New RF Scheme for All-Mode Switching Through CEPC Project Lifecycle
Explore the innovative RF scheme proposed for seamless switching in the CEPC project, addressing issues from previous schemes and optimizing performance, flexibility, and luminosity for future upgrades. Discover solutions for layout dynamics, challenges in RF sections, and discussions on enhancing center facilities over the years.
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Presentation Transcript
New RF scheme for all-mode switching through CEPC project lifecycle Jiyuan Zhai, Yiwei Wang IHEP CEPC Day, August 29, 2022
Problems of Previous CEPC RF schemes + + + - - - + + + CDR design H Mode - - - Outer Ring Outer Ring HL-Z impossible Inner Ring Inner Ring Unable to run H/W/Z after ttbar upgrade W & Z Mode Outer Ring Outer Ring Quite limited performance and flexibility Inner Ring Inner Ring Recent TDR design Outer Ring H H Need to move Higgs cavities to center for HL-Z Horizontal Crossing Longitudinal separation Inner Ring W luminosity reduced to half after HL-Z upgrade Outer Ring Unable to run H/W after ttbar upgrade Z H Z Inner Ring Solution Outer Ring Put higher energy/lower current cavities in center Z t H t Z Inner Ring
Stage 1 H/W/LL-Z (and HL-H/W upgrade) New RF Scheme 3146 m 160 m 373 m 500 m 1080 m Inner Ring H H 0.35 m 1 m All-mode seamless switching in whole lifecycle (CEPC, ep ) Outer Ring Stage 2 HL-H/W/Z (HL-Z upgrade) No cavity and klystron movement 3146 m Highest luminosity in each energy 160 m 128 m 1080 m 245 m 500 m Maximize performance and flexibility of future circular electron positron collider Inner Ring H H Z Z 0.35 m 1 m 1 m Outer Ring 0.35 m Stage 3 HL-H/W/Z/ttbar (ttbar-upgrade) 3146 m Operation Mode Collider Ring 650 MHz Cavities / Cryomodules 240 m 160 m 128 m 300 m 245 m 500 m Inner Ring H H Z ttbar Z 0.35 m 1 m Higgs/W/LL-Z 240 2-cell / 40 CMs 1 m Outer Ring 0.35 m HL-Z + 100 1-cell / 100 CMs ttbar + 240 5-cell / 60 CMs H Z ttbar 650 MHz 2-cell cavity 6 cavities in 1 CM 650 MHz 5-cell cavity 4 cavities in 1 CM 650 MHz 1-cell cavity 1 cavity in 1 CM
Issues of Overall Layout and Dynamics Longer RF sections ~2*670 m longer RF sections in the whole ring, thus shorter ARC sections U0/U0 +2 %, I/I -2 % as beam current limited by synchrotron radiation power SPPC detector at IP2 and IP4 Possible solution: keep drift ~ 70 m in the center of RF section. Vacuumn chamber at cross section Large diameter of vacuum chamber at the center to reduce the impedance contribution
Discussion Enough space for center ttbar module? Push high gradient high Q in next 20 years. Too long center section if no ttbar upgrade? Space for conventional facilities. Detailed RF region layout of the TDR design needed. Cavity in the inner ring? Maintainess.
