Effects of electron-beam and γ-ray irradiation on the magnetic flux of NdFeB and SmCo permanent magnets

Okuda, Shuichi; Ohashi, K.; Kobayashi, Nobuo

doi:10.1016/0168-583x(94)95358-9

Cited by 53 publications

(44 citation statements)

References 7 publications

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“…The published results that are probably most applicable to the APS IDS are those from the study of Okuda et al [4]. The magnet blocks that were used in that study were manufactured by Shin-Etsu, as were many of the magnet blocks used in the APS IDS.…”

Section: What Dose Is Required To Damage the Nd-fe-b Magnets?mentioning

confidence: 95%

“…Some of the work that has been done is not directly applicable to insertion device magnets, however, because the type of radiation used in the study (e.g., neutrons as opposed to electrons or photons) is not what is expected to cause radiation damage in a storage ring [ 111. Some [4]. A consideration in attempting to use published results to determine lifetimes of APS ID magnets is that wide variation in radiation sensitivity between magnets from different vendors has been reported in a number of studies [2, 3, 5 -S].…”

Section: What Dose Is Required To Damage the Nd-fe-b Magnets?mentioning

confidence: 99%

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Radiation doses to insertion devices at the advanced photon source

Moog¹,

Hartog²,

Semones³

et al. 1997

AIP Conference Proceedings

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Dase measurements made fin and around the insertion devices (IDS) at the Advanced Photon Source are reported. Attempts ar? made to ;c'mpare these dose rates to dose rate> that ha\? been reported to cause rndintipn-induced demagnctlrxion. bur comparisons are complicalted by such factors as the particular magnet material and the techniques used in its manufacture, the spectrum and type of radiation. and rhe demagnetizing field seen by the m.~gnet. The spectxm of radiation at the IDS ha5 been measured .~nd found to include J larse high-energy (7 GeV) component, at least durin,a some runs. Lead shielding installed immediately upstream of the IDS has been found to decrease the dose to the upstream ends of the IDS. It has almost no effect on the dose to the downstream ends of the IDS, however. since much of the radiation travels through the ID vacuum chamber and cannot be readily shielded. Opening the gaps of the IDS during injection and at other times also helps decrease the radiation exposure. INTRODUCTIOS

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Section: What Dose Is Required To Damage the Nd-fe-b Magnets?mentioning

confidence: 95%

Section: What Dose Is Required To Damage the Nd-fe-b Magnets?mentioning

confidence: 99%

Radiation doses to insertion devices at the advanced photon source

Moog¹,

Hartog²,

Semones³

et al. 1997

AIP Conference Proceedings

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“…The γ -ray irradiation of 2.8×10 6 Sv using Co decreased the magnetic flux by 0.5%, reported by Okuda et al 10) The neutron irradiation of 2.6×10 18 cm −2…”

Section: Circumstance For Inv-crdm Workingmentioning

confidence: 99%

Development of In-vessel Type Control Rod Drive Mechanism for Marine Reactor

Ishida

Imayoshi²,

Yoritsune

et al. 2001

Journal of Nuclear Science and Technology

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A highly reliable control rod drive mechanism (CRDM) installed inside the reactor vessel has developed for use of an advanced marine reactor. This CRDM contributes to compactness and simplicity of the reactor system, and it can eliminate the possibility of a rod ejection accident. The CRDM works in the high temperature and high pressure water-310 • C and 12 MPa, the same atmosphere as the primary loop. Driving force is produced by a synchronous motor with the rotor of a permanent magnet, which has been developed. An innovative latch mechanism using separable ball nuts can latch the driving shaft connecting the control rod and de-latch it for scram. The rod position detector using a magnetostrictive wire type sensor on the principle of Wiedeman effect has been developed, accuracy of which is verified to have a detecting error within 1.2 mm. Ball bearings for thrust and radial supports in rotation have been developed to be capable of working under the high temperature water for a long period. Under condition of high temperature water, the performance tests on latching, de-latching, holding and vertical movement, and durability test were conducted to verify the design conditions. This CRDM can be applied to not only the marine reactor, but also to light water reactors, PWR and BWR.

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“…21 The electron dose received by the SmCo magnets was 2/3 of that received by the NdFeB magnets, but the flux loss was much smaller than that ratio. Experiments have also been performed with 180 MeV electron beams.…”

Section: Low-and Medium-energy Electron Irradiationmentioning

confidence: 99%

LCLS prototype undulator report.

Dejus¹

2004

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Effects of electron-beam and γ-ray irradiation on the magnetic flux of NdFeB and SmCo permanent magnets

Cited by 53 publications

References 7 publications

Radiation doses to insertion devices at the advanced photon source

Radiation doses to insertion devices at the advanced photon source

Development of In-vessel Type Control Rod Drive Mechanism for Marine Reactor

LCLS prototype undulator report.

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