Author: Pozimski, J.K.
Paper Title Page
TUPB071 Simulations of the FETS Laser Diagnostic 521
 
  • A. Kurup, J.K. Pozimski, P. Savage
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • S.M. Gibson, K.O. Kruchinin
    JAI, Egham, Surrey, United Kingdom
  • S.M. Gibson, K.O. Kruchinin
    Royal Holloway, University of London, Surrey, United Kingdom
  • A.P. Letchford
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  • J.K. Pozimski
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
  
  The Front-End Test Stand (FETS) aims to demonstrate clean chopping of a 60mA, 3MeV H− ion beam. Such high beam intensities require unconventional emittance and profile measuring devices such as the laserwire system that will be used on FETS. A laser is used to neutralise part of the H− ion beam. The main beam is then separated from the stripped beam by using a dipole magnet. This paper presents tracking results of the laser diagnostic lattice using a simulated field map of an existing dipole magnet and investigates the possibility of laser stripping upstream of the dipole.  
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TUPB073 Characterising the Signal Processing System for Beam Position Monitors at the Front End Test Stand 526
 
  • G.E. Boorman, S.M. Gibson, N. Rajaeifar
    Royal Holloway, University of London, Surrey, United Kingdom
  • J.D. Gale
    University of Sussex, Brighton, United Kingdom
  • S. Jolly
    UCL, London, United Kingdom
  • S.R. Lawrie
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  • A.P. Letchford
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
  • J.K. Pozimski
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  
  A number of beam position monitors are being installed at the Front End Test Stand H− ion source at the Rutherford Appleton Laboratory, UK, as part of the 3 MeV medium energy beam transport. The FETS ion source delivers pulses up to 2 ms long at a rate up to 50 Hz and a maximum current of 60 mA, with a 324 MHz micro-bunch structure imposed by the frequency of the FETS RF acceleration cavity. The response of an in-house designed button BPM has been simulated and then characterised on a wire-based test-rig and the results are presented. The output from a custom algorithm running on a commercial PXI-based FPGA signal processing system is evaluated using test signals from both a function generator and the BPM in the test-rig, to verify the speed and precision of the processing algorithm. The processing system can determine the beam position in eight BPMs, with a precision of better than 20 microns, within one microsecond of the signal sampling being completed. Work is ongoing to reduce the processing time to below 300 ns.  
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