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@ARTICLE{Frerichs:864168,
      author       = {Frerichs, H. and Effenberg, F. and Feng, Y. and Schmitz, O.
                      and Stephey, L. and Reiter, D. and Börner, P.},
      title        = {{R}econstruction of recycling flux from synthetic camera
                      images, evaluated for the {W}endelstein 7-{X} startup
                      limiter},
      journal      = {Nuclear fusion},
      volume       = {57},
      number       = {12},
      issn         = {1741-4326},
      address      = {Vienna},
      publisher    = {IAEA},
      reportid     = {FZJ-2019-04034},
      pages        = {126022 -},
      year         = {2017},
      abstract     = {The interpretation of spectroscopic measurements in the
                      edge region of high-temperature plasmas can be guided by
                      modeling with the EMC3-EIRENE code. A versatile synthetic
                      diagnostic module, initially developed for the generation of
                      synthetic camera images, has been extended for the
                      evaluation of the inverse problem in which the observable
                      photon flux is related back to the originating particle flux
                      (recycling). An application of this synthetic diagnostic to
                      the startup phase (inboard) limiter in Wendelstein 7-X
                      (W7-X) is presented, and reconstruction of recycling from
                      synthetic observation of $ \renewcommand{\ne}{{n_{\rm e}}}
                      \newcommand{\Halpha}{{H_{\alpha}}} \Halpha$ emission is
                      evaluated. It is shown that recycling—in terms of
                      re-ionization within the view cone of the camera—is
                      underestimated by a factor of about 3 at the peak location
                      and overestimated in between, and that $
                      \renewcommand{\ne}{{n_{\rm e}}}
                      \newcommand{\Halpha}{{H_{\alpha}}} \Halpha$ emission related
                      to molecular dissociation can locally yield an additional
                      factor of 2 for the ionization to photon conversion. Fitted
                      conversion factors are extracted from the simulation results
                      which include a dependence on the plasma density.},
      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:000411581100001},
      doi          = {10.1088/1741-4326/aa8515},
      url          = {https://juser.fz-juelich.de/record/864168},
}