End-to-end beam simulations for the new muon G-2 experiment at Fermilab

The aim of the new muon g-2 experiment at Fermilab is to measure the anomalous magnetic moment of the muon with an unprecedented uncertainty of 140 ppb. A beam of positive muons required for the experiment is created by pion decay. Detailed studies of the beam dynamics and spin polarization of the muons are important to predict systematic uncertainties in the experiment. In this paper, we present the results of beam simulations and spin tracking from the pion production target to the muon storage ring. The end-to-end beam simulations are developed in Bmad and include the processes of particle decay, collimation (with accurate representation of all apertures) and spin tracking

Re-evaluation of the age model for North Atlantic Ocean Site 982 – arguments for a return to the original chronology

publication-status: Publishedtypes: ArticleRecently, the veracity of the published chronology for the Pliocene section of North Atlantic Ocean Drilling Program Site 982 was called into question. Here, we examine the robustness of the original age model as well as the proposed age model revision. The proposed revision is predicated on an apparent mis-identification of the depth to the Gauss-Matuyama (G/M) polarity chronozone reversal boundary (2.581 Ma) based on preliminary shipboard paleomagnetic data and offers a new chronology which includes a hiatus between ~3.2 and 3 Ma. However, an even more accurate shore-based, u-channel-derived polarity chronozone stratigraphy for the past ~2.7 Ma supports the shipboard composite stratigraphy and demonstrates that the original estimate of the depth of the G/M reversal in the Site 982 record is correct. Thus, the main justification forwarded to support the revised chronology no longer exists. We demonstrate that the proposed revision results in a pronounced anomaly in sedimentation rates proximal to the proposed hiatus, erroneous assignment of marine-isotope stages in the Site 982 Pliocene benthic stable oxygen isotope stratigraphy, and a markedly worse correlation of proxy records between this site and other regional paleoclimate data. We conclude that the original chronology for Site 982 is a far more accurate age-model than that which arises from the published revision. We strongly recommend the use of the original chronology for all future work at Site 982

Realistic undulators for intense gamma-ray beams at future colliders

The baseline designs for the ILC and CLIC require the production of an intense flux of gamma rays in their positron sources. In the case of CLIC the gamma rays are produced by a Compton backscattering source, but in this paper we concentrate on undulator-based sources as proposed for the ILC.We present the development of a simulation to generate a magnetic field map based on a Fourier analysis of any measured field map. We have used a field map measured from the ILC helical undulator prototype to calculate the typical distribution of field errors, and used them in our calculations to produce simulated field maps. We show that a loss of gamma ray intensity of ~8% could be expected, compared to the ideal case. This leads to a similar drop in positron production which can be compensated for by increasing the undulator length

Elemental depth profiling of thin film chalcogenides using MeV ion beam analysis

The comprehensive characterisation is one of many technical challenges in the fabrication of photovoltaic devices from novel materials. We show how the application of recent advances in MeV ion beam analysis, providing the selfconsistent treatment of Rutherford backscattering and particle induced X-ray emission spectra, makes a new set of powerful complementary elemental depth profiling techniques available for all thin film technologies, including the chalcopyrite compound semiconductors. We will give and discuss a detailed analysis of a CuInAl metallic precursor film, showing how similar methods are also applicable to other films of interest

Detailed Chemical Abundances in NGC 5824: Another Metal-Poor Globular Cluster with Internal Heavy Element Abundance Variations

We present radial velocities, stellar parameters, and detailed abundances of 39 elements derived from high-resolution spectroscopic observations of red giant stars in the luminous, metal-poor globular cluster NGC 5824. We observe 26 stars in NGC 5824 using the Michigan/Magellan Fiber System (M2FS) and two stars using the Magellan Inamori Kyocera Echelle (MIKE) spectrograph. We derive a mean metallicity of [Fe/H]=-1.94+/-0.02 (statistical) +/-0.10 (systematic). The metallicity dispersion of this sample of stars, 0.08 dex, is in agreement with previous work and does not exceed the expected observational errors. Previous work suggested an internal metallicity spread only when fainter samples of stars were considered, so we cannot exclude the possibility of an intrinsic metallicity dispersion in NGC 5824. The M2FS spectra reveal a large internal dispersion in [Mg/Fe], 0.28 dex, which is found in a few other luminous, metal-poor clusters. [Mg/Fe] is correlated with [O/Fe] and anti-correlated with [Na/Fe] and [Al/Fe]. There is no evidence for internal dispersion among the other alpha- or Fe-group abundance ratios. Twenty-five of the 26 stars exhibit a n-capture enrichment pattern dominated by r-process nucleosynthesis ([Eu/Fe]=+0.11+/-0.12; [Ba/Eu]=-0.66+/-0.05). Only one star shows evidence of substantial s-process enhancement ([Ba/Fe]=+0.56+/-0.12; [Ba/Eu]=+0.38+/-0.14), but this star does not exhibit other characteristics associated with s-process enhancement via mass-transfer from a binary companion. The Pb and other heavy elements produced by the s-process suggest a timescale of no more than a few hundred Myr for star formation and chemical enrichment, like the complex globular clusters M2, M22, and NGC 5286.Comment: Accepted for publication in MNRAS. (26 pages, 18 figures, 9 tables including online data

Comparison of National Policy Frameworks for Marine Renewable Energy within the United Kingdom and France

