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SLAC Publication: SLAC-PUB-17224
SLAC Release Date: February 5, 2018
HE-LHC Optics Development
Nosochkov, Yuri.
The High Energy LHC (HE-LHC) proton-proton collider is a proposed replacement of the LHC in the existing 27-km tunnel, with the goal of increasing a centre-of-mass (CM) beam energy from 14 to 27 TeV. Some of the challenges of this machine are: A factor of almost two higher dipole field Higher field in quadrupoles and sextupoles Attaining sufficient dynamic aperture (DA) in presence of potentially larger field errors Fitting the ring close to the present LHC layout The nominal LHC arc magnets... Show Full Abstract
The High Energy LHC (HE-LHC) proton-proton collider is a proposed replacement of the LHC in the existing 27-km tunnel, with the goal of increasing a centre-of-mass (CM) beam energy from 14 to 27 TeV. Some of the challenges of this machine are: A factor of almost two higher dipole field Higher field in quadrupoles and sextupoles Attaining sufficient dynamic aperture (DA) in presence of potentially larger field errors Fitting the ring close to the present LHC layout The nominal LHC arc magnets have the aperture of 56 mm, and provide the field up to 8.33 T in dipoles, 223 T/m in quadrupoles, and 4430 T/m^2 in sextupoles. The high field required at the HE-LHC beam energy can be realized by taking advantage of the magnet technology being developed for the 100-km FCC-hh design. The latter aims at reaching 16 T field in dipoles, 400 T/m gradient in quadrupoles, and 7800 T/m^2 in sextupoles, where the magnet aperture is 50 mm. Scaling of the present LHC to 27 TeV CM energy yields the magnet field exceeding the FCC specifications. Therefore, a new lattice design is required. Design of the FCC 16-T dipole is based on Nb3Sn superconductor; this however may potentially degrade the field quality (FQ), compared to the LHC dipole based on Nb-Ti superconductor. Further FQ degradation may be caused by a large swing between the HE-LHC injection and collision energies, and due to the slightly smaller magnet aperture. The resulting larger non-linear field errors may limit the ring dynamic aperture, especially at injection energy, where the field errors are typically larger than a Show Partial Abstract
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  • Interest Categories: Accelerator Physics