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  • 1. Abbondanno, U
    et al.
    Carlson, Per
    KTH, Superseded Departments, Physics.
    Peskov, Vladimir
    KTH, Superseded Departments, Physics.
    Zanini, L
    et al.,
    New experimental validation of the pulse height weighting technique for capture cross-section measurements2004In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, Vol. 521, no 2-3, 454-467 p.Article in journal (Refereed)
    Abstract [en]

    The accuracy of the pulse height weighting technique for the determination of neutron capture cross-sections is investigated. The technique is applied to measurements performed with C6D6 liquid scintillation detectors of two different types using capture samples of various dimensions. The data for well-known (n, gamma) resonances are analyzed using weighting functions obtained from Monte Carlo simulations of the experimental set-up. Several causes of systematic deviation are identified and their effect is quantified. In all the cases measured the reaction yield agrees with the standard value within 2%.

  • 2.
    Adamsson, Carl
    et al.
    KTH, Superseded Departments, Physics.
    Anglart, Henryk
    KTH, Superseded Departments, Physics.
    Dryout predictions in bwr fuel assemblies with spacers2004In: Proceedings of the Sixth International Conference on Nuclear Thermal-Hydraulics, Operation and Safety, 2004Conference paper (Refereed)
    Abstract [en]

    A new spacer model has been implemented into the subchannel code Mona-3 and validated against dryout experiments in various rod bundles with different number of spacers and different spacer designs. The spacer-induced deposition enhancement is captured by proper modeling of the turbulence intensity downstream of a spacer.

    The Mona-3 code with the new spacer model captures spacer effects in a correct manner. Both the effect of the number of spacers and the effect of the spacer design are predicted correctly. In particular, the critical power difference between 24-rod bundles with 6 and with 7 spacers is measured to be larger than the difference between 25-rod bundles with 6 and with 7 spacers. This experimental finding is well captured with the Mona-3 code with the present spacer model.

  • 3. Adriani, O.
    et al.
    Ambriola, M.
    Barbarino, G.
    Barbier, L. M.
    Pearce, Mark
    KTH, Superseded Departments, Physics.
    Zampa, N.
    et al,
    The PAMELA experiment on satellite and its capability in cosmic rays measurements2002In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, Vol. 478, no 02-jan, 114-118 p.Article in journal (Refereed)
    Abstract [en]

    The PAMELA equipment will be assembled in 2001 and installed on board the Russian satellite Resurs. PAMELA is conceived mainly to study the antiproton and positron fluxes in cosmic rays up to high energy (190 GeV for (p) over bar and 270 GeV for e(+)) and to search antinuclei, up to 30 GeV/n, with a sensitivity of 10(-7) in the He/He ratio. The PAMELA telescope consists of. a magnetic spectrometer made up of a permanent magnet system equipped with double sided microstrip silicon detectors a transition radiation detector made up of active layers of proportional straw tubes interleaved with carbon fibre radiators; and a silicon-tungsten imaging calorimeter made up of layers of tungsten absorbers and silicon detector planes. A time-of-flight system and anti-coincidence counters complete the PAMELA equipment. In the past years, tests have been done on each subdetector of PAMELA; the main results are presented and their implications on the anti-particles identification capability in cosmic rays are discussed here.

  • 4. Agate, B.
    et al.
    Rafailov, E. U.
    Sibbett, W.
    Saltiel, S. M.
    Koynov, K.
    Tiihonen, Mikael
    KTH, Superseded Departments, Physics.
    Wang, Shunhua
    KTH, Superseded Departments, Physics.
    Laurell, Fredrik
    KTH, Superseded Departments, Physics.
    Battle, P.
    Fry, T.
    Roberts, T.
    Noonan, E.
    Portable ultrafast blue light sources2004In: OSA Trends Opt. Photonics Series, 2004, 651-652 p.Conference paper (Refereed)
    Abstract [en]

    An effective means of achieving a portable, ultrafast blue-light source using a variety of nonlinear media is demonstrated. We investigate the relative merits of aperiodically-poled bulk and waveguide nonlinear crystals in comparison to periodically-poled structures.

  • 5. Agate, B.
    et al.
    Rafailov, E. U.
    Sibbett, W.
    Saltiel, S. M.
    Koynov, K.
    Tiihonen, Mikael
    KTH, Superseded Departments, Physics.
    Wang, Shunhua
    KTH, Superseded Departments, Physics.
    Laurell, Fredrik
    KTH, Superseded Departments, Physics.
    Battle, P.
    Fry, T.
    Roberts, T.
    Noonan, E.
    Portable ultrafast blue light sources designed with frequency doubling in KTP and KNbO32004In: IEEE Journal of Selected Topics in Quantum Electronics, ISSN 1077-260X, E-ISSN 1558-4542, Vol. 10, no 6, 1268-1276 p.Article in journal (Refereed)
    Abstract [en]

    We demonstrate an effective means of achieving compact, truly portable, and entirely self-contained ultrafast blue light sources. Using a variety of nonlinear media to achieve simple second-harmonic generation of a femtosecond Cr:LiSAF laser, we investigate the relative merits of aperiodically poled bulk and waveguide nonlinear crystals in comparison to periodically poled structures. Such a compact and convenient source of ultrashort laser pulses in the blue spectral region could be of great interest for on-site applications spanning a host of disciplines, such as biomedical imaging, optical micromanipulation, and high-resolution spectroscopy.

  • 6. Agren, P.
    et al.
    Andersson, K.
    Haviland, David B.
    KTH, Superseded Departments, Physics.
    Kinetic inductance and Coulomb blockade in one dimensional Josephson junction arrays2001In: Journal of Low Temperature Physics, ISSN 0022-2291, E-ISSN 1573-7357, Vol. 124, no 02-jan, 291-304 p.Article in journal (Refereed)
    Abstract [en]

    One dimensional Josephson junction arrays have been fabricated and current-voltage characteristics (IVC) have been measured at cryogenic temperatures. The arrays were fabricated in a SQUID-geometry which allowed an in. situ tuning of thc Josephson energy by application of a magnetic field. The IVC of thc arrays shows a clear Coulomb blockade state. In the Coulomb blockade regime the IVC are hysteretic, The array is modeled using a Serial resistive-inductive-junction model which is able to qualitatively explain the IVC. In this model an inductance of the order of 0.1-10 mH per Junction is needed to account for the hysteresis. Kinetic inductance. stemming from the inertia of the Cooper pairs. gives the correct order of magnitude. The problem of self-heating is also discussed as an alternative explanation of the hysteresis.

