Longitudinal multibunch instabilities in the Advanced Photon Source storage ring

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A longitudinal coupled-bunch (CB) instability was encountered in the 7-GeV Advanced Photon Source (APS) positron storage ring whose threshold depends on the bunch fill pattern in a nontrivial way. The beam spectrum exhibited a coupled-bunch signature, which could be reproduced by an analytical model. The beam fluctuations were found to be correlated with the rf cavity temperatures, consistent with the measured temperature dependence of the higher-order mode (HOM) frequencies. Fast beam loss due to a multibunch effect was observed with other patterns of very long bunch trains. The nature of these instabilities has not yet been characterized. Multibunch instabilities had ... continued below

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8 p.

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Harkay, K.C.; Nassiri, A. & Kustom, R.L. October 1, 1997.

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A longitudinal coupled-bunch (CB) instability was encountered in the 7-GeV Advanced Photon Source (APS) positron storage ring whose threshold depends on the bunch fill pattern in a nontrivial way. The beam spectrum exhibited a coupled-bunch signature, which could be reproduced by an analytical model. The beam fluctuations were found to be correlated with the rf cavity temperatures, consistent with the measured temperature dependence of the higher-order mode (HOM) frequencies. Fast beam loss due to a multibunch effect was observed with other patterns of very long bunch trains. The nature of these instabilities has not yet been characterized. Multibunch instabilities had not been observed previously with electrons, although such patterns of long bunch trains were not studied systematically in this case.

Physical Description

8 p.

Notes

INIS; OSTI as DE98050335

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  • MBI `97: international workshop on multi-bunch instabilities in future electron and positron accelerators, Tsukuba (Japan), 15-18 Jul 1997

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  • Other: DE98050335
  • Report No.: ANL/ASD/CP--94766
  • Report No.: CONF-970792--
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 554878
  • Archival Resource Key: ark:/67531/metadc692924

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  • October 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Dec. 16, 2015, 12:53 p.m.

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Harkay, K.C.; Nassiri, A. & Kustom, R.L. Longitudinal multibunch instabilities in the Advanced Photon Source storage ring, article, October 1, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc692924/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.