Speaker
Description
The MAX IV injector, including a full energy linac and a photo gun, offers a unique capability to deliver low-emittance, well-timed electron pulses suitable for off phase, on-axis longitudinal injection. This makes longitudinal injection an attractive option for future operation of the upgraded 3 GeV storage ring, MAX4U, where stronger focusing, reduced magnet apertures, and narrow-gap undulators all limit the transverse acceptance and challenge the present off-axis MIK scheme.
In this work, we investigate longitudinal injection for several MAX4U lattice candidates and show through simulations that stable capture is achievable despite the reduced dynamic aperture. We also evaluate how the characteristics of the photo gun beam support the longitudinal phase-space requirements of off-phase, on-axis injection.
These results indicate that the combination of a full energy linac, photo gun-based injector and longitudinal injection provide a promising path forward for injection into a low-emittance storage ring at MAX IV.
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