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

SYNCHROTRON TECHNOLOGY AND APPLICATIONS

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

CAO Yong，

SUN Bao-Gen，

LU Ping

Nuclear Science and Techniques

Vol.16, No.6

pp.321-324

Published in print 01 Dec 2005

CLC：O572.21+1

19701

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.

Beam-based alignmentBPM-to-quadrupole offsetLinear fittingParabola fittingLocal bump

References

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