• Open Access

Long term dynamics of the high luminosity Large Hadron Collider with crab cavities

J. Barranco García, R. De Maria, A. Grudiev, R. Tomás García, R. B. Appleby, and D. R. Brett
Phys. Rev. Accel. Beams 19, 101003 – Published 11 October 2016

Abstract

The High Luminosity upgrade of the Large Hadron Collider (HL-LHC) aims to achieve an integrated luminosity of 200300fb1 per year, including the contribution from the upgrade of the injector chain. For the HL-LHC the larger crossing angle together with a smaller beta function at the collision point would result in more than 70% luminosity loss due to the incomplete geometric overlap of colliding bunches. To recover head-on collisions at the high-luminosity particle-physics detectors ATLAS and CMS and benefit from the very low β* provided by the Achromatic Telescopic Squeezing (ATS) optics, a local crab cavity scheme provides transverse kicks to the proton bunches. The tight space constraints at the location of these cavities leads to designs which are axially non-symmetric, giving rise to high order multipoles components of the main deflecting mode and, since these kicks are harmonic in time, we expand them in a series of multipoles in a similar fashion as is done for static field magnets. In this work we calculate, for the first time, the higher order multipoles and their impact on beam dynamics for three different crab cavity prototypes. Different approaches to calculate the multipoles are presented. Furthermore, we perform the first calculation of their impact on the long term stability of the machine using the concept of dynamic aperture.

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  • Received 23 June 2016

DOI:https://doi.org/10.1103/PhysRevAccelBeams.19.101003

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Accelerators & Beams

Authors & Affiliations

J. Barranco García

  • EPFL, Lausanne CH-1015, Switzerland and CERN, Geneva 23 CH-1211, Switzerland

R. De Maria, A. Grudiev, and R. Tomás García

  • CERN, Geneva 23 CH-1211, Switzerland

R. B. Appleby and D. R. Brett

  • School of Physics and Astronomy, The University of Manchester, M13 9PL Manchester, United Kingdom and Cockcroft Institute, Daresbury Laboratory, Warrington WA4 4AD, United Kingdom

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Issue

Vol. 19, Iss. 10 — October 2016

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