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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

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Shogo Sakanaka, Masaaki Izawa, Toshiyuki Mitsuhashi, and Takeshi Takahashi
Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba-shi, Ibaraki-ken, 305-0801 Japan

Received 28 February 2000; published 10 May 2000

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.

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© 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