THP083 　ポスター②　 8月1日 3Fホワイエ 13:00-15:00

PF-HLSリングの挿入光源用真空ダクトのインピーダンス評価

Impedance evaluation of vacuum duct for insertion device of PF-HLS ring

○田中 織雅，中村 典雄（高エネルギー加速器研究機構）

○Olga Tanaka, Norio Nakamura (High Energy Accelerator Research Organization (KEK))

Accurately estimating the stability threshold currents in the PF-HLS ring (HLS: Hybrid Light Source) requires a reliable model of its impedance. long insertion sections, particularly those containing 5m and 10m undulators, are identified as major contributors. To address this, extensive calculations of the impedance and wakefields generated by the vacuum vessel components have been performed using the CST Studio Suite electromagnetic simulator. The results are summarized for each undulator its imaginary part of the longitudinal impedance at low frequency divided by the revolution frequency Im(Z||/n)0, the vertical transverse kick factor of the geometrical impedance (κy), the wake loss factor (k||), and the vertical kick factor of the resistive-wall impedance (ky r.w.). This analysis plays a crucial role in understanding beam stability and optimizing performance within the PF-HLS ring.