Paper |
Title |
Page |
MOPEA064 |
A New Long Pulse High Voltage Extraction Power Supply for FETS |
228 |
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- D.C. Faircloth, S.R. Lawrie, M. Perkins
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
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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.
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MOPEA065 |
Commissioning of the Ion Source for Siemens Novel Electrostatic Accelerator |
231 |
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- 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
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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.
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THPWA042 |
Investigation of Space Charge Compensation at FETS |
3723 |
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- 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
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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.
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THPWO086 |
Status of the RAL Front End Test Stand |
3963 |
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- 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
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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.
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