摘要
The beam-based alignment system is given in HLS (Hefei Light Source), in which a switchable shunt resistorwas installed on quadrupole to bypass a small percentage of the magnet current. The system can measureBPM-to-quadrupole offset which can be used to position the beam in the magnetic center of quadrupoles. In measurement,some methods ( linear fitting with single corrector, parabola fitting with single corrector, linear fitting withlocal bump, and parabola fitting with local bump ) are used. These measurement results are given, and comparedamong the methods mentioned above.
The beam-based alignment system is given in HLS （Hefei Light Source）, in which a switchable shunt resistor was installed on quadrupole to bypass a small percentage of the magnet current. The system can measure BPM-to-quadrupole offset which can be used to position the beam in the magnetic center of quadrupoles. In measurement, some methods （ linear fitting with single corrector, parabola fitting with single corrector, linear fitting with local bump, and parabola fitting with local bump ） are used. These measurement results are given, and compared among the methods mentioned above.
基金
SupportedbyNationalNaturalScienceFoundationofChina(10275062)
关键词
高能加速器
HLS
BPM
四极
轨迹监测
Beam-based alignment, BPM-to-quadrupole offset, Linear fitting, Parabola fitting, Local bump
