LIBS detection of erosion/deposition and deuterium retention resulting from exposure to Pilot-PSI plasmas

Piip, K.; Meiden, H.J. van der; Hämarik, Lauri; Karhunen, J.; Hakola, A.; Laan, M.; Paris, P.; Aints, M.; Likonen, J.; Bystrov, K.; Kozlova, J.; Založnik, A.; Kelemen, Mitja; Markelj, S.

doi:10.1016/j.jnucmat.2017.03.044

Cited by 20 publications

(11 citation statements)

References 21 publications

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“…The width of lighter annular rings was ≈ 5 mm. Similar darker and lighter regions were observed also in previous studies[26,27,45] and their appearance is consistent with the non-uniform distribution of plasma conditions along the coating surface. The surface temperature, plasma temperature and plasma density of Magnum-PSI have Gaussian distribution[26,46].…”

supporting

confidence: 91%

“…Laser induced breakdown spectroscopy (LIBS) has been shown to be a promising method for the in-situ fuel retention monitoring in tokamaks [20][21][22][23][24][25] and linear plasma devices [26][27][28][29]. However, the line intensities in LIBS spectra depend not only on the coating composition but also on morphology and crystalline phase content [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

“…Besides the spectral lines intensities, the determination of the deuterium retention in the plasma-facing components requires the knowledge of ablation rates of the investigated materials which also depends on the coating properties [32,33]. These coating properties may be further changed by the exposure of coatings to high plasma fluxes [26,34,35]. This necessitates extensive studies of the influence of coating properties and the parameters of deuterium loading on the LIBS spectra.…”

Section: Introductionmentioning

confidence: 99%

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LIBS study of ITER relevant tungsten–oxygen coatings exposed to deuterium plasma in Magnum-PSI

Jõgi

Paris

Laan

et al. 2021

Journal of Nuclear Materials

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supporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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LIBS study of ITER relevant tungsten–oxygen coatings exposed to deuterium plasma in Magnum-PSI

Jõgi

Paris

Laan

et al. 2021

Journal of Nuclear Materials

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“…Under laser irradiation, the PFCs' wall undergoes a solid → plasma transition giving rise to the emission of lines whose spectroscopic analysis leads to the multi-elemental composition of the sample provided certain assumptions. Even if most of the LIBS measurements are performed using nanosecond laser pulses with a certain degree of success [3][4][5], we have chosen to investigate the potentialities of picosecond laser pulses already tested in JET [6]. Previous works have shown that LIBS using ns pulses is not necessarily the most appropriate to the measurement of the concentration of light atoms in heavy matrices.…”

Section: Introductionmentioning

confidence: 99%

Towards ps-LIBS tritium measurements in W/Al materials

Bultel

Morel

Favre

et al. 2019

Fusion Engineering and Design

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This communication deals with experimental results crucial for the sizing of picosecond LIBS measurements dedicated to the determination of tritium density profiles in the plasma facing components. Ablation properties in single pulse on aluminum (considered as a surrogate of beryllium) and tungsten have been obtained for 532 and 1064 nm picosecond laser pulses. Then, double pulse experiments have been performed to estimate the role played by the second pulse on the spectral radiance observed for lines representative of the ionization degree of the plasma and possible observation of low radiance lines.

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“…The investigation of deposition distributed on the surface of plasma‐facing materials of EAST was carried out using LIBS . LIBS technique has been used to investigate the depth profiles of layered structure and fuel retention in PFCs . LIBS methods have a high potential for remote in‐situ monitoring of plasma facing materials and for depth profiling of multi layered coating structure …”

Section: Introductionmentioning

confidence: 99%

Depth profiling of tungsten coating layer on CuCrZr alloy using LIBS approach

Imran

Sun

Liu

et al. 2018

Surface & Interface Analysis

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Laser induced breakdown spectroscopy (LIBS) was employed to find the depth profile of W-coated CuCrZr alloy. Cathodic arc deposition method was applied to produce tungsten coating on the CuCrZr alloy. The LIBS measurements were carried out by using a Nd:YAG laser at its fundamental wavelength (1064 nm) with various fluences.The spectral intensity emitted from laser induced plasma of the coating material was investigated for both elemental and depth-profile analyses in terms of linear correlation coefficient. Other surface characterization techniques (scanning electron microscopy and energy dispersive X-ray) were also used to determine morphology and elemental composition. It is observed that nonuniform radial energy distribution of Gaussian laser beam caused gradual decay of spectral lines of the coating and rise of substrate lines. The results indicate that the spectral intensity from W coating was higher than that from the bulk material at same laser fluence. The high-resolution in-depth profile was achieved at low fluence. This study demonstrates that LIBS is a promising technique for the depth-profiling analysis of W coating of EAST-like material and can be used to determine the material erosion and impurity deposition on plasma facing components. KEYWORDS cathodic arc deposition, CuCrZr alloy, depth profile, LIBS, W-coating 1 | INTRODUCTION Metallic coatings for various applications, like plasma facing material, wear and corrosion resistance, and protection against erosion, have great importance and are in a high demand both in technology and industry. 1 Many types of coating are used to improve mechanical, optical, thermal, electrical, chemical, and magnetic properties of the substrate. Many applications in industry require in-depth characterization of coated layers with thickness from nanometre to tens of micrometre. 2 The plasma facing components (PFCs) used in fusion devices have to operate under highly aggressive environment. The coatings deposition produced on PFCs have to protect them from high heat flux plasm particles in order to improve their performance in long pulse operations. However, some materials are eroded as high heat flux strike with wall components and redeposited as an impurity on PFCs which changed the surface composition. 3-5 Moreover, the exposure of PFCs to high-energy particles fluxes changes the surface crystallinity and causes the change in ablation threshold value. In EAST tokamak, the ITER-like W mono-blocks were used in upper divertor target. The divertor baffle and dome were made of W/CuCrZr (W plates on CuCrZr alloy). 6,7 A reliable technique is required to measure the depth profile of erosion and impurity deposition on surface modification which could perform in the tokamak-like environment for in-situ analysis and give the entire information of elemental composition.Laser induced breakdown spectroscopy (LIBS) is a promising multi-element analytical technique for in-situ analysis of the chemical composition of components inside the vacuum vessel of fusion devices. [8][9][10...

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LIBS detection of erosion/deposition and deuterium retention resulting from exposure to Pilot-PSI plasmas

Cited by 20 publications

References 21 publications

LIBS study of ITER relevant tungsten–oxygen coatings exposed to deuterium plasma in Magnum-PSI

LIBS study of ITER relevant tungsten–oxygen coatings exposed to deuterium plasma in Magnum-PSI

Towards ps-LIBS tritium measurements in W/Al materials

Depth profiling of tungsten coating layer on CuCrZr alloy using LIBS approach

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