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@ARTICLE{Drenik:835989,
      author       = {Drenik, Aleksander and Alegre, Daniel and Brezinsek,
                      Sebastijan and Castro, Alfonso de and Kruezi, Uron and
                      Meisl, Gerd and Mozetic, Miran and Oberkofler, Martin and
                      Panjan, Matjaz and Primc, Gregor and Resnik, Matic and
                      Rohde, Volker and Seibt, Michael and Tabarés, Francisco L.
                      and Zaplotnik, Rok},
      title        = {{D}etection of ammonia by residual gas analysis in {AUG}
                      and {JET}},
      journal      = {Fusion engineering and design},
      volume       = {124},
      issn         = {0920-3796},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2017-05114},
      pages        = {239-243},
      year         = {2017},
      abstract     = {Nitrogen seeding, necessary for divertor heat-load
                      mitigation in ITER, has been shown to lead to ammonia
                      formation which would be a severe operational and safety
                      issue in ITER. Predictions of ammonia production in ITER are
                      based on data from present day fusion devices. Ammonia is
                      mainly detected by residual gas analysis (RGA). Detection of
                      ammonia is impeded by the presence of water and methane
                      which, in a mixed H-D system, leave signatures in the same
                      range of the mass spectra. A statistical model is used to
                      ascribe an average isotope ratio to each gaseous species.
                      The model is tested with simulated RGA recordings with
                      varying concentration of ammonia to evaluate the sensitivity
                      to fitting parameter boundaries, noise in the recordings and
                      mis-matching cracking patterns. The analysis shows that the
                      fitting procedure may in some occasions substitute species
                      among each other, resulting in faulty concentrations.
                      Nevertheless, the right choice of parameter boundaries
                      ensures correct fitting results. Finally, the fitting
                      procedure is applied to experimental data from
                      nitrogen-seeeded discharges at AUG and JET.},
      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:000419411900051},
      doi          = {10.1016/j.fusengdes.2017.05.037},
      url          = {https://juser.fz-juelich.de/record/835989},
}