Improvement on a Michelson interferometer for bunch length measurement of a femtosecond accelerator

SYNCHROTRON SCIENCE AND TECHNOLOGY

Improvement on a Michelson interferometer for bunch length measurement of a femtosecond accelerator

LIN Xuling，

ZHANG Jianbing，

BEI Hua，

DAI Zhimin

Nuclear Science and Techniques

Vol.20, No.1

pp.1-4

Published in print 20 Feb 2009

DOI：10.13538/j.1001-8042/nst.20.1-4

68901

Based on the femtosecond accelerator facility at Shanghai Institute of Applied Physics (SINAP), a conventional far-infrared Michelson interferometer was built to measure the bunch length by means of optical autocorrelation. However, according to the preliminary experiment result, the resolution of interferometer is not good enough, because the mirror-driving mechanism makes the moving mirror tend to tilt or wobble as it retards. Considering of the allowable errors, we calculate the maximum allowable titling angle of the moving mirror, and discuss the alignment plan in this paper.

Coherent transition radiationBunch lengthInterferometerDynamic alignment

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