1,723,881 research outputs found
GEANT4 Simulations of the ISIS Muon Target at Rutherford Appleton Laboratory
No full textMuSR science requires the availabilty of intense beams
of polarised positive muons. At the ISIS pulsed muon facility
at Rutherford Appleton Laboratory the muons are generated
from a low Z thin slab graphite target inserted in
the proton beam. We report on the use of the Monte Carlo
simulation code Geant4 in simulations of the performance
of the current muon target. The results are benchmarked
against the experimental performance of the target
Central laser facility Rutherford Appleton Laboratory : annual report 2001/2002
No full textIncludes bibliographical references and indexSIGLEAvailable from British Library Document Supply Centre- DSC:8715. 1804(no 2002-013) / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Example global ozone monitoring experiment (GOME) plots.
No full textThe primary product of the GOME dataset held at the BADC is ozone (O3) profiles retrieved from radiances measured by the Global Ozone Monitoring Experiment (GOME) onboard ERS-2. Other products include column O3, column NO2, and column BrO as well as estimates of errors of all the retrieved variables. The retrievals are performed at the Rutherford Appleton Laboratory by the Remote Sensing Group. This is a number of example plots from the dataset
Proton driver scenarios at CERN and Rutherford Appleton Laboratory
No full textThe concept of sharing a high-power proton accelerator (proton driver) between neutrino production and other facilities such as a high-energy collider or a spallation neutron source is an attractive, cost-effective solution which is being studied in site-specific cases as part of accelerator upgrade plans at CERN and at the ISIS facility at the Rutherford Appleton Laboratory. Descriptions of these proton-driver scenarios will be given primarily in the context of the Neutrino Factory, but other neutrino production plans at CERN will also be noted
The High Resolution Dynamics Limb Sounder (HIRDLS): UK Project Office Web Site (superseded)
No full textThe HIRDLS instrument is an international joint development project between the USA and UK and is flying on the Earth Observing System (EOS) AURA Mission Spacecraft. The AURA mission was successfully launched on July 15, 2004 at 11:02am BST
ISIS: A World Centre for Neutrons and Muons
No full text"The world's brightest pulsed neutron and muon source located at the UK Rutherford Appleton Laboratory," ISIS "supports an international community of around 1600 scientists who use neutrons and muons for research in physics, chemistry, materials science, geology, engineering, and biology." Researchers can find detailed accounts of scientific advances from annual reports. Students can discover the characteristics of pulsed source, achievements of neutron scattering, and the details of a material world. The vibrant website presents the current and archived news, details of the ISIS instrumentation, the accelerator, and the target
STUDY OF X-RAY LASER SCHEMES USING NEW EXPERIMENTAL FACILITIES AT THE RUTHERFORD-APPLETON-LABORATORY
No full textUn nouveau systeme a été installé au Rutherford Appleton Laboratory sur le laser a neodyme Vulcan : permettant de réaliser une tache focale allongée e t d'utiliser un spectrographe XUV avec résolution temporelle. Le systeme a été dessiné pour l'étude de differents schémas de laser X et a été utilisé pour des observations préliminaires. On a étudié particulierement le schéma de recombinaison du carbone CVI en utilisant des cibles constitués de fibres de longueur pouvant atteindre 2cm. Les mesures mettent clairement en évidence une amplification de la transition Hα du carbone CVI, à la longueur d'onde 18.2nm.New experimental facilities have recently been developed at the Rutherford Appleton Laboratory for line focus irradiation using the Vulcan Neodymium glass laser installation and for time-resolved spectroscopy of VUV emission. The system is designed for study of XUV lasers and has been used in a preliminary survey of several schemes. Particular emphasis has been placed on study of the CVI recombination laser using fibre targets of up to 2cm length. Measurements show clear evidence of amplification on the 18.2nm Hα transition in CVI
Tuneable graphite intercalates for hydrogen storage
Full text linkThe development of hydrogen as an energy transfer mechanism is of great
importance to alleviate environmental damage and economic destabilisation
caused by over-reliance on oil, as long as the hydrogen can be generated renewably. To be suitable for road transport applications, safe and compact
hydrogen storage systems need to be developed, the primary technological
motivation for this PhD project which investigates hydrogen absorbed into
graphite intercalation compounds (GICs), to gain a fundamental physical understanding of the sorption processes to improve such materials' capacity for
hydrogen storage. Literature searching has led to a principal investigation,
primarily using neutron scattering and thermogravimetry, of potassium and
calcium-GICs with hydrogen. Inelastic neutron scattering on hydrogenated
KC24 has shown hydrogen sorption in this system to be quantitatively different from its analogues RbC24 and CsC24. A consistent model of the H2 sites
and dynamics has been proposed. Time-resolved structural data on the hydriding phase transition in KC8Hx have been obtained. A calcium-ammonia
intercalate has shown most promise for hydrogen storage, with uptake of 3.2
wt.% H2 at 77 K and 2 bar, a signifcant amount of the 6 wt.% target set by
the US DoE. It is concluded that available internal volume and donor charge
in GICs are critical parameters for optimising hydrogen uptake
Studies of the fast ignition route to inertial confinement fusion at the Rutherford Appleton Laboratory
No full textThe Rutherford Appleton Laboratory has been at the forefront of investigations into the physics associated with the fast ignition concept for inertial confinement fusion. This scheme involves complex laser-plasma processes, the theoretical understanding of which relies heavily on particle-in-cell calculations. In this paper, three experiments displaying quantitative agreement with detailed multi-dimensional PIC calculations are reviewed: hole-boring velocity measurements; relativistic self-focusing; and harmonic generation from plasma surfaces. Qualitative agreement of hot electron temperature measurements with PIC simulations are also discussed. The authors believe these results are very encouraging for the fast ignition concept. (C) 1999 Published by Elsevier Science S.A. All rights reserved
The MICE Muon Beam on ISIS and the beam-line instrumentation of the Muon Ionization Cooling Experiment
Full text linkThe international Muon Ionization Cooling Experiment (MICE), which is under construction at the Rutherford Appleton Laboratory (RAL), will demonstrate the principle of ionization cooling as a technique for the reduction of the phase-space volume occupied by a muon beam. Ionization cooling channels are required for the Neutrino Factory and the Muon Collider. MICE will evaluate in detail the performance of a single lattice cell of the Feasibility Study 2 cooling channel. The MICE Muon Beam has been constructed at the ISIS synchrotron at RAL, and in MICE Step I, it has been characterized using the MICE beam-instrumentation system. In this paper, the MICE Muon Beam and beam-line instrumentation are described. The muon rate is presented as a function of the beam loss generated by the MICE target dipping into the ISIS proton beam. For a 1 V signal from the ISIS beam-loss monitors downstream of our target we obtain a 30 KHz instantaneous muon rate, with a neglible pion contamination in the beam
- …