  • 7. Agren, P.
    et al.
    Johansson, J.
    Andersson, K.
    Haviland, David B.
    KTH, Superseded Departments, Physics.
    Hysteretic current-voltage characteristics and Coulomb blockade in 1D-arrays of Josephson junctions2000In: Physica. B, Condensed matter, ISSN 0921-4526, Vol. 280, no 04-jan, 414-415 p.Article in journal (Refereed)
    Abstract [en]

    The IV characteristics (IVC) of 1D-arrays of small capacitance Josephson junctions with E-C similar to E-J have been measured. The IVC show Coulomb blockade of Cooper pair tunneling and exhibit a pronounced hysteresis which appears to be dual to the well-known resistively shunted junction behavior of ordinary Josephson junctions. A dual serially resistive junction model is used to qualitatively explain the measured data.

  • 8.
    Ahlgren, Mats
    KTH, Superseded Departments, Physics.
    Studies of quantum interference effects in icosahedral quasicrystals and amorphous superconductors1997Doctoral thesis, comprehensive summary (Other scientific)
  • 9. Akhmadaliev, S.
    et al.
    Albiol, F.
    Amaral, P.
    Berglund, S.
    Lund-Jensen, Bengt
    KTH, Superseded Departments, Physics.
    Lundquist, J.
    Sellden, B.
    Soderqvist, J.
    Zolnierowski, Y. P.
    et al,
    Results from a new combined test of an electromagnetic liquid argon calorimeter with a hadronic scintillating-tile calorimeter2000In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, Vol. 449, no 3, 461-477 p.Article in journal (Refereed)
    Abstract [en]

    A new combined test of an electromagnetic liquid argon accordion calorimeter and a hadronic scintillating-tile calorimeter was carried out at the CERN SPS. These devices are prototypes of the barrel calorimeter of the future ATLAS experiment at the LHC. The energy resolution of pions in the energy range from 10 to 300 GeV at an incident angle a of about 12 degrees is well described by the expression sigma/E = ((41.9 +/- 1.6)%/root E + (1.8 +/- 0.1)%)circle plus(1.8 +/- 0.1)/E, where E is in GeV. The response to electrons and muons was evaluated. Shower profiles, shower leakage and the angular resolution of hadronic showers were also studied. Results are compared with those from the previous beam test.

  • 10. Akhmadaliev, S.
    et al.
    Amaral, P.
    Ambrosini, G.
    Amorim, A.
    Anderson, K.
    Johansson, E.
    Lund-Jensen, Bengt
    KTH, Superseded Departments, Physics.
    Soderqvist, J.
    Zolnierowski, Y. P.
    et al,
    Hadron energy reconstruction for the ATLAS calorimetry in the framework of the non-parametrical method2002In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, Vol. 480, no 03-feb, 508-523 p.Article in journal (Refereed)
    Abstract [en]

    This paper discusses hadron energy reconstruction for the ATLAS barrel prototype combined calorimeter (consisting of a lead-liquid argon electromagnetic part and an iron-scintillator hadronic part) in the framework of the non-parametrical method. The non-parametrical method utilizes only the known e/h ratios and the electron calibration constants and does not require the determination of any parameters by a minimization technique. Thus, this technique lends itself to an easy use in a first level trigger. The reconstructed mean values of the hadron energies are within +/-1% of the true values and the fractional energy resolution is [(58+/-3)%/rootE+(2.5+/-0.3)%]circle plus(1.7+/-0.2)/E. The value of the e/h ratio obtained for the electromagnetic compartment of the combined calorimeter is 1.74+/-0.04 and agrees with the prediction that e/h > 1.66 for this electromagnetic calorimeter. Results of a study of the longitudinal hadronic shower development are also presented. The data have been taken in the H8 beam line of the CERN SPS using pions of energies from 10 to 300 GeV.

  • 11. Akhmedov, Evgeny
    et al.
    Huber, Patrick
    Lindner, Manfred
    Ohlsson, Tommy
    KTH, Superseded Departments, Physics.
    T violation in neutrino oscillations in matter2001In: Nuclear Physics B, ISSN 0550-3213, Vol. 608, no 02-jan, 394-422 p.Article in journal (Refereed)
    Abstract [en]

    We consider the interplay of fundamental and matter-induced T violation effects in neutrino oscillations in matter. After discussing the general features of these effects we derive a simple approximate analytic expression for the T-violating probability asymmetry DeltaP(ab)(T) for three-flavour neutrino oscillations in a matter with an arbitrary density profile in terms of the two-flavour neutrino amplitudes. Explicit examples are given for the cases of a two-layer medium and for the adiabatic Emit in the general case. We then discuss implications of the obtained results for long baseline experiments. We show, in particular, that asymmetric matter effects cannot hinder the determination of the fundamental CP- and T-violating phase delta (CP) in the long baseline experiments as far as the error in this determination is larger than 1% at 99% CL. Since there are no T-violating effects in the two-flavour case, and in the limits of vanishing theta (13) or Deltam(21)(2) the three-flavour neutrino oscillations effectively reduce to the two-flavour ones, studying the T-violating asymmetries ApT ab can in principle provide us with a complementary means of measuring theta (13) and Deltam(21)(2).

  • 12. Akhmedov, Evgeny K.
    et al.
    Johansson, Robert
    KTH, Superseded Departments, Physics.
    Lindner, Manfred
    Ohlsson, Tommy
    KTH, Superseded Departments, Physics.
    Schwetz, Thomas
    Series expansions for three-flavor neutrino oscillation probabilities in matter2004In: Journal of High Energy Physics (JHEP), ISSN 1029-8479, E-ISSN 1126-6708, Vol. 2004, no 04, 078- p.Article in journal (Refereed)
    Abstract [en]

    We present a number of complete sets of series expansion formulas for neutrino oscillation probabilities in matter of constant density for three flavors. In particular, we study expansions in the mass hierarchy parameter alpha = Deltam(21)(2)/Deltam(31)(2) and mixing parameter s(13) = sin theta(13) up to second order and expansions only in alpha and only in s(13) up to first order. For each type of expansion we also present the corresponding formulas for neutrino oscillations in vacuum. We perform a detailed analysis of the accuracy of the different sets of series expansion formulas and investigate which type of expansion is most accurate in different regions of the parameter space spanned by the neutrino energy E, the baseline length L, and the expansion parameters alpha and s(13). We also present the formulas for series expansions in alpha and in s(13) up to first order for the case of arbitrary matter density profiles. Furthermore, it is shown that in general all the 18 neutrino and antineutrino oscillation probabilities can be expressed through just two independent probabilities.

