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  • 1.
    Alpat, B.
    et al.
    Ist Nazl Fis Nucl, Italy; Sabanci Univ, Turkey.
    Gulgun, M.A.
    Sabanci Univ, Turkey.
    Corapcioglu, G.
    Sabanci Univ, Turkey.
    Yildizhan Özyar, Melike
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Di Lazzaro, P.
    ENEA, Italy.
    Murra, D.
    ENEA, Italy.
    Kaplanoglu, T.
    Maprad Srl, Italy.
    Postolache, V
    Maprad Srl, Italy.
    Mengali, S.
    Consorzio CREO, Italy.
    Simeoni, M.
    Consorzio CREO, Italy.
    Urbani, A.
    Consorzio CREO, Italy.
    Testing of substrates for flexible optical solar reflectors: irradiations of nano-hybrid coatings of polyimide films with 20 keV electrons and with 200-400 nm ultraviolet radiation2019In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 14, article id T06003Article in journal (Refereed)
    Abstract [en]

    In the frame of a project aimed at developing a new type of optical solar reflectors we present the scientific and technological issues addressed during irradiations of nano-hybrid coatings on polyimide films by using 20 keV electron beam from a modified use of Scanning Electron Microscope (SEM) and with ultraviolet (UV) dose equal to 300 space-equivalent Sun hours. Details of a new approach to use SEM for low energy electron irradiations and of a new UV irradiation setup are given.

  • 2.
    Anastasopoulos, M.
    et al.
    European Spallat Source, Sweden.
    Bebb, R.
    European Spallat Source, Sweden.
    Berry, K.
    Spallat Neutron Source, TN 37831 USA.
    Birch, Jens
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Brys, T.
    European Spallat Source, Sweden.
    Buffet, J. -C.
    Institute Laue Langevin, France.
    Clergeau, J. -F.
    Institute Laue Langevin, France.
    Deen, P. P.
    European Spallat Source, Sweden.
    Ehlers, G.
    Spallat Neutron Source, TN 37831 USA.
    van Esch, P.
    Institute Laue Langevin, France.
    Everett, S. M.
    Spallat Neutron Source, TN 37831 USA.
    Guerard, B.
    Institute Laue Langevin, France.
    Hall-Wilton, R.
    European Spallat Source, Sweden; Mid Sweden University, Sweden.
    Herwig, K.
    Spallat Neutron Source, TN 37831 USA.
    Hultman, Lars
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Höglund, Carina
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering. European Spallat Source, Sweden.
    Iruretagoiena, I.
    European Spallat Source, Sweden.
    Issa, F.
    European Spallat Source, Sweden.
    Jensen, Jens
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Khaplanov, A.
    European Spallat Source, Sweden.
    Kirstein, O.
    European Spallat Source, Sweden; University of Newcastle, Australia.
    Lopez Higuera, I.
    European Spallat Source, Sweden.
    Piscitelli, F.
    European Spallat Source, Sweden.
    Robinson, L.
    European Spallat Source, Sweden.
    Schmidt, Susann
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering. European Spallat Source, Sweden.
    Stefanescu, I.
    European Spallat Source, Sweden.
    Multi-Grid detector for neutron spectroscopy: results obtained on time-of-flight spectrometer CNCS2017In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 12, article id P04030Article in journal (Refereed)
    Abstract [en]

    The Multi-Grid detector technology has evolved from the proof-of-principle and characterisation stages. Here we report on the performance of the Multi-Grid detector, the MG. CNCS prototype, which has been installed and tested at the Cold Neutron Chopper Spectrometer, CNCS at SNS. This has allowed a side-by-side comparison to the performance of He-3 detectors on an operational instrument. The demonstrator has an active area of 0.2m(2). It is specifically tailored to the specifications of CNCS. The detector was installed in June 2016 and has operated since then, collecting neutron scattering data in parallel to the He-3 detectors of CNCS. In this paper, we present a comprehensive analysis of this data, in particular on instrument energy resolution, rate capability, background and relative efficiency. Stability, gamma-ray and fast neutron sensitivity have also been investigated. The effect of scattering in the detector components has been measured and provides input to comparison for Monte Carlo simulations. All data is presented in comparison to that measured by the He-3 detectors simultaneously, showing that all features recorded by one detector are also recorded by the other. The energy resolution matches closely. We find that the Multi-Grid is able to match the data collected by He-3, and see an indication of a considerable advantage in the count rate capability. Based on these results, we are confident that the Multi-Grid detector will be capable of producing high quality scientific data on chopper spectrometers utilising the unprecedented neutron flux of the ESS.

