Speaker
Description
In upgrading the present SOLEIL ring, it has been decided to introduce longitudinal bunch-by-bunch feedback (LFB) in addition to the already existing transverse feedback (TFB), because studies indicate that the new normal conducting fundamental RF cavities may excite longitudinal coupled-bunch instabilities (LCBI) due to their higher-order-modes (HOMs). SOLEIL II also plans to use bunch-lengthening harmonic cavities (HCs) to improve the Touschek lifetime, which may trigger complex LCBIs. The present study aims to develop an LFB system responsible for the longitudinal collective stability of the SOLEIL II beam. The theoretical calculation of the instability growth rate of the HOMs has been carried out, defining the preliminary performance requirements of the LFB. Among the three main parts of the system-detection, signal processing and kicking- the present work focuses on the development of the processing section and the paper also presents some design aspects of the kicker cavity along with a beam-based test converting the currently operating TFB system to LFB by utilizing the stripline as a longitudinal kicker.
| Paper status | Resubmitted proceeding files received and assigned to an editor. Accepted by Submitter. |
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