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Plostinar, D.C.

Paper Title Page
MOPCH112 The RAL Front End Test Stand 303
 
  • A.P. Letchford, M.A. Clarke-Gayther, D.C. Faircloth, D.C. Plostinar, J.K. Pozimski
    CCLRC/RAL, Chilton, Didcot, Oxon
  • J.J. Back
    University of Warwick, Coventry
  • Y.A. Cheng, S. Jolly, A. Kurup, P. Savage
    Imperial College of Science and Technology, Department of Physics, London
 
  High power proton accelerators (HPPAs) with beam powers in the megawatt range have many possible applications including drivers for spallation neutron sources, neutrino factories, waste transmuters and tritium production facilities. These applications typically propose beam powers of 5 MW or more compared to the highest beam power achieved from a pulsed proton accelerator in routine operation of 0.16 MW at ISIS. 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.  
MOPCH113 Re-bunching RF Cavities and Hybrid Quadrupoles for the RAL Front-end Test Stand (FETS) 306
 
  • D.C. Plostinar
    CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon
  • M.A. Clarke-Gayther
    CCLRC/RAL/ISIS, Chilton, Didcot, Oxon
 
  The proposed FETS project at RAL will test a fast beam chopper in a 3.0 MeV H- Medium Energy Beam Transport (MEBT) line. Space restrictions in the MEBT line place constraints on component length and drive the requirement to identify compact component configurations. A description is given of candidate re-bunching RF cavities and hybrid quadrupole designs. The cavity options considered are the space efficient Drift Tube Linac type cavity (DTL) with integrated quadrupoles, and the high shunt impedance Coupled Cavity Linac type cavity (CCL) with external quadrupoles. The advantages and disadvantages of both structures are discussed and a comprehensive comparison between the two is made enabling the best cavity geometry choice. The compact hybrid quadrupole configurations considered are the 'tandem' combination of permanent magnet (PMQ) and electro-magnetic (EMQ) types, and the concentric combination of PMQ and laminar conductor (Lambertson) EMQ types.