  • 13. Albert, Jacques
    et al.
    Fokine, Mikael
    KTH, Superseded Departments, Physics.
    Margulis, Walter
    KTH, Superseded Departments, Physics.
    Grating formation in pure silica-core fibers2002In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 27, no 10, 809-811 p.Article in journal (Refereed)
    Abstract [en]

    Strong grating formation in pure silica-core fibers by use of 193-nm ArF-laser radiation is reported. Unsaturated refractive-index changes of Deltan similar to 0.3 X 10(-3) were observed in nontreated fiber, and changes of Deltan similar to 0.5 X 10(-3) were observed in fibers with a high hydroxyl concentration. Possible mechanisms of photosensitivity in pure silica-core fibers are discussed.

  • 14. Algora, A.
    et al.
    de Angelis, G.
    Brandolini, F.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Menegazzo, R.
    Thomas, H. G.
    Ur, C. A.
    et al,
    Pronounced shape change induced by quasiparticle alignment2000In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 6103, no 3Article in journal (Refereed)
    Abstract [en]

    Mean lifetimes of high-spin states of Kr-74 have been determined using the Doppler-shift attenuation method. The high-spin states were studied using the Ca-40(Ca-40, alpha 2p) reaction at a beam energy of 160 MeV with the GASP gamma-ray spectrometer. The ground-state band and negative parity side band show the presence of three different configurations in terms of transitional quadrupole deformations. A dramatic shape change was found along the ground-state band after the S-band crossing. The deduced quadrupole deformation changes are well reproduced by cranked Woods-Saxon Strutinsky calculations.

  • 15. Al-Khalili, A
    et al.
    Thomas, R
    Ehlerding, A
    Hellberg, F
    Geppert, W D
    Zhaunerchyk, V
    af Ugglas, M
    Larsson, M
    Uggerud, E
    Vedde, J
    Adlhart, C
    Semaniak, J
    Kaminska, M
    Zubarev, R A
    Kjeldsen, F
    Andersson, P U
    Österdahl, Fabian
    KTH, Superseded Departments, Physics.
    Bednarska, V A
    Paal, A
    Dissociative recombination cross section and branching ratios of protonated dimethyl disulfide and N-methylacetamide2004In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 121, no 12, 5700-5708 p.Article in journal (Refereed)
    Abstract [en]

    Dimethyl disulfide (DMDS) and N-methylacetamide are two first choice model systems that represent the disulfide bridge bonding and the peptide bonding in proteins. These molecules are therefore suitable for investigation of the mechanisms involved when proteins fragment under electron capture dissociation (ECD). The dissociative recombination cross sections for both protonated DMDS and protonated N-methylacetamide were determined at electron energies ranging from 0.001 to 0.3 eV. Also, the branching ratios at 0 eV center-of-mass collision energy were determined. The present results give support for the indirect mechanism of ECD, where free hydrogen atoms produced in the initial fragmentation step induce further decomposition. We suggest that both indirect and direct dissociations play a role in ECD.

  • 16. Aman, K.
    et al.
    Lindahl, E.
    Edholm, Olle
    KTH, Superseded Departments, Physics.
    Hakansson, P.
    Westlund, P. O.
    Structure and dynamics of interfacial water in an L-alpha phase lipid bilayer from molecular dynamics simulations2003In: Biophysical Journal, ISSN 0006-3495, E-ISSN 1542-0086, Vol. 84, no 1, 102-115 p.Article in journal (Refereed)
    Abstract [en]

    Based on molecular dynamics simulations, an analysis of structure and dynamics is performed on interfacial water at a liquid crystalline dipalmitoylphosphatidycholine/water system. Water properties relevant for understanding NMR relaxation are emphasized. The first and second rank orientational order parameters of the water O-H bonds were calculated, where the second rank order parameter is in agreement with experimental determined quadrupolar splittings. Also, two different interfacial water regions (bound water regions) are revealed with respect to different signs of the second rank order parameter. The water reorientation correlation function reveals a mixture of fast and slow decaying parts. The fast (ps) part of the correlation function is due to local anisotropic water reorientation whereas the much slower part is due to more complicated processes including lateral diffusion along the interface and chemical exchange between free and bound water molecules. The 100-ns-long molecular dynamics simulation at constant pressure (1 atm) and at a temperature of 50degreesC of 64 lipid molecules and 64 x 23 water molecules lack a slow water reorientation correlation component in the ns time scale. The (H2O)-H-2 powder spectrum of the dipalmitoylphosphatidycholine/water system is narrow and consequently, the NMR relaxation time T-2 is too short compared to experimental results.

  • 17.
    Aman, Ken
    et al.
    Umeå University.
    Lindahl, Erik
    KTH, Superseded Departments, Physics.
    Edholm, Olle
    KTH, Superseded Departments, Physics.
    Håkansson, Pär
    Umeå University.
    Westlund, Per-Olof
    Umeå University.
    Structure and dynamics of interfacial water in an Lalpha phase lipid bilayer from molecular dynamics simulations.2003In: Biophysical Journal, ISSN 0006-3495, E-ISSN 1542-0086, Vol. 84, no 1, 102-15 p.Article in journal (Refereed)
    Abstract [en]

    Based on molecular dynamics simulations, an analysis of structure and dynamics is performed on interfacial water at a liquid crystalline dipalmitoylphosphatidycholine/water system. Water properties relevant for understanding NMR relaxation are emphasized. The first and second rank orientational order parameters of the water O-H bonds were calculated, where the second rank order parameter is in agreement with experimental determined quadrupolar splittings. Also, two different interfacial water regions (bound water regions) are revealed with respect to different signs of the second rank order parameter. The water reorientation correlation function reveals a mixture of fast and slow decaying parts. The fast (ps) part of the correlation function is due to local anisotropic water reorientation whereas the much slower part is due to more complicated processes including lateral diffusion along the interface and chemical exchange between free and bound water molecules. The 100-ns-long molecular dynamics simulation at constant pressure (1 atm) and at a temperature of 50 degrees C of 64 lipid molecules and 64 x 23 water molecules lack a slow water reorientation correlation component in the ns time scale. The (2)H(2)O powder spectrum of the dipalmitoylphosphatidycholine/water system is narrow and consequently, the NMR relaxation time T(2) is too short compared to experimental results.

