Space Charge 2026, 7th ICFA BD Mini-workshop

When Mismatch Is Inherent: Mismatch Partitioning Between H⁺ and H⁻ in Dual-Beam Transport with Strong Space Charge

30 Sept 2026, 16:47

3m

Denys Wilkinson Building, Dennis Sciama Lecture Theatre (Oxford University, Physics Department)

Poster Contributions (and Flash Talks) P

Speaker

Yinqi Ji (Institute of Modern Physics, Chinese Academy of Sciences)

Description

Dual-beam H⁺/H⁻ acceleration in a single linac boosts beam power and operational flexibility. However, downstream of the RFQ, the H⁺ and H⁻ phase space distributions cannot, in general, be simultaneously matched to the lattice. This inherent mismatch poses a severe challenge in the presence of strong space charge. We present a framework for dual-beam transport with inherent mismatch, using a proxy beam mismatched to both. Theoretical analysis of mismatch partitioning yields analytic criteria for proxy selection, providing practical guidelines for lattice design and beam tuning. Multiparticle simulations validate that this approach minimizes emittance growth and halo formation, enabling low-loss dual-beam transport in high-intensity linacs.