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@ARTICLE{Mller:861610,
      author       = {Möller, Sören and Hubeny, Michael and Unterberg, Bernhard
                      and Wegener, Tobias and Reinhart, Michael and Kreter, Arkadi
                      and Petersson, Per},
      title        = {{P}lasma impurities in linear, hot cathode, arc-plasma
                      devices studied with {D}2 and {H}e-plasmas in {PSI}-2},
      reportid     = {FZJ-2019-02056},
      year         = {2019},
      abstract     = {Linear plasma devices are being used for studies of
                      plasma-surface interaction. Hot-cathode arc-discharge
                      devices such as PSI-2 can provide flux densities in the
                      $10^23$ ions/m²s order at electron temperatures of 1-20eV.
                      In magnetic confinement nuclear fusion science, linear
                      plasma devices are employed instead of confinement devices
                      due to their well-defined conditions and similar plasma
                      parameters as observed in tokamak edge plasmas. This study
                      aims to further improve the knowledge of the exposure
                      conditions by analysing impurities unintentionally released
                      into the PSI-2 plasma and their subsequent deposition on
                      target surfaces. The analysis is conducted with D2 and He
                      plasmas using Langmuir probes and surface analysis of Si
                      catcher samples. Deposited impurity fluxes up to
                      $2*10^17/m²s=6µg/m²s$ or about $10^-5$ of the plasma flux
                      density are found. Oxygen constitutes about $90atom\%$ to
                      the impurities. Experiments with two leak rates indicate a
                      connection between base pressure and oxygen deposition rate.
                      Modelling points on the residual gas, cathode, Mo-anode, and
                      the steel vacuum vessel as impurity sources. Implications of
                      the impurity fluxes for hydrogen retention, mass-loss, and
                      sputtering related studies are derived.},
      cin          = {IEK-4 / IEK-1},
      cid          = {I:(DE-Juel1)IEK-4-20101013 / I:(DE-Juel1)IEK-1-20101013},
      pnm          = {174 - Plasma-Wall-Interaction (POF3-174)},
      pid          = {G:(DE-HGF)POF3-174},
      typ          = {PUB:(DE-HGF)25},
      url          = {https://juser.fz-juelich.de/record/861610},
}