Author: Goldblatt, A.
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MOPMR030 Performance of the Upgraded Synchrotron Radiation Diagnostics at the LHC 306
  • G. Trad, E. Bravin, A. Goldblatt, S. Mazzoni, F. Roncarolo
    CERN, Geneva, Switzerland
  • T.M. Mitsuhashi
    KEK, Ibaraki, Japan
  During the LHC long shut down in 2014, the transverse beam size diagnostics based on synchrotron radiation was upgraded in order to cope with the increase of the LHC beam energy to 6.5 TeV. The wavelength used for imaging was shifted to near ultra-violet to reduce the contribution of diffraction to the system resolution, while in parallel, a new diagnostic system based on double slit interferometry was installed to measure the beam size by studying the spatial coherence of the emitted synchrotron radiation. This method has never been implemented before in a proton machine. A Hartmann mask was also installed to identify possible wavefront distortions that could affect the system accuracy. This paper will focus on the comparison of visible and the near ultra-violet imaging and on the first experience with interferometry.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMR030  
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WEPMY024 A Spectrometer for Proton Driven Plasma Accelerated Electrons at AWAKE - Recent Developments 2605
  • L.C. Deacon, S. Jolly, F. Keeble, M. Wing
    UCL, London, United Kingdom
  • B. Biskup, A. Goldblatt, S. Mazzoni, A.V. Petrenko
    CERN, Geneva, Switzerland
  • B. Biskup
    Czech Technical University, Prague 6, Czech Republic
  • M. Wing
    DESY, Hamburg, Germany
  • M. Wing
    University of Hamburg, Hamburg, Germany
  The AWAKE experiment is to be constructed at the CERN Neutrinos to Gran Sasso facility (CNGS). This will be the first experiment to demonstrate proton-driven plasma wakefield acceleration. The 400 GeV proton beam from the CERN SPS will excite a wakefield in a plasma cell several meters in length. To probe the plasma wakefield, electrons of 10–20 MeV will be injected into the wakefield following the head of the proton beam. Simulations indicate that electrons will be accelerated to GeV energies by the plasma wakefield. The AWAKE spectrometer is intended to measure both the peak energy and energy spread of these accelerated electrons. Results of beam tests of the scintillator screen output are presented, along with tests of the resolution of the proposed optical system. The results are used together with a BDSIM simulation of the spectrometer system to predict the spectrometer performance for a range of possible accelerated electron distributions.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY024  
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