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Description
The Beijing Electron Positron Collider II (BEPCII) is a key large scientific installation for high-energy physics research in China, with its linear accelerator (Linac) serving as the core injector system responsible for generating and accelerating high-quality electron/positron beams to the designed energy for collider operation. Recently, this linac has been updated to serve as a high-performance electron injector for the Plasma Wakefield Acceleration (PWFA) experiment. This paper presents a complete set of beam commissioning, optimization, and performance validation for the BEPCII Linac to meet the strict beam requirements of PWFA. The commissioning focuses on beam energy stability, orbit quality, emittance control, and timing synchronization, aiming to provide a high-stability, low-emittance electron beam for PWFA-driven acceleration. Through orbit correction, RF parameter tuning, magnet system calibration, optics matching, and pulse stability optimization, the BEPCII Linac achieves excellent beam performance: energy stability better than ±0.1%, beam orbit fluctuation below 0.5 mm and normalized emittance below 0.4 mm·mrad.
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