Rotating Coil System for PLS-II Magnets

Abstract

The Pohang Accelerator Laboratory (PAL) has been carrying out an upgrade project on the Pohang Light Source (PLS) to PLS-II. The overall lattice of the storage ring for PLS-II has been changed; thus, many magnets installed in the storage ring at present must be replaced with new or modified ones. The magnetic field qualities of quadrupole and sextupole magnets will be measured using new rotating coils that were fabricated using an engineering ceramic bar for the first time at the PAL. The data acquisition system for the field measurements has been rebuilt to make it simple and to have a good signal-to- noise ratio. In this presentation, the design parameters of the rotating coil are given. Various characteristics of the field measurement system and test results are also presented.