Time resolved imaging of laser induced ablation spectroscopy (LIAS) in TEXTOR and comparison with modeling

Gierse, N.; Tokar, M. Z.; Brezinsek, S.; Giesen, Thomas; Hubeny, Michael; Huber, A.; Philipps, V.; Pospieszczyk, A.; Sergienko, G.; Wegner, Julian; Xiao, Qingbo; Samm, U.; Linsmeier, Ch.

doi:10.1088/0031-8949/t167/1/014034

Cited by 14 publications

(5 citation statements)

References 23 publications

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“…A combined laser-induced breakdown / ablation spectroscopy (LIBS/LIAS) is currently under feasibility design for in situ and real-time diagnostic of the co-deposition and fuel retention during and in between plasma discharges on W7-X. Based on the similar system developed on the TEXTOR tokamak [21] and the PSI-2 linear device [22], this system will be further optimised and to be available for OP2 on W7-X. A new fast divertor manipulator, using the similar technology of the mid-plane multi-purpose manipulator, is currently under consideration for both, measurement of divertor downstream profiles and exposure of material samples at the position few mm above the divertor plate.…”

Section: Summary and Future Planmentioning

confidence: 99%

Diagnostic set-up and modelling for investigation of synergy between 3D edge physics and plasma-wall interactions on Wendelstein 7-X

et al. 2017

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A group of edge diagnostics and modelling has been developed for investigation of synergy between 3D edge physics and plasma-wall interactions on Wendelstein 7-X (W7-X). Two endoscopes have been designed for visible and ultraviolet spectroscopy and tomography of the plasma edge, along with infrared thermography of the divertor tiles. Two-dimensional profiles of impurities (e.g. helium, carbon) will be measured by two endoscopes viewing the island divertor region in the plasma edge with a spatial resolution of < 2 mm. A multipurpose manipulator, which is used as the carrier either of the probe head for measuring the plasma edge profiles or of samples for plasma exposure studies, was installed at the outside midplane on W7-X in 2015. A poloidal correlation reflectometer has also been installed at W7-X. The system consists of an antenna array observing the propagation of turbulent phenomena in the mid-plane. The EMC3-EIRENE code package has been adapted for plasma edge transport in helium plasma at W7-X using a hybrid fluid-kinetic approach by enabling EMC3 to treat non-hydrogen isotopes and extending the usage of EIRENE features within EMC3-EIRENE.

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Section: Summary and Future Planmentioning

confidence: 99%

Diagnostic set-up and modelling for investigation of synergy between 3D edge physics and plasma-wall interactions on Wendelstein 7-X

et al. 2017

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“…Specially prepared targets were inserted into TEXTOR and irradiated by a Nd:YAG laser with a pulse duration of 7 ns [2]. Photons of certain energies emitted from the impurity cloud were recorded by a camera looking in the y direction and equipped with a wavelength selective filter [17]. The density of the number of photons with different wavelengths λ emitted from a unit area in the plane ( ) r l , , Φ λ ph were measured.…”

Section: Calculations For Lias Experiments In Textormentioning

confidence: 99%

“…By calculating the total number of . As discussed in reference [17], with these characteristics known and λ N ph measured experimentally, one could assess the number of target particles released by the laser pulse:…”

Section: Calculations For Lias Experiments In Textormentioning

confidence: 99%

Modeling of plasma distortions by laser-induced ablation spectroscopy (LIAS) and implications for the interpretation of LIAS measurements

et al. 2015

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For the interpretation of the line radiation observed from laser induced ablation spectroscopy (LIAS) such parameters as the density and temperature of electrons within very compact clouds of atoms and singly charged ions of ablated material have to be known. Compared to the local plasma conditions prior to the laser pulse, these can be strongly changed during LIAS since new electrons are generated by the ionisation of particles ejected from the irradiated target. Because of their transience and spatial inhomogeneity it is technically difficult to measure disturbances induced in the plasma by LIAS. To overcome this uncertainty a numerical model has been elaborated, providing a self-consistent description for the spreading of ablated particles and accompanying modifications in the plasma. The results of calculations for LIAS performed on carbon-containing targets in Ohmic and additionally heated discharges in the tokamak TEXTOR are presented. Due to the increase in the electron density the 'ionisation per photon' ratio, S/XB factor, is significantly enhanced compared to unperturbed plasma conditions. The impact of the amount of material ablated and of the plasma conditions before LIAS on the level of the S/XB-enhancement is investigated.

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“…But they are ex situ diagnoses methods that may reduce the reliability of results. Laserbased methods such as Laser Induced Ablation Spectroscopy (LIAS) [7][8][9][10], Laser Induced Desorption Spectroscopy (LIDS) [11][12][13], and Laser-induced breakdown spectroscopy (LIBS) [14][15][16][17] are promising candidates [18]. LIBS is used to measure the composition and content of elements in the sample.…”

Section: Introductionmentioning

confidence: 99%

The effect of ablation angle on intensity of laser-induced breakdown spectroscopy under vacuum

Jia¹,

Wang²,

Gao³

et al. 2021

Phys. Scr.

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The in situ diagnostic of the composition and content of the first wall materials in tokamak devices is an important research interest of the plasma-wall interaction. Laser-induced breakdown spectroscopy (LIBS) has become an attractive tool for in situ diagnostic of the first wall materials. It has the ability to analyze the composition of the first wall remotely and on-line without sample manipulation or pretreatment. In tokamak, using the LIBS method in a fixed window to diagnose wall materials in different positions will inevitably affect the LIBS measurement signal due to different laser ablation and light collection angles. In this paper, we got the determination of the relationship between the intensity of the tungsten spectral line and laser energy in the laboratory as a prerequisite. And the effects of different ablation angles on the temporal evolution of the spectrum of the laser ablated tungsten material were investigated in detail. This provides a reference for in situ LIBS analysis. RECEIVED

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Time resolved imaging of laser induced ablation spectroscopy (LIAS) in TEXTOR and comparison with modeling

Cited by 14 publications

References 23 publications

Diagnostic set-up and modelling for investigation of synergy between 3D edge physics and plasma-wall interactions on Wendelstein 7-X

Diagnostic set-up and modelling for investigation of synergy between 3D edge physics and plasma-wall interactions on Wendelstein 7-X

Modeling of plasma distortions by laser-induced ablation spectroscopy (LIAS) and implications for the interpretation of LIAS measurements

The effect of ablation angle on intensity of laser-induced breakdown spectroscopy under vacuum

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