TY - JOUR
T1 - First mirror test in JET for ITER
T2 - Complete overview after three ILW campaigns
AU - JET Contributors
AU - Mlynar, Jan
AU - Craciunescu, Teddy
AU - Ferreira, Diogo R.
AU - Carvalho, Pedro
AU - Ficker, Ondrej
AU - Grover, Ondrej
AU - Imrisek, Martin
AU - Svoboda, Jakub
AU - Abduallev, S.
AU - Abhangi, M.
AU - Abreu, P.
AU - Afzal, M.
AU - Aggarwal, K. M.
AU - Ahlgren, T.
AU - Ahn, J. H.
AU - Aho-Mantila, L.
AU - Aiba, N.
AU - Airila, M.
AU - Albanese, R.
AU - Aldred, V.
AU - Alegre, D.
AU - Alessi, E.
AU - Aleynikov, P.
AU - Alfier, A.
AU - Alkseev, A.
AU - Allinson, M.
AU - Alper, B.
AU - Alves, E.
AU - Ambrosino, G.
AU - Ambrosino, R.
AU - Amicucci, L.
AU - Amosov, V.
AU - Sunden, E. Andersson
AU - Angelone, M.
AU - Björkas, C.
AU - Chang, C. S.
AU - Gao, X.
AU - Gao, Y.
AU - Harrison, J.
AU - Lahtinen, A.
AU - Liu, Y.
AU - Nordlund, K.
AU - Patel, A.
AU - Ranjan, S.
AU - Safi, E.
AU - Wu, J.
AU - Zhou, Y.
AU - Sipila , S. K.
AU - Asunta, O.
AU - Groth, M.
AU - Hakola, A.
AU - Karhunen, J.
AU - Koivuranta, S.
AU - Kurki-Suonio, T.
AU - Lomanowski, B.
AU - Lonnroth, J.
AU - Salmi, A.
AU - Santala, M. I. K.
AU - Varje, J.
AU - Siren, P.
AU - Likonen, J.
AU - Kirschner, A.
AU - Järvinen, A.
AU - Moon, Sunwoo
PY - 2019/5
Y1 - 2019/5
N2 - The First Mirror Test for ITER has been carried out in JET with mirrors exposed during: (i) the third ILW campaign (ILW-3, 2015-2016, 23.33 h plasma) and (ii) all three campaigns, i.e. ILW-1 to ILW-3: 2011-2016, 63,52 h in total. All mirrors from main chamber wall show no significant changes of the total reflectivity from the initial value and the diffuse reflectivity does not exceed 3% in the spectral range above 500 nm. The modified layer on surface has very small amount of impurities such as D, Be, C, N, O and Ni. All mirrors from the divertor (inner, outer, base under the bulk W tile) lost reflectivity by 20-80% due to the beryllium-rich deposition also containing D, C, N, O, Ni and W. In the inner divertor N reaches 5 x 10(17) cm(-2), W is up to 4.3 x 10(17) cm(-2), while the content of Ni is the greatest in the outer divertor: 3.8 x 10(17) cm(-2). Oxygen-18 used as the tracer in experiments at the end of ILW-3 has been detected at the level of 1.1 x 10(16) cm(-2). The thickness of deposited layer is in the range of 90 nm to 900 nm. The layer growth rate in the base (2.7 pm s(-1)) and inner divertor is proportional to the exposure time when a single campaign and all three are compared. In a few cases, on mirrors located at the cassette mouth, flaking of deposits and erosion occurred.
AB - The First Mirror Test for ITER has been carried out in JET with mirrors exposed during: (i) the third ILW campaign (ILW-3, 2015-2016, 23.33 h plasma) and (ii) all three campaigns, i.e. ILW-1 to ILW-3: 2011-2016, 63,52 h in total. All mirrors from main chamber wall show no significant changes of the total reflectivity from the initial value and the diffuse reflectivity does not exceed 3% in the spectral range above 500 nm. The modified layer on surface has very small amount of impurities such as D, Be, C, N, O and Ni. All mirrors from the divertor (inner, outer, base under the bulk W tile) lost reflectivity by 20-80% due to the beryllium-rich deposition also containing D, C, N, O, Ni and W. In the inner divertor N reaches 5 x 10(17) cm(-2), W is up to 4.3 x 10(17) cm(-2), while the content of Ni is the greatest in the outer divertor: 3.8 x 10(17) cm(-2). Oxygen-18 used as the tracer in experiments at the end of ILW-3 has been detected at the level of 1.1 x 10(16) cm(-2). The thickness of deposited layer is in the range of 90 nm to 900 nm. The layer growth rate in the base (2.7 pm s(-1)) and inner divertor is proportional to the exposure time when a single campaign and all three are compared. In a few cases, on mirrors located at the cassette mouth, flaking of deposits and erosion occurred.
KW - 114 Physical sciences
U2 - 10.1016/j.nme.2019.02.009
DO - 10.1016/j.nme.2019.02.009
M3 - Article
VL - 19
SP - 59
EP - 66
JO - Nuclear Materials and Energy
JF - Nuclear Materials and Energy
SN - 2352-1791
ER -