First Observations of a “Fast Beam-Ion Instability”
- 7 July 1997
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 79 (1) , 79-82
- https://doi.org/10.1103/physrevlett.79.79
Abstract
We report the results of observations of a new regime of ion instabilities at the Advanced Light Source (ALS). With artificially increased pressure and gaps in the bunch train large enough to avoid multiturn ion trapping, we observed a factor of 2–3 increase in the vertical beam size along with coherent beam oscillations which increased along the bunch train. The observations are qualitatively consistent with the “fast beam-ion instability” [T. O. Raubenheimer and F. Zimmermann, Phys. Rev. E 52, 5487 (1995); G. V. Stupakov et al., Phys. Rev. E 52, 5499 (1995)], which can arise even when the ions are not trapped over multiple beam passages. This effect may be important for many future accelerators.Keywords
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