TY  - JOUR
AU  - Neubauer, Olaf
AU  - Charl, Anton
AU  - Czymek, Guntram
AU  - Gao, Yu
AU  - Knaup, Martin
AU  - König, Ralf
AU  - Krychowiak, Maciej
AU  - Lambertz, Horst-Toni
AU  - Lennartz, M.
AU  - Linsmeier, Christian
AU  - Satheeswaran, G.
AU  - Schweer, Bernd
AU  - Schülke, Mathias
AU  - Sereda, Stepan
TI  - Endoscopes for observation of plasma-wall interactions in the divertor of Wendelstein 7-X
JO  - Fusion engineering and design
VL  - 146
SN  - 0920-3796
CY  - New York, NY [u.a.]
PB  - Elsevier
M1  - FZJ-2019-04300
SP  - 19 - 22
PY  - 2019
AB  - The stellarator Wendelstein 7-X is being prepared for long pulse operation. This includes diagnostics for investigation of plasma wall interaction processes. A versatile optical observation system has been developed for local characterization of the divertor plasma and the divertor target surface. The optical systems consist of two endoscopes each with perpendicular fields of view and the opportunity of tomographic reconstruction. Mirror based optics has been chosen in order to assure good optical properties independent of the wavelength. A narrow field of view allows for high spatial resolution while rotation of the first mirror covers the full poloidal divertor sections. An integrated shutter mechanism and a vacuum window far back minimize coating of optical components. For assessment of change of light transmission, a relative calibration function is implemented. The output light is split into wavelength ranges. Both, cameras equipped with narrow band filters as well as spectrometers are connected. The first endoscope was mounted at W7-X after successfully passing mechanical, optical and functional tests.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000488307400006
DO  - DOI:10.1016/j.fusengdes.2018.11.009
UR  - https://juser.fz-juelich.de/record/864589
ER  -