Boorman, G.E. Gale, J.D. Gibson, S.M. Jolly, S. Lawrie, S.R. Letchford, A.P. Pozimski, J.K. Rajaeifar, N. JACoW Geneva, Switzerland 978-3-95450-176-2 10.18429/JACoW-IBIC2015-TUPB073 English 526-529 TUPB073 FPGA electronics ion LabView operation Contribution to a conference proceedings 2016 2016-01 http://dx.doi.org/10.18429/JACoW-IBIC2015-TUPB073 http://accelconf.web.cern.ch/AccelConf/IBIC2015/papers/tupb073.pdf 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.