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Gardner, I. S.K.

Paper Title Page
MOPC119 Low-Output-Impedance RF System for the ISIS Second Harmonic Cavity 343
 
  • Y. Irie, S. Fukumoto, K. Muto, A. Takagi
    KEK, Ibaraki
  • D. Bayley, I. S.K. Gardner, A. Seville, J. W.G. Thomason
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  • J. C. Dooling, D. Horan, R. Kustom, M. E. Middendorf
    ANL, Argonne, Illinois
  • T. Oki
    Tsukuba University, Ibaraki
 
  Low-output-impedance RF system for the second harmonic cavity in the ISIS synchrotron has been developed by the collaboration between Argonne National Laboratory, US, KEK, Japan and Rutherford Appleton Laboratory, UK. Low output impedance is realized by the feedback from plate output to grid input of the final triode amplifier, resulting in less than 30 Ω over the frequency range of interest. Precise control of the second harmonic voltage can then be realized without considering beam loading effects. Beam test scenario in the ISIS synchrotron is discussed.  
MOPC121 Progress on Dual Harmonic Acceleration on the ISIS Synchrotron 349
 
  • A. Seville, D. Bayley, I. S.K. Gardner, J. W.G. Thomason, C. M. Warsop
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  • D. J. Adams
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon
 
  The ISIS synchrotron at the Rutherford Appleton Laboratory in the UK is currently undergoing an RF upgrade. Four, h=4 cavities have been installed in addition to the existing 6, h=2, cavities and should be capable of increasing the operating current from 200 to 300 μA. Two of the four cavities have been in operation for the last 2 user cycles improving trapping lossess and increasing operating currents beyond 200 μA. The remaining two cavities were commissioned in the spring of 2008. This paper reports on hardware commissioning, beam tests and beam simulation results.  
THPP083 Megawatt Upgrades for the ISIS Facility 3554
 
  • J. W.G. Thomason, D. J. Adams, D. J.S. Findlay, I. S.K. Gardner, B. Jones, A. P. Letchford, S. J. Payne, B. G. Pine, A. Seville, C. M. Warsop, R. E. Williamson
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  • D. C. Plostinar, C. R. Prior, G. H. Rees
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon
 
  ISIS is the spallation neutron source at the Rutherford Appleton Laboratory in the UK. Presently, it runs at beam powers of 0.2 MW, with upgrades in place to supply increased powers for the new Second Target Station due to start operation in autumn 2008. This paper outlines schemes for major upgrades to the facility in the megawatt regime, with options for 1, 2 and 5 MW. The ideas centre around new 3.2 GeV RCS designs that can be employed to increase the energy of the existing ISIS beam to provide powers of ~1 MW or, possibly as a second upgrade stage, accumulate and accelerate beam from a new 0.8 GeV linac for 2-5 MW beams. Summaries of ring designs are presented, along with studies and simulations to assess the key loss mechanisms that will impose intensity limitations. Important factors include injection, RF systems, instabilities, longitudinal and transverse space charge.