Adaptive feedforward control of closed orbit distortion caused by fast helicity-switching undulators.A new correction algorithm for closed orbit distortion based on an adaptive feedforward control (AFC) has been developed.  The developed AFC system has been applied to the THUs dynamically updating the feedforward table without stopping the helicity switching amid user experiments.  The actual operation of the new AFC system enables us to keep the orbit variations suppressed with an accuracy at the sub-micrometre level in a transparent way for light source users.
AFC
Adaptive feedforward control of closed orbit distortion caused by fast helicity-switching undulators.A new correction algorithm for closed orbit distortion based on an adaptive feedforward control (AFC) has been developed.  The developed AFC system has been applied to the THUs dynamically updating the feedforward table without stopping the helicity switching amid user experiments.  The actual operation of the new AFC system enables us to keep the orbit variations suppressed with an accuracy at the sub-micrometre level in a transparent way for light source users.
AFC