Deposition of 13C tracer in the JET MkII-HD divertor

Jari Likonen, Antti Hakola, Seppo Koivuranta, Markus Airila, J.P. Coad, A. Widdowson, J. Strachan, M. Rubel, S. Brezinsek, S. Grünhagen, M. Stamp, JET- EFDA contributors

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)

Abstract

Migration of 13C has been investigated at JET by injecting 13C-labelled methane at the outer divertor base at the end of the 2009 campaign. The 13C deposition profiles on carbon fibre composite divertor tiles were measured by secondary ion mass spectrometry and Rutherford backscattering techniques. 13C was mainly deposited near the puffing location on the outer divertor base tiles. High amounts of 13C were also found at the outer vertical target: at the bottom of the lower and at the top of the upper plates. Thirty-three percent of puffed 13CH4 was instantly pumped out by the divertor cryopump, which is close to the pump duct entrance. Global 13C transport in the torus was modelled by the EDGE2D/EIRENE and DIVIMP codes, and local 13C migration in the vicinity of the injection location by the ERO code. The DIVIMP and EDGE2D simulations show strong prompt deposition of 13C directly adjacent to the injection point as well as in the far scrape-off layer (SOL) along both the inner and outer divertor targets. In addition, the measured 13C deposition along the outer divertor wall tiles is qualitatively reproduced. However, EDGE2D and DIVIMP do not predict any deposition along the divertor surfaces facing the private plasma on the inner floor tile and inboard of the outer strike point on tile 5. The ERO calculations also indicate that most of the deposition occurs close to the injection location on the vertical face of the LBSRP tile and the horizontal part of tile 6
Original languageEnglish
Article number014004
Number of pages8
JournalPhysica Scripta
Issue numberT145
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

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tiles
Tile
tracers
Injection
injection
Migration
Vertical
Target
Carbon Fiber
Backscattering
fiber composites
Methane
Mass Spectrometry
carbon fibers
ducts
entrances
secondary ion mass spectrometry
Percent
Pump
backscattering

Cite this

Likonen, Jari ; Hakola, Antti ; Koivuranta, Seppo ; Airila, Markus ; Coad, J.P. ; Widdowson, A. ; Strachan, J. ; Rubel, M. ; Brezinsek, S. ; Grünhagen, S. ; Stamp, M. ; contributors, JET- EFDA. / Deposition of 13C tracer in the JET MkII-HD divertor. In: Physica Scripta. 2011 ; No. T145.
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title = "Deposition of 13C tracer in the JET MkII-HD divertor",
abstract = "Migration of 13C has been investigated at JET by injecting 13C-labelled methane at the outer divertor base at the end of the 2009 campaign. The 13C deposition profiles on carbon fibre composite divertor tiles were measured by secondary ion mass spectrometry and Rutherford backscattering techniques. 13C was mainly deposited near the puffing location on the outer divertor base tiles. High amounts of 13C were also found at the outer vertical target: at the bottom of the lower and at the top of the upper plates. Thirty-three percent of puffed 13CH4 was instantly pumped out by the divertor cryopump, which is close to the pump duct entrance. Global 13C transport in the torus was modelled by the EDGE2D/EIRENE and DIVIMP codes, and local 13C migration in the vicinity of the injection location by the ERO code. The DIVIMP and EDGE2D simulations show strong prompt deposition of 13C directly adjacent to the injection point as well as in the far scrape-off layer (SOL) along both the inner and outer divertor targets. In addition, the measured 13C deposition along the outer divertor wall tiles is qualitatively reproduced. However, EDGE2D and DIVIMP do not predict any deposition along the divertor surfaces facing the private plasma on the inner floor tile and inboard of the outer strike point on tile 5. The ERO calculations also indicate that most of the deposition occurs close to the injection location on the vertical face of the LBSRP tile and the horizontal part of tile 6",
author = "Jari Likonen and Antti Hakola and Seppo Koivuranta and Markus Airila and J.P. Coad and A. Widdowson and J. Strachan and M. Rubel and S. Brezinsek and S. Gr{\"u}nhagen and M. Stamp and contributors, {JET- EFDA}",
year = "2011",
doi = "10.1088/0031-8949/2011/T145/014004",
language = "English",
journal = "Physica Scripta",
issn = "0031-8949",
publisher = "Institute of Physics IOP",
number = "T145",

