Barrier bucket and transversely split beams for loss-free multi-turn extraction in synchrotrons

M Vadai,H Damerau,A Alomainy,A Huschauer,M Giovannozzi,S Gilardoni

doi:10.1209/0295-5075/128/14002

Abstract

A special radio-frequency manipulation has been studied and successfully implemented at the CERN Proton Synchrotron for the first time. This technique aims at depleting a well-defined fraction of a continuous longitudinal beam distribution by creating a so-called barrier bucket. In addition to the intrinsic interest for its originality, this approach has an immediate application at CERN in combination with the Multi-Turn Extraction scheme. The combination of these two exotic techniques into a single, highly sophisticated process allows to dramatically reduce the beam loss at PS extraction, thus opening the door to the production of high-intensity proton beams for future fixed-target experiments at the CERN Super Proton Synchrotron.

Highlights

A special radio-frequency manipulation has been studied and successfully implemented at the CERN Proton Synchrotron for the first time
Introduction. – Since the introduction of the MultiTurn Extraction (MTE) as an operational beam manipulation in the CERN Proton Synchrotron (PS), the losses of high-intensity proton beams delivered to the fixed-target physics facilities at the CERN Super Proton Synchrotron (SPS) have been greatly reduced [1–5] with respect to the previously applied Continuous Transfer (CT) extraction method [6,7]
MTE is a technique based on beam splitting in the transverse horizontal plane by means of trapping particles into stable resonance islands generated by non-linear magnetic fields, such as sextupoles and octupoles [1,8,9]

Summary

Introduction

A special radio-frequency manipulation has been studied and successfully implemented at the CERN Proton Synchrotron for the first time. The most efficient approach to further reduce the extraction losses is to create a gap in the longitudinal beam distribution, which has to be synchronised with the rise time of the kicker magnets.

Results

Conclusion