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  1. Book ; Thesis: Entwicklung einer Methode zur Verifizierung des Coreinventars und des bestimmungsgemäßen Betriebes von kleinen und mittelgroßen Forschungsreaktoren

    Filges, Uwe

    2004  

    Author's details Uwe Filges
    Language German
    Size VIII, 134 S., graph. Darst.
    Document type Book ; Thesis
    Thesis / German Habilitation thesis Techn. Univ., Diss.--Dresden, 2004
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  2. Article ; Online: Commissioning of the novel Continuous Angle Multi-energy Analysis spectrometer at the Paul Scherrer Institut.

    Lass, Jakob / Jacobsen, Henrik / Krighaar, Kristine M L / Graf, Dieter / Groitl, Felix / Herzog, Frank / Yamada, Masako / Kägi, Christian / Müller, Raphael A / Bürge, Roman / Schild, Marcel / Lehmann, Manuel S / Bollhalder, Alex / Keller, Peter / Bartkowiak, Marek / Filges, Uwe / Greuter, Urs / Theidel, Gerd / Rønnow, Henrik M /
    Niedermayer, Christof / Mazzone, Daniel G

    The Review of scientific instruments

    2023  Volume 94, Issue 2, Page(s) 23302

    Abstract: We report on the commissioning results of the cold neutron multiplexing secondary spectrometer CAMEA (Continuous Angle Multi-Energy Analysis) at the Swiss Spallation Neutron Source at the Paul Scherrer Institut, Switzerland. CAMEA is optimized for ... ...

    Abstract We report on the commissioning results of the cold neutron multiplexing secondary spectrometer CAMEA (Continuous Angle Multi-Energy Analysis) at the Swiss Spallation Neutron Source at the Paul Scherrer Institut, Switzerland. CAMEA is optimized for efficient data acquisition of scattered neutrons in the horizontal scattering plane, allowing for detailed and rapid mapping of low-energy excitations under extreme sample environment conditions.
    Language English
    Publishing date 2023-03-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/5.0128226
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 4' 46/112: Show issues

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  3. Article ; Online: Visualization and quantification of inhomogeneous and anisotropic magnetic fields by polarized neutron grating interferometry.

    Valsecchi, Jacopo / Harti, Ralph P / Raventós, Marc / Siegwart, Muriel D / Morgano, Manuel / Boillat, Pierre / Strobl, Markus / Hautle, Patrick / Holitzner, Lothar / Filges, Uwe / Treimer, Wolfgang / Piegsa, Florian M / Grünzweig, Christian

    Nature communications

    2019  Volume 10, Issue 1, Page(s) 3788

    Abstract: The intrinsic magnetic moment of a neutron, combined with its charge neutrality, is a unique property which allows the investigation of magnetic phenomena in matter. Here we present how the utilization of a cold polarized neutron beam in neutron grating ... ...

    Abstract The intrinsic magnetic moment of a neutron, combined with its charge neutrality, is a unique property which allows the investigation of magnetic phenomena in matter. Here we present how the utilization of a cold polarized neutron beam in neutron grating interferometry enables the visualization and characterization of magnetic properties on a microscopic scale in macroscopic samples. The measured signal originates from the phase shift induced by the magnetic potential. Our method enables the detection of previously inaccessible magnetic field gradients, in the order of T cm
    Language English
    Publishing date 2019-08-22
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-019-11590-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: CAMEA--A novel multiplexing analyzer for neutron spectroscopy.

    Groitl, Felix / Graf, Dieter / Birk, Jonas Okkels / Markó, Márton / Bartkowiak, Marek / Filges, Uwe / Niedermayer, Christof / Rüegg, Christian / Rønnow, Henrik M

    The Review of scientific instruments

    2016  Volume 87, Issue 3, Page(s) 35109

    Abstract: The analyzer detector system continuous angle multiple energy analysis will be installed on the cold-neutron triple-axis spectrometer RITA-2 at SINQ, PSI. CAMEA is optimized for efficiency in the horizontal scattering plane enabling rapid and detailed ... ...

    Abstract The analyzer detector system continuous angle multiple energy analysis will be installed on the cold-neutron triple-axis spectrometer RITA-2 at SINQ, PSI. CAMEA is optimized for efficiency in the horizontal scattering plane enabling rapid and detailed mapping of excitations. As a novelty the design employs a series of several sequential upward scattering analyzer arcs. Each arc is set to a different, fixed, final energy and scatters neutrons towards position sensitive detectors. Thus, neutrons with different final energies are recorded simultaneously over a large angular range. In a single data-acquisition many entire constant-energy lines in the horizontal scattering plane are recorded for a quasi-continuous angular coverage of about 60°. With a large combined coverage in energy and momentum, this will result in a very efficient spectrometer, which will be particularly suited for parametric studies under extreme conditions with restrictive sample environments (high field magnets or pressure cells) and for small samples of novel materials. In this paper we outline the concept and the specifications of the instrument currently under construction.
    Language English
    Publishing date 2016-03
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/1.4943208
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 4' 46/112: Show issues

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  5. Article ; Online: Recent progress on HYSPEC, and its polarization analysis capabilities

    Winn Barry / Filges Uwe / Garlea V. Ovidiu / Graves-Brook Melissa / Hagen Mark / Jiang Chenyang / Kenzelmann Michel / Passell Larry / Shapiro Stephen M. / Tong Xin / Zaliznyak Igor

    EPJ Web of Conferences, Vol 83, p

    2015  Volume 03017

    Abstract: HYSPEC is a high-intensity, direct-geometry time-of-flight spectrometer at the Spallation Neutron Source, optimized for measurement of excitations in small single-crystal specimens with optional polarization analysis capabilities. The incident neutron ... ...

