Phys. Rev. ST Accel. Beams 3, 050701 (2000) [14 pages]Improvement in the beam lifetime by means of an rf phase modulation at the KEK Photon Factory storage ring
In the 2.5-GeV Photon Factory storage ring at KEK, we have found that the beam lifetime can be improved by modulating the phase of an rf accelerating voltage at a frequency of 2 times the synchrotron oscillation frequency. By applying this phase modulation with a peak-to-peak amplitude of 3.2°, the beam lifetime could be improved, typically, from 22 to 36 h under a beam current of about 360 mA. At the same time, the longitudinal coupled-bunch instability could be considerably suppressed. The improvement in the beam lifetime can be explained as an improved Touschek lifetime, which was caused by a quadrupole-mode longitudinal oscillation of the stored bunches. 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. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevSTAB.3.050701
DOI:
10.1103/PhysRevSTAB.3.050701
PACS:
29.20.Dh, 29.27.Bd
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