First mirror test in JET for ITER: Complete overview after three ILW campaigns

JET Contributors; Jan Mlynar; T. Ahlgren; L. Aho-Mantila; M. Airila; C. Björkas; A. Lahtinen; K. Nordlund; E. Safi; S. K. Sipila; O. Asunta; M. Groth; A. Hakola; J. Karhunen; S. Koivuranta; T. Kurki-Suonio; B. Lomanowski; J. Lonnroth; A. Salmi; M. I. K. Santala; J. Varje; P. Siren; J. Likonen; A. Järvinen; Sunwoo Moon

doi:10.1016/j.nme.2019.02.009

First mirror test in JET for ITER: Complete overview after three ILW campaigns

JET Contributors, Jan Mlynar, T. Ahlgren, L. Aho-Mantila, M. Airila, C. Björkas, A. Lahtinen, K. Nordlund, E. Safi, S. K. Sipila , O. Asunta, M. Groth, A. Hakola, J. Karhunen, S. Koivuranta, T. Kurki-Suonio, B. Lomanowski, J. Lonnroth, A. Salmi, M. I. K. SantalaJ. Varje, P. Siren, J. Likonen, A. Järvinen, Sunwoo Moon

Research output: Contribution to journal › Article › Scientific › peer-review

Abstract

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.

Original language	English
Journal	Nuclear Materials and Energy
Volume	19
Pages (from-to)	59-66
Number of pages	8
ISSN	2352-1791
DOIs	https://doi.org/10.1016/j.nme.2019.02.009
Publication status	Published - May 2019
MoE publication type	A1 Journal article-refereed

Fields of Science

114 Physical sciences

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Cite this

JET Contributors, Mlynar, J., Ahlgren, T., Aho-Mantila, L., Airila, M., Björkas, C., Lahtinen, A., Nordlund, K., Safi, E., Sipila , S. K., Asunta, O., Groth, M., Hakola, A., Karhunen, J., Koivuranta, S., Kurki-Suonio, T., Lomanowski, B., Lonnroth, J., Salmi, A., ... Moon, S. (2019). First mirror test in JET for ITER: Complete overview after three ILW campaigns. Nuclear Materials and Energy, 19, 59-66. https://doi.org/10.1016/j.nme.2019.02.009

@article{83983aad57b04e31abe580a857b9b269,

title = "First mirror test in JET for ITER: Complete overview after three ILW campaigns",

abstract = "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.",

keywords = "114 Physical sciences",

author = "{JET Contributors} and Jan Mlynar and Teddy Craciunescu and Ferreira, {Diogo R.} and Pedro Carvalho and Ondrej Ficker and Ondrej Grover and Martin Imrisek and Jakub Svoboda and S. Abduallev and M. Abhangi and P. Abreu and M. Afzal and Aggarwal, {K. M.} and T. Ahlgren and Ahn, {J. H.} and L. Aho-Mantila and N. Aiba and M. Airila and R. Albanese and V. Aldred and D. Alegre and E. Alessi and P. Aleynikov and A. Alfier and A. Alkseev and M. Allinson and B. Alper and E. Alves and G. Ambrosino and R. Ambrosino and L. Amicucci and V. Amosov and Sunden, {E. Andersson} and M. Angelone and C. Bj{\"o}rkas and Chang, {C. S.} and X. Gao and Y. Gao and J. Harrison and A. Lahtinen and Y. Liu and K. Nordlund and A. Patel and S. Ranjan and E. Safi and J. Wu and Y. Zhou and Sipila, {S. K.} and O. Asunta and M. Groth and A. Hakola and J. Karhunen and S. Koivuranta and T. Kurki-Suonio and B. Lomanowski and J. Lonnroth and A. Salmi and Santala, {M. I. K.} and J. Varje and P. Siren and J. Likonen and A. Kirschner and A. J{\"a}rvinen and Sunwoo Moon",

year = "2019",

month = may,

doi = "10.1016/j.nme.2019.02.009",

language = "English",

volume = "19",

pages = "59--66",

journal = "Nuclear Materials and Energy",

issn = "2352-1791",

publisher = "Elsevier Ltd. ",

}

JET Contributors, Mlynar, J, Ahlgren, T, Aho-Mantila, L, Airila, M, Björkas, C, Lahtinen, A , Nordlund, K, Safi, E, Sipila , SK, Asunta, O, Groth, M, Hakola, A, Karhunen, J, Koivuranta, S, Kurki-Suonio, T, Lomanowski, B, Lonnroth, J, Salmi, A, Santala, MIK, Varje, J, Siren, P, Likonen, J, Järvinen, A & Moon, S 2019, 'First mirror test in JET for ITER: Complete overview after three ILW campaigns', Nuclear Materials and Energy, vol. 19, pp. 59-66. https://doi.org/10.1016/j.nme.2019.02.009

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 -