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@ARTICLE{Dickheuer:847895,
      author       = {Dickheuer, Sven and Marchuk, Oleksandr and Brandt,
                      Christian and Pospieszczyk, Albrecht and Goriaev, Andrei and
                      Ialovega, Mykola and Göths, Beatrix and Krasikov, Yury and
                      Krimmer, Andreas and Mertens, Philippe and Kreter, Arkadi},
      title        = {{I}n situ measurements of the spectral reflectance of
                      metallic mirrors at the {H}$_α$ line in a low density
                      {A}r–{H} plasma},
      journal      = {Review of scientific instruments},
      volume       = {89},
      number       = {6},
      issn         = {0034-6748},
      address      = {[S.l.]},
      publisher    = {American Institute of Physics},
      reportid     = {FZJ-2018-03221},
      pages        = {063112 -},
      year         = {2018},
      abstract     = {The efficient and reliable control and monitoring of the
                      quality of the optical properties of mirrors is an open
                      problem in laboratory plasmas. Until now, the measurement of
                      the reflectance of the first mirrors was based on the
                      methods that require additional light calibration sources.
                      We propose a new technique based on the ratio of the red-
                      and blue-shifted emission signals of the reflected hydrogen
                      atoms which enables the in situ measurement of the spectral
                      reflectance of metallic mirrors in low-density Ar–H or
                      Ar–D plasmas. The spectral reflectance coefficients were
                      measured for C, Al, Ag, Fe, Pd, Ti, Sn, Rh, Mo, and W
                      mirrors installed in the linear magnetized plasma device
                      PSI-2 operating in the pressure range of 0.01-0.1 Pa. The
                      results are obtained for the Hα line using the emission of
                      fast atoms induced by excitation of H atoms through Ar at a
                      plasma-solid interface by applying a negative potential U =
                      −80, …, −220 V to the mirror. The agreement between
                      the measured and theoretical data of reflectance is found to
                      be within $10\%$ for the investigated materials (except for
                      C). The spectra also allow us to efficiently determine the
                      material of the mirror.},
      cin          = {IEK-4},
      ddc          = {530},
      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},
      pubmed       = {pmid:29960554},
      UT           = {WOS:000437195200012},
      doi          = {10.1063/1.5024995},
      url          = {https://juser.fz-juelich.de/record/847895},
}