• Open Access

Aperture measurements with ac dipoles and movable collimators in the Large Hadron Collider

N. Fuster-Martínez, R. Bruce, M. Hofer, T. Persson, S. Redaelli, and R. Tomás
Phys. Rev. Accel. Beams 25, 101002 – Published 19 October 2022

Abstract

This paper presents a first experimental demonstration of a new nondestructive method for aperture measurements based on ac dipoles. In high intensity particle colliders, such as the CERN Large Hadron Collider (LHC), aperture measurements are crucial for a safe operation while optimizing the optics in order to reduce the size of the colliding beams and hence increase the luminosity. In the LHC, this type of measurements became mandatory during beam commissioning and the current method used is based on the destructive blowup of bunches using a transverse damper. The new method presented in this paper uses the ac-dipole excitation to generate adiabatic forced oscillations of the beam in order to create losses to identify the smallest aperture in the machine without blowing up the beam emittance. A precise and tuneable control of the oscillation amplitude enables the beams to be reused for several aperture measurements, as well as for other subsequent commissioning activities. Measurements performed with the new method are presented and compared with the current LHC transverse damper method for two different beam energies and two different operational optics.

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  • Received 11 February 2022
  • Accepted 26 September 2022

DOI:https://doi.org/10.1103/PhysRevAccelBeams.25.101002

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International 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

N. Fuster-Martínez*

  • Instituto de Física Corpuscular (CSIC-UV), 46908 Valencia, Spain and CERN, 1211 Geneva, Switzerland

R. Bruce, M. Hofer, T. Persson, S. Redaelli, and R. Tomás

  • CERN, 1211 Geneva, Switzerland

  • *nuria.fuster@ific.uv.es

Article Text

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Vol. 25, Iss. 10 — October 2022

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