  • 3.
    Bennati, Paolo
    et al.
    KTH, Royal Institute of Technology, Stockholm, Sweden.
    Dasu, Alexandru
    The Skandion Clinic, Uppsala, Sweden.
    Colarieti-Tosti, Massimiliano
    KTH, Royal Institute of Technology, Stockholm, Sweden.
    Lönn, Gustaf
    KTH, Royal Institute of Technology, Stockholm, Sweden.
    Larsson, David
    KTH, Royal Institute of Technology, Stockholm, Sweden.
    Fabbri, Andrea
    INFN, National Institute for Nuclear Physics, Rome, Italy.
    Galasso, Matteo
    INFN, National Institute for Nuclear Physics, Rome, Italy.
    Cinti, Maria Nerina
    Sapienza University, Rome, Italy.
    Pellegrini, Rosanna
    Sapienza University, Rome, Italy.
    Pani, Roberto
    Sapienza University, Rome, Italy.
    Preliminary study of a new gamma imager for on-line proton range monitoring during proton radiotherapy2017In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 12, no 5, article id C05009Article in journal (Refereed)
    Abstract [en]

    We designed and tested new concept imaging devices, based on a thin scintillating crystal, aimed at the online monitoring of the range of protons in tissue during proton radiotherapy. The proposed crystal can guarantee better spatial resolution and lower sensitivity with respect to a thicker one, at the cost of a coarser energy resolution. Two different samples of thin crystals were coupled to a position sensitive photo multiplier tube read out by 64 independent channels electronics. The detector was equipped with a knife-edge Lead collimator that defined a reasonable field of view of about 10 cm in the target. Geant4 Monte Carlo simulations were used to optimize the design of the experimental setup and assess the accuracy of the results. Experimental measurements were carried out at the Skandion Clinic, the recently opened proton beam facility in Uppsala, Sweden. PMMA and water phantoms studies were performed with a first prototype based on a round 6.0 mm thick Cry019 crystal and with a second detector based on a thinner 5 × 5 cm2, 2.0 mm thick LFS crystal. Phantoms were irradiated with mono-energetic proton beams whose energy was in the range between 110 and 160 MeV. According with the simulations and the experimental data, the detector based on LFS crystal seems able to identify the peak of prompt-gamma radiation and its results are in fair agreement with the expected shift of the proton range as a function of energy. The count rate remains one of the most critical limitations of our system, which was able to cope with only about 20% of the clinical dose rate. Nevertheless, we are confident that our study might provide the basis for developing a new full-functional system.

  • 4.
    Birch, Jens
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Buffet, J. -C.
    Institute Laue Langevin, France.
    Clergeau, J. -F.
    Institute Laue Langevin, France.
    van Esch, P.
    Institute Laue Langevin, France.
    Ferraton, M.
    Institute Laue Langevin, France.
    Guerard, B.
    Institute Laue Langevin, France.
    Hall-Wilton, R.
    European Spallat Source, Sweden; Mid Sweden University, Sweden.
    Hultman, Lars
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Höglund, Carina
    Linköping University, Department of Physics, Chemistry and Biology. European Spallat Source, Sweden.
    Jensen, Jens
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Khaplanov, A.
    Institute Laue Langevin, France; European Spallat Source, Sweden.
    Piscitelli, F.
    Institute Laue Langevin, France; European Spallat Source, Sweden.
    Investigation of background in large-area neutron detectors due to alpha emission from impurities in aluminium2015In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 10, p. 1-14Article in journal (Refereed)
    Abstract [en]

    Thermal neutron detector based on films of (B4C)-B-10 have been developed as an alternative to He-3 detectors. In particular, The Multi-Grid detector concept is considered for future large area detectors for ESS and ILL instruments. An excellent signal-to-background ratio is essential to attain expected scientific results. Aluminium is the most natural material for the mechanical structure of of the Multi-Grid detector and other similar concepts due to its mechanical and neutronic properties. Due to natural concentration of alpha emitters, however, the background from alpha particles misidentified as neutrons can be unacceptably high. We present our experience operating a detector prototype affected by this issue. Monte Carlo simulations have been used to confirm the background as alpha particles. The issues have been addressed in the more recent implementations of the Multi-Grid detector by the use of purified aluminium as well as Ni-plating of standard aluminium. The result is the reduction in background by two orders of magnitude. A new large-area prototype has been built incorporating these modifications.

