838 research outputs found
Overview of Solid Target Studies for a Neutrino Factory
No full textThe UK programme of high power target developments for a Neutrino Factory is centred on the study of high-Z materials (tungsten, tantalum). A description of lifetime shock tests on candidate materials is given as part of the research into a solid target solution. A fast high current pulse is applied to a thin wire of the sample material and the lifetime measured from the number of pulses before failure. These measurements are made at temperatures up to ~2000 K. The stress on the wire is calculated using the LS-DYNA code and compared to the stress expected in the real Neutrino Factory target. It has been found that tantalum is too weak to sustain prolonged stress at these temperatures but a tungsten wire has reached over 26 million pulses (equivalent to more than ten years of operation at the Neutrino Factory). An account is given of the optimisation of secondary pion production from the target and the issues related to mounting the target in the muon capture solenoid and target station are discussed
A Low Energy Recycling Non-scaling FFAG for Security and Medicine
No full textBarlow R J: Huddersfield University
Edgecock, T R: Huddersfield University
Johnstone, C: FNAL
Owen, H: Manchester University
Sheehy, S L: STF
Particle Tracking Studies Using Dynamical Map Created from Finite Element Solution of the EMMA Cell
No full textThe unconventional size and the possibility of transverse displacement of the magnets in the EMMA non-scaling FFAG motivates a careful study of particle behavior within the EMMA ring. The magnetic field map of the doublet cell is computed using a Finite Element Method solver; particle motion through the field can then be found by numerical integration, using (for example) OPERA, or ZGOUBI. However, by obtaining an analytical description of the magnetic field (by fitting a Fourier-Bessel series to the numerical data) and using a differential algebra code, such as COSY, to integrate the equations of motion, it is possible to produce a dynamical map in Taylor form. This has the advantage that, after once computing the dynamical map, multi-turn tracking is far more efficient than repeatedly performing numerical integrations. Also, the dynamical map is smaller (in terms of computer memory) than the full magnetic field map; this allows different configurations of the lattice, in terms of magnet positions, to be represented very easily using a set of dynamical maps, with interpolation between the coefficients in different maps*
Beam dynamics in NF-FFAG EMMA with dynamical maps
No full textCopyright @ 2010 by IPAC'10/ACFAThe Non-Scaling Fixed Field Alternating Gradient accelerator EMMA has a compact linear lattice, in which the effects of magnet fringe fields need to be modelled carefully. A numerical magnetic field map can be generated frommagnetmeasurements ormagnet design software. We have developed a technique that produces from the numerical field map, a dynamical map for a particle travelling in a full EMMA cell, for a given reference energy, without acceleration. Since the beam dynamics change with energy, a set of maps have been produced with various reference energies between 10MeV and 20MeV. For each reference energy, the simulated tune and time of flight have been compared with results in Zgoubi - tracking directly through numerical field map. The range of validity of a single map has been investigated by tracking particles with large energy deviation: the results can be used to implement a model of acceleration based on dynamical mapsThis work was supported by the Engineering and Physical Sciences Research Council (EPSRC), UK
Future R&D experiments for Super-Beams, Neutrino Factories and Beta-Beams
No full textThere are three principle options for future beam based neutrino oscillation facilities that could discover and measure CP-violation in the lepton sector. These are conventional Super-Beams, Neutrino Factories and Beta Beams. Several projects have been taking place world-wide to study examples of these facilities. In Europe, one of the most important of these is the Framework Programme 7 supported project, EUROnu. These projects are in the process of identifying experimental R&D work that must be done before a technical design of the facility can be finalised and construction started. This paper will summarise this work for each type of facility, based largely on what has been done in EUROnu.</p
PIP: A low energy recycling nonscaling FFAG for security and medicine
No full textPIP, the Proton Isotope Production accelerator, is a low
energy (6-10 MeV) proton nsFFAG design that uses a sim-
ple 4-cell lattice. Low energy reactions involving the cre-
ation of specific nuclear states can be used for neutron pro-
duction and for the manufacture of various medical iso-
topes. 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 in-
teract 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 accommo-
dated 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
Coordinated neutrino physics R&D in Europe - status and roadmap
No full textEUROnu is a European Commission Framework Programme 7 project undertaking a Design Study of possible future neutrino oscillation facilities for Europe. The three main candidates being studied are a CERN to Frjus Superbeam, a Neutrino Factory and a Beta Beam. This contribution will introduce EUROnu, outline the contributions it is making to the field and explain how it is contributing to the CERN strategy for future facilities
November 2001
No full textthe intense magnetic fields. International Muon Ionization Cooling Experiment (MICE) Steering Committee: A. Blondel (University of Geneva) H. Haseroth (CERN**) R. Edgecock (Rutherford Appleton Laboratory) Y. Kuno (Osaka University) S. Geer (FNAL) D. Kaplan (Illinois Institute of Technology) M. Zisman (Lawrence Berkeley Laboratory) Convener for one year (June 2001-2002), European spokesperson US spokesperson Conveners of Technical teams: a) Concept development and simulations: A. Lombardi (CERN **) P. Spentzouris (FNAL) R. B. Palmer (BNL) b) Hydrogen absorbers: S. Ishimoto (KEK) M. A. Cummings (Northern Illinois) c) RF cavities and power sources R. A. Rimmer (LBNL) R. Garoby (CERN**) d) Magnets M. A. Green (LBNL) J.-M. Rey (CEA Saclay) e) Particle detectors V. Palladino (INFN Napoli) A. Bross (FNAL) f) Beam lines T. R. Edgecock (RAL) C. Petitjean (PSI) g) RF radiation J. Norem (Argonne) E. McKigney (IC London) ** pending the review of CERN a
GEANT4 Studies of Magnets Activation in the HEBT Line for the European Spallation Source
No full textThe 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
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