Speaker
Description
At the China Spallation Neutron Source (CSNS), a novel laser delivery system using Anti-Resonant Hollow-Core Fiber (AR-HCF) has been developed to address the critical issue of positional jitter in laser-based H⁻ beam diagnostics. This system replaces conventional free-space optics, offering low-loss propagation, robust transverse mode quality, and strong resilience to environmental vibrations. Experimental results demonstrate a significant suppression of laser spot displacement at the interaction point. This improvement leads to beam profile measurements with higher signal-to-noise ratio and reproducibility, while also stabilizing the signals from LGAD-based H⁰ detectors for more reliable emittance analysis. The AR-HCF approach establishes a new foundation for high-stability, automated laser diagnostics in future large-scale accelerators.
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