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TY - CONF AU - Fukami, K. AU - Azumi, N. AU - Fujita, T. AU - Honiden, T. AU - Kajimoto, K. AU - Kimura, H. AU - Matsui, S. AU - Nakanishi, T. AU - Okayasu, Y. AU - Watanabe, T. AU - Zhang, C. ED - Petit-Jean-Genaz, Christine ED - Arduini, Gianluigi ED - Michel, Peter ED - Schaa, Volker RW TI - Resonance Frequency Feedback System for a Precise Magnet Alignment using Multi-vibrating Wires J2 - Proc. of IPAC2014, Dresden, Germany, June 15-20, 2014 C1 - Dresden, Germany T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - An ultimate storage ring (USR) is being designed at synchrotron radiation facilities in the world. USR can generate theoretically minimum synchrotron radiation because emittance of the USR is less than diffraction limit of the radiation. The USR requires high alignment precision of micro-meter order. A vibrating wire method (VWM) has widely been used for such a high precision alignment. An error field of multi-pole magnet is estimated by detecting a vibration of a single wire excited with AC current. The wire position, where no vibration is excited, is defined as the magnetic center. The applied frequency is kept on a resonant frequency, which may drift due to temperature change etc. during the measurement. To trace the resonant frequency at all times, we developed a frequency feedback system. It is necessary to trace the resonance, even when the wire is set in the vicinity of the magnetic center where the magnetic field is nearly zero. Here we propose to install one or two additional wires parallel to the original wire. The additional wires off the center can detect the vibration frequency with enough S/N ratio. We discuss the effectiveness of it for quick and reliable alignment. PB - JACoW CP - Geneva, Switzerland SP - 277 EP - 279 KW - feedback KW - resonance KW - quadrupole KW - alignment KW - emittance DA - 2014/07 PY - 2014 SN - 978-3-95450-132-8 DO - 10.18429/JACoW-IPAC2014-MOPRO081 UR - http://jacow.org/ipac2014/papers/mopro081.pdf ER -