The Magnetic Center Alignment Based on FECR Superconducting Ion-Source Magnet After Cryostat Installation

IMP (Institute of Modern Physics, Chinese Academy of Science) developed the FECR (Fourth Generation ECR Ion-Source) superconducting magnet, which is made up of a sextupole magnet and four solenoid magnets. These component magnets are required to be installed and aligned on the same mechanical axis. After loading the ion-source magnet into the cryostat, we set up an adjustment device to rectify the location. For the alignment of two types of coils, two separate measurement methods are used. The rotating coil is used to measure sextupole offset, while the rotating Hall sensor is used to measure solenoid offset. Both measurement probes are mechanically connected to the cryostat's warm bore. The position of the magnet constitution will be adjusted several times until the magnetic axis of the FECR magnet and the mechanical axis of the cryostat warm bore coincides to a satisfactory degree.