Structural investigation of re-deposited layers in JET

Jari Likonen; E. Vainonen-Ahlgren; L. Khriachtchev; J. P. Coad; M. Rubel; T. Renvall; K. Arstila; D. E. Hole; JET-EFDA contributors

doi:10.1016/j.jnucmat.2008.04.005

Structural investigation of re-deposited layers in JET

Jari Likonen (Corresponding Author), E. Vainonen-Ahlgren, L. Khriachtchev, J. P. Coad, M. Rubel, T. Renvall, K. Arstila, D. E. Hole, JET-EFDA contributors

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

9 Citations (Scopus)

Abstract

JET Mk-II Gas Box divertor tiles exposed in 1998–2001 have been analysed with various ion beam techniques, secondary ion mass spectrometry (SIMS) and Raman spectroscopy. Inner divertor wall tiles removed in 2001 were covered with a duplex film. The inner layer was very rich in metallic impurities, with Be/C ∼ 1 and H-isotopes only present at low concentrations. The outer layer contained higher concentrations of D than normal for plasma-facing surfaces in JET (D/C ∼ 0.4), and Be/C ∼ 0.14. Raman and SIMS analyses show that the deposited films on inner divertor tiles are hydrogenated amorphous carbon with low sp³ fractions. The deposits have polymeric structure and low density. Both Raman scattering and SIMS indicate that films on inner divertor wall Tiles 1 and 3, and on floor Tile 4 have some differences in the chemical structure of the deposited films

Original language	English
Pages (from-to)	486-491
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	377
Issue number	3
DOIs	https://doi.org/10.1016/j.jnucmat.2008.04.005
Publication status	Published - 2008
MoE publication type	A1 Journal article-refereed

Keywords

JET
JET divertor
divertor
divertor tiles
plasma
plasma-wall interactions

UN SDGs

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

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10.1016/j.jnucmat.2008.04.005

Cite this

@article{dc8d9cde9e584385acf2be57b0acd512,

title = "Structural investigation of re-deposited layers in JET",

abstract = "JET Mk-II Gas Box divertor tiles exposed in 1998–2001 have been analysed with various ion beam techniques, secondary ion mass spectrometry (SIMS) and Raman spectroscopy. Inner divertor wall tiles removed in 2001 were covered with a duplex film. The inner layer was very rich in metallic impurities, with Be/C ∼ 1 and H-isotopes only present at low concentrations. The outer layer contained higher concentrations of D than normal for plasma-facing surfaces in JET (D/C ∼ 0.4), and Be/C ∼ 0.14. Raman and SIMS analyses show that the deposited films on inner divertor tiles are hydrogenated amorphous carbon with low sp3 fractions. The deposits have polymeric structure and low density. Both Raman scattering and SIMS indicate that films on inner divertor wall Tiles 1 and 3, and on floor Tile 4 have some differences in the chemical structure of the deposited films",

keywords = "JET, JET divertor, divertor, divertor tiles, plasma, plasma-wall interactions",

author = "Jari Likonen and E. Vainonen-Ahlgren and L. Khriachtchev and Coad, {J. P.} and M. Rubel and T. Renvall and K. Arstila and Hole, {D. E.} and {JET-EFDA contributors}",

year = "2008",

doi = "10.1016/j.jnucmat.2008.04.005",

language = "English",

volume = "377",

pages = "486--491",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier B.V.",

number = "3",

}

TY - JOUR

T1 - Structural investigation of re-deposited layers in JET

AU - Likonen, Jari

AU - Vainonen-Ahlgren, E.

AU - Khriachtchev, L.

AU - Coad, J. P.

AU - Rubel, M.

AU - Renvall, T.

AU - Arstila, K.

AU - Hole, D. E.

AU - JET-EFDA contributors

PY - 2008

Y1 - 2008

N2 - JET Mk-II Gas Box divertor tiles exposed in 1998–2001 have been analysed with various ion beam techniques, secondary ion mass spectrometry (SIMS) and Raman spectroscopy. Inner divertor wall tiles removed in 2001 were covered with a duplex film. The inner layer was very rich in metallic impurities, with Be/C ∼ 1 and H-isotopes only present at low concentrations. The outer layer contained higher concentrations of D than normal for plasma-facing surfaces in JET (D/C ∼ 0.4), and Be/C ∼ 0.14. Raman and SIMS analyses show that the deposited films on inner divertor tiles are hydrogenated amorphous carbon with low sp3 fractions. The deposits have polymeric structure and low density. Both Raman scattering and SIMS indicate that films on inner divertor wall Tiles 1 and 3, and on floor Tile 4 have some differences in the chemical structure of the deposited films

AB - JET Mk-II Gas Box divertor tiles exposed in 1998–2001 have been analysed with various ion beam techniques, secondary ion mass spectrometry (SIMS) and Raman spectroscopy. Inner divertor wall tiles removed in 2001 were covered with a duplex film. The inner layer was very rich in metallic impurities, with Be/C ∼ 1 and H-isotopes only present at low concentrations. The outer layer contained higher concentrations of D than normal for plasma-facing surfaces in JET (D/C ∼ 0.4), and Be/C ∼ 0.14. Raman and SIMS analyses show that the deposited films on inner divertor tiles are hydrogenated amorphous carbon with low sp3 fractions. The deposits have polymeric structure and low density. Both Raman scattering and SIMS indicate that films on inner divertor wall Tiles 1 and 3, and on floor Tile 4 have some differences in the chemical structure of the deposited films

KW - JET

KW - JET divertor

KW - divertor

KW - divertor tiles

KW - plasma

KW - plasma-wall interactions

U2 - 10.1016/j.jnucmat.2008.04.005

DO - 10.1016/j.jnucmat.2008.04.005

M3 - Article

SN - 0022-3115

VL - 377

SP - 486

EP - 491

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 3

ER -

Structural investigation of re-deposited layers in JET

Abstract

Keywords

UN SDGs

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