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Description
A visible–ultraviolet (Vis–UV) diagnostic beamline is being developed for Siam Photon Source II (SPS-II) to enable precise transverse electron beam size measurements. The vertical (π) polarization technique using the dipole radiation has been selected to enable vertical beam size measurements below 10 µm. Given the limited space available in the double-triple bend achromat (DTBA) lattice, a removable first mirror has been designed for installation inside the dipole vacuum chamber. This introduces significant engineering challenges in extracting diagnostic photons while managing the substantial thermal load from the dipole radiation fan, without inducing flow-related vibration or optical surface deformation. This paper presents the conceptual design of the first mirror system, associated thermal and mechanical considerations, and the optical layout of the Vis–UV diagnostic beamline. Detailed beamline modeling and synchrotron radiation calculations performed using Synchrotron Radiation Workshop (SRW) are also presented to evaluate beam transport and diagnostic performance.
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