TY  - JOUR
AU  - Huber, A.
AU  - Brezinsek, Sebastijan
AU  - Mertens, Philippe
AU  - Schweer, Bernd
AU  - Sergienko, Gennady
AU  - Terra, Alexis
AU  - Arnoux, G.
AU  - Balshaw, N.
AU  - Clever, Meike
AU  - Edlingdon, T.
AU  - Egner, S.
AU  - Farthing, J.
AU  - Hartl, M.
AU  - Horton, L.
AU  - Kampf, D.
AU  - Klammer, J.
AU  - Lambertz, Horst Toni
AU  - Matthews, G. F.
AU  - Morlock, C.
AU  - Murari, A.
AU  - Reindl, M.
AU  - Riccardo, V.
AU  - Samm, Ulrich
AU  - Sanders, S.
AU  - Stamp, M.
AU  - Williams, J.
AU  - Zastrow, K. D.
AU  - Zauner, C.
AU  - JET-EFDA Contributors
TI  - Development of a Mirror-based Endoscope for Divertor Spectroscopy on JET with the new ITER-like Wall
JO  - Review of scientific instruments
VL  - 83
SN  - 0034-6748
CY  - [S.l.]
PB  - American Institute of Physics
M1  - PreJuSER-23002
SP  - 10D511-1
PY  - 2012
N1  - Record converted from VDB: 12.11.2012
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - pmid:23130790
UR  - <Go to ISI:>//WOS:000311562900030
DO  - DOI:10.1063/1.4731759
UR  - https://juser.fz-juelich.de/record/23002
ER  -