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

Impedance of ceramic chambers and its impact on beam stability

WEICB04

Oct 22, 2025, 3:30 PM

30m

Room B (Conference center)

Invited Oral Presentation WGA:Beam Dynamics in Rings WEICB WGA invited oral

Speaker

Liangsheng Huang (Institute of High Energy Physics)

Description

The China Spallation Neutron Source (CSNS) utilizes ceramic vacuum chambers in the high-dynamic-field regions of the Rapid Cycling Synchrotron (RCS) to preserve the vacuum environment of beam. Previous theoretical studies suggested that the impedance of this structure could be neglected concerning its impact on the beam. Recent measurements, however, have detected low-frequency resonant impedance in a ceramic vacuum chamber within the RCS, which further investigations have confirmed as the source of transverse coupled-bunch instability in the RCS. This report details the determination of ceramic chamber impedance and its contribution to transverse coupled-bunch instability, as well as the impedance reduction technologies developed to meet the high-power requirements of the RCS.