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@ARTICLE{Huber:864236,
      author       = {Huber, Alexander and Kinna, D. and Matthews, G. F. and
                      Sergienko, G. and Balboa, I. and Brezinsek, S. and Lomas, P.
                      J. and Mailloux, J. and McCullen, P. and Mertens, Ph. and
                      Rimini, F. G. and Silburn, S. and Valcarcel, D. and Zastrow,
                      K.-D.},
      title        = {{T}he software and hardware architecture of the real-time
                      protection of in-vessel components in {JET}-{ILW}},
      journal      = {Nuclear fusion},
      volume       = {59},
      number       = {7},
      issn         = {1741-4326},
      address      = {Vienna},
      publisher    = {IAEA},
      reportid     = {FZJ-2019-04070},
      pages        = {076016 -},
      year         = {2019},
      abstract     = {For the first time, the JET operation in
                      deuterium–tritium (D–T) plasma, which is scheduled to
                      take place on JET in 2020, will be performed in the ITER mix
                      of plasma-facing component materials. In view of the
                      preparation of the DT campaign (DTE2), several aspects of
                      the plasma operation require significant improvements, such
                      as a real-time protection of the first wall. The risk of
                      damaging the metallic PFCs caused by beryllium melting or
                      cracking of tungsten owing to thermal fatigue required a new
                      reliable D–T compatible active protection system.
                      Therefore, the future development of the JET real time first
                      wall protection is focused on the D–T campaign and the
                      ITER relevant conditions which may cause failure of camera
                      electronics within the Torus hall. In addition to the
                      technological aspect, the intensive preparation of the
                      diverse software tools and real time algorithms for hot spot
                      detection as well as alarm handling strategy required for
                      the wall protection is in progress.This contribution
                      describes the improved design, implementation, and operation
                      of the near infrared (NIR) imaging diagnostic system of the
                      JET-ILW plasma experiment and its integration into the
                      existing JET protection architecture. To provide the
                      reliable wall protection during the DTE2, two more sensitive
                      logarithmic NIR camera systems equipped with new optical
                      relays to take images and cameras outside of the biological
                      shield have been installed on JET-ILW and calibrated with an
                      in-vessel calibration light source (ICLS). Additionally,
                      post-pulse data visualization and advanced analysis of all
                      types of imaging data is provided by the new software
                      framework JUVIL (JET users video imaging library). The
                      formation of hot spots is recognized as a significant threat
                      due to rapid surface temperature rise. Because it could
                      trigger the protection system to stop a pulse, it is
                      important to identify the mechanisms and conditions
                      responsible for the formation of such hot spots. To address
                      this issue the new software tool 'Hotspot Editor' has been
                      developed.},
      cin          = {IEK-4},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {174 - Plasma-Wall-Interaction (POF3-174)},
      pid          = {G:(DE-HGF)POF3-174},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000469801800004},
      doi          = {10.1088/1741-4326/ab1a79},
      url          = {https://juser.fz-juelich.de/record/864236},
}