  • 18.
    Andersson, Erika
    KTH, Superseded Departments, Physics.
    Quantum information and atomic networks2000Doctoral thesis, comprehensive summary (Other scientific)
  • 19.
    Andersson, Erika
    KTH, Superseded Departments, Physics.
    Quantum information in atomic networks2000Licentiate thesis, comprehensive summary (Other scientific)
  • 20. Andersson, K.
    et al.
    Delsing, P.
    Haviland, David B.
    KTH, Superseded Departments, Physics.
    Synchronous Cooper pair tunneling in a 1D-array of Josephson junctions2000In: Physica. B, Condensed matter, ISSN 0921-4526, Vol. 284, 1816-1817 p.Article in journal (Refereed)
    Abstract [en]

    We have studied 1D-arrays of Josephson junctions with a gate capacitively coupled to the middle of the array. The SQUID shape of each junction enables tuning of the Josephson coupling energy, El. By adding a signal to the gate with a radio-frequency f we create a step in the I-V characteristics at the value I = 2ef: The step is clearly visible as a peak in the differential resistance dI/dV and can be seen in the whole frequency range studied (10-90 MHz).

  • 21. Andersson, K.
    et al.
    Haviland, David B.
    KTH, Superseded Departments, Physics.
    Escape from a zero-current state in a one-dimensional array of Josephson junctions2003In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 67, no 9Article in journal (Refereed)
    Abstract [en]

    A long one-dimensional array of small Josephson junctions exhibits Coulomb blockade of Cooper pair tunneling. This zero-current state exists up to a switching voltage, V-sw, where there is a sudden onset of current. In this paper we present histograms showing how V-sw changes with temperature for a long array and calculations of the corresponding escape rates. Our analysis of the problem is based on the existence of a voltage-dependent energy barrier and we do not make any assumptions about its shape. The data divide into two temperature regimes, the higher of which can be explained with the Kramers thermal escape model. At low temperatures the escape becomes independent of temperature.

  • 22.
    Andersson, Karin
    KTH, Superseded Departments, Physics.
    A cooper pair turnstile made from a one dimensional array of Josephson junctions1999Licentiate thesis, comprehensive summary (Other scientific)
  • 23.
    Andersson, Karin
    KTH, Superseded Departments, Physics.
    Coulomb blockade of Cooper pair tunneling in one dimensional Josephson junction arrays2002Doctoral thesis, comprehensive summary (Other scientific)
  • 24.
    Andersson, Karl E.
    et al.
    KTH, Superseded Departments, Physics.
    Madejski, G M
    Complex structure of galaxy cluster A1689: Evidence for a merger from X-ray data?2004In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 607, no 1, 190-201 p.Article in journal (Refereed)
    Abstract [en]

    A1689 is a galaxy cluster at z = 0.183 for which previous measurements of its mass by using various techniques gave discrepant results. We present a new detailed measurement of the mass with the data based on X-ray observations with the European Photon Imaging Camera aboard the XMM-Newton Observatory, determined by using an unparameterized deprojection technique. Fitting the total mass profile to a Navarro-Frenk-White model yields halo concentration c = 7.2(-2.4)(+1.6) and r(200) = 1.13 +/- 0.21 h(-1) Mpc, corresponding to a mass that is less than half of that found from gravitational lensing. Adding to the evidence of substructure from optical observations, X-ray analysis shows a highly asymmetric temperature profile and a nonuniform redshift distribution, implying large-scale relative motion of the gas. A lower than expected gas mass fraction f(gas) = 0.072 +/- 0: 008 (for a flat LambdaCDM cosmology) suggests a complex spatial and/or dynamical structure. We also find no sign of any additional absorbing component previously reported on the basis of the Chandra data, confirming the XMM-Newton low-energy response by using data from ROSAT.

  • 25.
    Andersson, Magnus
    KTH, Superseded Departments, Physics.
    Development of a rotation sample holder with high angular resolution1999Report (Other academic)
  • 26.
    Andersson, Magnus
    KTH, Superseded Departments, Physics.
    Studies of magnetoresistance and Y substitutions in YBa2Cu3O7-delta high temperature superconductors1992Doctoral thesis, comprehensive summary (Other academic)
  • 27.
    Andersson, Magnus
    KTH, Superseded Departments, Physics.
    The Oxford cryostat - a manual1991Report (Other academic)
  • 28.
    Andersson, Magnus
    KTH, Superseded Departments, Physics.
    User manual for the 4He cryostat with an 8 T superconducting coil1998Report (Other academic)
  • 29.
    Andersson, Magnus
    et al.
    KTH, Superseded Departments, Physics.
    Börjesson, Lars
    Physics Department, Chalmers University of Technology.
    Jarlborg, T
    Departement de Physique de la Matière Condensée, Université de Genève.
    Phuong, HV
    Physics Department, Chalmers University of Technology.
    Rapp, Östen
    KTH, Superseded Departments, Physics.
    RELATION BETWEEN THE CU(1)-O(4) DISTANCE AND T(C) IN Y1-2XCAXTHXBA2CU3O7-DELTA - RAMAN-SCATTERING AND CALCULATION OF THE ELECTRON-PHONON INTERACTION1992In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 46, no 10, 6501-6504 p.Article in journal (Refereed)
    Abstract [en]

    The strong depression of T(c) with Ca-Th substitution in Y1-2xCaxThxBa2Cu3O7-delta has been investigated in a model calculation of the electronic and phononic contributions from the apex oxygen, O(4), on the electron-phonon interaction, lambda. The shift with Ca-Th substitution of the characteristic O(4) vibrational mode was measured by Raman scattering. The electronic part eta of lambda has been calculated at several distances between chain Cu(1) and O(4) in the region of the observed variation with x. Eta was found to depend strongly on this distance. The results show a small increase with x of the O(4) frequency and a strong decrease of eta. Both these factors thus contribute to a decrease of lambda. We therefore find evidence that a decreasing electron-phonon interaction is associated with the depression of T(c) in Ca-Th substituted YBa2Cu3O7-delta.

