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Simultaneous acceleration of positive and negative ions ($H^+$ and $H^-$) in a Multi-Beam RFQ is a promising approach for high-intensity linear accelerators. This study presents the design and beam dynamics analysis of a 100 mA dual-beam RFQ, building upon a robust single-beam periodic FODO lattice to ensure initial transverse matching and beam stability. Dual-beam simulations utilizing custom data processing pipelines reveal that longitudinal space-charge interactions degrade the longitudinal potential well. This degradation induces a "trapping" phenomenon, where ions escape their designated buckets, limiting the initial dual-beam transmission efficiency to 80%.
To mitigate this, a transverse-longitudinal coupled optimization was conducted. By increasing the modulation factor by 0.03 in the Shaper section, the longitudinal bunching force was enhanced to suppress trapping. Despite the intensified RF defocusing, the previously optimized transverse envelope maintained robust beam stability. This targeted optimization successfully improved the overall dual-beam transmission efficiency to 89.4%, providing a practical reference for high-current Multi-Beam RFQ designs.
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