Paper |
Title |
Page |
MOPC143 |
Multi-beamlet Study of Beam Transport in the ISIS H- Ion Source Analysing Magnet
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409 |
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- D. C. Faircloth, S. R. Lawrie, A. P. Letchford, M. E. Westall, M. Whitehead, T. Wood
STFC/RAL/ISIS, Chilton, Didcot, Oxon
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The RAL Front End Test Stand (FETS) is being constructed to demonstrate a chopped H- beam of up to 60 mA at 3 MeV with 50 pps and sufficiently high beam quality for future high-power proton accelerators (HPPA). The existing 90° analysing magnet on the ISIS H- Penning ion source does not perfectly transport the beam after extraction. The present ion source has a 10 mm x 0.6 mm slit extraction aperture. To understand how the beam is transported in the analysing magnet, new ion source aperture plates are manufactured with 5 individual holes instead of a slit. These holes produce separate beamlets that are used to study transport in the sector magnet. This paper details the experiments with the modified aperture plates on the Ion Source Development Rig (ISDR) at ISIS.
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MOPC144 |
Installation of the Front End Test Stand High Performance H- Ion Source at RAL
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412 |
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- D. C. Faircloth, M. H. Bates, S. R. Lawrie, A. P. Letchford, M. Perkins, M. E. Westall, M. Whitehead, P. Wise, T. Wood
STFC/RAL/ISIS, Chilton, Didcot, Oxon
- C. Gabor
STFC/RAL/ASTeC, Chilton, Didcot, Oxon
- J. K. Pozimski, P. Savage
Imperial College of Science and Technology, Department of Physics, London
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The RAL Front End Test Stand (FETS) is being constructed to demonstrate a chopped H- beam of up to 60 mA at 3 MeV with 50 pps and sufficiently high beam quality for future high-power proton accelerators (HPPA). This paper details the first stage of construction- the installation of the ion source.
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MOPC150 |
Modifications to the Analysing Magnet in the ISIS Penning Ion Source
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427 |
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- S. R. Lawrie, D. C. Faircloth, A. P. Letchford, M. E. Westall, M. Whitehead, T. Wood
STFC/RAL/ISIS, Chilton, Didcot, Oxon
- J. K. Pozimski
STFC/RAL, Chilton, Didcot, Oxon
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A full 3D electromagnetic finite element analysis and particle tracking study is undertaken of the ISIS Penning surface plasma ion source using CST Particle Studio 2008. The existing 90° analysing magnet is found to have a magnetic field index of 1.3, causing beam divergence and contributing to beam loss. Different magnet pole piece geometries are modelled and the effect of space charge investigated. Based on this modelling, three new sets of poles are manufactured and tested on the Ion Source Development Rig. The results are presented herein.
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TUPC057 |
Improving the ISIS Emittance Scanner Software
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1185 |
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- S. R. Lawrie, D. C. Faircloth, A. P. Letchford
STFC/RAL/ISIS, Chilton, Didcot, Oxon
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The software to drive the slit-slit emittance scanners at ISIS is re-written in C#. The scanner driver routine is enhanced to improve accuracy, and to allow real-time monitoring of the scanning procedure. A multiple document interface allows quick comparison with other measurements and with data from particle tracking codes. Integrated data processing and emittance calculation removes the need to transfer data between multiple software packages, making experimental work more efficient. A user-friendly and robust interface allows easy scanning and generates publication quality emittance plots for presentations.
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THPP024 |
Detailed Study of the RF Properties of the FETS RFQ Cold Model
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3422 |
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- S. Jolly, A. Kurup, D. A. Lee, J. K. Pozimski, P. Savage
Imperial College of Science and Technology, Department of Physics, London
- Y. Cheng
IHEP Beijing, Beijing
- A. P. Letchford
STFC/RAL, Chilton, Didcot, Oxon
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A 324MHz four vane RFQ cold model has been built, as part of the development of a proton driver Front End Test Stand (FETS) at the Rutherford Appleton Laboratory (RAL) in the UK. Previous measurements to determine the electric field profile were made using the bead-pull perturbation method: these measurements have been refined and expanded. New measurements of the electric field profile, Q-value and resonant modes are presented. Measurements of the fundamental frequency and Q-value of the RFQ as a result of modifications to the profile of the end flange inserts are also given. Finally, an experiment is outlined to determine the beam transmission properties of the cold model based on beam transport simulations with the General Particle Tracer package (GPT).
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THPP029 |
Status of the RAL Front End Test Stand
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3437 |
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- A. P. Letchford, M. A. Clarke-Gayther, D. C. Faircloth, 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, R. Enparantza
Fundación Tekniker, Elbr (Guipuzkoa)
- J. J. Back
University of Warwick, Coventry
- F. J. Bermejo
Bilbao, Faculty of Science and Technology, Bilbao
- C. Gabor, D. C. Plostinar
STFC/RAL/ASTeC, Chilton, Didcot, Oxon
- J. Lucas
Elytt Energy, Madrid
- J. Pasternak, J. K. Pozimski
STFC/RAL, Chilton, Didcot, Oxon
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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.
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THPP083 |
Megawatt Upgrades for the ISIS Facility
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3554 |
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- J. W.G. Thomason, D. J. Adams, D. J.S. Findlay, I. S.K. Gardner, B. Jones, A. P. Letchford, S. J. Payne, B. G. Pine, A. Seville, C. M. Warsop, R. E. Williamson
STFC/RAL/ISIS, Chilton, Didcot, Oxon
- D. C. Plostinar, C. R. Prior, G. H. Rees
STFC/RAL/ASTeC, Chilton, Didcot, Oxon
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ISIS is the spallation neutron source at the Rutherford Appleton Laboratory in the UK. Presently, it runs at beam powers of 0.2 MW, with upgrades in place to supply increased powers for the new Second Target Station due to start operation in autumn 2008. This paper outlines schemes for major upgrades to the facility in the megawatt regime, with options for 1, 2 and 5 MW. The ideas centre around new 3.2 GeV RCS designs that can be employed to increase the energy of the existing ISIS beam to provide powers of ~1 MW or, possibly as a second upgrade stage, accumulate and accelerate beam from a new 0.8 GeV linac for 2-5 MW beams. Summaries of ring designs are presented, along with studies and simulations to assess the key loss mechanisms that will impose intensity limitations. Important factors include injection, RF systems, instabilities, longitudinal and transverse space charge.
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