Experimental Results on Low Alpha Electron-Storage Rings

1 January 1996

proceedings article
Published by AIP Publishing in AIP Conference Proceedings

Vol. 367 (1) , 150-164
https://doi.org/10.1063/1.50301

Abstract

We report on experiments performed in two synchrotron light sources, UVSOR and Super‐ACO, where the momentum compaction factor is reduced in order to reduce the bunch length. By controlling the second‐order momentum compaction factor, UVSOR and Super‐ACO have managed to reduce the first‐order momentum compaction factor by a a factor of 100. At low current the resulting bunch lengths are less than 10 ps, a factor of 10 smaller than normal. Measurements of current‐dependent bunch lengthening in UVSOR are presented, and the cause of the bunch lengthening is determined to be potential‐well distortion. We also show that by operating with a negative momentum compaction factor, Super‐ACO has achieved shorter bunch lengthening and higher peak currents than at positive momentum compaction.

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