Abstract
EuroCirCol is a conceptual design study of a post-LHC, Future Circular Hadron Collider (FCC-hh) with 50 TeV of beam energy and 100 km long, which aims to expand the current energy and luminosity frontiers. The vacuum chamber of the FCC-hh will have to cope with unprecedented levels of synchrotron radiation power for proton colliders, dealing simultaneously with a tighter magnet aperture. Considering that the high radiation power and photon flux will release larger amounts of gas into the system, the difficulty to meet the vacuum specifications increases substantially compared with the LHC. This paper presents a study on the beam induced vacuum effects for the FCC-hh novel conditions, the different phenomena which, owing to the presence of the beam, have an impact on the accelerator's vacuum level. It is concluded that thanks to the adopted mitigation measures the proposed vacuum system shall be adequate, allowing us to reach $\ensuremath{\le}1\ifmmode\times\else\texttimes\fi{}{10}^{15}\text{ }\text{ }{\mathrm{H}}_{2\text{ }eq}/{\mathrm{m}}^{3}$ with baseline beam parameters within the first months of conditioning.
Highlights
The Future Circular Hadron Collider (FCC-hh) is a 100 km long particle collider, being developed in the frame of the EuroCirCol conceptual design study
This paper presents a study on the beam induced vacuum effects for the FCC-hh novel conditions, the different phenomena which, owing to the presence of the beam, have an impact on the accelerator’s vacuum level
This so-called recycling effect is represented by the secondary molecular yield (η0ph), which must be taken into account during the design of a cryogenic vacuum system
Summary
Built being able to achieve SR power densities in the order of electron light sources As it is known, the outgassing related to photon stimulated desorption (PSD) scales with εc [6]. X j σj σH2 nj ð3Þ where the index j represents each gas species in the vacuum chamber, n the gas density and σj the nuclear scattering cross section. This allows to introduce the H2 equivalent gas density term (nH2eq), which represents the addition of all the gas species into one single gas density value: nH2 eq. The feasibility of the FCC-hh vacuum system is assessed
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