Author: Faircloth, D.C.
Paper Title Page
MOPEA064 A New Long Pulse High Voltage Extraction Power Supply for FETS 228
 
  • D.C. Faircloth, S.R. Lawrie, M. Perkins
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
 
  A new 25 kV 2 ms 50 Hz extraction voltage power supply has been developed for the high performance H-minus ion source for the Front End Test Stand at the Rutherford Appleton Laboratory. The power supply has been designed to fit in a single 19 inch rack and has a modular design for easy maintenance. This paper details the design and performance of the power supply and extracted beam currents.  
 
MOPEA065 Commissioning of the Ion Source for Siemens Novel Electrostatic Accelerator 231
 
  • H. von Jagwitz-Biegnitz
    JAI, Oxford, United Kingdom
  • P. Beasley, O. Heid
    Siemens AG, Erlangen, Germany
  • D.C. Faircloth
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  • A.J. Holmes
    Marcham Scientific Ltd, Hungerford, United Kingdom
  • R.G. Selway
    Inspired Engineering Ltd, Climping, United Kingdom
  • B. Singh, E. Zitvogel
    BNL, Upton, New York, USA
 
  Siemens is developing a novel compact DC electrostatic tandem accelerator and currently building a prototype. A dedicated H ion source for this accelerator has been designed and built. This paper reports on some of the design features as well as results of the commissioning phase of this filament driven DC multicusp volume H ion source. Stable H currents of more then 300 μA at 10 keV have been extracted. This satisfies the beam current requirement of the novel accelerator.  
 
THPWA042 Investigation of Space Charge Compensation at FETS 3723
 
  • J.K. Pozimski, S.M.H. Alsari, P. Savage
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • D.C. Faircloth, A.P. Letchford
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
 
  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 ion source and LEBT are operational with the RFQ under manufacture. As a more detailed knowledge is of interest also for other projects like ESS and LINAC4 the FETS LEBT was updated to perform a detailed experimental analysis of space charge compensation utilizing a pulsed decompensation electrode together with a residual gas ion energy spectrometer and a fast emittance measurement device. In the FETS LEBT a high degree of space charge compensation (~90%) and a rise time of space charge compensation around ~ 50 μs could be concluded from measurements . In this paper the results of the experimental work will be presented together with discussion of the findings in respect to beam transport.  
 
THPWO086 Status of the RAL Front End Test Stand 3963
 
  • A.P. Letchford, M.A. Clarke-Gayther, D.C. Faircloth, S.R. Lawrie
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  • S.M.H. Alsari, M. Aslaninejad, J.K. Pozimski, P. Savage
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • J.J. Back
    University of Warwick, Coventry, United Kingdom
  • G.E. Boorman, A. Bosco, S.M. Gibson
    Royal Holloway, University of London, Surrey, United Kingdom
  • R.T.P. D'Arcy, S. Jolly
    UCL, London, United Kingdom
  • C. Gabor, D.C. Plostinar
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
  • J.K. Pozimski
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
 
  The Front End Test Stand (FETS) under construction at RAL is a demonstrator for the front end systems of a future high power proton linac. Possible applications include a linac upgrade for the ISIS spallation neutron source, new future neutron sources, accelerator driven sub-critical systems, a neutrino factory etc. Designed to deliver a 60mA H-minus beam at 3MeV with a 10% duty factor, FETS consists of a high brightness ion source, magnetic low energy beam transport (LEBT), 4-vane 324MHz radio frequency quadrupole, medium energy beam transport (MEBT) containing a high speed beam chopper and non-destructive photo-detachment diagnostics. This paper describes the current status of the project and future plans.