    Abstract HYSPEC is a high-intensity, direct-geometry time-of-flight spectrometer at the Spallation Neutron Source, optimized for measurement of excitations in small single-crystal specimens with optional polarization analysis capabilities. The incident neutron beam is monochromated using a Fermi chopper with short, straight blades, and is then vertically focused by Bragg scattering onto the sample position by either a highly oriented pyrolitic graphite (unpolarized) or a Heusler (polarized) crystal array. Neutrons are detected by a bank of 3He tubes that can be positioned over a wide range of scattering angles about the sample axis. HYSPEC entered the user program in February 2013 for unpolarized experiments, and is already experiencing a vibrant research program. Polarization analysis will be accomplished by using the Heusler crystal array to polarize the incident beam, and either a 3He spin filter or a supermirror wide-angle polarization analyser to analyse the scattered beam. The 3He spin filter employs the spin-exchange optical pumping technique. A 60∘ wide angle 3He cell that matches the detector coverage will be used for polarization analysis. The polarized gas in the post-sample wide angle cell is designed to be periodically and automatically refreshed with an adjustable pressure of polarized gas, optically pumped in a separate cell and then transferred to the wide angle cell. The supermirror analyser has 960 supermirror polarizers distributed over 60∘, and has been characterized at the Swiss Spallation Neutron Source. The current status of the instrument and the development of its polarization analysis capabilities are presented.
    Keywords Physics ; QC1-999 ; Science ; Q
    Subject code 535
    Language English
    Publishing date 2015-01-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Book ; Online: Commissioning of the novel Continuous Angle Multi-Energy Analysis Spectrometer at the Paul Scherrer Institut

    Lass, Jakob / Jacobsen, Henrik / Krighaar, Kristine M. L. / Graf, Dieter / Groitl, Felix / Herzog, Frank / Yamada, Masako / Kägi, Christian / Müller, Raphael / Bürge, Roman / Schild, Marcel / Lehmann, Manuel S. / Bollhalder, Alex / Keller, Peter / Bartkowiak, Marek / Filges, Uwe / Greuter, Urs / Theidel, Gerd / Rønnow, Henrik M. /
    Niedermayer, Christof / Mazzone, Daniel G.

    2020  

    Abstract: We report on the commissioning results of the cold neutron multiplexing secondary spectrometer CAMEA (\textbf{C}ontinuous \textbf{A}ngle \textbf{M}ulti-\textbf{E}nergy \textbf{A}nalysis) at the Swiss Spallation Neutron Source (SINQ) at the Paul Scherrer ... ...

    Abstract We report on the commissioning results of the cold neutron multiplexing secondary spectrometer CAMEA (\textbf{C}ontinuous \textbf{A}ngle \textbf{M}ulti-\textbf{E}nergy \textbf{A}nalysis) at the Swiss Spallation Neutron Source (SINQ) at the Paul Scherrer Institut, Switzerland. CAMEA is optimized for an efficient data acquisition of scattered neutrons in the horizontal scattering plane, allowing for detailed and rapid mapping of low-energy excitations under extreme sample environment conditions.
    Keywords Physics - Instrumentation and Detectors ; Condensed Matter - Materials Science
    Publishing date 2020-07-29
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Book ; Online: Experimental signatures of emergent quantum electrodynamics in Pr$_2$Hf$_2$O$_7$

    Sibille, Romain / Gauthier, Nicolas / Yan, Han / Hatnean, Monica Ciomaga / Ollivier, Jacques / Winn, Barry / Filges, Uwe / Balakrishnan, Geetha / Kenzelmann, Michel / Shannon, Nic / Fennell, Tom

    2017  

    Abstract: In a quantum spin liquid, the magnetic moments of the constituent electron spins evade classical long-range order to form an exotic state that is quantum entangled and coherent over macroscopic length scales [1-2]. Such phases offer promising ... ...

    Abstract In a quantum spin liquid, the magnetic moments of the constituent electron spins evade classical long-range order to form an exotic state that is quantum entangled and coherent over macroscopic length scales [1-2]. Such phases offer promising perspectives for device applications in quantum information technologies, and their study can reveal fundamentally novel physics in quantum matter. Quantum spin ice is an appealing proposal of one such state, in which the fundamental ground state properties and excitations are described by an emergent U(1) lattice gauge theory [3-7]. This quantum-coherent regime has quasiparticles that are predicted to behave like magnetic and electric monopoles, along with a gauge boson playing the role of an artificial photon. However, this emergent lattice quantum electrodynamics has proved elusive in experiments. Here we report neutron scattering measurements of the rare-earth pyrochlore magnet Pr$_2$Hf$_2$O$_7$ that provide evidence for a quantum spin ice ground state. We find a quasi-elastic structure factor with pinch points - a signature of a classical spin ice - that are partially suppressed, as expected in the quantum-coherent regime of the lattice field theory at finite temperature. Our result allows an estimate for the speed of light associated with magnetic photon excitations. We also reveal a continuum of inelastic spin excitations, which resemble predictions for the fractionalized, topological excitations of a quantum spin ice. Taken together, these two signatures suggest that the low-energy physics of Pr$_2$Hf$_2$O$_7$ can be described by emergent quantum electrodynamics. If confirmed, the observation of a quantum spin ice ground state would constitute a concrete example of a three-dimensional quantum spin liquid - a topical state of matter which has so far mostly been explored in lower dimensionalities.

    Comment: 15 pages, 3 figures
    Keywords Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Materials Science
    Publishing date 2017-06-12
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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