Speaker
Description
SPring-8-II, the forthcoming fourth-generation light source upgrade of SPring-8, aims to achieve X-ray brilliance approximately two orders of magnitude higher than that of the current facility by reducing the electron beam emittance to 100 pm·rad or less. To accommodate the narrow-bore five-bend lattice, the vacuum system features discrete photon absorbers with dedicated pumps along with compact thin-walled stainless steel chambers*. Two types of photon absorbers have been designed to withstand a total power of up to 2.25 kW and a peak power density of up to 224 W/mm², respectively. The absorber design incorporates a grazing incidence angle on the irradiation surface to reduce power density, a shielding structure designed to confine scattered radiation, and a flange integrated without brazing or welding to eliminate the risk of vacuum leaks. Copper-chromium-zirconium (CuCrZr) was chosen as the material for its superior thermal conductivity and high yield strength. Finite-element analysis using ANSYS was employed to optimize the cooling-channel layout and to ensure compliance with maximum allowable temperature and stress limits.
Footnotes
- K. Tamura et al., "Verification of SPring-8-II vacuum system prototype chamber", MEDSI2025 THP59 (2025).
| Paper status | Proceeding files received |
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