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This is not a true circle, but a 48-sided polygon with a bending magnet at each vertex and straight sections in between. The bending magnets are dipole magnets whose magnetic field deflects the electrons so as to steer them around the ring. As Diamond is a third generation light source it also uses special arrays of magnets called insertion devices. These cause the electrons to undulate and it is their sudden change of direction that causes the electrons to emit

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