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Clarke-Gayther, M. A.

Paper Title Page
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.  
TUPAN112 Slow-Wave Chopper Structures for Next Generation High Power Proton Drivers 1637
  • M. A. Clarke-Gayther
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  Funding: Work supported by CCLRC/RAL/ASTeC and the European Community Research Infrastructure Activity under the FP6 "Structuring the European Research Area" programme (CARE, contract No. RII3-CT-50295)

A description is given of slow-wave chopper structures for the 3.0 MeV, 60 mA, H- MEBT lines of the CERN Linac 4 and RAL Front-End Test Stands (FETS). Transmission line properties and transverse E-field uniformity for the original European Spallation Source (ESS) designs* have been refined by modelling static, and time dependent electromagnetic fields in the 3D CST 'EM Studio', and 'Microwave Studio' codes**. In addition, the original compact, radiation hard, vacuum compatible designs have been simplified and reconfigured to be compatible with standard NC machining practice. Transmission line properties in the frequency and time domain, together with E-field uniformity in the axial and transverse planes, are presented.

* M. A. Clarke-Gayther, 'Slow-wave electrode structures for the ESS 2.5 MeV fast chopper', Proc. of the 2003 Particle Accelerator Conference (PAC), Portland, Oregon, USA, p. 1473-1475.** www.cst.com