Overview of JET post-mortem results following the 2007-9 operational period, and comparisons with previous campaigns

J.P. Coad, S. Gruenhagen, D.E. Hole, Antti Hakola, Seppo Koivuranta, Jari Likonen, M. Rubel, M. Stamp, A. Widdowson, JET-EFDA contributors

Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

Abstract

In 2010, all the plasma-facing components were removed from JET so that the carbon-based surfaces could be replaced with beryllium (Be) or tungsten as part of the ITER-like wall (ILW) project.
This gives unprecedented opportunities for post-mortem analyses of these plasma-facing surfaces; this paper reviews the data obtained so far and relates the information to studies of tiles removed during previous JET shutdowns. The general pattern of erosion/deposition at the JET divertor has been maintained, with deposition of impurities in the scrape-off layer (SOL) at the inner divertor and preferential removal of carbon and transport into the corner. However, the remaining films in the SOL contain very high Be/C ratios at the surface.
The first measurements of erosion using a tile profiler have been completed, with up to 200 microns erosion being recorded at points on the inner wall guard limiters.
Original languageEnglish
Number of pages6
JournalPhysica Scripta
Volume2011
Issue numberT145
DOIs
Publication statusPublished - 2011
MoE publication typeA4 Article in a conference publication
Event13th International Workshop on Plasma-Facing Materials and Components for Fusion Applications, PFMC-13 - Rosenheim, Germany
Duration: 9 May 201113 May 2011

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Erosion
erosion
tiles
Tile
beryllium
Carbon
Plasma
shutdowns
Limiter
carbon
Impurities
tungsten
impurities

Cite this

Coad, J.P. ; Gruenhagen, S. ; Hole, D.E. ; Hakola, Antti ; Koivuranta, Seppo ; Likonen, Jari ; Rubel, M. ; Stamp, M. ; Widdowson, A. ; contributors, JET-EFDA. / Overview of JET post-mortem results following the 2007-9 operational period, and comparisons with previous campaigns. In: Physica Scripta. 2011 ; Vol. 2011, No. T145.
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Overview of JET post-mortem results following the 2007-9 operational period, and comparisons with previous campaigns. / Coad, J.P.; Gruenhagen, S.; Hole, D.E.; Hakola, Antti; Koivuranta, Seppo; Likonen, Jari; Rubel, M.; Stamp, M.; Widdowson, A.; contributors, JET-EFDA.

In: Physica Scripta, Vol. 2011, No. T145, 2011.

Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

TY - JOUR

T1 - Overview of JET post-mortem results following the 2007-9 operational period, and comparisons with previous campaigns

AU - Coad, J.P.

AU - Gruenhagen, S.

AU - Hole, D.E.

AU - Hakola, Antti

AU - Koivuranta, Seppo

AU - Likonen, Jari

AU - Rubel, M.

AU - Stamp, M.

AU - Widdowson, A.

AU - contributors, JET-EFDA

PY - 2011

Y1 - 2011

N2 - In 2010, all the plasma-facing components were removed from JET so that the carbon-based surfaces could be replaced with beryllium (Be) or tungsten as part of the ITER-like wall (ILW) project. This gives unprecedented opportunities for post-mortem analyses of these plasma-facing surfaces; this paper reviews the data obtained so far and relates the information to studies of tiles removed during previous JET shutdowns. The general pattern of erosion/deposition at the JET divertor has been maintained, with deposition of impurities in the scrape-off layer (SOL) at the inner divertor and preferential removal of carbon and transport into the corner. However, the remaining films in the SOL contain very high Be/C ratios at the surface. The first measurements of erosion using a tile profiler have been completed, with up to 200 microns erosion being recorded at points on the inner wall guard limiters.

AB - In 2010, all the plasma-facing components were removed from JET so that the carbon-based surfaces could be replaced with beryllium (Be) or tungsten as part of the ITER-like wall (ILW) project. This gives unprecedented opportunities for post-mortem analyses of these plasma-facing surfaces; this paper reviews the data obtained so far and relates the information to studies of tiles removed during previous JET shutdowns. The general pattern of erosion/deposition at the JET divertor has been maintained, with deposition of impurities in the scrape-off layer (SOL) at the inner divertor and preferential removal of carbon and transport into the corner. However, the remaining films in the SOL contain very high Be/C ratios at the surface. The first measurements of erosion using a tile profiler have been completed, with up to 200 microns erosion being recorded at points on the inner wall guard limiters.

U2 - 10.1088/0031-8949/2011/T145/014003

DO - 10.1088/0031-8949/2011/T145/014003

M3 - Article in a proceedings journal

VL - 2011

JO - Physica Scripta

JF - Physica Scripta

SN - 0031-8949

IS - T145

ER -