Investigation of deuterium trapping and release in the JET ITER-like wall divertor using TDS and TMAP

JET Contributors

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Selected set of samples from JET ITER-Like Wall (JET-ILW) divertor tiles exposed both in 2013–2014 and 2011–2014 has been analysed using Thermal Desorption Spectrometry (TDS). The deuterium (D) amounts obtained with TDS were compared with Ion Beam Analysis (IBA) and Secondary Ion Mass Spectrometry (SIMS) data. The highest amount of D was found on the top part of inner divertor which has regions with the thickest deposited layers. This area resides deep in the scrape-off layer. Changes in plasma configurations between the first (2011–2012) and the second (2013–2014) JET-ILW campaign altered the material migration towards the inner and the outer divertor corner increasing the amount of deposition in the shadowed areas of the divertor base tiles. D retention on the outer divertor tiles is clearly smaller than on the inner divertor tiles. Experimental TDS spectra for samples from the top part of inner divertor and from the outer strike point region were modelled using TMAP program. Experimental deuterium profiles obtained with SIMS have been used and the detrapping and the activation energies have been adjusted. Analysis of the results of the TMAP simulations enabled to determine the nature of traps in different samples.

Original languageEnglish
Pages (from-to)166-178
Number of pages13
JournalNuclear Materials and Energy
Volume19
DOIs
Publication statusE-pub ahead of print - 2 Mar 2019
MoE publication typeNot Eligible

Fingerprint

Thermal desorption
Deuterium
Tile
Spectrometry
deuterium
desorption
trapping
tiles
Secondary ion mass spectrometry
spectroscopy
secondary ion mass spectrometry
Ion beams
Activation energy
Plasmas
4,4',5'-trimethylazapsoralen
ion beams
traps
activation energy
profiles
configurations

Keywords

  • Fuel retention
  • JET
  • TDS

Cite this

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title = "Investigation of deuterium trapping and release in the JET ITER-like wall divertor using TDS and TMAP",
abstract = "Selected set of samples from JET ITER-Like Wall (JET-ILW) divertor tiles exposed both in 2013–2014 and 2011–2014 has been analysed using Thermal Desorption Spectrometry (TDS). The deuterium (D) amounts obtained with TDS were compared with Ion Beam Analysis (IBA) and Secondary Ion Mass Spectrometry (SIMS) data. The highest amount of D was found on the top part of inner divertor which has regions with the thickest deposited layers. This area resides deep in the scrape-off layer. Changes in plasma configurations between the first (2011–2012) and the second (2013–2014) JET-ILW campaign altered the material migration towards the inner and the outer divertor corner increasing the amount of deposition in the shadowed areas of the divertor base tiles. D retention on the outer divertor tiles is clearly smaller than on the inner divertor tiles. Experimental TDS spectra for samples from the top part of inner divertor and from the outer strike point region were modelled using TMAP program. Experimental deuterium profiles obtained with SIMS have been used and the detrapping and the activation energies have been adjusted. Analysis of the results of the TMAP simulations enabled to determine the nature of traps in different samples.",
keywords = "Fuel retention, JET, TDS",
author = "J. Likonen and K. Heinola and {De Backer}, A. and A. Baron-Wiechec and N. Catarino and I. Jepu and Ayres, {C. F.} and P. Coad and S. Koivuranta and S. Krat and Matthews, {G. F.} and M. Mayer and A. Widdowson and {JET Contributors}",
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volume = "19",
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Investigation of deuterium trapping and release in the JET ITER-like wall divertor using TDS and TMAP. / JET Contributors.

In: Nuclear Materials and Energy, Vol. 19, 02.03.2019, p. 166-178.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Investigation of deuterium trapping and release in the JET ITER-like wall divertor using TDS and TMAP

AU - Likonen, J.

AU - Heinola, K.

AU - De Backer, A.

AU - Baron-Wiechec, A.

AU - Catarino, N.

AU - Jepu, I.

AU - Ayres, C. F.

AU - Coad, P.

AU - Koivuranta, S.

AU - Krat, S.

AU - Matthews, G. F.

AU - Mayer, M.

AU - Widdowson, A.

AU - JET Contributors

PY - 2019/3/2

Y1 - 2019/3/2

N2 - Selected set of samples from JET ITER-Like Wall (JET-ILW) divertor tiles exposed both in 2013–2014 and 2011–2014 has been analysed using Thermal Desorption Spectrometry (TDS). The deuterium (D) amounts obtained with TDS were compared with Ion Beam Analysis (IBA) and Secondary Ion Mass Spectrometry (SIMS) data. The highest amount of D was found on the top part of inner divertor which has regions with the thickest deposited layers. This area resides deep in the scrape-off layer. Changes in plasma configurations between the first (2011–2012) and the second (2013–2014) JET-ILW campaign altered the material migration towards the inner and the outer divertor corner increasing the amount of deposition in the shadowed areas of the divertor base tiles. D retention on the outer divertor tiles is clearly smaller than on the inner divertor tiles. Experimental TDS spectra for samples from the top part of inner divertor and from the outer strike point region were modelled using TMAP program. Experimental deuterium profiles obtained with SIMS have been used and the detrapping and the activation energies have been adjusted. Analysis of the results of the TMAP simulations enabled to determine the nature of traps in different samples.

AB - Selected set of samples from JET ITER-Like Wall (JET-ILW) divertor tiles exposed both in 2013–2014 and 2011–2014 has been analysed using Thermal Desorption Spectrometry (TDS). The deuterium (D) amounts obtained with TDS were compared with Ion Beam Analysis (IBA) and Secondary Ion Mass Spectrometry (SIMS) data. The highest amount of D was found on the top part of inner divertor which has regions with the thickest deposited layers. This area resides deep in the scrape-off layer. Changes in plasma configurations between the first (2011–2012) and the second (2013–2014) JET-ILW campaign altered the material migration towards the inner and the outer divertor corner increasing the amount of deposition in the shadowed areas of the divertor base tiles. D retention on the outer divertor tiles is clearly smaller than on the inner divertor tiles. Experimental TDS spectra for samples from the top part of inner divertor and from the outer strike point region were modelled using TMAP program. Experimental deuterium profiles obtained with SIMS have been used and the detrapping and the activation energies have been adjusted. Analysis of the results of the TMAP simulations enabled to determine the nature of traps in different samples.

KW - Fuel retention

KW - JET

KW - TDS

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SN - 2352-1791

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