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@MASTERSTHESIS{Kumar:840073,
      author       = {Kumar, Shashank},
      title        = {{A}ssessment of changes in the electro-optical performance
                      of {S}ilicon {P}hotomultiplier ({S}i{PM}) modules after
                      irradiation with cold neutrons},
      volume       = {4404},
      school       = {Duisburg Univ.},
      type         = {Masterarbeit},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2017-07637, Juel-4404},
      series       = {Berichte des Forschungszentrums Jülich},
      pages        = {65 p.},
      year         = {2017},
      note         = {Masterarbeit, Duisburg Univ., 2017},
      abstract     = {The detection and measurement of neutrons are vital in a
                      wide range of fields including homeland security, radiation
                      protection and scientific research. Small-angle neutron
                      scattering (SANS) experiments have become important
                      techniques in the investigation of the material properties
                      on the atomic scale. For a long period $^{3}$He based
                      detectors were extensively used for neutron detection in
                      these experiments, but due to the scarcity of $^{3}$He,
                      researchers started to look for alternatives. 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 investigated sample structure can be determined with
                      very high spatial resolution. These experiments using
                      scintillation based detectors rely on efficient detection of
                      photons, hence on the performance of photodetectors. Silicon
                      photomultipliers (SiPM), having lower bias voltages compared
                      to photomultiplier tubes (PMTs), being able to operate in
                      high magnetic fields, offering the possibility of modular
                      design, and yielding higher readout rates have the potential
                      to become a photon detector of choice in these experiments.
                      The concern regarding SiPMs to be used in these experiments
                      is especially their neutron radiation hardness. When exposed
                      to the neutron irradiation, the amount of defects caused by
                      the impinging neutrons increases the dark count rate and
                      diminishes the photon detection efficiency in the SiPM.In
                      order to study the performance degradation of SiPMs due to
                      neutron irradiation, three different SiPM modules (two
                      analog SiPM arrays provided by manufacturers
                      $\textit{SensL}$ and $\textit{Hamamatsu Corporation}$ and
                      one digital array by $\textit{Philips Digital Photon
                      Counting GmbH}$), were irradiated at the KWS-1 instrument of
                      the $\textit{Heinz Maier-Leibniz (MLZ)}$ research reactor in
                      Garching, Germany with cold neutrons having a
                      5$\mathring{A}$ wavelength. The scope of this work is to
                      perform a quantitative comparison of the photodetection
                      efficiency (PDE) for these SiPM technologies before and
                      after irradiation with cold neutrons and assess the
                      feasibility of the SiPM as the technology of choice for
                      scintillation-based photodetectors.},
      cin          = {ZEA-2},
      cid          = {I:(DE-Juel1)ZEA-2-20090406},
      pnm          = {899 - ohne Topic (POF3-899) / HITEC - Helmholtz
                      Interdisciplinary Doctoral Training in Energy and Climate
                      Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-899 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)29 / PUB:(DE-HGF)19},
      url          = {https://juser.fz-juelich.de/record/840073},
}