  • 30.
    Andersson, Magnus
    et al.
    KTH, Superseded Departments, Physics.
    Eltsev, Yuri
    KTH, Superseded Departments, Physics.
    Lundqvist, Björn
    KTH, Superseded Departments, Physics.
    Rydh, Andreas
    KTH, Superseded Departments, Physics.
    Rapp, Östen
    KTH, Superseded Departments, Physics.
    Vortex liquid properties in optimally doped and oxygen-deficient YBa2Cu3O7-delta single crystals2000In: Physica. C, Superconductivity, ISSN 0921-4534, Vol. 332, no 1-4, 86-92 p.Article in journal (Refereed)
    Abstract [en]

    The electrical anisotropy, gamma = (m(c)/m(ab))(1/2), can easily be varied by changing the oxygen content in single crystals of YBa2Cu3O7-delta (YBCO); thus making this system useful as a test system For vortex dynamics in high-temperature superconductors (HTSC). Here, some recent results are reviewed. Measurements of the c-axis resistivity with the magnetic field B II ab-plane is shown to be a powerful tool in studying vortex velocity correlations both parallel and perpendicular to the applied field. In optimally doped crystals, we iind evidence that the in-plane vortex lattice melts at T-m into a disentangled vortex liquid, which looses its correlation along the c-axis at a higher temperature T-br > T-m. For weakly disordered crystals and magnetic fields B \\ c-axis, a relation between the vortex glass line and the magnetic field dependence of the characteristic energy, U*, in the pinned vortex liquid is proposed. This approach is shown to give support to our idea of describing the vortex glass resistivity in the liquid regime by a modified glass correlation Length, xi(g) = xi(0)\k(B)T/U-0 - 1\(-nu) which depends on the average pinning energy, Lr,, in the system [A. Rydh, O. Rapp, M. Andersson, Phys. Rev. Lett. 83 (1999) 1850].

  • 31.
    Andersson, Magnus
    et al.
    KTH, Superseded Departments, Physics.
    Hegedüs, Zsolt
    Arrheniulaboratoriet, Stockholms Universitet.
    Hörlin, Tom
    Arrheniuslaboratoriet, Stockholms Universitet.
    Nygren, Mats
    Arrhemiuslaboratoriet, Stockholms Universitet.
    Rapp, Östen
    KTH, Superseded Departments, Physics.
    Wen, T. L.
    Arrheniuslaboratoriet, Stockholms Universitet.
    (Ca,Pr) substitutions in Y- and Sm-based 1:2:3 superconductors1992In: / [ed] Per-Anker Lindgård, Odense, Denmark: Risø National Laboratory , 1992, 236-236 p.Conference paper (Other academic)
  • 32.
    Andersson, Magnus
    et al.
    KTH, Superseded Departments, Physics.
    Hegedüs, Zsolt
    Arrheniuslaboratoriet, Stockholms Universitet.
    Nygren, Mats
    Arrheniuslaboratoriet, Stockholms Universitet.
    Rapp, Östen
    KTH, Superseded Departments, Physics.
    STRUCTURAL, THERMAL AND ELECTRICAL STUDIES OF THE Y1-2XCAXTHXBA2CU3O7-DELTA SYSTEM WITH 0 LESS-THAN-OR-EQUAL-TO 0.201989In: Physica. C, Superconductivity, ISSN 0921-4534, Vol. 160, no 1, 65-68 p.Article in journal (Refereed)
  • 33.
    Andersson, Magnus
    et al.
    KTH, Superseded Departments, Physics.
    Rapp, Östen
    KTH, Superseded Departments, Physics.
    MAGNETORESISTANCE MEASUREMENTS ON (CA,TH)-DOPED YBA2CU3O7-DELTA1991In: Physica. C, Superconductivity, ISSN 0921-4534, Vol. 185, 1901-1902 p.Article in journal (Refereed)
    Abstract [en]

    Magnetoresistance measurements on sintered Y1-2xCaxThxBa2Cu3O7-delta samples with x < = 0.1 are reported. By fitting the measured data to the Hikami-Larkin theory, we obtain coherence lengths, xi-ab and xi-c’ and a phase breaking time tau-phi All these parameters are found to decrease with (Ca,Th) doping. We also conclude that magnetoresistance measurements are highly sensitive to inhomogeneities in the sample.

  • 34.
    Andersson, Magnus
    et al.
    KTH, Superseded Departments, Physics.
    Rapp, Östen
    KTH, Superseded Departments, Physics.
    MAGNETORESISTANCE MEASUREMENTS ON POLYCRYSTALLINE YBA2CU3O7-DELTA1991In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 44, no 14, 7722-7725 p.Article in journal (Refereed)
    Abstract [en]

    The magnetoresistance of a polycrystalline sample of YBa2Cu3O7-delta has been measured by an ordinary resistive method at temperatures from about 1 to 15 K above T(c) and in magnetic fields up to 12 T. From our experimental results and the theory of Hikami and Larkin, we obtain values of the coherence lengths xi-ab = 15.6 angstrom and xi-c = 3.6 angstrom and of the phase-breaking time tau-phi = 1.8 x 10(-13) s.

