Slow extraction of beams from synchrotrons or storage rings as required by many fixed target experiments is performed by controlled excitation and feeding of a structural lattice resonance. Due to the sensitive nature of this resonant extraction process, the temporal structure of the extracted beam is modulated by the minuscule current fluctuations present on the quadrupole magnet power supplies. Such a modulation leads to pile-up in detectors and significant reduction in accumulated event statistics. This contribution proposes and experimentally demonstrates that by introduction of a further modulation on quadrupole currents with a specific amplitude and frequency, the influence of inherent power supply fluctuations on spill is mitigated. The slow-extraction beam dynamics associated with this method are explained along with the operational results.

• Received 29 July 2019
• Revised 19 February 2020
• Accepted 31 March 2020

DOI:https://doi.org/10.1103/PhysRevApplied.13.044076