Progress with Long-Range Beam-Beam Compensation Studies for High Luminosity LHC

Rossi, Adriana; Perini, D.; Cattenoz, G.; Carra, Federico; Nikiforov, D. A.; Stancari, G.; Papaphilippou, Y.; Patapenka, Andrei; Bertarelli, A.; Barnyakov, A. M.; Delaup, Yorick; Zanoni, C.; Boccard, C; Schmickler, H.; Fitterer, M.; Valishev, Alexander; Aberle, O.; Lendaro, Jerome; Gobbi, Giorgia; Fartoukh, S.; Redaelli, Stefano; Albertone, Joel; Levichev, A. E.

doi:10.18429/jacow-ipac2017-tupva115

Cited by 1 publication

(3 citation statements)

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“…The two other experiments are located in the IPs 2 and 8, where the ALICE [31] and LHCb [32] detectors are respectively installed. During the two winter technical stops of 2017 and 2018, demonstrators of BBLR wire compensators have been installed in the LHC [16], around the two high-luminosity IPs. The wires are installed for Beam 2 only, as it was the only beam foreseen to operate with a coronograph [33], which is a device allowing for transverse beam halo measurements.…”

Section: Setup and Hardware Layout For The Experimentsmentioning

confidence: 99%

“…Differently from the other wire experiments recalled in Section I, the wire demonstrators installed in the LHC are embedded in collimators [16]. Collimators are devices used in the LHC in order to clean the beam halos and protect the machine against possible beam losses that would damage it [36,37].…”

Section: Wires In Collimatorsmentioning

confidence: 99%

“…A proposed solution to cope with the residual BBLR interactions and their possible implications is the use of Direct Current (DC) wires to mitigate the detrimental effect of such phenomena. Despite the specific hardware technical challenges for its alignment [16,17], the use of DC wire compensators is comparable to the other magnets of the machine lattice in terms of operation. Hence, its impact on the machine availability (c) is expected to be marginal in comparison to the crab cavities complexity.…”

Section: Introduction and Motivationsmentioning

confidence: 99%

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First Experimental Evidence of a Beam-Beam Long-Range Compensation Using Wires in the Large Hadron Collider

Poyet¹,

Bertarelli²,

Carra³

et al. 2022

Preprint

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In high intensity and high energy colliders such as the CERN Large Hadron Collider and its future High Luminosity upgrade, interactions between the two beams around the different Interaction Points impose machine performance limitations. In fact, their effect reduces the beam lifetime and therefore the collider's luminosity reach. Those interactions are called Beam-Beam Long-Range interactions and a possible mitigation of their effect using DC wires was proposed for the first time in the early 2000's. This solution is currently being studied as an option for enhancing the HL-LHC performance. In 2017 and 2018, four demonstrators of wire compensators have been installed in the LHC. A two-year long experimental campaign followed in order to validate the possibility to mitigate the BBLR interactions in the LHC. During this campaign, a proof-of-concept was completed and motivated an additional set of experiments, successfully demonstrating the mitigation of BBLR interactions effects in beam conditions compatible with the operational configuration. This paper reports in detail the preparation of the experimental campaign, the obtained results and draws some perspectives for the future.

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Section: Setup and Hardware Layout For The Experimentsmentioning

confidence: 99%

Section: Wires In Collimatorsmentioning

confidence: 99%

Section: Introduction and Motivationsmentioning

confidence: 99%

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