Paper |
Title |
Page |
TUPEA058 |
The Conceptual Design of CLARA, A Novel FEL Test Facility for Ultrashort Pulse Generation |
1265 |
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- J.A. Clarke, D. Angal-Kalinin, R.K. Buckley, S.R. Buckley, P.A. Corlett, L.S. Cowie, D.J. Dunning, B.D. Fell, P. Goudket, A.R. Goulden, S.P. Jamison, J.K. Jones, A. Kalinin, B.P.M. Liggins, L. Ma, K.B. Marinov, P.A. McIntosh, J.W. McKenzie, K.J. Middleman, B.L. Militsyn, A.J. Moss, B.D. Muratori, H.L. Owen, R.N.C. Santer, Y.M. Saveliev, R.J. Smith, S.L. Smith, E.W. Snedden, M. Surman, T.T. Thakker, N. Thompson, R. Valizadeh, A.E. Wheelhouse, P.H. Williams
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
- R. Appleby, M. Serluca, G.X. Xia
UMAN, Manchester, United Kingdom
- R.J. Barlow, A.M. Kolano
University of Huddersfield, Huddersfield, United Kingdom
- R. Bartolini, I.P.S. Martin
Diamond, Oxfordshire, United Kingdom
- N. Bliss, R.J. Cash, G. Cox, G.P. Diakun, A. Gallagher, D.M.P. Holland, B.G. Martlew, M.D. Roper
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
- S.T. Boogert
Royal Holloway, University of London, Surrey, United Kingdom
- G. Burt
Lancaster University, Lancaster, United Kingdom
- L.T. Campbell, B.W.J. MᶜNeil
USTRAT/SUPA, Glasgow, United Kingdom
- S. Chattopadhyay
Cockcroft Institute, Warrington, Cheshire, United Kingdom
- A. Lyapin
JAI, Egham, Surrey, United Kingdom
- D. Newton, A. Wolski
The University of Liverpool, Liverpool, United Kingdom
- V.V. Paramonov
RAS/INR, Moscow, Russia
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The conceptual design of CLARA, a novel FEL test facility focussed on the generation of ultrashort photon pulses with extreme levels of stability and synchronisation is described. The ultimate aim of CLARA is to experimentally demonstrate, for the first time, that sub-coherence length pulse generation with FELs is viable. The results will translate directly to existing and future X-Ray FELs, enabling them to generate attosecond pulses, thereby extending the science capabilities of these intense light sources. This paper will describe the design of CLARA, pointing out the flexible features that will be incorporated to allow multiple novel FEL schemes to be proven.
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WEPFI065 |
The Commissioning of the EBTF S-band Photoinjector Gun at Daresbury Laboratory |
2845 |
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- A.E. Wheelhouse, R.K. Buckley, S.R. Buckley, P.A. Corlett, J.W. McKenzie, B.L. Militsyn, A.J. Moss
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
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The first stage of the installation of the Electron Beam Test Facility (EBTF) at Daresbury Laboratory has been completed and a commissioning phase is presently underway. At the heart of the machine is a photoinjector based on a two and a half cell S-band RF gun incorporating a metallic photocathode, which is capable of delivering 4-6 MeV, low emittance, short electron pulses (10 - 250 pC). The photoinjector is driven by a UV light at 266 nm wavelength delivered by a laser system and is powered by a RF system incorporating a Low Level RF system, a high power RF modulator and a klystron. This paper describes the commissioning and conditioning of the photoinjector.
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WEPFI066 |
The RF System for the MICE Experiment |
2848 |
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- K. Ronald, A.J. Dick, C.G. Whyte
USTRAT/SUPA, Glasgow, United Kingdom
- P.A. Corlett
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
- A.J. DeMello, D. Li, S.P. Virostek
LBNL, Berkeley, California, USA
- A.F. Grant, A.J. Moss, C.J. White
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
- P.M. Hanlet
IIT, Chicago, Illinois, USA
- C. Hunt, K.R. Long, J. Pasternak
Imperial College of Science and Technology, Department of Physics, London, United Kingdom
- T.H. Luo, D.J. Summers
UMiss, University, Mississippi, USA
- A. Moretti, R.J. Pasquinelli, D.W. Peterson, R.P. Schultz, J.T. Volk
Fermilab, Batavia, USA
- P.J. Smith
Sheffield University, Sheffield, United Kingdom
- T. Stanley
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
- Y. Torun
Illinois Institute of Technology, Chicago, IL, USA
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The International Muon Ionisation Cooling Experiment (MICE) is designed to demonstrate the effectiveness of ionisation cooling to reduce the phase space footprint of a muon beam, principally to allow the subsequent acceleration of muons for next generation colliders and/or neutrino factories. The experiment (and indeed any subsequent accelerator cooling channel based on the same principles) poses certain unusual requirements on its RF system, whilst the precision measurement of the ionisation cooling process demands special diagnostics. This paper shall outline the key features of the RF system, including the LLRF control, the power amplifier chain, distribution network, cavities, tuners and couplers, all of which must operate in a high magnetic field environment. The RF diagnostics which, in conjunction with the other MICE diagnostics, shall allow detailed knowledge of the amplitude and phase of the acceleration field during the transit of each individual Muon shall also be outlined.
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WEPME052 |
LLRF Characterisation of the Daresbury International Cryomodule |
3046 |
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- L. Ma
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
- P.A. Corlett, A.J. Moss
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
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The 2-cavity Superconducting RF (SRF) Linac cryomodule of the Accelerators and Lasers in Combined Experiments (ALICE) located at Daresbury Laboratory will be replaced by a new International ERL Cryomodule in early 2013. The improved 7-cell, 1.3 GHz SRF cavities will be characterised and compared with the original 9-cell cavities. Tests will be performed by driving the cavities by a VCO-PLL loop so that Q measurements, microphonics sensitivity and Lorentz force detuning can be analysed. A digital LLRF system using the LLRF4 board developed by Larry Doolittle has been developed at Daresbury Laboratory and will be installed on the upgraded cryomodule. This system is capable of controlled cavity filling to reduce waveguide reflection voltage, feedback/feed forward control and adaptive beam loading compensation. The new cryomodule will be evaluated with both the analog LLRF system and the digital LLRF system to allow for performance comparison. Cavity operation with high QL will also be tested to discover the feedback control limit as a function of inherent microphonics. This paper sets out to discuss the qualification process, testing and results of the upgraded cryomodule installation.
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