Title :
Methods of measurement for the beam-based alignment system in HLS
Author :
Cao, Yong ; Sun, Baogen ; Lu, Ping ; Li, Weimin ; He, Duohui ; Liu, Zuping ; Xu, Hongliang ; Wang, Junhua ; Zheng, Pu ; Li, Jihao ; Zhang, Chunhui
Author_Institution :
NSRL, Univ. of Sci. & Technol. of China, Hefei, China
Abstract :
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 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 above methods.
Keywords :
accelerator magnets; beam handling techniques; particle beam diagnostics; resistors; Hefei light source; beam position monitors; beam-based alignment system; linear fitting; magnet current; parabola fitting; quadrupole magnetic center; switchable shunt resistor; Control systems; Distortion measurement; Extraterrestrial measurements; High level synthesis; Light sources; Magnetic switching; Power supplies; Power system relaying; Resistors; Storage rings;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2004 IEEE
Conference_Location :
Rome
Print_ISBN :
0-7803-8700-7
Electronic_ISBN :
1082-3654
DOI :
10.1109/NSSMIC.2004.1462593
