Speaker
Description
In the FCC-ee study, it is proposed that electron and positron beams circulate at high current and high energy in a 91-km circumference twin ring. The present operational scenario foresees a first running step at an energy of 45.6 GeV and around 1.4 A current, which would generate copious amounts of synchrotron radiation power and flux. To guarantee a quick decrease of the photon desorption yields and so a fast vacuum conditioning, it has been proposed to use localized Synchrotron Radiation Absorbers (SRA) along the vacuum chamber, spaced about 5-6 m apart. This would also help contain the high-energy Compton-scattered secondaries once the beam energy is increased up to 182.5 GeV. Each absorber features a tapered interception surface, where a total power ranging from 2.8 to 4.5 kW is deposited and subsequently dissipated via a dedicated water-cooling circuit integrated into the absorber.
The current absorber design is intended to be manufactured using 3D printing technology. This technology enables to manufacture of the complex SRA geometry and include, at the same time, heat transfer enhancement mechanisms within the cooling channels and the sawtooth profile to lower the reflected photons towards the vacuum chamber. To accurately assess the heat transfer performance of the cooling system, CFD simulations are employed, supporting a more precise thermo-mechanical analysis of the component while also facilitating the exploration and optimization of alternative cooling circuit designs.
All simulation data will be experimentally validated using a thermo-hydraulic test setup equipped with pressure and temperature sensors, enabling the measurement of pressure drops and the calculation of the heat transfer coefficient.
