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Measurement and Research of Beam-Based Alignment With AC k-Modulation at HLS

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3 Author(s)
Yong Cao ; Nat. Synchrotron Radiat. Lab., Univ. of Sci. & Technol. of China, Anhui ; Bao-gen Sun ; Duo-hui He

A new beam-based alignment (BBA) measurement system with AC k-modulation module was developed recently at Hefei Light Source (HLS), which equipped the quadrupole magnets on the storage ring with a current shunt system which was able to vary the magnet current of a given quadrupole at a given frequency. The corresponding closed orbit oscillation amplitude measured for different beam positions in the quadrupole reached a minimum when the beam was centered in the quadrupole. Amplitude estimation algorithms of software lock-in amplifier and interpolated FFT were discussed. A V-shaped curve was used to determine the offset; a method using a parabola fit to determine the offset was also discussed. This BPM-to-quadrupole offset was determined at HLS with an accuracy of ~50 mum. The reproducibility of the beam based alignment using this technique is about 20 mum (RMS)

Published in:

Nuclear Science, IEEE Transactions on  (Volume:54 ,  Issue: 2 )

Date of Publication:

April 2007

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