Speaker
Description
The KEK injector linac injects high-charge electron and positron beams
into the high-energy-ring and low-energy-ring of SuperKEKB
respectively. The linac also injects electron beams to the two light
source rings, PF ring andPF-AR. We operate simultaneous top-up
injections into the four rings by using many pulsed magnets. We have
been upgrading the linac to attain the higher-quality beam injections
for the SuperKEKB rings. In the summer of 2023, large-aperture
quadrupole pulsed magnets have been newly installed upstream of the
linac and driven by large-current pulse power supplies at markedly
high electric efficiency. These new magnets bring the pulse-by-pulse
optics changing to provide the high-quality beams. In order to cope
with the complex beam injections to the four rings, we have introduced
the automatic adjustment system by using machine-learning. The system
surpasses human skill in beam adjustment and has resulted in
significant increases in the amount of beam charge and beam
transmission.
We will report on the results of these upgrades.
