Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2005, Vol. 16 ›› Issue (6): 321

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Methods of measurement for the beam-based alignment system in HLS

CAO Yong, SUN Bao-Gen, LU Ping   

  1. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029
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CAO Yong, SUN Bao-Gen, LU Ping. Methods of measurement for the beam-based alignment system in HLS.Nuclear Science and Techniques, 2005, 16(6): 321

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 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.

Key words: Beam-based alignment, BPM-to-quadrupole offset, Linear fitting, Parabola fitting, Local bump