Paper |
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WEPPR079 |
Observations of Microbunching Instabilities from a THz Port at Diamond Light Source |
3114 |
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- W. Shields, G.E. Boorman, V. Karataev, A. Lyapin
JAI, Egham, Surrey, United Kingdom
- R. Bartolini, A.F.D. Morgan, G. Rehm
Diamond, Oxfordshire, United Kingdom
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Diamond Light source is a third generation synchrotron facility dedicated to producing radiation of outstanding brightness. Above a threshold current, the electron bunches are susceptible to the phenomenon known as the microbunching instability. This instability is characterised by the onset of radiation bursts, the wavelength of which is around one order of magnitude shorter than the bunch length. Near threshold, the bursting occurs quasi-‐periodically, however at higher currents, the bursting appears randomly. The high frequencies involved in these emissions make detection and analysis challenging. A port specifically for the investigation of mm wave emissions has recently been built at Diamond. Ultra fast Schottky Barrier Diode detectors have been installed to obtain data for only a small fraction of the bunch revolution time in an updated data acquisition system. The threshold current and subsequent evolution of the instability have been investigated.
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MOPPR055 |
A Two-dimensional Wire Scanner for a Low Energy Ion Beam |
909 |
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- C. Gabor
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
- G.E. Boorman
Royal Holloway, University of London, Surrey, United Kingdom
- A.P. Letchford
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
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The Front End Test Stand (FETS) at the Rutherford Appleton Laboratory (RAL) is intended to demonstrate the early stages of acceleration for future high power proton applications. So far, the H− ion source and the low energy beam transport (LEBT) are operational. The commissioning of the LEBT is carried out with a multipurpose diagnostics vessel. On the other hand, the present status of the LEBT does not provide any permanent installed beam diagnostics beyond current measurement. Possible diagnostics need to be compact and rigid in a way that it can survive an area with potentially high beam losses and not suffering to much of beam noise. Furthermore, minimal invasive diagnostics is preferred. It is intended to present first results of a wire scanner where the geometry has been changed in a way that the two dimensional xy-space is accessible.
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MOPPR056 |
Experimental and Theoretical Studies of a Low Energy H− beam |
912 |
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- C. Gabor
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
- G.E. Boorman
Royal Holloway, University of London, Surrey, United Kingdom
- A.P. Letchford
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
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The Front End Test Stand (FETS) at the Rutherford Appleton Laboratory (RAL) is intended to demonstrate the early stages of acceleration (0-3 MeV) and beam chopping required for high power proton accelerators. At the moment, the RFQ is under construction and there is a need to understand the matching of the Low Energy Beam Transport (LEBT) into the RFQ as conclusive as possible. The parameter of interest may include solenoid settings, steering effects but also the influence of the post acceleration of the ion source and potential effects of space charge compensation. Two emittance scanner are installed and can be combined with scintillator acting as a beam profile monitor and auxiliaries like current measurement.
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THPPP051 |
Status of the RAL Front End Test Stand |
3856 |
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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, A. Kurup, 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
Royal Holloway, University of London, Surrey, United Kingdom
- C. Gabor, D.C. Plostinar
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
- A. Garbayo
AVS, Eibar, Gipuzkoa, Spain
- S. Jolly
UCL, London, 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 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 plus comprehensive diagnostics. This paper describes the current status of the project and future plans.
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