A perturbation method reduces multibunch instabilities in RF cavities, suggesting improved design for high current storage rings.
The cure of multibunch instabilities is of utmost importance for the next generation of very high current storage rings. The parasitic modes of the RF cavities are chiefly responsible of these instabilities. A perturbation method is proposed to decouple the cavity parasitic modes from the bunch relative oscillation sidebands, without affecting the fundamental mode. Signal level measurements on a test pill-box cavity give encouraging results.
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S. et al. (1991) studied this question.
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