Erosion and re-deposition processes in JET tiles studied with ion beams

L. C. Alves; E. Alves; N. P. Barradas; R. Mateus; P. Carvalho; J. P. Coad; A. M. Widdowson; Jari Likonen; Seppo Koivuranta

doi:10.1016/j.nimb.2010.02.115

Erosion and re-deposition processes in JET tiles studied with ion beams

L. C. Alves (Corresponding Author), E. Alves, N. P. Barradas, R. Mateus, P. Carvalho, J. P. Coad, A. M. Widdowson, Jari Likonen, Seppo Koivuranta

Research output: Contribution to journal › Article › Scientific › peer-review

17 Citations (Scopus)

Abstract

Plasma facing components in fusion reactor chambers will operate under extreme conditions. Among the processes with implications on the material lifetime are erosion and re-deposition due to plasma interactions. This work will address the behaviour of both JET divertor and outer poloidal limiters (OPL) under plasma irradiation. The limiters comprise about 50 pairs of tiles in a poloidal stack, each of which has a plasma facing surface about 25 mm (poloidal) by 350 mm (toroidal) and is about 50 mm thick. The divertor tiles are located at the bottom of the chamber and withstand high fluxes of radiation and heat. Standard carbon-fibre composite (CFC) tiles coated with a thin layer of W overlaid with a 10 μm layer of C were studied with RBS/PIXE to understand the erosion/re-deposition processes occurring in these regions of the reactor chamber. High resolution surface morphology was assessed through SEM with and without tilting of the sample. The retention of hydrogen isotopes in the tiles were studied combining NRA and ERDA techniques – this is mostly ²H from the fuelling gas, but ³H is also present as a result of ²H–²H fusion reactions, and ¹H coming from the atmospheric exposure.

Original language	English
Pages (from-to)	1991-1996
Journal	Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
Volume	268
Issue number	11-12
DOIs	https://doi.org/10.1016/j.nimb.2010.02.115
Publication status	Published - 2010
MoE publication type	A1 Journal article-refereed
Event	19th International Conference on Ion Beam Analysis, IBA 2009 - Cambridge, United Kingdom Duration: 7 Sept 2009 → 11 Sept 2009

Keywords

Carbon-fibre composites tiles
Fusion reactor materials
Ion beam analysis

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.nimb.2010.02.115

Cite this

Alves, L. C., Alves, E., Barradas, N. P., Mateus, R., Carvalho, P., Coad, J. P., Widdowson, A. M., Likonen, J., & Koivuranta, S. (2010). Erosion and re-deposition processes in JET tiles studied with ion beams. Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 268(11-12), 1991-1996. https://doi.org/10.1016/j.nimb.2010.02.115

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title = "Erosion and re-deposition processes in JET tiles studied with ion beams",

abstract = "Plasma facing components in fusion reactor chambers will operate under extreme conditions. Among the processes with implications on the material lifetime are erosion and re-deposition due to plasma interactions. This work will address the behaviour of both JET divertor and outer poloidal limiters (OPL) under plasma irradiation. The limiters comprise about 50 pairs of tiles in a poloidal stack, each of which has a plasma facing surface about 25 mm (poloidal) by 350 mm (toroidal) and is about 50 mm thick. The divertor tiles are located at the bottom of the chamber and withstand high fluxes of radiation and heat. Standard carbon-fibre composite (CFC) tiles coated with a thin layer of W overlaid with a 10 μm layer of C were studied with RBS/PIXE to understand the erosion/re-deposition processes occurring in these regions of the reactor chamber. High resolution surface morphology was assessed through SEM with and without tilting of the sample. The retention of hydrogen isotopes in the tiles were studied combining NRA and ERDA techniques – this is mostly 2H from the fuelling gas, but 3H is also present as a result of 2H–2H fusion reactions, and 1H coming from the atmospheric exposure.",

keywords = "Carbon-fibre composites tiles, Fusion reactor materials, Ion beam analysis",

author = "Alves, {L. C.} and E. Alves and Barradas, {N. P.} and R. Mateus and P. Carvalho and Coad, {J. P.} and Widdowson, {A. M.} and Jari Likonen and Seppo Koivuranta",

year = "2010",

doi = "10.1016/j.nimb.2010.02.115",

language = "English",

volume = "268",

pages = "1991--1996",

journal = "Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms",

issn = "0168-583X",

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note = "19th International Conference on Ion Beam Analysis, IBA 2009 ; Conference date: 07-09-2009 Through 11-09-2009",

