Photon sources and instrumentation S. Dastan1, D. Zhou2,3, T. Ishibashi2,3, E. Karantzoulis1, S. Di Mitri1, R. Lindberg4 1 Elettra - Sincrotrone Trieste S.C.p.A., Trieste, Italy 2 KEK, High Energy Accelerator Research Organization, Tsukuba, Japan 3 SOKENDAI, The Graduate University for Advanced Studies, Hayama, Japan 4 Argonne National Laboratory, Argonne, USA e-mail: dmzhou@post.kek.jp; sara.dastan@elettra.eu Acknowledgments We acknowledge Elettra Sincrotrone Trieste and the High Energy Accelerator Research Organization (KEK) for their support and for providing access to data. Original paper S. Dastan et al., Phys. Rev. Accel. Beams 27, 104401 (2024); DOI:10.1103/ PhysRevAccelBeams.27.104401. Figure 2. Same analysis as Fig. 1, with the 3HC active. The 3HC increases the instability threshold and reduces bunch lengthening and energy spread at higher currents. Figure 1. Normalized bunch length and energy spread as a function of bunch current for Elettra 2.0. Simulations were done using Elegant with different combinations of the impedance models. The bunch is with 106 multi-particles and tracking is done for five times of longitudinal damping time. This result is without 3HC effect. 1 1.5 2 2.5 3 3.5 4 0 1 2 3 4 5 6 7 8 9 10 σz/σz0 I (mA) CSRZ+3HC CSRZ+RW+3HC CSRZ+RW+BBR+3HC RW+BBR+3HC BBR+3HC 0 0.5 1 1.5 2 2.5 3 3.5 4 0 1 2 3 4 5 6 7 8 9 10 σz/σz0 I (mA) CSRZ CSRZ+RW CSRZ+RW+BBR RW+BBR BBR Elettra Highlights 2024–2025 141
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