منابع مشابه
Radiation-Induced Demagnetization of Nd-Fe-B Permanent Magnets
Introduction The Advanced Photon Source (APS), as well as other third-generation synchrotron light sources, uses permanent magnets in the insertion devices to produce x-rays for scientific research [1,2]. 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. Pr...
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This paper presents a spherical motor driven by electro-magnets that can rotate omnidirectionally with some degrees of rotation angle error independent of rotation direction. The spherical motor is composed of a spherical rotor, a semi-spherical stator, a control PC, a control circuit, and a DC power supply. The rotor has 92 neodymium magnets. On the other hand, 84 electro-magnets are arranged ...
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We discuss various aspects of electromagnetic quadrupole (EMQ) magnets for the LCLS FEL undulator, including their utility in beam-based alignment (BBA), magnet design issues, and impact on tunnel environment, reliability, and cost. The present focusing lattice in the LCLS undulator is based on permanent magnet quadrupoles (PMQs). The motivation for permanent magnets is under question, while va...
متن کاملDemagnetization Fields
Generaly in the study of magnetism, and specifically for micromagnetics simulations, one needs to know the magnetic field ~ HM inside a macroscopic magnet, that is caused by the magnetization ~ M (the dipole moment per unit volume) of that magnet itself. Some aspects of how that demagnetization field can be found are discussed. There are two basic cases: (1) The demagnetization field ~ HM insid...
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To demagnetize small-scale objects (dimensions less than 1 m) fabricated from ferromagnetic materials, it is standard practice to expose the object to a continuous ac applied magnetic field with a steadily decaying amplitude. For objects of dimensions greater than 10 m, there are problems of scale, and a stepwise procedure is preferred. We have simulated two different stepwise demagnetization t...
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ژورنال
عنوان ژورنال: American Journal of Science
سال: 1872
ISSN: 0002-9599
DOI: 10.2475/ajs.s3-3.17.346-a