  • 35.
    Andersson, Magnus
    et al.
    KTH, Superseded Departments, Physics.
    Rapp, Östen
    KTH, Superseded Departments, Physics.
    MAGNETORESISTANCE MEASUREMENTS ON SINTERED YBA2CU3O7-DELTA1990In: Physica. B, Condensed matter, ISSN 0921-4526, Vol. 165, 1365-1366 p.Article in journal (Refereed)
  • 36.
    Andersson, Magnus
    et al.
    KTH, Superseded Departments, Physics.
    Rapp, Östen
    KTH, Superseded Departments, Physics.
    UPPER CRITICAL MAGNETIC-FIELD OF Y1-2XCAXTHXBA2CU3O7-DELTA1989In: Physica. C, Superconductivity, ISSN 0921-4534, Vol. 162, 725-726 p.Article in journal (Refereed)
  • 37.
    Andersson, Magnus
    et al.
    KTH, Superseded Departments, Physics.
    Rapp, Östen
    KTH, Superseded Departments, Physics.
    Hegedüs, Zsolt
    Arrheniuslaboratoriet, Stockholms Universitet.
    Wen, TL
    Arrheniuslaboratoriet, Stockholms Universitet.
    Nygren, Mats
    Arrheniuslaboratoriet, Stockholms Universitet.
    STRUCTURAL AND SUPERCONDUCTING PROPERTIES OF Y1-2XCAXPRXBA2CU3O7-GAMMA1992In: Physica. C, Superconductivity, ISSN 0921-4534, Vol. 190, no 3, 255-260 p.Article in journal (Refereed)
    Abstract [en]

    Samples of the nominal composition Y1-2xCaxPrxBa2Cu3O7-delta with 0 less-than-or-equal-to x less-than-or-equal-to 0.4 have been studied by X-ray diffraction techniques, chemical analyses, and measurements of the super conducting transition temperature and the upper critical magnetic field. For x less-than-or-equal-to 0.25, the results indicate that Ca and Pr can both replace Y in agreement with the nominal composition, while for x > 0.25 only Pr enters the orthorhombic unit cell. Compared to Pr substitution in 1:2:3 we observe small changes in the depression of T(c) and strong changes in the critical field slopes. These results suggest that if Pr has a magnetic pair-breaking effect, it is close to being temperature independent.

  • 38.
    Andersson, Magnus
    et al.
    KTH, Superseded Departments, Physics.
    Rapp, Östen
    KTH, Superseded Departments, Physics.
    Tellgren, Roland
    Institutet för kemi, Uppsala Universitet.
    NEUTRON-DIFFRACTION STUDIES OF CA-PR DOPED YBA2CU3O7-DELTA1993In: Physica. C, Superconductivity, ISSN 0921-4534, Vol. 205, no 1-2, 105-110 p.Article in journal (Refereed)
    Abstract [en]

    We have performed neutron powder diffraction on samples in a series Y1-2xCaxPrxBa2Cu3O7-delta, with x=0.0, 0.1 and 0.2, and analyzed the data with the Rietveld refinement method. Small changes were observed in atomic bond distances when the amount of Ca-Pr was increased. In general, these changes could qualitatively be viewed as the sum of effects from the Ca and Pr substitutions in YBa2Cu3O7-delta samples. Analyses of the distance between the superconducting CuO2 Planes suggest that the Pr ions in the Ca-Pr substituted samples have an effective valence close to + 4.

  • 39.
    Andersson, Magnus
    et al.
    KTH, Superseded Departments, Physics.
    Rapp, Östen
    KTH, Superseded Departments, Physics.
    Tellgren, Roland
    Institutet för kemi, Uppsala Universitet.
    NEUTRON-DIFFRACTION STUDIES OF Y1-2XCAXTHXBA2CU3O7-DELTA WITH X-LESS-THAN=0.11991In: Physica. C, Superconductivity, ISSN 0921-4534, Vol. 185, 915-916 p.Article in journal (Refereed)
    Abstract [en]

    We have made Rietveld refinements on neutron powder diffraction data from Y1-2xCaxThxBa2Cu3O7-delta samples with x < = 0.1. Only small changes in lattice distances are detected. Most noticeable are a flattening of the CuO-planes and a possible small increase in the distance between Cu(1) and the edge oxygen O(4). A comparison with the Y1-xCaxBa2Cu3O7-delta system is made.

  • 40.
    Andersson, Magnus
    et al.
    KTH, Superseded Departments, Physics.
    Rapp, Östen
    KTH, Superseded Departments, Physics.
    Wen, TL
    Arrheniuslaboratoriet, Stockholms Universitet.
    Hegedüs, Zsolt
    Arrheniuslaboratoriet, Stockholms Universitet.
    Nygren, Mats
    Arrheniuslaboratoriet, Stockholms Universitet.
    CA AND PR SUBSTITUTION IN Y-BASED AND SM-BASED 1-2-3 COMPOUNDS1993In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 48, no 10, 7590-7597 p.Article in journal (Refereed)
    Abstract [en]

    Substitution with equal amounts of Ca and Pr has been studied mainly in Y- and Sm-based 1:2:3 samples and with some results also for Nd-based samples. Structural and chemical analysis and measurements of the superconducting T(c) and the upper critical magnetic field were performed. It was found that Ca and Pr can be dissolved in the orthorhombic structure up to about 25 at. % each in both Y- and Sm-based samples while for larger concentrations, only Pr continued to enter into the 1:2:3 structure. The depression of T(c) with Ca-Pr doping was found to be linear in concentration in contrast to the accelerated decrease in samples doped with only Pr. The rate of depression of T(c) increased in the sequence Y-, Sm-, and Nd-based hosts. The results suggest that Ca-Pr doping isolates a characteristic Pr-impurity effect in 1:2:3 samples. The critical magnetic-field slopes of Y- and Sm-based samples were almost independent of Ca-Pr content in the cosolubility region while a strong decrease was observed for larger Pr content, similar to 1:2:3 samples doped with Pr only. These results suggest an almost-temperature-independent magnetic pair-breaking effect by Pr.

  • 41.
    Andersson, Magnus
    et al.
    KTH, Superseded Departments, Physics.
    Rydh, Andreas
    KTH, Superseded Departments, Physics.
    Rapp, Östen
    KTH, Superseded Departments, Physics.
    Vortex liquid resistivity in disordered YBa2Cu3O7-delta single crystals2000In: Physica. C, Superconductivity, ISSN 0921-4534, Vol. 341, 1239-1240 p.Article in journal (Refereed)
    Abstract [en]

    The vortex solid-to-liquid transition line, T-g(B) and the linear resistivity in the vortex liquid of an optimally doped disordered YBa2Cu3O7-delta Single crystal is analyzed in detail. Our previously proposed description [Rydh, Rapp and Andersson, Phys.Rev.Lett. 83 (1999) 1850] is shown to quantitatively describe both T-g(B) and the vortex liquid resistivity above T-g using the same parameters. Furthermore, a comparison with the thermally activated behaviour usually employed to account for the resistivity in the vortex liquid is reported.

