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Title High Frequency Electro-Optic Beam Position Monitors for Intra-Bunch Diagnostics at the LHC
  • S.M. Gibson, A. Arteche, G.E. Boorman, A. Bosco
    Royal Holloway, University of London, Surrey, United Kingdom
  • P.Y. Darmedru, T. Lefèvre, T.E. Levens
    CERN, Geneva, Switzerland
Abstract At the HL-LHC, proton bunches will be rotated by crab-cavities close to the interaction regions to maximize the luminosity. A method to rapidly monitor the transverse position of particles within each 1ns bunch is required. A novel, compact beam diagnostic to measure the bunch rotation is under development, based on electro-optic crystals, which have sufficient time resolution (<50ps) to monitor intra-bunch perturbations. The electro-optic beam position monitor uses two pairs of crystals, mounted on opposite sides of the beam pipe, whose birefringence is modified by the electric field of passing charged particle beam. The change of birefringence depends on the electric field which itself depends on the beam position, and is measured using polarized laser beams. The electro-optic response of the crystal to the passing bunch has been simulated for HL-LHC bunch scenarios. An electro-optical test stand including a high voltage modulator has been developed to characterize LiTaO3 and LiNiO3 crystals. Tests to validate the different optical configurations will be reviewed. The opto-mechanical design of an electro-optic prototype that will be installed in the CERN SPS will be presented.
Paper download WEDLA02.PDF [0.972 MB / 5 pages]
Slides download WEDLA02_TALK.PDF [46.475 MB]
Poster download WEDLA02_POSTER.PDF [10.813 MB]
Conference IBIC2015, Melbourne, Australia
Series International Beam Instrumentation Conference (4th)
Proceedings Link to full IBIC2015 Proccedings
Session Contributed Orals
Date 16-Sep-15   16:00–17:00
Main Classification BPMs and Beam Stability
Keywords pick-up, laser, diagnostics, simulation, detector
Publisher JACoW, Geneva, Switzerland
Editors Mark Boland (SLSA, Clayton, Australia); David Button (ANSTO, Menai, Australia); Kathleen Riches (SLSA, Clayton, Australia); Volker RW Schaa (GSI, Darmstadt, Germany)
ISBN 978-3-95450-176-2
Published January 2016
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