Laser ablation of thin tungsten layers deposited on carbon substrate

P. Paris (Corresponding Author), M. Aints, M. Laan, M. Kiisk, Jari Likonen, J. Kolehmainen, S. Tervakangas

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

Abstract

The aim of the present study was to develop in situ control methods for erosion of layers and deposition on the main wall of a fusion reactor. For this purposes laser induced breakdown spectroscopy (LIBS) was applied to specially manufactured samples with coatings of known thickness and composition in vacuum. The whole laser induced spectrum in range 200–850 nm was recorded for every laser shot. Our results demonstrated that the equipment used has sufficient sensitivity for recording of the spectrum during a single laser shot. The diagnostic lines most suitable for characterization of layers were determined. Tungsten layer on carbon substrate is detectable and its ablation rate is 0.5–1 μm per laser pulse. From the recorded spectra it is possible to estimate tungsten coating thickness, but for a complex coating where tungsten layer was covered with diamond-like carbon (DLC), tungsten was spectroscopically not detectable. Additional information about charge concentration and movement is possible to obtain by measuring the current pulses in the sample circuit.
Original languageEnglish
Pages (from-to)1465-1467
Number of pages3
JournalFusion Engineering and Design
Volume84
Issue number7-11
DOIs
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed
Event25th Symposium on Fusion Technology, SOFT-25 - Rostock, Germany
Duration: 15 Sep 200819 Sep 2008

Fingerprint

Laser ablation
Tungsten
Carbon
Substrates
Coatings
Lasers
Laser induced breakdown spectroscopy
Fusion reactors
Ablation
Erosion
Laser pulses
Diamonds
Vacuum
Networks (circuits)
Chemical analysis

Keywords

  • LIBS
  • Laser ablation
  • Plasma facing materials
  • Diagnostics
  • Tungsten coating
  • Erosion and deposition

Cite this

Paris, P., Aints, M., Laan, M., Kiisk, M., Likonen, J., Kolehmainen, J., & Tervakangas, S. (2009). Laser ablation of thin tungsten layers deposited on carbon substrate. Fusion Engineering and Design, 84(7-11), 1465-1467. https://doi.org/10.1016/j.fusengdes.2009.01.033
Paris, P. ; Aints, M. ; Laan, M. ; Kiisk, M. ; Likonen, Jari ; Kolehmainen, J. ; Tervakangas, S. / Laser ablation of thin tungsten layers deposited on carbon substrate. In: Fusion Engineering and Design. 2009 ; Vol. 84, No. 7-11. pp. 1465-1467.
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Paris, P, Aints, M, Laan, M, Kiisk, M, Likonen, J, Kolehmainen, J & Tervakangas, S 2009, 'Laser ablation of thin tungsten layers deposited on carbon substrate', Fusion Engineering and Design, vol. 84, no. 7-11, pp. 1465-1467. https://doi.org/10.1016/j.fusengdes.2009.01.033

Laser ablation of thin tungsten layers deposited on carbon substrate. / Paris, P. (Corresponding Author); Aints, M.; Laan, M.; Kiisk, M.; Likonen, Jari; Kolehmainen, J.; Tervakangas, S.

In: Fusion Engineering and Design, Vol. 84, No. 7-11, 2009, p. 1465-1467.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Laser ablation of thin tungsten layers deposited on carbon substrate

AU - Paris, P.

AU - Aints, M.

AU - Laan, M.

AU - Kiisk, M.

AU - Likonen, Jari

AU - Kolehmainen, J.

AU - Tervakangas, S.

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AB - The aim of the present study was to develop in situ control methods for erosion of layers and deposition on the main wall of a fusion reactor. For this purposes laser induced breakdown spectroscopy (LIBS) was applied to specially manufactured samples with coatings of known thickness and composition in vacuum. The whole laser induced spectrum in range 200–850 nm was recorded for every laser shot. Our results demonstrated that the equipment used has sufficient sensitivity for recording of the spectrum during a single laser shot. The diagnostic lines most suitable for characterization of layers were determined. Tungsten layer on carbon substrate is detectable and its ablation rate is 0.5–1 μm per laser pulse. From the recorded spectra it is possible to estimate tungsten coating thickness, but for a complex coating where tungsten layer was covered with diamond-like carbon (DLC), tungsten was spectroscopically not detectable. Additional information about charge concentration and movement is possible to obtain by measuring the current pulses in the sample circuit.

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KW - Plasma facing materials

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KW - Tungsten coating

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