  • 42. Andersson, R. M.
    et al.
    Aizman, O.
    Aperia, A.
    Brismar, Hjalmar
    KTH, Superseded Departments, Physics.
    Modulation of Na+,K+-ATPase activity is of importance for RVD2004In: Acta Physiologica Scandinavica, ISSN 0001-6772, E-ISSN 1365-201X, Vol. 180, no 4, 329-334 p.Article in journal (Refereed)
    Abstract [en]

    Aim: This study was performed to examine the role of Na+,K+-ATPase activity for the adaptive response to cell swelling induced by hypoosmoticity, i.e. the regulatory volume decrease (RVD). Methods: The studies were performed on COS-7 cells transfected with rat Na+,K+-ATPase. To study changes in cell volume, cells were loaded with the fluorescent dye calcein and the intensity of the dye, following exposure to a hypoosmotic medium, was recorded with confocal microscopy. Results: Ouabain-mediated inhibition of Na+,K+-ATPase resulted in a dose dependent decrease in the rate of RVD. Total Rb-86(+) uptake as well as ouabain dependent Rb-86(+) uptake, used as an index of Na+,K+-ATPase dependent K+ uptake, was significantly increased during the first 2 min following exposure to hypoosmoticity. Since protein kinase C (PKC) plays an important role in the modulation of RVD, a study was carried out on COS-7 cells expressing rat Na+,K+-ATPase, where Ser23 in the catalytic alpha1 subunit of rat Na+,K+-ATPase had been mutated to Ala (S23A), abolishing a known PKC phosphorylation site. Cells expressing S23A rat Na+,K+-ATPase exhibited a significantly lower rate of RVD and showed no increase in Rb-86(+) uptake during RVD. Conclusion: Taken together, these results suggest that a PKC-mediated transient increase in Na+,K+-ATPase activity plays an important role in RVD.

  • 43. Andersson, R. M.
    et al.
    Carlsson, Kjell
    KTH, Superseded Departments, Physics.
    Liljeborg, A.
    Brismar, Hjalmar
    Characterization of probe binding and comparison of its influence on fluorescence lifetime of two pH-sensitive benzo c xanthene dyes using intensity-modulated multiple-wavelength scanning technique2000In: Analytical Biochemistry, ISSN 0003-2697, E-ISSN 1096-0309, Vol. 283, no 1, 104-110 p.Article in journal (Refereed)
    Abstract [en]

    Quantitative pH imaging using the carboxy semi-naphthofluorescein dyes SNAFL-1 and SNAFL-2 can be performed by measurement of intensity ratios or fluorescence lifetimes. However, there is a controversy as to whether the latter method has the practical advantage of a straightforward pH calibration in buffers compared to a cumbersome and time-consuming procedure in cells. In this study we have undertaken a systematic study of the potential factors influencing the fluorescence lifetime of the probes at different pH using confocal microscopy. In vitro results demonstrate that factors such as lipid and protein concentrations have a substantial influence on pH measurements based on fluorescence lifetime. The pH could be overestimated by more than 2 pH units. Studies in permeabilized COS-7 cells demonstrate the same trends as observed in the in vitro studies.

  • 44.
    Anderssson, Magnus
    et al.
    KTH, Superseded Departments, Physics.
    Rapp, Östen
    KTH, Superseded Departments, Physics.
    Tellgren, Roland
    Institutet för kemi, Uppsala Universitet.
    NEUTRON-DIFFRACTION STUDIES OF INTERATOMIC DISTANCES IN THE Y1-2XCAXTHXBA2CU3O7-DELTA SYSTEM1992In: Solid State Communications, ISSN 0038-1098, E-ISSN 1879-2766, Vol. 81, no 5, 425-429 p.Article in journal (Refereed)
    Abstract [en]

    Neutron diffraction studies have been performed for three samples of Y(1-2x)Ca(x)Th(x)Ba2Cu3O7-delta with 0 less-than-or-equal-to x less-than-or-equal-to 0.1. With increasing x, a decreased puckering of the Cu-O planes is found. Changes in copper oxygen distances are generally small. Evidence is found for a small increase in the distance between Cu(1) and O(4) (on the cell edge) with increased CaTh concentration. An increased oxygen disorder is observed at x = 0.1.

  • 45. Andreyev, A. N.
    et al.
    Ackermann, D.
    Cagarda, P.
    Gerl, J.
    Hessberger, F. P.
    Hofmann, S.
    Huyse, M.
    Keenan, A.
    Kettunen, H.
    Kleinbohl, A.
    Lavrentiev, A.
    Leino, M.
    Lommel, B.
    Matos, M.
    Munzenberg, G.
    Moore, C. J.
    O'Leary, C. D.
    Page, R. D.
    Reshitko, S.
    Saro, S.
    Schlegel, C.
    Shaffner, H.
    Taylor, M. J.
    Van Duppen, P.
    Weissman, L.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    New microsecond isomers in Bi-189,Bi-1902001In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 10, no 2, 129-133 p.Article in journal (Refereed)
    Abstract [en]

    New microsecond isomers in the neutron-deficient isotopes Bi-189g,Bi-190 have been identified after in-flight separation by the velocity filter SHIP. The evaporation residues were identified on the basis of delayed recoil-gamma /X-ray, recoil-gamma /X-ray-alpha and excitation function measurements. The systematics of the [pi 1i(13/2)]13/2(+) excited states in the odd-mass Bi nuclei is discussed.

  • 46. Andreyev, A. N.
    et al.
    Ackermann, D.
    Hessberger, F. P.
    Heyde, K.
    Hofmann, S.
    Huyse, M.
    Karlgren, Daniel
    KTH, Superseded Departments, Physics.
    Kojouharov, I.
    Kindler, B.
    Lommel, B.
    Munzenberg, G.
    Page, R. D.
    de Vel, K. V.
    Van Duppen, P.
    Walters, W. B.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Shape-changing particle decays of Bi-185 and structure of the lightest odd-mass Bi isotopes2004In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 69, no 5, 054308- p.Article in journal (Refereed)
    Abstract [en]

    Proton and alpha decay of the proton-rich nuclide Bi-185 has been restudied in more detail in the complete fusion reaction Nb-93(Mo-95, 3n)Bi-185 at the velocity filter SHIP. The observed decay pattern of Bi-185 and of the heavier odd-mass isotopes Bi-187,Bi-189,Bi-191,Bi-193 are interpreted based on potential-energy surface calculations. It is shown that the experimental systematics of the particle decays and of the excited states in these nuclei (where known) can be explained by the prolate-oblate shape co-existence at low excitation energy. The observed state in Bi-185 is proposed to be of prolate nature, which is in contrast with the previously proposed oblate interpretation.

