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 injection.
This makes on-axis, off-phase, on-energy injection an at-
tractive option for future operation of the upgraded 3 GeV
storage ring, MAX 4U, where stronger focusing, reduced
magnet apertures, and narrow-gap undulators all limit the
transverse acceptance and challenge the present off-axis MIK
scheme. Additionally, the significantly reduced emittance
makes injected beam perturbations less transparent to the
beamlines. In this work, we investigate off-phase injection
for the technical design lattice candidate (TDR-1) 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 longitu-
dinal phase-space requirements of on-axis, off-phase, on-
energy injection. These results indicate that the combination
of a full energy linac, photo gun-based injector and off-phase
injection provide a promising path forward for injection into
a low-emittance storage ring at MAX IV
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