TY  - JOUR
AU  - Seon, Changrae
AU  - Hong, Joohwan
AU  - Song, Inwoo
AU  - Jang, Juhyeok
AU  - Lee, Hyeonyong
AU  - An, Younghwa
AU  - Kim, Bosung
AU  - Jeon, Taemin
AU  - Park, Jaesun
AU  - Choe, Wonho
AU  - Lee, Hyeongon
AU  - Pak, Sunil
AU  - Cheon, MunSeong
AU  - Choi, Jihyeon
AU  - Kim, Hyeonseok
AU  - Biel, Wolfgang
AU  - Bernascolle, Philippe
AU  - Barnsley, Robin
AU  - O’Mullane, Martin
TI  - Design of ITER divertor VUV spectrometer and prototype test at KSTAR tokamak
JO  - The European physical journal / D Atomic, molecular, optical and plasma physics D
VL  - 71
IS  - 12
SN  - 1434-6079
CY  - Heidelberg
PB  - Springer82339
M1  - FZJ-2019-01307
SP  - 313
PY  - 2017
AB  - Design and development of the ITER divertor VUV spectrometer have been performed from the year 1998, and it is planned to be installed in the year 2027. Currently, the design of the ITER divertor VUV spectrometer is in the phase of detail design. It is optimized for monitoring of chord-integrated VUV signals from divertor plasmas, chosen to contain representative lines emission from the tungsten as the divertor material, and other impurities. Impurity emission from overall divertor plasmas is collimated through the relay optics onto the entrance slit of a VUV spectrometer with working wavelength range of 14.6–32 nm. To validate the design of the ITER divertor VUV spectrometer, two sets of VUV spectrometers have been developed and tested at KSTAR tokamak. One set of spectrometer without the field mirror employs a survey spectrometer with the wavelength ranging from 14.6 nm to 32 nm, and it provides the same optical specification as the spectrometer part of the ITER divertor VUV spectrometer system. The other spectrometer with the wavelength range of 5–25 nm consists of a commercial spectrometer with a concave grating, and the relay mirrors with the same geometry as the relay mirrors of the ITER divertor VUV spectrometer. From test of these prototypes, alignment method using backward laser illumination could be verified. To validate the feasibility of tungsten emission measurement, furthermore, the tungsten powder was injected in KSTAR plasmas, and the preliminary result could be obtained successfully with regard to the evaluation of photon throughput
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000417763500001
DO  - DOI:10.1140/epjd/e2017-70825-3
UR  - https://juser.fz-juelich.de/record/860634
ER  -