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Whitehead, M.

Paper Title Page
MOPC142 Study of the Post Extraction Acceleration Gap in the ISIS H- Penning Ion Source 406
 
  • D. C. Faircloth, M. Whitehead, T. Wood
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  • C. Gabor
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon
  • J. K. Pozimski
    STFC/RAL, Chilton, Didcot, Oxon
 
  The RAL Front End Test Stand (FETS) is being constructed to demonstrate a chopped H- beam of up to 60 mA at 3 MeV with 50 pps and sufficiently high beam quality for future high-power proton accelerators (HPPA). The injection energy into the RFQ will be in the range of 50 to 70 keV whereas the standard ISIS H- Penning ion source operates at 35 keV, therefore the post extraction acceleration voltage must be increased. In order to finalise the design of the FETS post extraction system, a study is conducted on the Ion Source Development Rig (ISDR) at ISIS. This study shows how beam transport is affected by different post extraction acceleration voltages and gap lengths. Beam, current, profile and emittance measurements are presented along with theoretical calculations.  
MOPC143 Multi-beamlet Study of Beam Transport in the ISIS H- Ion Source Analysing Magnet 409
 
  • D. C. Faircloth, S. R. Lawrie, A. P. Letchford, M. E. Westall, M. Whitehead, T. Wood
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
 
  The RAL Front End Test Stand (FETS) is being constructed to demonstrate a chopped H- beam of up to 60 mA at 3 MeV with 50 pps and sufficiently high beam quality for future high-power proton accelerators (HPPA). The existing 90° analysing magnet on the ISIS H- Penning ion source does not perfectly transport the beam after extraction. The present ion source has a 10 mm x 0.6 mm slit extraction aperture. To understand how the beam is transported in the analysing magnet, new ion source aperture plates are manufactured with 5 individual holes instead of a slit. These holes produce separate beamlets that are used to study transport in the sector magnet. This paper details the experiments with the modified aperture plates on the Ion Source Development Rig (ISDR) at ISIS.  
MOPC144 Installation of the Front End Test Stand High Performance H- Ion Source at RAL 412
 
  • D. C. Faircloth, M. H. Bates, S. R. Lawrie, A. P. Letchford, M. Perkins, M. E. Westall, M. Whitehead, P. Wise, T. Wood
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  • C. Gabor
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon
  • J. K. Pozimski, P. Savage
    Imperial College of Science and Technology, Department of Physics, London
 
  The RAL Front End Test Stand (FETS) is being constructed to demonstrate a chopped H- beam of up to 60 mA at 3 MeV with 50 pps and sufficiently high beam quality for future high-power proton accelerators (HPPA). This paper details the first stage of construction- the installation of the ion source.  
MOPC150 Modifications to the Analysing Magnet in the ISIS Penning Ion Source 427
 
  • S. R. Lawrie, D. C. Faircloth, A. P. Letchford, M. E. Westall, M. Whitehead, T. Wood
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  • J. K. Pozimski
    STFC/RAL, Chilton, Didcot, Oxon
 
  A full 3D electromagnetic finite element analysis and particle tracking study is undertaken of the ISIS Penning surface plasma ion source using CST Particle Studio 2008. The existing 90° analysing magnet is found to have a magnetic field index of 1.3, causing beam divergence and contributing to beam loss. Different magnet pole piece geometries are modelled and the effect of space charge investigated. Based on this modelling, three new sets of poles are manufactured and tested on the Ion Source Development Rig. The results are presented herein.