Speaker
Description
The China Spallation Neutron Source (CSNS) accelerator, consisting of a $\rm H^-$ linac and a rapid cycling synchrotron (RCS), is undergoing an upgrade to increase the average beam power to 500~kW. At the CSNS linac, shorted-stripline beam position monitor~(BPM) determines beam position by averaging over the entire macro-pulse. However, significant intra-macropulse beam position fluctuations have been observed in recent commissioning, which may cause undesired beam loss and degrade the injection efficiency. In this work, an intramacropulse beam position is reconstructed method based on the signal integral algorithm. During 2025 autumn and 2026 spring operation, the intra-macropulse beam position behaviors have been uncovered at the MEBT and LRBT sections. Although beam conditions vary between two different experiments, a significant beam position drift during the first~100~{$\mu$s}, with a maximum amplitude of more than 4 mm, has been revealed.
| Paper status | Resubmitted proceeding files received and assigned to an editor. Accepted by Submitter. |
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