Speaker
Description
BEPCII Linac operated with 20 power sources before the energy upgrade in summer 2024. To support sustained 2.35 GeV electron-positron collisions and maintain at least one redundant power source for operational reliability, the Linac required an energy increase. Among these, Power sources No. 6 (K6) and No. 12 (K12) exhibited relative lower energy contribution. Phase-matching misalignment between adjacent accelerating structures was identified as the most probable cause after checking the peak power gain of pulse compressors, the input power reflection of accelerating structures, and the total transmission loss. During the energy upgrade, the microwave phase at the input of K6’s accelerating structure was directly measured and adjusted—increasing K6’s net energy gain significantly. However, no corresponding work was carried out on K12 due to the recovery issues after vacuum destruction. As an engineering solution, one additional pulse compressor was installed at K4, and both K6 and K12 were upgraded from single-klystron to dual-klystron configurations. This strategy ensured stable, high-luminosity operation—directly enabling BEPCII to achieve its target luminosity in April 2026.
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