RF noise driven dipole mode parametric resonance

Kim, Yujong; Kim, C.; Kim, K.H.; Yu, I.H.; Yang, Jun; Chun, M.H.; Kwon, M.; Huang, Jung Yun; Nam, Seunggoo; Cho, M.H.; Namkung, W.; Ko, In Soo

doi:10.1109/pac.2001.987240

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

DOI: 10.1109/pac.2001.987240

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RF noise driven dipole mode parametric resonance

Yujong Kim

C. Kim²,

K.H. Kim³

et al.

Abstract: In the Pohang Light Source (PLS) storage ring, we have occasionally experienced the abnormal spontaneous beam lifetime reduction and strong longitudinal damping. Due to the abnormal beam lifetime reduction, available beam time is reduced substantially. From the recent data analysis of the PLS longitudinal feedback system (LFS) and the streak camera, we have found that the abnormal phenomena can be generated by the RF noise via the dipole mode parametric resonance of the RF phase modulation. We describe the obs… Show more

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Fast beam-ion instability driven longitudinal damping

Kim

Kim²,

Kim³

et al.

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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In the Pohang Light Source storage ring, we empty 68 buckets of total 468 buckets to cure the conventional ion trapping. However, the fast beam-ion instability is occasionally generated at higher beam current. Immediately after the strong vertical beam shaking due to the fast beamion instability, the longitudinal coupled bunch mode instabilities are substantially damped down without any active feedback system. We have described the fast beam-ion instability driven longitudinal damping and its mechanism in the Pohang Light Source storage ring.

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Fast beam-ion instability driven longitudinal damping

Kim

Kim²,

Kim³

et al.

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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Bunch length beating in PLS storage ring

Kim

Kim²,

Kim³

et al.

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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During the normal operation period in the Pohang Light Source (PLS) storage ring, the spontaneous bunch length oscillation or beating is generated by the nonlinear effects of the RF noise whose frequency is much lower than the bifurcation frequency. Due to the bunch length beating, we can not supply the uniform intensity beams to users. We have described the observed bunch length beating and its mechanism in the PLS storage ring with a simulation.

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RF noise driven dipole mode parametric resonance

Cited by 2 publications

References 4 publications

Fast beam-ion instability driven longitudinal damping

Fast beam-ion instability driven longitudinal damping

Bunch length beating in PLS storage ring

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