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Daly, A.

Paper Title Page
MOPAN104 Current Monitor for the ISIS Synchrotron RF Cavity Bias Regulator 407
  • A. Daly
    STFC/RAL, Chilton, Didcot, Oxon
  • C. W. Appelbee, D. Bayley
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  The ISIS facility at the Rutherford Appleton Laboratory in the UK is currently the world's most intense pulsed neutron source. The accelerator consists of a 70 MeV H- Linac and an 800 MeV, 50 Hz, proton Synchrotron. The synchrotron beam is accelerated using six, ferrite loaded, RF cavities each having its own high voltage r.f. drive amplifier and bias system. Each of these cavities is driven as a high Q tuned r.f. circuit; the resonant frequency being controlled by passing a current through a bias winding. This current comes from the Bias Regulator system which consists in part of eight banks of 40 transistors. This paper describes the design of a system which will use digital techniques to monitor and display the current of each of the 320 transistors in the Bias Regulator system.  
WEPMN076 Digital Master Oscillator Results for the ISIS Synchrotron 2203
  • C. W. Appelbee, A. Seville
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  • A. Daly
    STFC/RAL, Chilton, Didcot, Oxon
  Rutherford Appleton Laboratory in Oxfordshire is home to an 800MeV synchrotron particle accelerator called ISIS. Its main function is to direct a beam of protons into a heavy metal target to produce neutrons for scientists to analyse condensed matter. A second harmonic system is being developed to upgrade the beam current from 200uA to 300uA in order to drive a second target station. This is being achieved by the inclusion of four second harmonic cavities to increase the width of the RF bucket. In the past the six fundamental cavities were driven by an analogue master oscillator but the extra cavities will bring more difficultly in the phasing of the system. This could be more easily and precisely controlled by embedding a Direct Digital Synthesis core into an FPGA chip as the heart of a new digital Master Oscillator. This paper describes the results of the setting up and performance of the prototype instrument and the implications it has for the synchrotron.  
TUPAN111 Status Report on the RAL Front End Test Stand 1634
  • J. K. Pozimski
    STFC/RAL, Chilton, Didcot, Oxon
  • J. Alonso, R. Enparantza
    Fundacion Tekniker, Elbr (Guipuzkoa)
  • J. J. Back
    University of Warwick, Coventry
  • J. Bermejo
    Bilbao, Faculty of Science and Technology, Bilbao
  • Y. Cheng, S. Jolly, A. Kurup, P. Savage
    Imperial College of Science and Technology, Department of Physics, London
  • M. A. Clarke-Gayther, A. Daly, D. C. Faircloth, A. P. Letchford
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  • C. Gabor, D. C. Plostinar
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon
  • J. Lucas
    Elytt Energy, Madrid
  High power proton accelerators (HPPAs) with beam powers in the several megawatt range have many applications including drivers for spallation neutron sources, neutrino factories, waste transmuters and tritium production facilities. The UK's commitment to the development of the next generation of HPPAs is demonstrated by a test stand being constructed in collaboration between RAL, Imperial College London and the University of Warwick. The aim of the RAL Front End Test Stand is to demonstrate that chopped low energy beams of high quality can be produced and is intended to allow generic experiments exploring a variety of operational regimes. This paper describes the status of the RAL Front End Test Stand which consists of five main components: a 60 mA H- ion source, a low energy beam transport, a 324 MHz Radio Frequency Quadrupole accelerator, a high speed beam chopper and a comprehensive suite of diagnostics. The aim is to demonstrate production of a 60 mA, 2 ms, 50 pps, chopped H- beam at 3 MeV.