In-situ tokamak laser applications for detritiation and co-deposited layers studies

Grisolia, Christian; Semerok, A.; Weulersse, Jean-Marc; Guern, F. Le; Фомичев, С. В.; Brygo, François; Fichet, Pascal; Thro, P.-Y.; Coad, P.; Bekris, N.; Stamp, M.; Rosanvallon, S.; Piazza, G.

doi:10.1016/j.jnucmat.2007.01.169

Cited by 70 publications

(24 citation statements)

References 18 publications

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“…This involves the irradiation of the sample by a sufficiently powerful laser, leading to the formation of a plasma, followed by analysis by time-resolved emission spectroscopy. This technique has already been used in the case of tokamaks to probe the edge plasma [1], and developments are currently in progress to verify the carbon balance in fusion machines [2]. LIBS presents an important problem which prevents the technique from being universal: it requires a comparison of the experimental spectra with others performed earlier in controlled conditions with known test sample compositions.…”

Section: Introductionmentioning

confidence: 99%

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The Critical Temperature of Aluminum

2009

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The critical temperature, T c , of metals is a fundamental point when vaporization due to high energy exchanges occurs. Although aluminum is a metal often studied as a benchmark for theories, its critical temperature is not known with a high degree of accuracy. Its determination by experiment is difficult as a result of its high value. This paper reviews the existing data and proposes new ones resulting from recent measurements of particular physical properties and recent theoretical approaches. These new estimates lead to the recommended value of T c = (6700 ± 800) K.

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Section: Introductionmentioning

confidence: 99%

“…Early estimates of the critical temperature T c for aluminum (type of method and group: see Sect 2). …”

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confidence: 99%

The Critical Temperature of Aluminum

2009

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“…It aims at providing non-intrusive and quantitative information on the composition of a surface [16]. Qualitative results have been obtained by the past from preliminary tests on TEXTOR tiles and even using the edge LIDAR on JET [17,18] . Analytical spectral lines (H ␣ , C+, Cr, Be, W) evolution versus laser shots number has been observed from the laser produced plasma.…”

Section: In Situ Techniques For Detritiation and Characterisation/remmentioning

confidence: 99%

Fusion technology activities at JET: Latest results

Barbier¹,

Batistoni²,

Coad³

et al. 2011

Fusion Engineering and Design

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“…The different optical methods used for depth measurement can provide either direct or indirect measurement of the ablation depth. Use of photodiodes (PDs) 8,9 and optical emission spectrum [10][11][12][13][14] are the indirect methods that enable to correlate the signal to the measured depth or change of material layer by observing the presence of a new signal component. Direct measurements can be achieved via high resolution imaging systems that allow visualization of ablation depth in transparent materials.…”

Section: Introductionmentioning

confidence: 99%

Application of self-mixing interferometry for depth monitoring in the ablation of TiN coatings

Demir

Previtali

Magnani

et al. 2015

Journal of Laser Applications

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Among possible monitoring techniques, self-mixing interferometry stands out as an appealing option for online ablation depth measurements. The method uses a simple laser diode, interference is detected inside the diode cavity and measured as the optical power fluctuation by the photodiode encased in the laser diode itself. This way, self-mixing interferometry combines the advantages of a high resolution point displacement measurement technique, with high compactness and easiness of operation. For a proper adaptation of self-mixing interferometry use in laser micromachining to monitor ablation depth, certain optical, electronical, and mechanical limitations need to be overcome. In laser surface texturing of thin ceramic coatings, the ablation depth control is critically important to avoid damage by substrate contamination. In this work, self-mixing interferometry was applied in the laser percussion drilling of TiN coatings. The ∼4 μm thick TiN coatings were drilled with a 1 ns green fiber laser, while the self-mixing monitoring was applied with a 785 nm laser diode. The limitations regarding the presence of process plasma are discussed. The design criteria for the monitoring device are explained. Finally, the self-mixing measurements were compared to a conventional optical measurement device. The concept was validated as the measurements were statistically the same

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In-situ tokamak laser applications for detritiation and co-deposited layers studies

Cited by 70 publications

References 18 publications

The Critical Temperature of Aluminum

The Critical Temperature of Aluminum

Fusion technology activities at JET: Latest results

Application of self-mixing interferometry for depth monitoring in the ablation of TiN coatings

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