  • 5.
    Kubancak, J.
    et al.
    Nuclear Physics Institute of the ASCR, Prague, Czech Republic; Czech Technical University in Prague, Czech Republic.
    Ambrozova, I.
    Nuclear Physics Institute of the ASCR, Prague, Czech Republic.
    Buetikofer, R.
    University of Bern and International Foundation High Altitude Research Stations Jungfraujoch and Gornergrat, Bern, Switzerland.
    Kudela, K.
    Slovak Academic of Science, Košice, Slovakia .
    Langer, R.
    Slovak Academic of Science, Košice, Slovakia .
    Davidkova, M.
    Nuclear Physics Institute of the ASCR, Prague, Czech Republic.
    Ploc, O.
    Nuclear Physics Institute of the ASCR, Prague, Czech Republic.
    Malusek, Alexandr
    Linköping University, Department of Medical and Health Sciences, Division of Radiological Sciences. Linköping University, Faculty of Health Sciences.
    Liulin silicon semiconductor spectrometers as cosmic ray monitors at  the high mountain observatories Jungfraujoch and Lomnický štít2014In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 9, no P07018Article in journal (Refereed)
    Abstract [en]

    Currently, most cosmic ray data are obtained by detectors on satellites, aircraft, high-altitude balloons and ground (neutron monitors). In our work, we examined whether Liulin semiconductor spectrometers (simple silicon planar diode detectors with spectrometric properties) located at high mountain observatories could contribute new information to the monitoring of cosmic rays by analyzing data from selected solar events between 2005 and 2013. The decision thresholds and detection limits of these detectors placed at Jungfraujoch (Switzerland; 3475 m a.s.l.; vertical cut-off rigidity 4.5 GV) and Lomnicky. stit (Slovakia; 2633 m a.s.l.; vertical cut-off rigidity 3.84 GV) highmountain observatories were determined. The data showed that only the strongest variations of the cosmic ray flux in this period were detectable. The main limitation in the performance of these detectors is their small sensitive volume and low sensitivity of the PIN photodiode to neutrons.

  • 6.
    Margato, L. M. S.
    et al.
    Univ Coimbra, Portugal.
    Morozov, A.
    Univ Coimbra, Portugal.
    Blanco, A.
    Univ Coimbra, Portugal.
    Fonte, P.
    Univ Coimbra, Portugal; Coimbra Polytech ISEC, Portugal.
    Fraga, F. A. F.
    Univ Coimbra, Portugal.
    Guerard, B.
    ILL Inst Laue Langevin, France.
    Hall-Wilton, R.
    European Spallat Source ERIC ESS, Sweden; Mid Sweden Univ, Sweden.
    Höglund, Carina
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering. European Spallat Source ERIC ESS, Sweden.
    Mangiarotti, A.
    Univ Sao Paulo, Brazil.
    Robinson, L.
    European Spallat Source ERIC ESS, Sweden.
    Schmidt, S.
    European Spallat Source ERIC ESS, Sweden; IHI Ionbond AG, Switzerland.
    Zeitelhack, K.
    Tech Univ Munich, Germany.
    Boron-10 lined RPCs for sub-millimeter resolution thermal neutron detectors: Feasibility study in a thermal neutron beam2018In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 14, article id P01017Article in journal (Refereed)
    Abstract [en]

    The results of an experimental feasibility study of a position sensitive thermal neutron detector based on a resistive plate chamber (RPC) are presented. The detector prototype features a thin-gap (0.35 mm) hybrid RPC with an aluminium cathode and a float glass anode. The cathode is lined with a 2 mu m thick (B4C)-B-10 neutron converter enriched in B-10. A detection efficiency of 6.2% is measured at the neutron beam (lambda = 2.5 angstrom) for normal incidence. A spatial resolution better than 0.5 mm FWHM is demonstrated.

