Resonance Frequency Feedback System for a Precise Magnet Alignment using Multi-vibrating Wires

Abstract

Magnet alignment is one of most critical issues for realizing next generation light source. A vibrating wire method has been regarded as the promising scheme, however, environment changes, especially temperature drift causes not only the drift of a magnetic center, but also the drift of a resonance frequency of the wire. These drifts are all mixed in a signal of wire vibration, and not separable for an ordinary method. We have developed a frequency feedback system for the vibrating wire method. A magnetic center can stably be measured using the system, and the resolution of the measurement was better than 1 [µm] for a typical quadrupole magnet. A possibility to apply it for future light source have been discussed.