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@INPROCEEDINGS{Kumar:841876,
      author       = {Kumar, Shashank and Durini, Daniel and Degenhardt, Carsten
                      and van Waasen, Stefan},
      title        = {{P}hotodetection characterisation of {S}i{PM} technologies
                      for their application in scintillator based neutron
                      detectors},
      reportid     = {FZJ-2018-00173},
      year         = {2017},
      abstract     = {Small angle neutron scattering (SANS) experiments have
                      become one of the mostly used techniques in the
                      investigation of the properties of material on the atomic
                      scale. Till 2001 3He based detectors were extensively used
                      for neutron detection in these experiments, but due to the
                      scarcity of 3He researchers started to look for alternatives
                      [1]. Scintillation based solid state detectors appeared as a
                      prominent alternative. A neutron scattered by a sample under
                      test impinges a scintillating material and initiates a
                      nuclear reaction that produces secondary particles which in
                      a second scattering process generate a light emission that
                      can be detected by an underlying photodetector. By
                      determining the neutron scattering angle, the momentum
                      transfer of the scattered neutron can be identified. Using
                      this information the sample structure can be determined with
                      very high spatial resolution [2].Silicon photomultipliers
                      (SiPM), having lower bias voltages compared to
                      photomultiplier tubes, insensitivity to a magnetic field,
                      the possibility of modular design and higher readout rates,
                      have the potential of becoming a photon detector of choice
                      in these experiments. In a previous investigation, the
                      increase of the dark signal due to irradiation of the SiPM
                      with cold neutrons has been quantified and this technology
                      proved feasible for this kind of applications [2]. Here, a
                      detailed comparative analysis of photon detection efficiency
                      (PDE) for three different SiPM technologies, before and
                      after irradiation with cold neutrons, has been carried out.
                      For this purpose, we irradiated one digital and two
                      different analog SiPM arrays with cold neutrons having 5Å
                      wavelength and up to a dose of 6E12 n/cm2 at the KWS-1
                      instrument of the Heinz Maier-Leibnitz Zentrum (MLZ) in
                      Garching, Germany. As stated in [2] a dose for a 10-year
                      equivalent non-stop operation of the detector at the KWS-1
                      instrument of the MLZ is expected to be around 8.2E9 n/cm2.
                      We have used a customized measuring system for evaluating
                      the PDE of the sensors. The used system consists of a
                      monochromatic light source and a lock-in amplifier based
                      readout for the wavelengths between UV and NIR parts of the
                      spectra.The first result can be observed in Fig.1 where a
                      relative change of $3.8\%$ in the PDE has been measured on
                      the digital SiPM array after being irradiated up to 1.85E12
                      n/cm2.},
      month         = {Jul},
      date          = {2018-07-02},
      organization  = {19th International Workshop on
                       Radiation Imaging Detectors, Krakow
                       (Poland), 2 Jul 2018 - 6 Jul 2018},
      subtyp        = {After Call},
      cin          = {ZEA-2},
      cid          = {I:(DE-Juel1)ZEA-2-20090406},
      pnm          = {632 - Detector technology and systems (POF3-632) / HITEC -
                      Helmholtz Interdisciplinary Doctoral Training in Energy and
                      Climate Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-632 / G:(DE-Juel1)HITEC-20170406},
      experiment   = {EXP:(DE-MLZ)KWS1-20140101},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/841876},
}