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@ARTICLE{Neverov:826491,
author = {Neverov, V. S. and Kukushkin, A. B. and Stamp, M. F. and
Alekseev, A. G. and Brezinsek, S. and von Hellermann, M.},
title = {{D}etermination of divertor stray light in high-resolution
main chamber {H} α spectroscopy in {JET}-{ILW}},
journal = {Nuclear fusion},
volume = {57},
number = {1},
issn = {1741-4326},
address = {Vienna},
publisher = {IAEA},
reportid = {FZJ-2017-00715},
pages = {016031 -},
year = {2017},
abstract = {The theoretical model suggested for ITER main chamber H α
spectroscopy is applied to the high-resolution spectroscopy
(HRS) data of recent JET ITER-like wall (ILW) experiments.
The model is aimed at reconstructing the neutral hydrogen
isotope density in the SOL, as well as the isotope ratio, by
solving a multi-parametric inverse problem with allowance
for (i) the strong divertor stray light (DSL) on the
main-chamber lines of sight (LoS), (ii) substantial
deviation of the neutral atom velocity distribution function
(VDF) from a Maxwellian in the SOL, and (iii) data for the
direct observation of the divertor. The JET-ILW HRS data on
resolving the power at the deuterium and hydrogen spectral
lines of the Balmer-alpha series is analysed, with direct
observation of the divertor from the top and with
observation of the inner wall along the tangential and
radial LoS from the equatorial ports. This data allows the
spectrum of the DSL and the signal-to-background ratio for
the Balmer-alpha light emitted from the far SOL and divertor
in the JET-ILW to be evaluated. The results support the
expectation of the strong impact of the DSL upon the ITER
main chamber H α (and visible light) spectroscopy
diagnostics.},
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},
UT = {WOS:000403485000001},
doi = {10.1088/0029-5515/57/1/016031},
url = {https://juser.fz-juelich.de/record/826491},
}