# Published Articles

2013-06-18
11:19
 Uppsala High Power Test Stand for ESS Spoke Cavities / Yogi, RA (Uppsala U.) ; Rydberg, A (Uppsala U.) ; Dancila, D (Uppsala U.) ; Gajewski, K (Uppsala U., TSL) ; Hermansson, L (Uppsala U.) ; Noor, M (Uppsala U.) ; Wedberg, R (Uppsala U., TSL) ; Santiago-Kern, R (Uppsala U.) ; Ekelöf, T (Uppsala U.) ; Lofnes, T (Uppsala U., TSL) et al. The European Spallation Source (ESS) is one of the world’s most powerful neutron source. The ESS linac will accelerate 50mA pulse current of protons to 2.5GeV in 2.86 ms long pulses at a repetition rate of 14 Hz. [...] 2012 - 3 p. - Published in : Conf. Proc.: C120909 (2012) , pp. TUPB108 External link: Published version from JaCoW In : 26th International Linear Accelerator Conference, Tel Aviv, Israel, 9 - 14 Sep 2012, pp.711-713

2013-06-18
09:25
 Assembly and RF Tuning of the Linac4 RFQ at CERN / Rossi, C (CERN) ; Dallocchio, A (CERN) ; Hansen, J (CERN) ; Lallement, JB (CERN) ; Lombardi, AM (CERN) ; Pugnat, D (CERN) ; Vandoni, G (CERN) ; Timmins, M (CERN) ; Vretenar, M (CERN) ; Mathot, S (CERN) et al. The fabrication of Linac4 is progressing at CERN with the goal of making a 160 MeV H- beam available to the LHC injection chain as from 2015. In the Linac4 the first stage of beam acceleration, after its extraction from the ion source, is provided by a Radiofrequency Quadrupole accelerator (RFQ), operating at the RF frequency of 352.2 MHz and which accelerates the ion beam to the energy of 3 MeV. [...] 2012 - 3 p. - Published in : Conf. Proc.: C120909 (2012) , pp. THPB038 External link: Published version from JaCoW In : 26th International Linear Accelerator Conference, Tel Aviv, Israel, 9 - 14 Sep 2012, pp.939-941

2013-06-18
09:03
 Scattering of H- Stripped Electrons from SEM Grids and Wire Scanners at the CERN LINAC4 / Cheymol, B (CERN) ; Chevallay, E (CERN) ; Duraffourg, M (CERN) ; Focker, GJ (CERN) ; Roncarolo, F (CERN) ; Raich, U (CERN) ; Hessler, C (CERN) ; Vuitton, C (CERN) ; Zocca, F (CERN) At the CERN LINAC4, wire grids and scanners will be used to characterize the H− beam transverse proﬁles from 45 keV to 160 MeV. The wire signal will be determined by the balance between secondary emission and number of charges stopped in the wire, which will depend on the wire material and diameter, the wire polarization and the beam energy. [...] 2012 - 3 p. - Published in : Conf. Proc.: C120909 (2012) , pp. TUPB041 External link: Published version from JaCoW In : 26th International Linear Accelerator Conference, Tel Aviv, Israel, 9 - 14 Sep 2012, pp.567-569

2013-06-18
04:10
 Revisiting literature observations on photodarkening in Yb3+doped fiber considering the possible presence of Tm impurities / Peretti, Romain (INL) ; Gonnet, Cedric (LPCML) ; Jurdyc, Anne-Marie (LPCML) Ytterbium (Yb) doped fiber lasers are known to be affected by the creation of color centers during lasing (socalled photodarkening (PD)). In a previous work, this defect creation was investigated from a spectroscopic point of view, showing the presence of traces (ppb) of thulium (Tm) in the Yb doped fiber. [...] arXiv:1306.3834.- 2013 - Published in : J. Appl. Phys. 112 (2012) 093511 External link: Preprint

2013-06-18
04:10
 Modal approach for tailoring the absorption in a photonic crystal membrane / Peretti, Romain (INL) ; Gomard, Guillaume (INL) ; Seassal, Christian (INL, ECL) ; Letartre, Xavier (INL) ; Drouard, Emmanuel (INL, ECL) In this paper, we propose a method for tailoring the absorption in a photonic crystal membrane. For that purpose, we first applied Time Domain Coupled Mode Theory to such a subwavelength membrane and demonstrated that 100% resonant absorption can be reached even for a symmetric membrane, if degenerate modes are involved. [...] arXiv:1306.3832.- 2013 - Published in : J. Appl. Phys. 111 (2012) 123114 External link: Preprint

2013-06-18
04:10
 Redefining the Attraction Measure, Scaling Exponent and Impedance Function of the Gravity Model / Chen, Yanguang ; Xu, Feng The attraction measure, scaling exponent, and impedance function of the gravity model are redefined using the concepts from fractals and spatial complexity. Firstly, the attraction measure of spatial interaction in human systems is defined by the product of traffic inflow and outflow. [...] arXiv:1306.3822.- 2013 - 24 p. - Published in : Far East Journal of Dynamical Systems: 1 (2009) , pp. 3 External link: Preprint

2013-06-18
04:10
 Fourier Analysis of an Expanded Gravity Model for Spatio-Temporal Interactions / Chen, Yanguang ; Wang, Fahui Fourier analysis and cross-correlation function are successfully applied to improving the conventional gravity model of interaction between cities by introducing a time variable to the attraction measures (e.g., city sizes). The traditional model assumes spatial interaction as instantaneous, while the new model considers the interaction as a temporal process and measures it as an aggregation over a period of time. [...] arXiv:1306.3820.- 2013 - 21 p. - Published in : Far East Journal of Dynamical Systems: 1 (2008) , pp. 3 External link: Preprint

2013-06-18
04:10
 Investigations of afterpulsing and detection efficiency recovery in superconducting nanowire single-photon detectors / Burenkov, Viacheslav ; Xu, He ; Qi, Bing ; Hadfield, Robert H ; Lo, Hoi-Kwong We report on the observation of a non-uniform dark count rate in Superconducting Nanowire Single Photon Detectors (SNSPDs), specifically focusing on an afterpulsing effect present when the SNSPD is operated at a high bias current regime. The afterpulsing exists for real detection events (triggered by input photons) as well as for dark counts (no laser input). [...] arXiv:1306.3749.- 2013 - Published in : J. Appl. Phys. 113 (2013) 213102 External link: Preprint

2013-06-18
04:10
 An approach to first principles electronic structure calculation by symbolic-numeric computation / Kikuchi, Akihito This article is an introduction to a new approach to first principles electronic structure calculation. The starting point is the Hartree-Fock-Roothaan equation, in which molecular integrals are approximated by polynomials by way of Taylor expansion with respect to atomic coordinates and other variables. [...] arXiv:1306.3714.- 2013 External link: Preprint

2013-06-18
04:10
 Low-frequency surface plasmon excitations in multicoaxial negative-index metamaterial cables / Kushwaha, M S ; Djafari-Rouhani, B By using an elegant response function theory, which does not require matching of the messy boundary conditions, we investigate the surface plasmon excitations in the multicoaxial cylindrical cables made up of negative-index metamaterials. The multicoaxial cables with {\em dispersive} metamaterial components exhibit rather richer (and complex) plasmon spectrum with each interface supporting two modes: one TM and the other TE for (the integer order of the Bessel function) $m \ne 0$. [...] arXiv:1306.3573.- 2013 External link: Preprint