[2E01-08] Vaccuum Science and Technology (VST)

10:15 AM - 10:45 AM JST(1:15 AM - 1:45 AM UTC)

[2E03【International Joint Symposium】] Vacuum system development for Siam Photon Source II: from design and simulation to prototyping and verification

*THANAPONG PHIMSEN¹, Supan Boonsuya¹, Sarawut Chitthaisong¹, Sireegorn Sumklang¹, Orayanee Seegauncha¹, Jirayu Sukain¹, Pat Photongkam¹, Ratchadaporn Supruangnet¹, Thipusa Wongpinij¹ (1. Synchrotron Light Research Institute (Thailand))

The engineering of vacuum systems for fourth-generation synchrotrons is constrained by tight spaces and sub-millimeter clearances. This work presents the integrated vacuum system development for the Siam Photon Source II (SPS-II) DTBA lattice. The design couples a localized pumping strategy near photon absorbers with precision oil-less CNC machining of aluminum chambers. Advanced finite element analysis and Monte Carlo simulations validate structural stability, thermal safety, and the attainment of ultra-high vacuum (UHV) pressures under beam-induced loads. A domestic prototyping program successfully fabricated three test chambers, including a complex, three-dimensionally curved bending chamber. Metrology confirmed that geometric deformations remained strictly within lattice tolerances, while thermal outgassing tests qualified the in-house UHV chemical cleaning protocol by outperforming project specifications.

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