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  • 1.
    Cherkashyna, N.
    et al.
    European Spallation Source ESS AB, 221 00 Lund, Sweden .
    Kanaki, K.
    European Spallation Source ESS AB, 221 00 Lund, Sweden .
    Kittelmann, T.
    European Spallation Source ESS AB, 221 00 Lund, Sweden .
    Filges, U.
    Paul Scherrer Institute, 5232 Villigen PSI, Switzerland.
    Deen, P.
    European Spallation Source ESS AB, 221 00 Lund, Sweden .
    Herwig, K.
    Instrument and Source Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States .
    Ehlers, G.
    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States.
    Greene, G.
    Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States .
    Carpenter, J.
    Argonne National Laboratory, Argonne, IL 60439, United States .
    Connatser, R.
    European Spallation Source ESS AB, 221 00 Lund, Sweden .
    Hall-Wilton, Richard
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design. European Spallation Source ESS AB, 221 00 Lund, Sweden .
    Bentley, P. M.
    European Spallation Source ESS AB, 221 00 Lund, Sweden .
    High energy particle background at neutron spallation sources and possible solutions2014In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 528, no 1, p. Art. no. 012013-Article in journal (Refereed)
    Abstract [en]

    Modern spallation neutron sources are driven by proton beams ∼ GeV energies. Whereas low energy particle background shielding is well understood for reactors sources of neutrons (∼20 MeV), for high energies (100s MeV to multiple GeV) there is potential to improve shielding solutions and reduce instrument backgrounds significantly. We present initial measured data on high energy particle backgrounds, which illustrate the results of particle showers caused by high energy particles from spallation neutron sources. We use detailed physics models of different materials to identify new shielding solutions for such neutron sources, including laminated layers of multiple materials. In addition to the steel and concrete, which are used traditionally, we introduce some other options that are new to the neutron scattering community, among which there are copper alloys as used in hadronic calorimeters in high energy physics laboratories. These concepts have very attractive energy absorption characteristics, and simulations predict that the background suppression could be improved by one or two orders of magnitude. These solutions are expected to be great benefit to the European Spallation Source, where the majority of instruments are potentially affected by high energy backgrounds, as well as to existing spallation sources.

  • 2.
    Dijulio, D. D.
    et al.
    European Spallation Source ERIC, Lund; Division of Nuclear Physics, Lund University, Lund.
    Cherkashyna, N.
    European Spallation Source ERIC, Lund.
    Scherzinger, J.
    European Spallation Source ERIC, Lund; Division of Nuclear Physics, Lund University, Lund.
    Khaplanov, A.
    European Spallation Source ERIC, Lund.
    Pfeiffer, D.
    European Spallation Source ERIC, Lund; CERN, Geneva 23, Switzerland.
    Cooper-Jensen, C. P.
    European Spallation Source ERIC, Lund; Department of Physics and Astronomy, Uppsala University, Uppsala.
    Fissum, K. G.
    European Spallation Source ERIC, Lund; Division of Nuclear Physics, Lund University, Lund.
    Kanaki, K.
    European Spallation Source ERIC, Lund.
    Kirstein, O.
    European Spallation Source ERIC, Lund; University of Newcastle, Callaghan, NSW, Australia.
    Ehlers, G.
    Quantum Condensed Matter Division, ORNL, Oak Ridge, TN, United States.
    Gallmeier, F. X.
    Instrument and Source Division, ORNL, Oak Ridge, TN, United States.
    Hornbach, D. E.
    Instrument and Source Division, ORNL, Oak Ridge, TN, United States.
    Iverson, E. B.
    Instrument and Source Division, ORNL, Oak Ridge, TN, United States.
    Newby, R. J.
    Instrument and Source Division, ORNL, Oak Ridge, TN, United States.
    Hall-Wilton, Richard J.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design. European Spallation Source ERIC, Lund.
    Bentley, P. M.
    European Spallation Source ERIC, Lund; Department of Physics and Astronomy, Uppsala University, Uppsala.
    Characterization of the radiation background at the Spallation Neutron Source2016In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 746, no 1, article id 012033Article in journal (Refereed)
    Abstract [en]

    We present a survey of the radiation background at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory, TN, USA during routine daily operation. A broad range of detectors was used to characterize primarily the neutron and photon fields throughout the facility. These include a WENDI-2 extended range dosimeter, a thermoscientific NRD, an Arktis 4He detector, and a standard NaI photon detector. The information gathered from the detectors was used to map out the neutron dose rates throughout the facility and also the neutron dose rate and flux profiles of several different beamlines. The survey provides detailed information useful for developing future shielding concepts at spallation neutron sources, such as the European Spallation Source (ESS), currently under construction in Lund, Sweden.

