9,258 research outputs found
Profile Monitor SEM's for the NuMI Beam at FNAL
The Neutrinos at the Main Injector (NuMI) project will extract 120 GeV
protons from the FNAL Main Injector in 8.56usec spills of 4E13 protons every
1.9 sec. We have designed secondary emission monitor (SEM) detectors to measure
beam profile and halo along the proton beam transport line. The SEM?s are Ti
foils 5um in thickness segmented in either 1?mm or 0.5?mm pitch strips,
resulting in beam loss ~5E-6. We discuss aspects of the mechanical design,
calculations of expected beam heating, and results of a beam test at the 8 GeV
transport line to MiniBoone at FNAL.Comment: to appear in proceedings of 11th Beam Instrumentation Workshop, Oak
Ridge, T
Entropic gravity, minimum temperature, and modified Newtonian dynamics
Verlinde's heuristic argument for the interpretation of the standard
Newtonian gravitational force as an entropic force is generalized by the
introduction of a minimum temperature (or maximum wave length) for the
microscopic degrees of freedom on the holographic screen. With the simplest
possible setup, the resulting gravitational acceleration felt by a test mass m
from a point mass M at a distance R is found to be of the form of the modified
Newtonian dynamics (MOND) as suggested by Milgrom. The corresponding MOND-type
acceleration constant is proportional to the minimum temperature, which can be
interpreted as the Unruh temperature of an emerging de-Sitter space. This
provides a possible explanation of the connection between local MOND-type
two-body systems and cosmology.Comment: 12 pages, v6: published versio
Drought risk and drought risk management strategies among Austrian crop farmers
So far, droughts have not been a main concern for high-income countries, including Austria. However, the effects of climate change will likely cause droughts to occur more frequently and with greater severity also in Austria particularly (Hochrainer-Stigler et al. 2018). Particularly Austrian farmers have frequently been affected by drought over the past decade, and scientific research predicts a continuation of this trend. Targeted efforts at relevant policymaking have been increasing in parallel in different sectors and domains, however, no concerted drought risk management strategies – neither for the agricultural sector nor at a cross sectoral level – are available.
This working paper presents a survey that we designed and conducted to investigate Austrian cropping farmers’ perceptions of and experiences with drought risk and its management. The aim was to inform policy making at different levels to design both targeted and integrated drought risk management strategies. The working paper includes a description of the data collection process and the survey design, as well as a detailed characterization of the sample and the data collected. This document thus highlights the main findings of the survey and serves as a background document for further, more detailed analysis.
The work presented is part of the ACRP-funded FARM project. For more information on the project, please consult www.iiasa.ac.at/farm. For more information on the conceptual context as well as Austrian governance landscape for drought see Hanger-Kopp and Palka 202
Modulation of the local density of states within the -density wave theory in the underdoped cuprates
The low temperature scanning tunneling microscopy spectra in the underdoped
regime is analyzed from the perspective of coexisting -density wave and
d-wave superconducting states. The calculations are carried out in the presence
of a low concentration of unitary impurities and within the framework of the
fully self-consistent Bogoliubov-de Gennes theory, which allows local
modulations of the magnitude of the order parameters in response to the
impurities. Our theory captures the essential aspects of the experiments in the
underdoped BSCCO at very low temperatures.Comment: 4 pages, 4 eps figures, RevTex4. New added material as well as
reference
Two experiments for the price of one? -- The role of the second oscillation maximum in long baseline neutrino experiments
We investigate the quantitative impact that data from the second oscillation
maximum has on the performance of wide band beam neutrino oscillation
experiments. We present results for the physics sensitivities to standard three
flavor oscillation, as well as results for the sensitivity to non-standard
interactions. The quantitative study is performed using an experimental setup
similar to the Fermilab to DUSEL Long Baseline Neutrino Experiment (LBNE). We
find that, with the single exception of sensitivity to the mass hierarchy, the
second maximum plays only a marginal role due to the experimental difficulties
to obtain a statistically significant and sufficiently background-free event
sample at low energies. This conclusion is valid for both water Cherenkov and
liquid argon detectors. Moreover, we confirm that non-standard neutrino
interactions are very hard to distinguish experimentally from standard
three-flavor effects and can lead to a considerable loss of sensitivity to
\theta_{13}, the mass hierarchy and CP violation.Comment: RevTex 4.1, 23 pages, 10 figures; v2: Typos corrected, very minor
clarifications; matches published version; v3: Fixed a typo in the first
equation in sec. III
Editorial: E-Learning-Strategien fĂĽr die Hochschullehre
27.04.2015Â | Sabine Seufert (St. Gallen), Martin Ebner, Michael Kopp (Graz) & Bettina Schlass (Amsterdam
Entanglement crossover close to a quantum critical point
We discuss the thermal entanglement close to a quantum phase transition by
analyzing the concurrence for one dimensional models in the quantum Ising
universality class. We demonstrate that the entanglement sensitivity to thermal
and to quantum fluctuations obeys universal --scaling behaviour. We
show that the entanglement, together with its criticality, exhibits a peculiar
universal crossover behaviour.Comment: 12 pages; 5 figures (eps). References added; to be published in
Europhysics Letter
Considerations for an Ac Dipole for the LHC
Following successful experience at the BNL AGS, FNAL Tevatron, and CERN SPS,
an AC Dipole will be adopted at the LHC for rapid measurements of ring optics.
This paper describes some of the parameters of the AC dipole for the LHC,
scaling from performance of the FNAL and BNL devices.Comment: proceedings of the 2007 Particle Accelerator Conferenc
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