The effect of neutron irradiation on Nd-Fe-B and Sm/sub 2/Co/sub 17/-based high-temperature magnets

Chen, Christina; Talnagi, J.W.; Liu, J.; Vora, Payal; Higgins, A.; Liu, S.

doi:10.1109/tmag.2005.854985

Cited by 24 publications

(9 citation statements)

References 15 publications

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“…Unlike the stable SrFe 12 O 19 against oxidation, Nd 2 Fe 14 B magnet alloys show a very low resistance against corrosion by the fast oxidation of the Nd-and B-rich phase located around the grains of the Nd 2 Fe 14 B in various environments. 20 Moreover, we confirmed that this corrosion by -irradiation was suppressed at low temperature of 195 K as the study of Chen et al 13 about a neutron irradiation on Nd-Fe-B and Sm 2 Co 17 magnet at temperature of 523 K that the magnetic flux loss is increased at environment of high temperature.…”

Section: Resultssupporting

confidence: 85%

<I>γ</I>-Ray Irradiation on Microsized Nd-Fe-B and Sr-Ferrite Magnets at Low Temperature

Han

Gil²,

Kim³

et al. 2009

J. Nanosci. Nanotech.

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The gamma-ray irradiation on microsized Nd-Fe-B and Sr-Fe permanent magnet at low temperature and room temperature was investigated. The change of shape and magnetic properties of two kinds of magnet powder before and after irradiation at low temperature was measured. The crystal structure of each permanent magnet powders was analyzed using X-ray powder diffraction (XRD) and the size and shape were characterized by scanning electron microscope (SEM). The changed magnetic properties of magnet such as saturation magnetization (M(s)) and coercivity (H(c)) were measured by VSM.

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Section: Resultssupporting

confidence: 85%

<I>γ</I>-Ray Irradiation on Microsized Nd-Fe-B and Sr-Ferrite Magnets at Low Temperature

Han

Gil²,

Kim³

et al. 2009

J. Nanosci. Nanotech.

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“…The design of permanent magnet Quadrupoles is given in [7]. The EM design of PMQ took care of the operating temperature, thermal stability, stability against demagnetizing fields, and irradiation effects [10][11][12][13]. SmCo permanent magnets are used for realizing the PMQ along with pure iron poles.…”

Section: Magnetic Designmentioning

confidence: 99%

“…They are housed inside hermetically sealed copper Drift Tubes. Owing to their numerous advantages, Sm 2 Co 17 rare earth permanent magnets are used [7,[9][10][11][12], The DTL is post-coupled for increasing the stability of the E-field with respect to perturbations [8]. Slug tuners are used for one-time correction of static offset in resonant frequency arising due to fabrication deviations [13].…”

Section: Introductionmentioning

confidence: 99%

11–20 MeV Alvarez Drift Tube Linac for low energy proton accelerator

Teotia,

Malhotra,

Kumar

et al. 2023

J. Inst.

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Bhabha Atomic Research Centre is developing Low Energy High Intensity Proton Accelerator (LEHIPA) as a pre-injector for proposed Accelerator Driven Sub-Critical Reactor Systems (ADSS). Drift Tube Linac is one of the two major accelerating structures of LEHIPA, the other being the Radio Frequency Quadrupole (RFQ). Like all particle accelerating structures, DTL needs multi-disciplinary expertise for design, production, qualification, and installation. This paper describes the comprehensive design, production, qualification, and installation of the ∼ 11–20 MeV section of DTL. It details the design of all sub-components which form part of the DTL RF cavity. Several novel concepts were implemented in course of this development. Important among them are DT-DTL alignment, referencing methodology, robust vacuum design and hermetically sealed DTs. This paper is a comprehensive coverage of design, development and installation aspects of Alvarez DTL. At present, the DTL is ready for beam commissioning.

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“…By using SmCo permanent magnets with a remnant induction of 1.19 T, one can obtain a maximum magnetic field at the internal walls of ∼0.8 T, as confirmed by the magnetostatic simulation performed with ANSYS [19] and shown in figure 1(b). Although NdFeB magnets could achieve higher cusp fields due to their higher remnant induction, neutron irradiation experiments [20] show that NdFeB-type magnets have a much lower radiation tolerance than SmCo magnets and could not withstand the neutron flux predicted via a 3D Monte Carlo code for the DEMO NBI [21].…”

Section: Design Of a Beam-driven Plasma Neutralisermentioning

confidence: 99%

On suitable experiments for demonstrating the feasibility of the beam-driven plasma neutraliser for neutral beam injectors for fusion reactors

2022

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Plasma neutralisers promise increased neutralisation eﬃciency of negative ion beams in neutral beam injection (NBI) beamlines compared with gas neutralisers. It has been suggested that, in the presence of an electron-conﬁning magnetic cusp ﬁeld along all neutraliser walls, the beam itself could ionise the neutraliser gas suﬃciently to take advantage of this eﬀect, avoiding the added complexity of external power coupling to the neutraliser. These predictions come from a zero-dimensional model by Surrey and Holmes [1] and Turner and Holmes [2]. We have revisited and modiﬁed this model by introducing slowing-down energy distributions for stripped and Rudd electrons, including electron impact dissociation as an electron energy loss channel and taking into account dissociative recombination of molecular ions with electrons. Including the latter eﬀect reduces the predicted plasma density by about a factor of four and the achievable neutralisation yield from ∼ 80 % to 68 % in the case of a negative deuterium ion beam with an energy of 1 MeV and a current of 40 A. With this revised model we estimate the expected performance of potential beam-driven plasma neutralisers (BDPN) on a variety of existing negative ion beam test facilities for neutral beam injection. Based on these results, we conclude that the most suitable proof-of-principle experiment would be a dedicated chamber, ideally of the same dimensions and with the same magnetic cusp conﬁguration as a BDPN for the DEMO NBI, in which the plasma is not created primarily by the fast electrons stripped from the beam ions, but by electrons of similar current and energy emitted from biased ﬁlaments.

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The effect of neutron irradiation on Nd-Fe-B and Sm/sub 2/Co/sub 17/-based high-temperature magnets

Cited by 24 publications

References 15 publications

<I>γ</I>-Ray Irradiation on Microsized Nd-Fe-B and Sr-Ferrite Magnets at Low Temperature

<I>γ</I>-Ray Irradiation on Microsized Nd-Fe-B and Sr-Ferrite Magnets at Low Temperature

11–20 MeV Alvarez Drift Tube Linac for low energy proton accelerator

On suitable experiments for demonstrating the feasibility of the beam-driven plasma neutraliser for neutral beam injectors for fusion reactors

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