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- 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
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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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