Orbit Fluctuation of Electron Beam due to Vibration of Vacuum Chamber in Quadrupole Magnets

概要

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The fluctuation spectrum of the electron beam orbit in the SPring-8 storage ring had broad peaks at approximately 40 Hz vertically and from 80 to 100 Hz horizontally. Fourier analysis of orbit fluctuation identified these fluctuation sources not as magnet vibration but as chamber one due to the disturbance of the cooling water. When the chamber vibration was reduced by fixing the chamber rigidly, the orbit fluctuation was reduced in the same way. An eddy current induced in the vibrating thick chamber in quadrupole magnets produces a bending field, which kicks the electron beam. This field is equivalent to the vibration field of a quadrupole magnet with the same vibration amplitude. The calculated orbit fluctuation based on this model agrees with the measured one.
INSTITUTE OF PURE AND APPLIED PHYSICSの論文
2003-03-15