Heavy-Ion Operation of HL-LHC

Jowett, John; Schaumann, Michaela; Versteegen, Reine

doi:10.1142/9789814675475_0021

Cited by 10 publications

(12 citation statements)

References 12 publications

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“…The change of the mass/charge ratio caused by these processes leads to secondary beams that can potentially quench the LHC magnets. This problem was only recently mitigated for ATLAS and CMS by directing the secondary beams between magnets, while a special new collimator is required for ALICE [43,44].…”

Section: Average Instantaneous Luminositymentioning

confidence: 99%

New long-lived particle searches in heavy-ion collisions at the LHC

et al. 2020

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We show that heavy ion collisions at the LHC provide a promising environment to search for signatures with displaced vertices in well-motivated New Physics scenarios. Compared to proton collisions, they offer several advantages, i) the number of parton level interactions per collision is larger, ii) there is no pile-up, iii) the lower instantaneous luminosity compared to proton collisions allows to operate the LHC experiments with very loose triggers, and iv) there are new production mechanisms that are absent in proton collisions. In the present work we focus on the third point and show that the modification of the triggers alone can increase the number of observable events by orders of magnitude if the long lived particles are predominantly produced with low transverse momentum. Our results show that collisions of ions lighter than lead are well-motivated from the viewpoint of searches for New Physics. We illustrate this for the example of heavy neutrinos in the Neutrino Minimal Standard Model.

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Section: Average Instantaneous Luminositymentioning

confidence: 99%

New long-lived particle searches in heavy-ion collisions at the LHC

et al. 2020

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“…The small size of these secondary beams gives rise to very localized losses which, in turn, lead to a localized increase of BLM signals in the proximity of the impact location. BLM patterns measured during ion operation in 2010, 2011, 2015, and 2018 showed clear evidence of the presence of 208 Pb 81þ losses in the dispersion suppressors next to IR1, IR2, and IR5 [95][96][97].…”

Section: B Proton-proton Collisionsmentioning

confidence: 99%

Validation of energy deposition simulations for proton and heavy ion losses in the CERN Large Hadron Collider

Lechner

Auchmann

Baer

et al. 2019

Phys. Rev. Accel. Beams

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shower simulations are essential for understanding and predicting the consequences of beam losses in high-energy proton and ion colliders. Shower simulations are routinely used at CERN for estimating the beam-induced energy deposition, radiation damage, and radioactivity in the Large Hadron Collider (LHC). Comparing these shower simulations against beam loss measurements is an important prerequisite for assessing the predictive ability of model calculations. This paper validates FLUKA simulation predictions of beam loss monitor (BLM) signals against BLM measurements from proton fills at 3.5 and 4 TeV and 208 Pb 82þ ion fills at 1.38A TeV. The paper addresses typical loss scenarios and loss mechanisms encountered in LHC operation, including proton collisions with dust particles liberated into the beams, halo impact on collimators in the betatron cleaning insertion, proton-proton collisions in the interaction points, and dispersive losses due to bound-free pair production in heavy ion collisions. Model predictions and measured signals generally match within a few tens of percent, although systematic differences were found to be as high as a factor of 3 for some regions and source terms.

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“…The rapidities of the proton and Pb beams are 11.6 and 10.6, respectively. A first conservative estimate of the integrated luminosity for Pb-Pb collisions is of about 5 nb −1 per month of running [2], that is about five times larger than the current projection for the future LHC runs [3].…”

Section: Introductionmentioning

confidence: 99%

Heavy-ion physics studies for the Future Circular Collider

et al. 2014

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The Future Circular Collider (FCC) design study is aimed at assessing the physics potential and the technical feasibility of a new collider with centre-of-mass energies, in the hadron-hadron collision mode including proton and nucleus beams, more than seventimes larger than the nominal LHC energies. An electron-positron collider in the same tunnel is also considered as an intermediate step, which would provide the electron-hadron option in the long term. First ideas on the physics opportunities with heavy ions at the FCC are presented, covering the physics of Quark-Gluon Plasma, gluon saturation, photon-induced collisions, as well as connections with ultra-high-energy cosmic rays.

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Heavy-Ion Operation of HL-LHC

Cited by 10 publications

References 12 publications

New long-lived particle searches in heavy-ion collisions at the LHC

New long-lived particle searches in heavy-ion collisions at the LHC

Validation of energy deposition simulations for proton and heavy ion losses in the CERN Large Hadron Collider

Heavy-ion physics studies for the Future Circular Collider

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