Keyword: polarization
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TUPHA118 Correction of 10 Hz Orbit Distortion From Diamond's I10 Fast Switching Chicane ion, controls, electron, power-supply 682
  • M.J. Furseman, C.P. Bailey, S. Gayadeen, G. Rehm, W.A.H. Rogers
    DLS, Oxfordshire, United Kingdom
  The I10 beamline at Diamond Light Source is configured to study circular dichroism. To increase signal to noise ratio between the two beam polarisations and increase temporal resolution the beamline is fed by two separate IDs that are typically configured with opposite handed polarisations. A chicane of steering magnets with programmable power supplies is used to provide 10 Hz switching between the two photon beams by producing a dynamic closed bump that alternates the on-axis trajectory of the electron beam between the two IDs. In order to maintain the closed bump and make the switching transparent to the rest of the photon beamlines the phase and amplitude of the sine functions applied to the chicane magnets must be exactly correct. In this paper the linear scheme that was used to correct the residual 10 Hz orbit distortion is presented. Future work that uses the fully programmable nature of the magnet power supply controllers to correct high order distortions is also discussed.  
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