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First mirror test in JET for ITER: Complete overview after three ILW campaigns
KTH, School of Electrical Engineering and Computer Science (EECS), Fusion Plasma Physics.
2019 (English)In: First mirror test in JET for ITER: Complete overview after three ILW campaigns, 2019, Vol. 19, p. 59-66Conference paper, Published paper (Refereed)
Abstract [en]

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 × 1017 cm−2, W is up to 4.3 × 1017 cm−2, while the content of Ni is the greatest in the outer divertor: 3.8 × 1017 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 × 1016 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.

Place, publisher, year, edition, pages
2019. Vol. 19, p. 59-66
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-247282DOI: 10.1016/j.nme.2019.02.009OAI: oai:DiVA.org:kth-247282DiVA, id: diva2:1298050
Conference
23rd international conference on plasma surface interactions in controlled fusion devices
Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-03-21

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