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| Report/Contribution to a conference proceedings | PUBDB-2016-04330 |
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2001
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Please use a persistent id in citations: doi:10.3204/PUBDB-2016-04330
Report No.: DESY-M-01-06ZA; PAC-2001-WOPB003
Abstract: The lifetime of a light source with small emittance like the Advanced Light Source (ALS) is usually limited by the momentum acceptance of the ring. Large momentum acceptances are reached by providing enough RF voltage and by avoiding a degradation of the dynamic momentum aperture. At the ALS the size of the momentum acceptance depends strongly on the transverse dynamics. It is very sensitive to machine conditions such as the tunes and chromaticities since depending on those conditions the Touschek scattered particles explore different resonance regions in the phase space. In this paper we show that by using a single-turn ’pinger’ magnet together with turn-byturn beam position monitors (BPM) one can identify the cause of a reduction in momentum acceptance and take steps to improve the acceptance.
Keyword(s): talk: Chicago 2001/06/18 ; electron: storage ring ; synchrotron radiation: particle source ; beam: width ; momentum: width ; beam optics: chromaticity ; betatron oscillation: resonance ; bending magnet: superconductivity ; beam: multiple scattering ; Berkeley ES
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