Abstract
A design study for a future collider to be built in the LHC tunnel, the High-Energy Large Hadron Collider (HE-LHC), has been launched as part of the Future Circular Collider (FCC) study at CERN. It would provide proton collisions at a centre-of-mass energy of 27 TeV as well as collisions of heavy ions at the equivalent magnetic rigidity. HE-LHC is being designed under the stringent constraint of using the existing tunnel and therefore the resulting lattice and optics differ in layout and phase advance from the LHC. It is necessary to evaluate the performance of the collimation system for ion beams in HE-LHC in addition to proton beams. In the case of ion beams, the fragmentation and electromagnetic dissociation that relativistic heavy ions can undergo in collimators, as well as the unprecedented energy per nucleon of the HE-LHC, requires dedicated simulations. Results from a study of collimation efficiency for the nominal lead ion (208Pb82+) beams performed with the SixTrack-FLUKA coupling framework are presented. These include loss maps with comparison against an estimated quench limit as well as detailed considerations of loss spikes in the superconducting aperture for critical sections of the machine such as the dispersion suppressors.
Highlights
The High-Energy Large Hadron Collider (HE-LHC) is a design study for a future energy frontier proton-proton collider with 27 TeV centre-of-mass energy [1, 2, 3, 4]
A design study for a future collider to be built in the LHC tunnel, the High-Energy Large Hadron Collider (HE-LHC), has been launched as part of the Future Circular Collider (FCC) study at CERN
The HE-LHC will use the magnet technology proposed for the hadron option of the Future Circular Collider (FCC-hh), but will be housed within the existing LHC tunnel
Summary
The High-Energy Large Hadron Collider (HE-LHC) is a design study for a future energy frontier proton-proton collider with 27 TeV centre-of-mass energy [1, 2, 3, 4]. The HE-LHC will use the magnet technology proposed for the hadron option of the Future Circular Collider (FCC-hh), but will be housed within the existing LHC tunnel. As in the LHC, collimators are housed in two dedicated insertion regions (IRs) i.e. IR7 for betatron collimation and IR3 for off-momentum collimation. Each of these IRs includes a 3-stage collimation system - primary collimators (TCPs) intercept halo particles, secondary collimators (TCSGs) capture particles out-scattered by the TCPs and shower absorbers (TCLAs) stop the showers generated in collimators upstream.
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