TY - JOUR
T1 - Microscopically nonuniform deposition and deuterium retention in the divertor in JET with ITER-like wall
AU - Bergsåker, H.
AU - Bykov, I.
AU - Petersson, P.
AU - Possnert, G.
AU - Likonen, Jari
AU - Koivuranta, Seppo
AU - Coad, J.P.
AU - van Renterghem, W.
AU - Uytdenhouwen, I.
AU - Widdowson, A.M.
AU - JET-EFDA contributors
N1 - Project code: 104445
PY - 2015
Y1 - 2015
N2 - The divertor surfaces in JET with ITER-like wall (ILW)
have been studied using micro ion beam analysis
(u-IBA) methods and scanning electron microscopy (SEM).
Deposited layers with beryllium as main
constituent had been formed during plasma operations
through 2011-2012. The deuterium trapping
and impurity deposition were non-uniform, frequently
enhanced within pits, cracks and valleys, regions
reaching in size from 10 um to 200 um. The impurity
deposition and fuel retention were correlated with
the surface slope with respect to the direction of ion
incidence. Typically more than 70% of the total
measured areal density of trapped D was found in less
than 30% of the surface area. This is of consequence
for the interpretation of other surface analyses and in
extrapolation from fuel retention in JET with ITERlike
wall and rough divertor surfaces to ITER with smoother
surfaces.
AB - The divertor surfaces in JET with ITER-like wall (ILW)
have been studied using micro ion beam analysis
(u-IBA) methods and scanning electron microscopy (SEM).
Deposited layers with beryllium as main
constituent had been formed during plasma operations
through 2011-2012. The deuterium trapping
and impurity deposition were non-uniform, frequently
enhanced within pits, cracks and valleys, regions
reaching in size from 10 um to 200 um. The impurity
deposition and fuel retention were correlated with
the surface slope with respect to the direction of ion
incidence. Typically more than 70% of the total
measured areal density of trapped D was found in less
than 30% of the surface area. This is of consequence
for the interpretation of other surface analyses and in
extrapolation from fuel retention in JET with ITERlike
wall and rough divertor surfaces to ITER with smoother
surfaces.
UR - https://www.sciencedirect.com/journal/journal-of-nuclear-materials/vol/463/suppl/C
U2 - 10.1016/j.jnucmat.2014.12.015
DO - 10.1016/j.jnucmat.2014.12.015
M3 - Article
SN - 0022-3115
VL - 463
SP - 956
EP - 960
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
ER -