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Multipole magnets are magnets built from multiple individual magnets, typically used to control beams of charged particles. Each type of magnet serves a particular purpose. * Dipole magnets are used to bend the trajectory of particles * Quadrupole magnets are used to focus particle beams * Sextupole magnets are used to correct for chromaticity introduced by quadrupole magnets 〔http://cas.web.cern.ch/cas/Bulgaria-2010/Talks-web/Brandt-1-web.pdf〕 ==Magnetic field equations== The magnetic field of an ideal multipole magnet in an accelerators is typically modeled as having no (or a constant) component parallel to the nominal beam direction ( direction) and the for the transverse components can be written as complex numbers:〔http://cas.web.cern.ch/cas/Belgium-2009/Lectures/PDFs/Wolski-1.pdf〕 where and are the coordinates in the plane transverse to the nominal beam direction. is a complex number specifying the orientation and strength of the magnetic field. and are the components of the magnetic field in the corresponding directions. Fields with a real are called 'normal' while fields with purely imaginary are called 'skewed'. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Multipole magnet」の詳細全文を読む スポンサード リンク
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