This title appears in the Scientific Report :
2017
Please use the identifier:
http://dx.doi.org/10.1088/0031-8949/T167/1/014052 in citations.
Deposition in the inner and outer corners of the JET divertor with carbon wall and metallic ITER-like wall
Deposition in the inner and outer corners of the JET divertor with carbon wall and metallic ITER-like wall
Rotating collectors and quartz microbalances (QMBs) are used in JET to provide time-dependent measurements of erosion and deposition. Rotation of collector discs behind apertures allows recording of the long term evolution of deposition. QMBs measure mass change via the frequency deviations of vibra...
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Personal Name(s): | Beal, J. (Corresponding author) |
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Widdowson, A. / Heinola, K. / Baron-Wiechec, A. / Gibson, K. J. / Coad, J. P. / Alves, E. / Lipschultz, B. / Kirschner, Andreas / Esser, H. G. / Matthews, G. F. / Brezinsek, S. / Contributors, JET | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Published in: | Physica scripta, T167 (2016) S. 014052 - |
Imprint: |
Bristol
IoP Publ.
2016
|
DOI: |
10.1088/0031-8949/T167/1/014052 |
Document Type: |
Journal Article |
Research Program: |
Plasma-Wall-Interaction |
Publikationsportal JuSER |
Rotating collectors and quartz microbalances (QMBs) are used in JET to provide time-dependent measurements of erosion and deposition. Rotation of collector discs behind apertures allows recording of the long term evolution of deposition. QMBs measure mass change via the frequency deviations of vibrating quartz crystals. These diagnostics are used to investigate erosion/deposition during JET-C carbon operation and JET-ILW (ITER-like wall) beryllium/tungsten operation. A simple geometrical model utilising experimental data is used to model the time-dependent collector deposition profiles, demonstrating good qualitative agreement with experimental results. Overall, the JET-ILW collector deposition is reduced by an order of magnitude relative to JET-C, with beryllium replacing carbon as the dominant deposit. However, contrary to JET-C, in JET-ILW there is more deposition on the outer collector than the inner. This reversal of deposition asymmetry is investigated using an analysis of QMB data and is attributed to the different chemical properties of carbon and beryllium. |