}

Likonen, J, Hakola, A, Koivuranta, S, Airila, M, Coad, JP, Widdowson, A, Strachan, J, Rubel, M, Brezinsek, S, Grünhagen, S, Stamp, M & contributors, JETEFDA 2011, 'Deposition of 13C tracer in the JET MkII-HD divertor', Physica Scripta, no. T145, 014004. https://doi.org/10.1088/0031-8949/2011/T145/014004

Deposition of 13C tracer in the JET MkII-HD divertor. / Likonen, Jari; Hakola, Antti; Koivuranta, Seppo; Airila, Markus; Coad, J.P.; Widdowson, A.; Strachan, J.; Rubel, M.; Brezinsek, S.; Grünhagen, S.; Stamp, M.; contributors, JET- EFDA.

In: Physica Scripta, No. T145, 014004, 2011.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Deposition of 13C tracer in the JET MkII-HD divertor

AU - Likonen, Jari

AU - Hakola, Antti

AU - Koivuranta, Seppo

AU - Airila, Markus

AU - Coad, J.P.

AU - Widdowson, A.

AU - Strachan, J.

AU - Rubel, M.

AU - Brezinsek, S.

AU - Grünhagen, S.

AU - Stamp, M.

AU - contributors, JET- EFDA

PY - 2011

Y1 - 2011

N2 - Migration of 13C has been investigated at JET by injecting 13C-labelled methane at the outer divertor base at the end of the 2009 campaign. The 13C deposition profiles on carbon fibre composite divertor tiles were measured by secondary ion mass spectrometry and Rutherford backscattering techniques. 13C was mainly deposited near the puffing location on the outer divertor base tiles. High amounts of 13C were also found at the outer vertical target: at the bottom of the lower and at the top of the upper plates. Thirty-three percent of puffed 13CH4 was instantly pumped out by the divertor cryopump, which is close to the pump duct entrance. Global 13C transport in the torus was modelled by the EDGE2D/EIRENE and DIVIMP codes, and local 13C migration in the vicinity of the injection location by the ERO code. The DIVIMP and EDGE2D simulations show strong prompt deposition of 13C directly adjacent to the injection point as well as in the far scrape-off layer (SOL) along both the inner and outer divertor targets. In addition, the measured 13C deposition along the outer divertor wall tiles is qualitatively reproduced. However, EDGE2D and DIVIMP do not predict any deposition along the divertor surfaces facing the private plasma on the inner floor tile and inboard of the outer strike point on tile 5. The ERO calculations also indicate that most of the deposition occurs close to the injection location on the vertical face of the LBSRP tile and the horizontal part of tile 6

AB - Migration of 13C has been investigated at JET by injecting 13C-labelled methane at the outer divertor base at the end of the 2009 campaign. The 13C deposition profiles on carbon fibre composite divertor tiles were measured by secondary ion mass spectrometry and Rutherford backscattering techniques. 13C was mainly deposited near the puffing location on the outer divertor base tiles. High amounts of 13C were also found at the outer vertical target: at the bottom of the lower and at the top of the upper plates. Thirty-three percent of puffed 13CH4 was instantly pumped out by the divertor cryopump, which is close to the pump duct entrance. Global 13C transport in the torus was modelled by the EDGE2D/EIRENE and DIVIMP codes, and local 13C migration in the vicinity of the injection location by the ERO code. The DIVIMP and EDGE2D simulations show strong prompt deposition of 13C directly adjacent to the injection point as well as in the far scrape-off layer (SOL) along both the inner and outer divertor targets. In addition, the measured 13C deposition along the outer divertor wall tiles is qualitatively reproduced. However, EDGE2D and DIVIMP do not predict any deposition along the divertor surfaces facing the private plasma on the inner floor tile and inboard of the outer strike point on tile 5. The ERO calculations also indicate that most of the deposition occurs close to the injection location on the vertical face of the LBSRP tile and the horizontal part of tile 6

U2 - 10.1088/0031-8949/2011/T145/014004

DO - 10.1088/0031-8949/2011/T145/014004

M3 - Article

JO - Physica Scripta

JF - Physica Scripta

SN - 0031-8949

IS - T145

M1 - 014004

ER -