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@ARTICLE{Huber:23002,
      author       = {Huber, A. and Brezinsek, Sebastijan and Mertens, Philippe
                      and Schweer, Bernd and Sergienko, Gennady and Terra, Alexis
                      and Arnoux, G. and Balshaw, N. and Clever, Meike and
                      Edlingdon, T. and Egner, S. and Farthing, J. and Hartl, M.
                      and Horton, L. and Kampf, D. and Klammer, J. and Lambertz,
                      Horst Toni and Matthews, G. F. and Morlock, C. and Murari,
                      A. and Reindl, M. and Riccardo, V. and Samm, Ulrich and
                      Sanders, S. and Stamp, M. and Williams, J. and Zastrow, K.
                      D. and Zauner, C. and JET-EFDA Contributors},
      title        = {{D}evelopment of a {M}irror-based {E}ndoscope for
                      {D}ivertor {S}pectroscopy on {JET} with the new {ITER}-like
                      {W}all},
      journal      = {Review of scientific instruments},
      volume       = {83},
      issn         = {0034-6748},
      address      = {[S.l.]},
      publisher    = {American Institute of Physics},
      reportid     = {PreJuSER-23002},
      pages        = {10D511-1},
      year         = {2012},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {A new endoscope with optimised divertor view has been
                      developed in order to survey and monitor the emission of
                      specific impurities such as tungsten and the remaining
                      carbon as well as beryllium in the tungsten divertor of JET
                      after the implementation of the ITER-like wall in 2011. The
                      endoscope is a prototype for testing an ITER relevant design
                      concept based on reflective optics only. It may be subject
                      to high neutron fluxes as expected in ITER. The operating
                      wavelength range, from 390 nm to 2500 nm, allows the
                      measurements of the emission of all expected impurities (W
                      I, Be II, C I, C II, C III) with high optical transmittance
                      $(≥30\%$ in the designed wavelength range) as well as high
                      spatial resolution that is ≤2 mm at the object plane and
                      ≤3 mm for the full depth of field (±0.7 m). The new
                      optical design includes options for in situ calibration of
                      the endoscope transmittance during the experimental
                      campaign, which allows the continuous tracing of possible
                      transmittance degradation with time due to impurity
                      deposition and erosion by fast neutral particles. In
                      parallel to the new optical design, a new type of possibly
                      ITER relevant shutter system based on pneumatic techniques
                      has been developed and integrated into the endoscope head.
                      The endoscope is equipped with four digital CCD cameras,
                      each combined with two filter wheels for narrow band
                      interference and neutral density filters. Additionally, two
                      protection cameras in the λ > 0.95 μm range have been
                      integrated in the optical design for the real time wall
                      protection during the plasma operation of JET.},
      cin          = {IEK-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {Fusion},
      pid          = {G:(DE-Juel1)FUEK403},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:23130790},
      UT           = {WOS:000311562900030},
      doi          = {10.1063/1.4731759},
      url          = {https://juser.fz-juelich.de/record/23002},
}