  • 7.
    Muraro, A.
    et al.
    IFP CNR, Italy.
    Albani, G.
    University of Milano Bicocca, Italy.
    Perelli Cippo, E.
    IFP CNR, Italy.
    Croci, G.
    University of Milano Bicocca, Italy.
    Angella, G.
    IENI CNR, Italy.
    Birch, Jens
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Cazzaniga, C.
    STFC, England.
    Caniello, R.
    IFP CNR, Italy.
    DellEra, F.
    IFP CNR, Italy.
    Ghezzi, F.
    IFP CNR, Italy.
    Grosso, G.
    IFP CNR, Italy.
    Hall-Wilton, R.
    European Spallat Source ESS ERIC, Sweden.
    Höglund, Carina
    Linköping University, Department of Physics, Chemistry and Biology. Linköping University, Faculty of Science & Engineering.
    Hultman, Lars
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Schmidt, Susann
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Robinson, Linda
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Rebai, M.
    University of Milano Bicocca, Italy.
    Salvato, G.
    IPCF CNR, Italy.
    Tresoldi, D.
    IPCF CNR, Italy.
    Vasi, C.
    IPCF CNR, Italy.
    Tardocchi, M.
    IFP CNR, Italy.
    Neutron radiography as a non-destructive method for diagnosing neutron converters for advanced thermal neutron detectors2016In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 11, no C03033Article in journal (Refereed)
    Abstract [en]

    Due to the well-known problem of He-3 shortage, a series of different thermal neutron detectors alternative to helium tubes are being developed, with the goal to find valid candidates for detection systems for the future spallation neutron sources such as the European Spallation Source (ESS). A possible He-3-free detector candidate is a charged particle detector equipped with a three dimensional neutron converter cathode (3D-C). The 3D-C currently under development is composed by a series of alumina (Al2O3) lamellas coated by 1 mu m of B-10 enriched boron carbide (B4C). In order to obtain a good characterization in terms of detector efficiency and uniformity it is crucial to know the thickness, the uniformity and the atomic composition of the B4C neutron converter coating. In this work a non-destructive technique for the characterization of the lamellas that will compose the 3D-C was performed using neutron radiography. The results of these measurements show that the lamellas that will be used have coating uniformity suitable for detector applications. This technique (compared with SEM, EDX, ERDA, XPS) has the advantage of being global (i.e. non point-like) and non-destructive, thus it is suitable as a check method for mass production of the 3D-C elements.

  • 8.
    Pfeiffer, D.
    et al.
    European Spallat Source ESS AB, Sweden; CERN, Switzerland.
    Resnati, F.
    European Spallat Source ESS AB, Sweden; CERN, Switzerland.
    Birch, Jens
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Etxegarai, M.
    European Spallat Source ESS AB, Sweden.
    Hall-Wilton, R.
    European Spallat Source ESS AB, Sweden; Mid Sweden University, Sweden.
    Höglund, Carina
    Linköping University, Department of Physics, Chemistry and Biology. Linköping University, Faculty of Science & Engineering. European Spallat Source ESS AB, Sweden.
    Hultman, L.
    Mid Sweden University, Sweden.
    Llamas-Jansa, I.
    European Spallat Source ESS AB, Sweden; Institute Energy Technology IFE, Norway.
    Oliveri, E.
    CERN, Switzerland.
    Oksanen, E.
    European Spallat Source ESS AB, Sweden.
    Robinson, L.
    European Spallat Source ESS AB, Sweden.
    Ropelewski, L.
    CERN, Switzerland.
    Schmidt, Susann
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering. European Spallat Source ESS AB, Sweden.
    Streli, C.
    Vienna University of Technology, Austria.
    Thuiner, P.
    CERN, Switzerland; Vienna University of Technology, Austria.
    First measurements with new high-resolution gadolinium-GEM neutron detectors2016In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 11, no P05011Article in journal (Refereed)
    Abstract [en]

    European Spallation Source instruments like the macromolecular diffractometer (NMX) require an excellent neutron detection efficiency, high-rate capabilities, time resolution, and an unprecedented spatial resolution in the order of a few hundred micrometers over a wide angular range of the incoming neutrons. For these instruments solid converters in combination with Micro Pattern Gaseous Detectors (MPGDs) are a promising option. A GEM detector with gadolinium converter was tested on a cold neutron beam at the IFE research reactor in Norway. The mu TPC analysis, proven to improve the spatial resolution in the case of B-10 converters, is extended to gadolinium based detectors. For the first time, a Gd-GEM was successfully operated to detect neutrons with a measured efficiency of 11.8% at a wavelength of 2 angstrom and a position resolution better than 250 mu m.

