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, EFDA-JET work-programme

Research output: Contribution to journalArticleScientificpeer-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 languageEnglish
Pages (from-to)486-491
Number of pages6
JournalJournal of Nuclear Materials
Volume377
Issue number3
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

Fingerprint

tiles
Tile
Secondary ion mass spectrometry
secondary ion mass spectrometry
Facings
Amorphous carbon
Isotopes
Ion beams
boxes
Raman spectroscopy
Raman scattering
low concentrations
Deposits
isotopes
Gases
ion beams
deposits
Impurities
Raman spectra
Plasmas

Keywords

  • JET
  • JET divertor
  • divertor
  • divertor tiles
  • plasma
  • plasma-wall interactions

Cite this

Likonen, J., Vainonen-Ahlgren, E., Khriachtchev, L., Coad, J. P., Rubel, M., Renvall, T., ... work-programme, EFDA-JET. (2008). Structural investigation of re-deposited layers in JET. Journal of Nuclear Materials, 377(3), 486-491. https://doi.org/10.1016/j.jnucmat.2008.04.005
Likonen, Jari ; Vainonen-Ahlgren, E. ; Khriachtchev, L. ; Coad, J. P. ; Rubel, M. ; Renvall, T. ; Arstila, K. ; Hole, D. E. ; work-programme, EFDA-JET. / Structural investigation of re-deposited layers in JET. In: Journal of Nuclear Materials. 2008 ; Vol. 377, No. 3. pp. 486-491.
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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",
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Likonen, J, Vainonen-Ahlgren, E, Khriachtchev, L, Coad, JP, Rubel, M, Renvall, T, Arstila, K, Hole, DE & work-programme, EFDA-JET 2008, 'Structural investigation of re-deposited layers in JET', Journal of Nuclear Materials, vol. 377, no. 3, pp. 486-491. https://doi.org/10.1016/j.jnucmat.2008.04.005

Structural investigation of re-deposited layers in JET. / Likonen, Jari (Corresponding Author); Vainonen-Ahlgren, E.; Khriachtchev, L.; Coad, J. P.; Rubel, M.; Renvall, T.; Arstila, K.; Hole, D. E.; work-programme, EFDA-JET.

In: Journal of Nuclear Materials, Vol. 377, No. 3, 2008, p. 486-491.

Research output: Contribution to journalArticleScientificpeer-review

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 - work-programme, EFDA-JET

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

VL - 377

SP - 486

EP - 491

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

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ER -

Likonen J, Vainonen-Ahlgren E, Khriachtchev L, Coad JP, Rubel M, Renvall T et al. Structural investigation of re-deposited layers in JET. Journal of Nuclear Materials. 2008;377(3):486-491. https://doi.org/10.1016/j.jnucmat.2008.04.005