  • 3.
    Högberg, Björn
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering, Physics and Mathematics.
    Olin, Håkan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering, Physics and Mathematics.
    DNA-scaffolded nanoparticle structures2007In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 61, no 1, p. 458-462, article id 092Article in journal (Refereed)
    Abstract [en]

    DNA self-assembly is a powerful route to the production of very small, complex structures. When used in combination with nanoparticles it is likely to become a key technology in the production of nanoelectronics in the future. Previously, demonstrated nanoparticle assemblies have mainly been periodic and highly symmetric arrays, unsuited as building blocks for any complex circuits. With the invention of DNA-scaffolded origami reported earlier this year (Rothemund P W K 2006 Nature 440 (7082) 297–302), a new route to complex nanostructures using DNA has been opened. Here, we give a short review of the field and present the current status of our experiments were DNA origami is used in conjunction with nanoparticles. Gold nanoparticles are functionalized with thiolated single stranded DNA. Strands that are complementary to the gold particle strands can be positioned on the self-assembled DNA-structure in arbitrary patterns. This property should allow an accurate positioning of the particles by letting them hybridize on the lattice. We report on our recent experiments on this system and discuss open problems and future applications.

  • 4.
    Johannisson, Pontus
    et al.
    RISE Acreo AB, Gothenburg, Sweden.
    Ohlsson, Fredrik
    RISE Acreo AB, Gothenburg, Sweden.
    Rusu, Cristina
    RISE Acreo AB, Gothenburg, Sweden.
    Impact-driven up-conversion in piezoelectric MEMS energy harvesters with pulsed excitation2018In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 1052, no 1, article id 012106Article in journal (Refereed)
    Abstract [en]

    The potential of impact-driven frequency up-conversion in a MEMS EH is evaluated using numerical simulations. The investigated design is compared to a conventional cantilever EH in terms of output power and loss rate. The upshifting can lead to significantly increased output power at a similar loss rate but as the time scale for the loss is long, the benefit is limited. This also requires an effective upshifting process. The design of the impact introduces a length scale that must be selected with excitation, gravity, and pre-stress taken into account. This makes this type of EH application-dependent as a non-optimal choice may result in low output power.

  • 5.
    Larsson, S
    et al.
    RISE Acreo AB, Sweden.
    Johannisson, P
    RISE Acreo AB, Sweden.
    Kolev, D
    RISE Acreo AB, Sweden.
    Ohlsson, F
    RISE Acreo AB, Sweden.
    Nik, S
    Silex Microsystems AB; IMEC, Belgium.
    Liljeholm, J
    Silex Microsystems AB; KTH, Sweden.
    Ebefors, T
    Silex Microsystems AB; Spinverse AB, Sweden.
    Rusu, Cristina
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design. RISE Acreo AB, Sweden.
    Simple method for quality factor estimation in resonating MEMS structures2018In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 1052, no 1, article id 012100Article in journal (Refereed)
    Abstract [en]

    The quality factor of a packaged MEMS resonating structure depends on both the packaging pressure and the structure’s proximity to the walls. This type of mechanical constraints, which causes energy dissipation from the structure to the surrounding air, are applicable for oscillating energy harvesters and should be considered in the design process. However, the modelling of energy losses or the measurements of their direct influence inside a packaged chip is not trivial. In this paper, a simple experimental method to quantify the energy loss in an oscillating MEMS structures due to the surrounding air is described together with preliminary results. The main advantage of the method is the ability to characterize the damping contributions under different vacuum and packaging conditions without requiring any packaging of the harvester chip or fabrication of multiple devices with different cavity depths.

  • 6.
    Ohlsson, Fredrik
    et al.
    RISE Acreo AB, Gothenburg, Sweden.
    Johannisson, Pontus
    RISE Acreo AB, Gothenburg, Sweden.
    Rusu, Cristina
    RISE Acreo AB, Gothenburg, Sweden.
    Shape effects in doubly clamped bridge structures at large deflections2018In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 1052, no 1, article id 012109Article in journal (Refereed)
    Abstract [en]

    The shape of a doubly clamped bridge structure depends on its deflection. At large deflections, where the system exhibits nonlinear behaviour, the shape effect becomes significant. We present a general method, based on variational analysis, for computing corrections to the nominal linear regime shape function. The method is used to compute the first non-trivial correction and quantify the corresponding improvement in the large deflection regime. The model obtained is also validated using FEM simulations.

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