Using a pre-kicker to ensure safe extractions from the HEPS storage ring

Abstract The High Energy Photon Source (HEPS) is a 6 GeV diffraction-limited storage ring light source under construction. swap-out injection adopted with the depleted bunch recycled via high-energy accumulation in booster. extremely high beam energy density of bunches an ultra-low emittance (about 30 pm horizontally and 3 vertically) charges (from 1.33 to 14.4 nC) extracted from could cause hazardous damage extraction Lambertson magnet case kicker failure. To this end, we proposed use pre-kicker spoil prior extraction, significantly reducing maximum down within safe region while still maintaining highly efficient extractions. main parameters are simulated discussed.