A report prepared as part of the MERiFIC Project “Marine Energy in FAR Peripheral and Island Communities”The MERiFIC Project: MERiFIC is an EU project linking Cornwall and Finistère through the ERDF INTERREG IVa France (Manche) England programme. The project seeks to advance the adoption of marine energy in Cornwall and Finistère, with particular focus on the island communities of the Parc naturel marin d’Iroise and the Isles of Scilly. Project partners include Cornwall Council, University of Exeter, University of Plymouth and Cornwall Marine Network from the UK, and Conseil général du Finistère, Pôle Mer Bretagne, Technôpole Brest-Iroise, Parc naturel marin d’Iroise, IFREMER and Bretagne Développement Innovation from France. MERiFIC was launched on 13th September at the National Maritime Museum Cornwall and runs until June 2014. During this time, the partners aim to Develop and share a common understanding of existing marine energy resource assessment techniques and terminology; Identify significant marine energy resource ‘hot spots’ across the common area, focussing on the island communities of the Isles of Scilly and Parc Naturel Marin d’Iroise; Define infrastructure issues and requirements for the deployment of marine energy technologies between island and mainland communities; Identify, share and implement best practice policies to encourage and support the deployment of marine renewables; Identify best practice case studies and opportunities for businesses across the two regions to participate in supply chains for the marine energy sector; Share best practices and trial new methods of stakeholder engagement, in order to secure wider understanding and acceptance of the marine renewables agenda; Develop and deliver a range of case studies, tool kits and resources that will assist other regions. To facilitate this, the project is broken down into a series of work packages: WP1: Project Preparation; WP2: Project Management; WP3: Technology Support; WP4: Policy Issues; WP5: Sustainable Economic Development; WP6: Stakeholder Engagement; WP7: Communication and DisseminationThis report provides a comparative assessment of the wider planning, innovation and energy policy instruments relevant to marine renewable energy and applicable to the regions of Brittany in France and South West England. In addition to this, aspects of the wider institutional and political contexts in each country that have an adverse or positive effect upon policies for marine renewable energy (such as regionalisation, devolution or European legislation) are covered when considered appropriate and of value. The intention of this document is to highlight best-practice policies and highlight opportunities and examples of where these have been put into place both nationally and regionally within the two study areas. This work will then feed on to later MERiFIC documents, (specifically within work packages 5 and 6, concerning Sustainable Economic Development and Stakeholder Engagement respectively). The primary reference sources for this document are the two earlier MERiFIC report: National Policy Framework for Marine Renewable Energy within the United Kingdom and National Policy Framework for Marine Renewable Energy within France (Vantoch-Wood et al., 2012, Kablan et al., 2012)

National Policy Framework for Marine Renewable Energy within the United Kingdom

A report prepared as part of the MERiFIC Project "Marine Energy in Far Peripheral and Island Communities"The MERiFIC Project: MERiFIC is an EU project linking Cornwall and Finistère through the ERDF INTERREG IVa France (Manche) England programme. The project seeks to advance the adoption of marine energy in Cornwall and Finistère, with particular focus on the island communities of the Parc naturel marin d’Iroise and the Isles of Scilly. Project partners include Cornwall Council, University of Exeter, University of Plymouth and Cornwall Marine Network from the UK, and Conseil général du Finistère, Pôle Mer Bretagne, Technôpole Brest-Iroise, Parc naturel marin d’Iroise, IFREMER and Bretagne Développement Innovation from France. MERiFIC was launched on 13th September at the National Maritime Museum Cornwall and runs until June 2014. During this time, the partners aim to Develop and share a common understanding of existing marine energy resource assessment techniques and terminology; Identify significant marine energy resource ‘hot spots’ across the common area, focussing on the island communities of the Isles of Scilly and Parc Naturel Marin d’Iroise; Define infrastructure issues and requirements for the deployment of marine energy technologies between island and mainland communities; Identify, share and implement best practice policies to encourage and support the deployment of marine renewables; Identify best practice case studies and opportunities for businesses across the two regions to participate in supply chains for the marine energy sector; Share best practices and trial new methods of stakeholder engagement, in order to secure wider understanding and acceptance of the marine renewables agenda; Develop and deliver a range of case studies, tool kits and resources that will assist other regions. To facilitate this, the project is broken down into a series of work packages: WP1: Project Preparation; WP2: Project Management; WP3: Technology Support; WP4: Policy Issues; WP5: Sustainable Economic Development; WP6: Stakeholder Engagement; WP7: Communication and DisseminationThis document is intended to provide an introduction into the international, national and regional policy and legislation framework relevant to the deployment of marine renewable energy technologies within the UK, and specifically with a focus upon the South West and the county of Cornwall and its neighbouring Isles of Scilly. Within the context and scope of this document, devices that utilize wave, tidal stream, and floating wind within the marine environment are included within the definition of ‘marine renewable energy devices’ however limited focus is also given to offshore fixed wind turbines as it is recognised that, (although outside of the scope and context of this document and at a much further stage of technology maturity) there are many complimentarities between these technology groupings

Possible uses of gamma-rays at future intense positron sources

The baseline design of the ILC (International Linear Collider) positron source requires the production of an intense flux of gamma rays. In this paper we present an investigation of using the gamma ray beam of the ILC for additional applications, including nuclear physics. As a result of changing the collimator shape, as well as the parameters of the undulator magnets, we obtained spectra from numerical simulations using the HUSR/GSR software package. We present results from simulations and a discussion of possible future investigations in this paper