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| MOPAN104 |
Current Monitor for the ISIS Synchrotron RF Cavity Bias Regulator
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407 |
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- A. Daly
STFC/RAL, Chilton, Didcot, Oxon
- C. W. Appelbee, D. Bayley
STFC/RAL/ISIS, Chilton, Didcot, Oxon
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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.
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| TUPAN117 |
Progress on Dual Harmonic Acceleration on the ISIS Synchrotron
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1649 |
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- A. Seville, D. J. Adams, C. W. Appelbee, D. Bayley, N. E. Farthing, I. S.K. Gardner, M. G. Glover, B. G. Pine, J. W.G. Thomason, C. M. Warsop
STFC/RAL/ISIS, Chilton, Didcot, Oxon
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The ISIS facility at the Rutherford Appleton Laboratory in the UK is currently the most intense pulsed, spallation, neutron source. The accelerator consists of a 70 MeV H- linac and an 800 MeV, 50 Hz, rapid cycling, proton synchrotron. The synchrotron beam intensity is 2.5·1013 protons per pulse, corresponding to a mean current of 200 μA. The synchrotron beam is accelerated using six, ferrite loaded, RF cavities with harmonic number 2. Four additional, harmonic number 4, cavities have been installed to increase the beam bunching factor with the potential of raising the operating current to 300μA. The dual harmonic system has now been used operationally for the first time, running reliably throughout the last ISIS user cycle of 2006. This paper reports on the hardware commissioning, beam tests and improved operational results obtained so far with dual harmonic acceleration.
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