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Description
The High Energy Photon Source (HEPS) booster synchrotron accelerates electron bunch from the linac output energy of 500 MeV to 6 GeV for storage ring injection. For the purpose to enable a klystron hot-standby configuration for the linac, improving its operational reliability and reducing power consumption, while also meeting the design requirement of at least 5 nC per bunch, this study investigates the feasibility of high-charge, low-energy injection into the booster ring under the condition that the beam energy from the linac is reduced to 300 MeV. Energy ramping simulations for the HEPS booster were conducted using elegant, tracking two distinct bunch types respectively: a Gaussian-distributed bunch and a bunch with more realistic distributions generated by simulations incorporating errors and corrections in the linac and the low-energy transport line. Simulations and analysis indicate that, with a suitable initial RF voltage, transverse mode-coupling instability (TMCI) is the key factor limiting high-charge bunch transmission efficiency. By optimizing the chromaticity to enhance Landau damping, TMCI can be effectively suppressed, significantly improving transmission efficiency. A further reduction in the injected bunch energy spread leads to additional gains in transmission. Through this synergistic optimization of multiple parameters, it looks feasible to achieve stable transport of beam with bunch charge exceeding 5 nC over the extended energy range of the booster.
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