Risk of Halo-Induced Magnet Quenches in the HL-LHC Beam Dump Insertion

Jean-Baptiste Potoine , Andrea Apollonio , Eleonora Belli , Chiara Bracco , Roderik Bruce , Marco d'Andrea , Ruben García Alía , Anton Lechner , Giuseppe Lerner , Sara Morales Vigo , Stefano Redaelli , Valeria Rizzoglio , Eleftherios Skordis , Andreas Waets , Frederic Wrobel (1, 2)

1 IES - Institut d’Electronique et des Systèmes
2 RADIAC - Radiations et composants

After the High Luminosity (HL-LHC) upgrade, the LHC will be exposed to a higher risk of magnet quenches during periods of short beam lifetime. Collimators in the extraction region (IR6) assure the protection of magnets against asynchronous beam dumps, but they also intercept a fraction of the beam halo leaking from the betatron cleaning insertion. In this paper, we assess the risk of quenching nearby quadrupoles during beam lifetime drops. In particular, we present an empirical analysis of halo losses in IR6 using LHC Run 2 (2015-2018) beam loss monitor measurements. Based on these results, the halo-induced power density in magnet coils expected in HL-LHC is estimated using FLUKA Monte Carlo shower simulations.

Mots clés: proton; insertion; collimation; betatron; operation; CERN LHC Coll; luminosity: upgrade; beam: lifetime; magnet: superconductivity; quenching; beam: halo; collimator; beam dump; numerical calculations: Monte Carlo; beam loss; FLUKA; quadrupole lens

Domaines: Physique des accélérateurs [physics.acc-ph]

Jean-Baptiste Potoine, Andrea Apollonio, Eleonora Belli, Chiara Bracco, Roderik Bruce, et al.. Risk of Halo-Induced Magnet Quenches in the HL-LHC Beam Dump Insertion. 12th International Particle Accelerator Conference , May 2021, Online, Brazil. pp.MOPAB002, ⟨10.18429/JACoW-IPAC2021-MOPAB002⟩. ⟨hal-03371332⟩