Open AccessRotating/Helmholtz coil system using a lock‐in amplifier method
Author(s) -
Tanabe T.,
Kitamura H.
Publication year - 1998
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s090904959701371x
Subject(s) - amplifier , electromagnetic coil , multipole expansion , helmholtz coil , helmholtz free energy , integrator , magnet , physics , lock (firearm) , nuclear magnetic resonance , electrical engineering , computer science , engineering , mechanical engineering , voltage , cmos , quantum mechanics
Measurement of integrated magnetic induction is an important part of the construction of insertion devices. The so‐called `flipping coil system' is normally utilized to characterize the integrated multipole components of the device, a requirement which varies from one storage ring to another. A Helmholtz coil system is used to determine a magnetization vector of each magnet piece in the device. Both systems are designed to measure the integrated magnetic flux to deduce the necessary quantities using the known relationship. We have developed an unconventional system which has a continuously rotating mechanism that allows the use of a lock‐in amplifier instead of an integrator or a voltmeter. Detailed descriptions of the equipment are given.