The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - CPAPER AU - Boorman, G.E. AU - Gale, J.D. AU - Gibson, S.M. AU - Jolly, S. AU - Lawrie, S.R. AU - Letchford, A.P. AU - Pozimski, J.K. AU - Rajaeifar, N. TI - Characterising the Signal Processing System for Beam Position Monitors at the Front End Test Stand J2 - Proc. of International Beam Instrumentation Conference (IBIC2015), Melbourne, Australia, 13-17 September 2015 AB - 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. PB - JACoW CY - Geneva, Switzerland SP - 526 EP - 529 KW - FPGA KW - electronics KW - ion KW - LabView KW - operation DA - 2016/01 PY - 2016 SN - 978-3-95450-176-2 DO - 10.18429/JACoW-IBIC2015-TUPB073 UR - http://accelconf.web.cern.ch/AccelConf/IBIC2015/papers/tupb073.pdf ER -