Author: Barlow, R.J.
Paper Title Page
MOPFI071 High Power Cyclotrons for the Neutrino Experiments DAEδALUS and IsoDAR 446
  • R.J. Barlow, A. Bungau, A.M. Kolano
    University of Huddersfield, Huddersfield, United Kingdom
  • A. Adelmann
    PSI, Villigen PSI, Switzerland
  • J.R. Alonso
    LBNL, Berkeley, California, USA
  • W.A. Barletta, A. Calanna, D. Campo, J.M. Conrad
    MIT, Cambridge, Massachusetts, USA
  • L. Calabretta
    INFN/LNS, Catania, Italy
  • F. Méot
    BNL, Upton, Long Island, New York, USA
  • H.L. Owen
    UMAN, Manchester, United Kingdom
  • M. Shaevitz
    Columbia University, New York, USA
  DAEδALUS (Decay At rest Experiment for δcp At a Laboratory for Underground Science) has been proposed to measure the value of the CP violating phase delta through the oscillation of low energy muon anti-neutrinos to electron antineutrinos. With a single large detector, three accelerators at different distances enable the oscillation to be measured with sufficient accuracy. We have proposed the superconducting multi-megawatt DAEδALUS Supercinducting Ring Cyclotron (DSRC) as the means of producing the 800 MeV 12 mA protons required, through the acceleration of H2+, ions with highly efficient stripping extraction. The DSRC comprises twin ion sources and injector cyclotrons, followed by a booster. The injector cyclotron can also be used for a separate experiment, IsoDAR (Isotope Decay At Rest) in which low energy protons produce Lithium 8, and thus a very pure electron antineutrino source which can be used to measure, or rule out, short range oscillation to a sterile neutrino. We describe recent developments in the designs of the injector and the booster, and the prospects for the two experiments.  
MOPFI073 Optimisation Studies of a High Intensity Electron Antineutrino Source 449
  • A. Bungau, R.J. Barlow
    University of Huddersfield, Huddersfield, United Kingdom
  • J.R. Alonso, J.M. Conrad, J. Spitz
    MIT, Cambridge, Massachusetts, USA
  • M. Shaevitz
    Columbia University, New York, USA
  ISODAR (Isotopes-Decay-At-Rest) is a novel, high intensity source of electron antineutrinos produced by the decay of Li-8 isotopes, which aims for searches for physics beyond the standard model. The Li-8 isotopes are produced in the inelastic interactions of low energy protons or deuterons with a Beryllium target. In addition the Li-8 is produced in the surrounding materials by secondary neutrons. This paper focuses on the optimisation of the base design target, moderator and reflector.  
MOPWO057 A Precise Beam Dynamics Model of the PSI Injector 2 1020
  • A.M. Kolano, R.J. Barlow
    University of Huddersfield, Huddersfield, United Kingdom
  • A. Adelmann, C. Baumgarten
    PSI, Villigen PSI, Switzerland
  The Injector 2 at PSI (Paul Scherrer Institut), is a 72 MeV separate sector cyclotron producing a high intensity proton beam up to 3 mA CW, which is subsequently injected to the 590 MeV Ring Cyclotron. The injection energy of the pre-bunched beam is 870 keV at an intensity of 10 to 11 mA. In this paper we describe a full 3D model of the PSI injector 2, starting just before the two bunchers and including the multi stage collimation scheme in the cyclotron. The precise beam dynamics model is based on the OPAL (Object Oriented Parallel Accelerator Library) simulation code. OPAL is a tool for charged-particle optic calculations in large accelerator structures and beam lines including 3D space charge. The presented model will be validated with data from radial profile measurements and loss rates from the collimators and the electrostatic septum in the Injector 2. Based on this model we will estimate the intensity limit of this machine and comment of future operation modes.  
TUPEA058 The Conceptual Design of CLARA, A Novel FEL Test Facility for Ultrashort Pulse Generation 1265
  • 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
  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.  
THPWA037 PIP: A Low Energy Recycling Non-scaling FFAG for Security and Medicine 3711
  • R.J. Barlow, T.R. Edgecock
    University of Huddersfield, Huddersfield, United Kingdom
  • C. Johnstone
    Fermilab, Batavia, USA
  • H.L. Owen
    UMAN, Manchester, United Kingdom
  • S.L. Sheehy
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
  PIP, the Producer of Interacting Protons, is a low energy (6-10 MeV) proton nsFFAG design that uses a simple 4-cell lattice. Low energy reactions involving the creation of specific nuclear states can be used for neutron production and for the manufacture of various medical isotopes. Unfortunately a beam rapidly loses energy in a target and falls below the resonant energy. A recycling ring with a thin internal target enables the particles that did not interact to be re-accelerated and used for subsequent cycles. The increase in emittance due to scattering in the target is partially countered by the re-acceleration, and accommodated by the large acceptance of the nsFFAG. The ring is essentially isochronous, the fields provide strong focussing so that losses are small, the components are simple, and it could be built at low cost with existing technology.  
THPWA038 GEANT4 Studies of Magnets Activation in the HEBT Line for the European Spallation Source 3714
  • C. Bungau, R.J. Barlow, A. Bungau, R. Cywinski, T.R. Edgecock
    University of Huddersfield, Huddersfield, United Kingdom
  • P. Carlsson, H. Danared, F. Mezei
    ESS, Lund, Sweden
  • A.I.S. Holm, S.P. Møller, H.D. Thomsen
    ISA, Aarhus, Denmark
  The High Energy Beam Transport (HEBT) line for the European Spallation Source is designed to transport the beam from the underground linac to the target at the surface level while keeping the beam losses small and providing the requested beam footprint and profile on the target. This paper presents activation studies of the magnets in the HEBT line due to backscattered neutrons from the target and beam interactions inside the collimators producing unstable isotopes.  
THPWA039 GEANT4 Target Simulations for Low Energy Medical Applications 3717
  • N. Ratcliffe, R.J. Barlow, A. Bungau, C. Bungau, R. Cywinski
    University of Huddersfield, Huddersfield, United Kingdom
  The GEANT4 code offers an extensive set of hadronic models for various projectiles and energy ranges. These models include theoretical, parameterized and, for low energy neutrons, data driven models. Theoretical or semi-empirical models sometimes cannot reproduce experimental data at low energies(<100MeV), especially for low Z elements, and therefore recent GEANT4 developments included a new particle\hp package which uses evaluated nuclear databases for proton interactions below 200 MeV. These recent developments have been used to study target designs for low energy proton accelerators, as replacements of research reactors, for medical applications. Presented in this paper are results of benchmarking of these new models for a range of targets, from lithium neutron production targets to molybdenum isotope production targets, with experimental data. Also included is a discussion of the most promising target designs that have currently been studied.