Speaker
Description
NSRL recently proposed a future plan to further upgrade the HLS-II to an EUV diffraction-limited storage ring, named HLS-III. To mitigate collective effects, HLS-III will employ a bunch-lengthening harmonic cavity system. But such cavities can also introduce new beam instabilities. In this work, we perform particle-tracking simulations to systematically explore the key parameters ( R/Q and Q₀ ) of the harmonic cavities. We analyze the impact of different parameter combinations on beam stability and identify potential instability types. Based on this analysis, suitable ranges for R/Q and Q₀ are determined, which ensure adequate bunch lengthening while preserving acceptable beam dynamic stability. These findings provide valuable guidance for the design of the harmonic cavity system in HLS-III.
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