Measurement and correction of coupling in BEPCⅡ

ZHANG Yuan; YU Cheng-Hui; JI Da-Heng; XU Gang; WEI Yuan-Yuan; QIN Qing

doi:10.1088/1674-1137/35/12/012

Chinese Physics C> 2011, Vol. 35> Issue(12) : 1143-1147 DOI: 10.1088/1674-1137/35/12/012

Measurement and correction of coupling in BEPCⅡ

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Abstract：
The existing linear coupling theory and representation method are introduced briefly. The so-called local and global coupling is discussed in more detail. The vertical orbit distortion excited by a horizontal corrector is represented with the coupling parameters at the corrector and the observation point. The formula is used to measure the coupling in BEPCⅡ. In order to correct the coupling, vertical correctors are used to change the vertical orbit through sextupoles by a least square method. We also introduce and review other frequently used coupling measurement/tuning methods used in our machine.

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ZHANG Yuan, YU Cheng-Hui, JI Da-Heng, XU Gang, WEI Yuan-Yuan and QIN Qing. Measurement and correction of coupling in BEPCⅡ[J]. Chinese Physics C, 2011, 35(12): 1143-1147. doi: 10.1088/1674-1137/35/12/012

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Received: 2011-02-24
Revised: 2011-05-03

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