Author: Roncarolo, F.
Paper Title Page
MOPF15 Status of and Future Plans for the CERN LINAC4 Emittance Meter based on Laser Electron-Detachment and a Diamond Strip-Detector 83
 
  • T. Hofmann, E. Bravin, U. Raich, F. Roncarolo, F. Zocca
    CERN, Geneva, Switzerland
  • G.E. Boorman, A. Bosco, S.M. Gibson, K.O. Kruchinin
    Royal Holloway, University of London, Surrey, United Kingdom
  • E. Griesmayer
    CIVIDEC Instrumentation, Wien, Austria
 
  Funding: LA3NET is funded by the European Commission under Grant Agreement Number GA-ITN-2011-289191
LINAC4 has started its staged commissioning at CERN. After completion it will accelerate high brightness H beams to 160 MeV. To measure the transverse profile and emittance of the beam, a non-destructive method based on electron photo-detachment is proposed, using a pulsed, fibre-coupled laser to strip electrons from the H ions. The laser can be focused and scanned through the H beam, acting like a conventional slit. A downstream dipole separates the neutral H0 beamlet, created by the laser interaction, from the main H beam, so that it can be measured by a diamond strip-detector. Combining the H0 beamlet profiles with the laser position allows the transverse emittance to be reconstructed. A prototype of this instrument was tested while commissioning the LINAC4 at 3 and 12 MeV. In this paper we shall describe the experimental setup, challenges and results of the measurements, and also address the characteristics and performance of the diamond strip-detector subsystem. In addition, the proposal for a permanent system at 160 MeV, including an electron detector for a direct profile measurement, will be presented.
 
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