  • 47. Andreyev, A. N.
    et al.
    Huyse, M.
    Van de Vel, K.
    Van Duppen, P.
    Dorvaux, O.
    Greenlees, P.
    Helariutta, K.
    Jones, P.
    Julin, R.
    Juutinen, S.
    Kettunen, H.
    Kuusiniemi, P.
    Leino, M.
    Muikku, M.
    Nieminen, P.
    Rahkila, P.
    Uusitalo, J.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Hauschild, K.
    Le Coz, Y.
    In-beam and alpha-decay spectroscopy of Po-191 and evidence for triple shape coexistence at low energy in the daughter nucleus Pb-1872002In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 66, no 1Article in journal (Refereed)
    Abstract [en]

    Prompt gamma rays have been observed for the first time from the neutron-deficient nucleus Po-191 using the recoil-decay tagging technique at the RITU gas-filled separator. In addition improved alpha decay data have been measured for Po-191 and its daughter product Pb-187. The complementary gamma- and alpha-decay data point to the onset of oblate deformation in the light odd-mass Po nuclei by approaching the neutron midshell at N=104. The pattern of the favored and unfavored states observed on top of the 13/2(+) isomer in Po-191 indicates a change from the weak-coupling towards the strong-coupling scheme in Po-191m. In the daughter nucleus Pb-187, the 13/2(+) and 3/2(-) isomeric states become degenerate within the experimental accuracy. Evidence for triple shape coexistence at low energy has been found in the high-spin isomer in Pb-187. The results are supported by potential-energy surface calculations and by particle-plus-rotor calculations.

  • 48. Andreyev, A. N.
    et al.
    Huyse, M.
    Van Duppen, P.
    Weissman, L.
    Ackermann, D.
    Gerl, J.
    Hessberger, F. P.
    Hofmann, S.
    Kleinbohl, A.
    Munzenberg, G.
    Reschitko, S.
    Schlegel, C.
    Schaffner, H.
    Cagarda, P.
    Matos, M.
    Saro, S.
    Keenan, A.
    Moore, C. J.
    O'Leary, C. D.
    Page, R. D.
    Taylor, M. J.
    Kettunen, H.
    Leino, M.
    Lavrentiev, A.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Heyde, K.
    The discovery of a prolate-oblate-spherical shape triple of spin 0(+) states in the atomic nucleus Pb-1862001In: Nuclear Physics A, ISSN 0375-9474, Vol. 682, 482C-486C p.Article in journal (Refereed)
    Abstract [en]

    Two excited J(pi)=0(+) states in Pb-186 populated in the a-decay of Po-190 have been identified through alpha -particle/conversion electron coincidences in an experiment at the velocity filter SHIP. The parent Po-190 nuclei have been produced in the Nd-142(Cr-52,4n)Po-190 complete fusion reaction, alpha -particle energies and branching ratios have been measured and hindrance factors were deduced. The observed states have been interpreted as the band heads of the known prolate and (yet unobserved) oblate rotational bands in Pb-186.

  • 49. Andrieux, M. L.
    et al.
    Belhorma, B.
    Belymam, A.
    Benchekroun, D.
    Cherkaoui, R.
    Clement, C.
    Collot, J.
    de Saintignon, P.
    Driouichi, C.
    Dzahini, D.
    El Mouahhidi, Y.
    Erridi, H.
    Ferrari, A.
    Ghazlane, H.
    Hostachy, J. Y.
    Hoummada, A.
    Idrissi, A.
    Laborie, G.
    Lund-Jensen, Bengt
    KTH, Superseded Departments, Physics.
    Martin, P.
    Muraz, J. F.
    Soderqvist, J.
    Construction and test of the first two sectors of the ATLAS barrel liquid argon presampler2002In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, Vol. 479, no 03-feb, 316-333 p.Article in journal (Refereed)
    Abstract [en]

    The electromagnetic (e.m.) calorimeter of the ATLAS experiment for the Large Hadron Collider will be a sampling liquid argon accordion calorimeter. To achieve sufficient energy resolution, it is necessary to correct for the energy loss in the material upstream of the calorimeter. For this purpose, a separate presampler detector fixed on the inner face of the e.m. calorimeter, in the same cryostat, is being built by the ATLAS collaboration. Two presampler sectors have already been built and tested in their final version. The geometry of the detector and the various steps of its construction are reviewed. The hardware performance of the detector measured both at CERN and at the ISN-Grenoble (specific test bench) is discussed. It is concluded that the presampler will adequately fulfill its role for future operation at the CERN Large Hadron Collider.

  • 50. Andrieux, M. L.
    et al.
    Lundquist, J.
    Dinkespiler, B.
    Evans, G.
    Gallin-Martel, L.
    Pearce, Mark
    KTH, Superseded Departments, Physics.
    Rethore, F.
    Stroynowski, R.
    Ye, J.
    Single-event upset studies of a high-speed digital optical data link2001In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, Vol. 456, no 3, 342-351 p.Article in journal (Refereed)
    Abstract [en]

    The results from a series of neutron and photon irradiation tests of a high-speed digital optical data link based on a commercial serialiser and a vertical cavity surface emitting laser are described. The link was developed as a candidate for the front-end readout of the ATLAS electromagnetic calorimeter. The components at the emitting end of the link were unaffected by neutron and photon irradiation levels exceeding those expected during 10 years of LHC running. However, the link suffered from Single-Event Upsets (SEUs) when irradiated with energetic neutrons. A very general method based on the Burst Generation Rate (BGR) model has been developed and is used to extrapolate the error rate observed during tests to that expected at the LHC. A model-independent extrapolation was used to check the BGR approach and the results were consistent once systematic errors were taken into account.

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