  • 9.
    Pfeiffer, D.
    et al.
    European Spallat Source ESS AB, Sweden; CERN, Switzerland.
    Resnati, F.
    European Spallat Source ESS AB, Sweden; CERN, Switzerland.
    Birch, Jens
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Hall-Wilton, R.
    European Spallat Source ESS AB, Sweden; Mid Sweden University, Sweden.
    Höglund, Carina
    Linköping University, Department of Physics, Chemistry and Biology. European Spallat Source ESS AB, Sweden.
    Hultman, L.
    Mid Sweden University, Sweden.
    Iakovidis, G.
    CERN, Switzerland; Brookhaven National Lab, NY 11973 USA.
    Oliveri, E.
    CERN, Switzerland.
    Oksanen, E.
    European Spallat Source ESS AB, Sweden.
    Ropelewski, L.
    CERN, Switzerland.
    Thuiner, P.
    CERN, Switzerland; Vienna University of Technology, Austria.
    The mu TPC method: improving the position resolution of neutron detectors based on MPGDs2015In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 10, no P04004Article in journal (Refereed)
    Abstract [en]

    Due to the He-3 crisis, alternatives to the standard neutron detection techniques are becoming urgent. In addition, the instruments of the European Spallation Source (ESS) require advances in the state of the art of neutron detection. The instruments need detectors with excellent neutron detection efficiency, high rate capabilities and unprecedented spatial resolution. The Macromolecular Crystallography instrument (NMX) requires a position resolution in the order of 200 mu m over a wide angular range of incoming neutrons. Solid converters in combination with Micro Pattern Gaseous Detectors (MPGDs) are proposed to meet the new requirements. Charged particles rising from the neutron capture have usually ranges larger than several millimetres in gas. This is apparently in contrast with the requirements for the position resolution. In this paper, we present an analysis technique, new in the field of neutron detection, based on the Time Projection Chamber (TPC) concept. Using a standard Single-GEM with the cathode coated with (B4C)-B-10, we extract the neutron interaction point with a resolution of better than sigma = 200 mu m.

  • 10.
    Piscitelli, F.
    et al.
    European Spallat Source ERIC ESS, Sweden.
    Mauri, G.
    European Spallat Source ERIC ESS, Sweden; Univ Perugia, Italy.
    Messi, F.
    European Spallat Source ERIC ESS, Sweden; Lund Univ, Sweden.
    Anastasopoulos, M.
    European Spallat Source ERIC ESS, Sweden.
    Arnold, T.
    European Spallat Source ERIC ESS, Sweden.
    Glavic, A.
    Paul Scherrer Inst, Switzerland.
    Höglund, Carina
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering. European Spallat Source ERIC ESS, Sweden.
    Ilves, T.
    Lund Univ, Sweden.
    Higuera, I. Lopez
    European Spallat Source ERIC ESS, Sweden.
    Pazmandi, P.
    Wigner Res Ctr Phys, Hungary.
    Raspino, D.
    Rutherford Appleton Lab, England.
    Robinson, L.
    European Spallat Source ERIC ESS, Sweden.
    Schmidt, S.
    European Spallat Source ERIC ESS, Sweden; IHI Ionbond AG, Switzerland.
    Svensson, P.
    European Spallat Source ERIC ESS, Sweden.
    Varga, D.
    Wigner Res Ctr Phys, Hungary.
    Hall-Wilton, R.
    European Spallat Source ERIC ESS, Sweden; Mid Sweden Univ, Sweden.
    Characterization of the Multi-Blade 10B-based detector at the CRISP reflectometer at ISIS for neutron reflectometry at ESS2018In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 13, article id P05009Article in journal (Refereed)
    Abstract [en]

    The Multi-Blade is a Boron-10-based gaseous thermal neutron detector developed to face the challenge arising in neutron reflectometry at neutron sources. Neutron reflectometers are challenging instruments in terms of instantaneous counting rate and spatial resolution. This detector has been designed according to the requirements given by the reflectometers at the European Spallation Source (ESS) in Sweden. The Multi-Blade has been installed and tested on the CRISP reflectometer at the ISIS neutron and muon source in U.K.. The results on the detailed detector characterization are discussed in this manuscript.

