An overview of erosion-deposition studies for the JET Mk II high delta divertor

A. Widdowson, S. Brezinsek, J. P. Coad, D. E. Hole, Jari Likonen, V. Philipps, M. Rubel, M. F. Stamp, JET-EFDA contributors

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Post-mortem analyses of tiles removed from the JET MkII HD divertor in 2007 are presented. The results indicate an increase in deposition at the outer plasma-shadowed region of the divertor, not seen prior to 2004 and indicate a shift away from the asymmetric picture of net deposition at the inner divertor compared with no overall deposition or erosion at the outer divertor. Surface analysis of the inner and outer vertical divertor tiles is largely the same as observed previously; however, a notable increase in Be composition on the inner and outer floor tiles is observed. An attempt has been made to correlate these data with campaign-averaged plasma configurations and spectroscopy results. While some changes in deposition/erosion characteristics can be explained, further detailed analysis of diagnostics and especially of time-resolved data, such as from rotating collector and quartz microbalance diagnostics, is required.
Original languageEnglish
Article number014005
JournalPhysica Scripta
Issue numberT138
DOIs
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

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Erosion
erosion
Tile
tiles
Diagnostics
Plasma
Correlate
Spectroscopy
Rotating
microbalances
accumulators
Vertical
quartz
Configuration
shift
configurations
spectroscopy

Cite this

Widdowson, A., Brezinsek, S., Coad, J. P., Hole, D. E., Likonen, J., Philipps, V., ... contributors, JET-EFDA. (2009). An overview of erosion-deposition studies for the JET Mk II high delta divertor. Physica Scripta, (T138), [014005]. https://doi.org/10.1088/0031-8949/2009/T138/014005
Widdowson, A. ; Brezinsek, S. ; Coad, J. P. ; Hole, D. E. ; Likonen, Jari ; Philipps, V. ; Rubel, M. ; Stamp, M. F. ; contributors, JET-EFDA. / An overview of erosion-deposition studies for the JET Mk II high delta divertor. In: Physica Scripta. 2009 ; No. T138.
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abstract = "Post-mortem analyses of tiles removed from the JET MkII HD divertor in 2007 are presented. The results indicate an increase in deposition at the outer plasma-shadowed region of the divertor, not seen prior to 2004 and indicate a shift away from the asymmetric picture of net deposition at the inner divertor compared with no overall deposition or erosion at the outer divertor. Surface analysis of the inner and outer vertical divertor tiles is largely the same as observed previously; however, a notable increase in Be composition on the inner and outer floor tiles is observed. An attempt has been made to correlate these data with campaign-averaged plasma configurations and spectroscopy results. While some changes in deposition/erosion characteristics can be explained, further detailed analysis of diagnostics and especially of time-resolved data, such as from rotating collector and quartz microbalance diagnostics, is required.",
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Widdowson, A, Brezinsek, S, Coad, JP, Hole, DE, Likonen, J, Philipps, V, Rubel, M, Stamp, MF & contributors, JET-EFDA 2009, 'An overview of erosion-deposition studies for the JET Mk II high delta divertor', Physica Scripta, no. T138, 014005. https://doi.org/10.1088/0031-8949/2009/T138/014005

An overview of erosion-deposition studies for the JET Mk II high delta divertor. / Widdowson, A.; Brezinsek, S.; Coad, J. P.; Hole, D. E.; Likonen, Jari; Philipps, V.; Rubel, M.; Stamp, M. F.; contributors, JET-EFDA.

In: Physica Scripta, No. T138, 014005, 2009.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - An overview of erosion-deposition studies for the JET Mk II high delta divertor

AU - Widdowson, A.

AU - Brezinsek, S.

AU - Coad, J. P.

AU - Hole, D. E.

AU - Likonen, Jari

AU - Philipps, V.

AU - Rubel, M.

AU - Stamp, M. F.

AU - contributors, JET-EFDA

PY - 2009

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AB - Post-mortem analyses of tiles removed from the JET MkII HD divertor in 2007 are presented. The results indicate an increase in deposition at the outer plasma-shadowed region of the divertor, not seen prior to 2004 and indicate a shift away from the asymmetric picture of net deposition at the inner divertor compared with no overall deposition or erosion at the outer divertor. Surface analysis of the inner and outer vertical divertor tiles is largely the same as observed previously; however, a notable increase in Be composition on the inner and outer floor tiles is observed. An attempt has been made to correlate these data with campaign-averaged plasma configurations and spectroscopy results. While some changes in deposition/erosion characteristics can be explained, further detailed analysis of diagnostics and especially of time-resolved data, such as from rotating collector and quartz microbalance diagnostics, is required.

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DO - 10.1088/0031-8949/2009/T138/014005

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