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Alves, LC, Alves, E, Barradas, NP, Mateus, R, Carvalho, P, Coad, JP, Widdowson, AM, Likonen, J & Koivuranta, S 2010, 'Erosion and re-deposition processes in JET tiles studied with ion beams', Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, vol. 268, no. 11-12, pp. 1991-1996. https://doi.org/10.1016/j.nimb.2010.02.115

Erosion and re-deposition processes in JET tiles studied with ion beams. / Alves, L. C. (Corresponding Author); Alves, E.; Barradas, N. P. et al.
In: Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, Vol. 268, No. 11-12, 2010, p. 1991-1996.

Research output: Contribution to journal › Article › Scientific › peer-review

TY - JOUR

T1 - Erosion and re-deposition processes in JET tiles studied with ion beams

AU - Alves, L. C.

AU - Alves, E.

AU - Barradas, N. P.

AU - Mateus, R.

AU - Carvalho, P.

AU - Coad, J. P.

AU - Widdowson, A. M.

AU - Likonen, Jari

AU - Koivuranta, Seppo

PY - 2010

Y1 - 2010

N2 - Plasma facing components in fusion reactor chambers will operate under extreme conditions. Among the processes with implications on the material lifetime are erosion and re-deposition due to plasma interactions. This work will address the behaviour of both JET divertor and outer poloidal limiters (OPL) under plasma irradiation. The limiters comprise about 50 pairs of tiles in a poloidal stack, each of which has a plasma facing surface about 25 mm (poloidal) by 350 mm (toroidal) and is about 50 mm thick. The divertor tiles are located at the bottom of the chamber and withstand high fluxes of radiation and heat. Standard carbon-fibre composite (CFC) tiles coated with a thin layer of W overlaid with a 10 μm layer of C were studied with RBS/PIXE to understand the erosion/re-deposition processes occurring in these regions of the reactor chamber. High resolution surface morphology was assessed through SEM with and without tilting of the sample. The retention of hydrogen isotopes in the tiles were studied combining NRA and ERDA techniques – this is mostly 2H from the fuelling gas, but 3H is also present as a result of 2H–2H fusion reactions, and 1H coming from the atmospheric exposure.

AB - Plasma facing components in fusion reactor chambers will operate under extreme conditions. Among the processes with implications on the material lifetime are erosion and re-deposition due to plasma interactions. This work will address the behaviour of both JET divertor and outer poloidal limiters (OPL) under plasma irradiation. The limiters comprise about 50 pairs of tiles in a poloidal stack, each of which has a plasma facing surface about 25 mm (poloidal) by 350 mm (toroidal) and is about 50 mm thick. The divertor tiles are located at the bottom of the chamber and withstand high fluxes of radiation and heat. Standard carbon-fibre composite (CFC) tiles coated with a thin layer of W overlaid with a 10 μm layer of C were studied with RBS/PIXE to understand the erosion/re-deposition processes occurring in these regions of the reactor chamber. High resolution surface morphology was assessed through SEM with and without tilting of the sample. The retention of hydrogen isotopes in the tiles were studied combining NRA and ERDA techniques – this is mostly 2H from the fuelling gas, but 3H is also present as a result of 2H–2H fusion reactions, and 1H coming from the atmospheric exposure.

KW - Carbon-fibre composites tiles

KW - Fusion reactor materials

KW - Ion beam analysis

U2 - 10.1016/j.nimb.2010.02.115

DO - 10.1016/j.nimb.2010.02.115

M3 - Article

SN - 0168-583X

VL - 268

SP - 1991

EP - 1996

JO - Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms

JF - Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms

IS - 11-12

T2 - 19th International Conference on Ion Beam Analysis, IBA 2009

Y2 - 7 September 2009 through 11 September 2009

ER -

Erosion and re-deposition processes in JET tiles studied with ion beams

Abstract

Keywords

UN SDGs

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