• Open Access

Analytical N beam position monitor method

A. Wegscheider, A. Langner, R. Tomás, and A. Franchi
Phys. Rev. Accel. Beams 20, 111002 – Published 10 November 2017

Abstract

Measurement and correction of focusing errors is of great importance for performance and machine protection of circular accelerators. Furthermore LHC needs to provide equal luminosities to the experiments ATLAS and CMS. High demands are also set on the speed of the optics commissioning, as the foreseen operation with β*-leveling on luminosity will require many operational optics. A fast measurement of the β-function around a storage ring is usually done by using the measured phase advance between three consecutive beam position monitors (BPMs). A recent extension of this established technique, called the N-BPM method, was successfully applied for optics measurements at CERN, ALBA, and ESRF. We present here an improved algorithm that uses analytical calculations for both random and systematic errors and takes into account the presence of quadrupole, sextupole, and BPM misalignments, in addition to quadrupolar field errors. This new scheme, called the analytical N-BPM method, is much faster, further improves the measurement accuracy, and is applicable to very pushed beam optics where the existing numerical N-BPM method tends to fail.

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  • Received 10 July 2017

DOI:https://doi.org/10.1103/PhysRevAccelBeams.20.111002

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

A. Wegscheider*, A. Langner, and R. Tomás

  • CERN, CH 1211 Geneva 23, Switzerland

A. Franchi

  • ESRF, CS 40220, 38043 Grenoble CEDEX 9, France

  • *andreas.wegscheider@cern.ch

Article Text

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Issue

Vol. 20, Iss. 11 — November 2017

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