  • 11.
    Piscitelli, F.
    et al.
    European Spallat Source ERIC ESS, Sweden.
    Messi, F.
    European Spallat Source ERIC ESS, Sweden; Lund University, Sweden.
    Anastasopoulos, M.
    European Spallat Source ERIC ESS, Sweden.
    Brys, T.
    European Spallat Source ERIC ESS, Sweden.
    Chicken, F.
    European Spallat Source ERIC ESS, Sweden.
    Dian, E.
    European Spallat Source ERIC ESS, Sweden; Hungarian Academic Science, Hungary.
    Fuzi, J.
    Wigner Research Centre Phys, Hungary.
    Höglund, Carina
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering. European Spallat Source ERIC ESS, Sweden.
    Kiss, G.
    Wigner Research Centre Phys, Hungary.
    Orban, J.
    Wigner Research Centre Phys, Hungary.
    Pazmandi, P.
    Wigner Research Centre Phys, Hungary.
    Robinson, Linda
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering. European Spallat Source ERIC ESS, Sweden.
    Rosta, L.
    Wigner Research Centre Phys, Hungary.
    Schmidt, Susann
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering. European Spallat Source ERIC ESS, Sweden.
    Varga, D.
    Wigner Research Centre Phys, Hungary.
    Zsiros, T.
    Wigner Research Centre Phys, Hungary.
    Hall-Wilton, R.
    European Spallat Source ERIC ESS, Sweden; Mid Sweden University, Sweden.
    The Multi-Blade Boron-10-based neutron detector for high intensity neutron reflectometry at ESS2017In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 12, article id P03013Article in journal (Refereed)
    Abstract [en]

    The Multi-Blade is a Boron-10-based gaseous detector introduced to face the challenge arising in neutron reflectometry at pulsed neutron sources. Neutron reflectometers are the most challenging instruments in terms of instantaneous counting rate and spatial resolution. This detector has been designed to cope with the requirements set for the reflectometers at the upcoming European Spallation Source (ESS) in Sweden. Based on previous results obtained at the Institut Laue-Langevin (ILL) in France, an improved demonstrator has been built at ESS and tested at the Budapest Neutron Centre (BNC) in Hungary and at the Source Testing Facility (STF) at the Lund University in Sweden. A detailed description of the detector and the results of the tests are discussed in this manuscript.

  • 12.
    Stefanescu, I.
    et al.
    Technical University of Munich, Germany .
    Abdullahi, Y.
    Technical University of Munich, Germany .
    Birch, Jens
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
    Defendi, I.
    Technical University of Munich, Germany .
    Hall-Wilton, R.
    European Spallat Source ESS AB, Sweden .
    Hoglund, C.
    European Spallat Source ESS AB, Sweden .
    Hultman, Lars
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
    Zee, M.
    Technische Universität München, D-85748 Garching, Germany.
    Zeitelhack, K.
    Technical University of Munich, Germany .
    A B-10-based neutron detector with stacked MultiWire Proportional Counters and macrostructured cathodes2013In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 8, no P12003Article in journal (Refereed)
    Abstract [en]

    We present the results of the measurements of the detection efficiency for a 4.7 angstrom neutron beam incident upon a detector incorporating a stack of up to five MultiWire Proportional Counters (MWPC) with Boron-coated cathodes. The cathodes were made of Aluminum and had a surface exhibiting millimeter-deep V-shaped grooves of 45 degrees, upon which the thin Boron film was deposited by DC magnetron sputtering. The incident neutrons interacting with the converter layer deposited on the sidewalls of the grooves have a higher capture probability, owing to the larger effective absorption film thickness. This leads to a higher overall detection efficiency for the grooved cathode when compared to a cathode with a flat surface. Both the experimental results and the predictions of the GEANT4 model suggests that a 5-counter detector stack with coated grooved cathodes has the same efficiency as a 7-counter stack with flat cathodes. The reduction in the number of counters in the stack without altering the detection efficiency will prove highly beneficial for large-area position-sensitive detectors for neutron scattering applications, for which the cost-effective manufacturing of the detector and associated readout electronics is an important objective. The proposed detector concept could be a technological option for one of the new chopper spectrometers and other instruments planned to be built at the future European Spallation Source in Sweden. These results with macrostructured cathodes generally apply not just to MWPCs but to other gaseous detectors as well.

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