Recent Observations on a Horizontal Instability in the DAFNE Positron Ring

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A strong horizontal instability limits the maximum positron current storable in the DAFNE Phi-Factory. A powerful feedback system makes it possible to store and put in collision more than 1300 mA of positron current in 105-109 bunches. Nevertheless, a much higher current (>2.4A) has been successfully stored in the twin electron ring. Measurements have been carried out to understand the positron current limit and to characterize the behavior of the horizontal instability at high current with different bunch patterns. Grow/damp turn-by-turn data obtained by turning off the horizontal feedback have been acquired and analyzed. Spectral analysis and growth rates of ... continued below

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3 pages

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Drago, A.; Zobov, M.; /Frascati; Teytelman, D. & /SLAC January 20, 2006.

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A strong horizontal instability limits the maximum positron current storable in the DAFNE Phi-Factory. A powerful feedback system makes it possible to store and put in collision more than 1300 mA of positron current in 105-109 bunches. Nevertheless, a much higher current (>2.4A) has been successfully stored in the twin electron ring. Measurements have been carried out to understand the positron current limit and to characterize the behavior of the horizontal instability at high current with different bunch patterns. Grow/damp turn-by-turn data obtained by turning off the horizontal feedback have been acquired and analyzed. Spectral analysis and growth rates of the instability are shown. In particular, the -1 mode has strong evidence and fast growth rate. Its growth rate behavior is analyzed at different beam currents and bunch patterns.

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3 pages

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  • Prepared for Particle Accelerator Conference (PAC 05), Knoxville, Tennessee, 16-20 May 2005

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  • Report No.: SLAC-PUB-11654
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 878021
  • Archival Resource Key: ark:/67531/metadc879565

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  • January 20, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 9, 2016, 8:23 p.m.

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Drago, A.; Zobov, M.; /Frascati; Teytelman, D. & /SLAC. Recent Observations on a Horizontal Instability in the DAFNE Positron Ring, article, January 20, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc879565/: accessed June 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.