Utility design of the 3 GeV electron storage ring for Siam Photon Source II

The Siam Photon Source II (SPS-II) is a new synchrotron light source currently under development in Thailand. Its 3 GeV electron storage ring features a lattice composed of 14 Double Triple Bend Achromat (DTBA) cells, with a total circumference of 327.6 meters. To ensure beam stability and operational reliability, a comprehensive suite of utility systems is required. The design incorporates critical infrastructure, including the electrical power system, deionized (DI) water system, air conditioning system, and compressed air system. These utilities provide essential support to both accelerator and beamline subsystems, such as magnets and power supplies, RF cavities and power supplies, vacuum chambers, insertion devices, front-end components, and experimental beamlines. This paper focuses on design considerations for the stability of the electrical power systems and the temperature regulation of the DI water and air conditioning systems. The electrical power demands and cooling loads are estimated based on the specific operational requirements of each accelerator subsystem.