• J.K. Pozimski, S. Jolly
  Imperial College of Science and Technology, Department of Physics, London
• J.J. Back
  University of Warwick, Coventry
• D.C. Faircloth, A.P. Letchford
  STFC/RAL/ISIS, Chilton, Didcot, Oxon
• C. Gabor, D.C. Plostinar
  STFC/RAL/ASTeC, Chilton, Didcot, Oxon

In order to contribute to the development of high power proton accelerators in the MW range, to prepare the way for an ISIS upgrade and to contribute to the UK design effort on neutrino factories, a front end test stand (FETS) is being constructed at the Rutherford Appleton Laboratory (RAL) in the UK. The aim of the FETS is to demonstrate the production of a 60 mA, 2 ms, 50 pps chopped beam at 3 MeV with sufficient beam quality. The results of numerical simulations of the particle dynamics from the charge separation dipole behind the ion source to the end of the MEBT will be presented. Previous measurements showed that the emittance of the beam delivered by the ion source exceeded our expectations by more than a factor of 3. Since then various changes in the beam extraction/post accelerator region reduced the beam emittance by a factor of 2. Simulations of the particle dynamics in the FETS based on distributions gained from recent measurements of the transversal beam emittance behind the ion source will be presented and the results for different input distributions discussed.

• A.P. Letchford, M.A. Clarke-Gayther, D.J.S. Findlay, S.R. Lawrie, P. Romano, P. Wise
  STFC/RAL/ISIS, Chilton, Didcot, Oxon
• S.M.H. Al Sari, S. Jolly, A. Kurup, D.A. Lee, P. Savage
  Imperial College of Science and Technology, Department of Physics, London
• J. Alonso
  Fundación Tekniker, Elbr (Guipuzkoa)
• J.J. Back
  University of Warwick, Coventry
• F.J. Bermejo
  Bilbao, Faculty of Science and Technology, Bilbao
• R. Enparantza
  Fundación TEKNIKER, Eibar (Gipuzkoa)
• D.C. Faircloth, J. Pasternak, J.K. Pozimski
  STFC/RAL, 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, the University of Warwick and the Universidad del Pais Vasco, Bilbao. 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 conditions. This paper describes the current status of the RAL Front End Test Stand.

Slides