Study of Ion-induced Instabilities and Transverse Feedback Performance at SOLEIL

The high beam current operation at SOLEIL is considered to be seriously influenced, under certain conditions, by ions exciting transverse instability. Its mechanism involving the RF voltage, beam filling and transverse bunch by bunch feedback however appears to be complicated raising several unanswered questions. The present paper reports on the experimental observations and analysis, as well as tracking simulations carried out in order to find clues to the problems.