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Title First Beam Tests at the CERN SPS of an Electro-Optic Beam Position Monitor for the HL-LHC
  • A. Arteche, G.E. Boorman, A. Bosco, S.M. Gibson
    Royal Holloway, University of London, Surrey, United Kingdom
  • S.E. Bashforth, G.E. Boorman, A. Bosco, S.M. Gibson
    JAI, Egham, Surrey, United Kingdom
  • N. Chritin, M. Krupa, T. Lefèvre, T.E. Levens
    CERN, Geneva, Switzerland
Abstract An Electro-Optic Beam Position Monitor is being developed for the HL-LHC, aimed at the detection of high order proton bunch instabilities and as a diagnostic for crabbed bunch rotation. A prototype EO-BPM was installed in the CERN SPS during 2016 and recent first beam tests of the EO pick-up are presented. The tested system comprises two opposing pick-ups, each equipped with 5mm cubic LiNbO3 crystals in vacuum, illuminated by polarized light from a fibre-coupled CW 780 nm laser. The 1 ns proton bunch induces a temporal modulation in the polarization state of light emerging from each birefringent crystal, by the Pockels effect. The modulation is analyzed, then recorded by a fibre-coupled fast photodetector in the counting room. The very first experimental signals obtained by the EO-pickups of a passing proton bunch are reported as a proof of concept of the idea. Moreover, the expected response of the beam signal is measured with respect to remotely controlled changes in the polarizer and analyzer orientations. The data are compared with analytical and electromagnetic simulations. Following the first detection, we report the latest status of the prototype design and future prospects.
Funding Work funded by UK STFC grant ST/N001583/1, JAI at Royal Holloway University of London and CERN.
Paper download TUPCF23.PDF [0.851 MB / 4 pages]
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Conference IBIC2017, Grand Rapids, MI, USA
Series International Beam Instrumentation Conference (6th)
Proceedings Link to full IBIC2017 Proccedings
Session Tuesday Poster
Date 22-Aug-17   16:00–18:00
Main Classification 3 BPMs and Beam Stability
Keywords ion, pick-up, polarization, proton, simulation
Publisher JACoW, Geneva, Switzerland
Editors Zhengzheng Liu (FRIB, East Lansing, MI, USA); Steven Lidia (FRIB, East Lansing, MI, USA); Amy McCausey (FRIB, East Lansing, MI, USA); Volker RW Schaa (GSI, Darmstadt, Germany)
ISBN 978-3-95450-192-2
Published March 2018
Copyright © 2018 by JACoW, Geneva, Switzerland     CC-BY Creative Commons License
cc Creative Commons Attribution 3.0