HB2025 - the 71st ICFA Advanced Beam Dynamics workshop on High-Intensity and High-Brightness Hadron Beams

Design considerations of the bunch-by-bunch transverse feedback system for the CSNS RCS

THPT16

Oct 23, 2025, 3:30 PM

2h

third floor (conference center)

Poster Presentation WGE: Beam Instrumentation, beam Interaction and AI technology THPT poster session

Speaker

Weiwen Chen (Institute of High Energy Physics)

Description

The CSNS RCS (Rapid Cycling Synchrotron) is a proton accelerator designed to achieve a target beam energy of 1.6 GeV, with a typical operating intensity of 170 kW, which is expected to be 500 kW with the CSNS-II upgrade. However, a significant beam instability has been observed in the RCS during the early 100 kW beam commissioning. To mitigate this instability, several countermeasures, for instance the optimization of the tunes, the dual-harmonic magnetic alloy cavity, and tuning of the chromaticity, has been implemented. To leave sufficient margin for the high-current operation and damp the beam oscillation associated with the beam instabilities, a bunch-by-bunch transverse feedback system is under development. The current initial design is based on the existing pickup, exciting kicker, and the MTCA.4 platform with the potential upgrade to an intra-bunch feedback system.