Phys. Rev. ST Accel. Beams 6, 052801 (2003) [11 pages]Longitudinal quadrupole instability and control in the Frascati DAΦNE electron ring
A longitudinal quadrupole (q-pole) instability was limiting the maximum stable current in the DAΦNE e- ring at a level of ∼700–800 mA. In order to investigate the phenomenon, the instability threshold has been measured as a function of various machine parameters as radio frequency voltage (Vrf), momentum compaction (αc), number of bunches, fill pattern, etc. An unexpected interaction with the longitudinal feedback system, built to control the dipole motion, has been found and a proper feedback tuning has allowed increasing the threshold. The maximum stable beam current has now exceeded 1.80 A and it is no longer limited by the quadrupole instability. This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevSTAB.6.052801
DOI:
10.1103/PhysRevSTAB.6.052801
PACS:
29.27.Bd
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