Design of Beam Position Monitor of Wuhan Photon Source

Wuhan Photon Source (WHPS), as a fourth-generation synchronous light source, imposes stringent requirements on the resolution and longitudinal coupling impedance of the Beam Position Monitor (BPM). To address the need for beam current monitoring in its 1.5 GeV diffraction-limited storage ring, an optimized design scheme for button BPM is proposed. Additionally, the structure of the BPM feedthrough is enhanced, and a detailed investiga-tion into the impact of various materials on the longitudi-nal coupling impedance of the BPM is conducted. These findings serve as a valuable reference for the future de-sign of similar BPM systems.