TY - JOUR
T1 - Analysis of rotating collectors from the private region of JET with carbon wall and metallic ITER-like wall
AU - Beal, J.
AU - Widdowson, A.
AU - Heinola, K.
AU - Baron-Wiechec, A.
AU - Gibson, K.J.
AU - Coad, J.P.
AU - Alves, E.
AU - Lipschultz, B.
AU - Kirschner, A.
AU - Matthews, G.F.
AU - Brezinsek, S.
AU - JET-EFDA contributors
PY - 2015
Y1 - 2015
N2 - Rotating collectors are used in JET to provide
time-resolved measurements of erosion and redeposition of
vessel materials. The silicon collecting discs rotate
behind an aperture, driven by pulsing of the toroidal
magnetic field, with the deposits analysed ex-situ by
nuclear reaction analysis. The angular dependence of
deposition is mapped to discharge number using the
B-field history, allowing the influence of different
plasma configurations and parameters to be investigated.
A simple geometrical model using sputtering and
reflection from the strike point has qualitatively
reproduced the deposition found on collectors located
under the central divertor tile and facing towards the
inner strike point. The beryllium deposition on the
ITER-like wall (ILW) collector showed an order of
magnitude reduction in deposition compared to carbon
deposition on the JET-C collector. This decreased
deposition is attributed to low long range divertor
transport due to reduced chemical sputtering/erosion and
codeposition of beryllium relative to carbon.
AB - Rotating collectors are used in JET to provide
time-resolved measurements of erosion and redeposition of
vessel materials. The silicon collecting discs rotate
behind an aperture, driven by pulsing of the toroidal
magnetic field, with the deposits analysed ex-situ by
nuclear reaction analysis. The angular dependence of
deposition is mapped to discharge number using the
B-field history, allowing the influence of different
plasma configurations and parameters to be investigated.
A simple geometrical model using sputtering and
reflection from the strike point has qualitatively
reproduced the deposition found on collectors located
under the central divertor tile and facing towards the
inner strike point. The beryllium deposition on the
ITER-like wall (ILW) collector showed an order of
magnitude reduction in deposition compared to carbon
deposition on the JET-C collector. This decreased
deposition is attributed to low long range divertor
transport due to reduced chemical sputtering/erosion and
codeposition of beryllium relative to carbon.
U2 - 10.1016/j.jnucmat.2014.09.069
DO - 10.1016/j.jnucmat.2014.09.069
M3 - Article
SN - 0022-3115
VL - 463
SP - 818
EP - 821
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
ER -
