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Vacuum Properties of NEG and Carbon Coatings Exposed to Synchrotron
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Europe/Zurich
30/7-018 (CERN)
30/7-018
CERN
Description
Vacuum Properties of NEG and Carbon Coatings Exposed to Synchrotron
Radiation
Abstract:
Under the CERN-KEK collaboration, photon-stimulated desorption (PSD) and photoelectron (PE) yields from TiZrV and amorphous-carbon coatings have been systematically measured. The study outcome will be applied to the vacuum system designs for future accelerators, such as the Future Circular Colliders (FCCs) and high-brightness light sources, where these coatings are expected to play an important role in improving the accelerator performance.
Sample chambers were prepared at CERN and then irradiated at KEK’s Photon Factory with Synchrotron Radiation (SR) of 4-keV critical energy, which is similar to that of FCC-hh. Thus far, six samples have been tested at room temperature, and the comparative study has shown that the activated NEG coating has the lowest PSD yield and the carbon coating has the lowest PE yield. Recently, NEG coating saturated with CO was irradiated, and the sticking factors and PSD gas species were measured.
