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Description
This work presents a practical dynamic focusing implementation to suppress noise-driven emittance transfer in the Electron–Ion Collider (EIC). The scheme is fully compatible with the existing interaction-region layout and does not require any modification of the IR geometry. It relies on sextupole windings on the final focusing quadrupoles, together with a dedicated matching section that compensates the geometric terms introduced by these windings. Although the resulting optics does not provide the ideal vertical phase advance of $\pi/2$, beam–beam simulations show that this non-ideal implementation effectively suppresses the vertical emittance growth driven through the resonance channel opened by the hourglass-modulated beam–beam kick. These results demonstrate that dynamic focusing can be feasibly incorporated into the current EIC design to improve integrated luminosity.
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