Effect of Vacuum Chamber Eddy Current and Compensation by Digital Feedback
نویسنده
چکیده
Measurement of the effect of the eddy current induced in the APS storage ring vacuum chamber by the storage ring sextupole magnet and its compensation using digital feedback with proportional, integral, and derivative (PID) control algorithm are presented. The magnetic field in the vacuum chamber shows strong quadrupole and sextupole components varying with frequency, in addition to significant attenuation and phase shift. Large changes in the magnet resistance and inductance were also observed. Development of a theory of digital feedback to obtain system responses and the conditions for optimal control will be described, in conjuction with design of a digital filter to compensate for the eddy current effect.
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تاریخ انتشار 1992