Abstract
We propose a new method for handling the high synchrotron radiation (SR) induced heat load of future circular hadron colliders (like FCC-hh). FCC-hh are dominated by the production of SR, which causes a significant heat load on the accelerator walls. Removal of such a heat load in the cold part of the machine, as done in the Large Hadron Collider, will require more than 100MW of electrical power and a major cooling system. We studied a totally different approach, identifying an accelerator beam screen whose illuminated surface is able to forward reflect most of the photons impinging onto it. Such a reflecting beam screen will transport a significant part of this heat load outside the cold dipoles. Then, in room temperature sections, it could be more efficiently dissipated. Here we will analyze the proposed solution and address its full compatibility with all other aspects an accelerator beam screen must fulfill to keep under control beam instabilities as caused by electron cloud formation, impedance, dynamic vacuum issues, etc. If experimentally fully validated, a highly reflecting beam screen surface will provide a viable and solid solution to be eligible as a baseline design in FCC-hh projects to come, rendering them more cost effective and sustainable.
Highlights
The discovery of a Higgs boson at two Large Hadron Collider (LHC) experiments in 2012 has completed the standard model of particle physics, concluding almost 80 years of theoretical and experimental efforts [1,2]
We propose a new method for handling the high synchrotron radiation (SR) induced heat load of future circular hadron colliders
CERN has launched the Future Circular Collider (FCC) study to deliver a conceptual design report focusing on a 100 TeV center of mass (c.m.) proton-proton collider (FCC-hh), based on 16 T Nb3Sn magnets in a new 100 km tunnel, with a peak luminosity of 5 − 20 × 1034 cm−2 s−1, as shown in Table 1 [4]
Summary
The discovery of a Higgs boson at two Large Hadron Collider (LHC) experiments in 2012 has completed the standard model of particle physics, concluding almost 80 years of theoretical and experimental efforts [1,2]. An opportunely modified LHC-type beam screen, which absorbs all the SR produced heat load in the cryogenic part of the machine, is a solid and convincing base line design for any higher energy future circular hadron collider.
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