects of neutron irradiation on Nd-Fe-B magnetic properties

Cost, J.R.; Brown, Robert D.; Giorgi, A.L.; Stanley, J.T.

doi:10.1109/20.3393

Cited by 44 publications

(25 citation statements)

References 2 publications

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“…When placed in a high-energy storage ring, these permanent magnets are subjected to irradiation from synchrotron radiation, high-energy bremsstrahlung, and bremsstrahlung-produced neutrons. Previous investigations have exhibited varying degrees of degradation in the intensity of magnetization of these magnets [3] due to irradiation from electron beams [4,5,6,7,8], 60 Co γ-rays [5,7,9], and high-energy neutrons [3,10,11]. The APS specifically uses Nd-Fe-B permanent magnets in the insertion devices [2].…”

Section: Introductionmentioning

confidence: 99%

Radiation-induced demagnetization of Nd-Fe-B permanent magnets.

Alderman¹,

Job²,

Martin³

et al. 2001

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Section: Introductionmentioning

confidence: 99%

Radiation-induced demagnetization of Nd-Fe-B permanent magnets.

Alderman¹,

Job²,

Martin³

et al. 2001

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“…However, the superior magnetic properties of NdFeB magnets make them a good choice for many accelerator applications. For this reason there are many papers looking at their resistance to protons [4,6,7,8,9,10], neutrons [5,11,12,13,14], electrons [15,16,17,18,19] and gammas [17,20,21,22]. These studies show that the amount of demagnetisation observed is not dependent on the deposited energy, but depends on the type of particle [19].…”

Section: Effect Of Radiation On Magnetsmentioning

confidence: 97%

Design considerations and performance of a PM linear actuator in a radiation environment

Mohammad

Booth

Hodgson

et al. 2008

4th IET International Conference on Power Electronics, Machines and Drives (PEMD 2008)

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This paper discusses design considerations for a water cooled high acceleration 3-phase air-cored brushless DC PM linear actuator used in a vacuum radiation environment. Radiation can cause damage to magnets, and the requirement for a vacuum chamber around the moving parts imposes additional constraints that further complicate the electromagnetic and mechanical design of the actuator. This paper discusses the selection of suitable materials and bearings that are compatible with operation in vacuum and can cope with the required millions of actuation cycles. The selection of suitable bearings with low friction and wear is discussed and the design of a low inertia shaft is described. The factors that have an influence on the susceptibility of the magnets to radiation damage are discussed. These factors include magnet dimensions, magnet material, external magnetic field, temperature and the directions of both the magnetic flux and radiation. FLUKA simulations are presented showing the fluences of protons, neutrons, electrons and gamma radiation to which the magnets are exposed.Based on these simulations, loss of magnetisation for different magnet materials can be predicted, and used to estimate the effect of magnet radiation ageing on actuator current, and increased temperature rise. The paper also presents transient electromagnet FEA computation of the force produced by the actuator when magnets are housed in a stainless steel vacuum chamber.

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“…Earlier investigations have exhibited varying degrees of demagnetization of these magnets [3] due to irradiation from electron beams [4,5,6], 60 Co γ-rays [5], and high-energy neutrons [7,8]. Radiationinduced demagnetization has been observed in the APS insertion devices [9] and was first measured in December of 2001.…”

Section: Introductionmentioning

confidence: 99%