Possibility of using machine learning methods to reconstruct solid body parameters during laser-induced desorption analysis

Stepanenko, A A; Kashin, D A; Gasparyan, Yu M

doi:10.1088/1402-4896/ad0186

Cited by 3 publications

(2 citation statements)

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“…To verify our numerical code, we performed a comparative run against the recently reported test TMAP7 data [85]. For the simulation, we used the one-dimensional model of tritium desorption.…”

Section: Appendix D Verification Of the Numerical Codementioning

confidence: 99%

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Dimensional effects in analysis of laser-induced-desorption diagnostics data

Stepanenko,

Gasparyan

2024

Phys. Scr.

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The accurate assessment of the local tritium concentration in the tokamak first wall by means of the laser-induced desorption (LID) diagnostics is sought as one the key solutions to monitoring the local radioactive tritium content in the first wall of the fusion reactor ITER. Numerical models of gas desorption from solids used for LID simulation are usually closed with the one-dimensional transport models. In this study, the temperature and particle dynamics in the target irradiated by a short laser pulse during LID are analyzed by means of the two-dimensional model to assess the validity of using one-dimensional approximation for recovering the diagnostics signal. The quantitative estimates for the parameters governing the heat and particle transfer are presented. The analytical expressions for the sample spatiotemporal temperature profiles driven by the target irradiation with a Gaussian laser beam with the trapezoid temporal shape are derived. The obtained relations are used to simulate tritium desorption from a tungsten sample driven by pulsed heating. It is shown that depending of the ratio between the laser spot radius and the heat diffusion length, the one-dimensional approach can noticeably overestimate the sample temperature in the limit of small laser spot radius (estimated for tungsten as ∼ 0.5 − 1.0 mm), resulting in more than 100% larger amounts of tritium desorbed from the target, compared to the two-dimensional approximation. In the limit of large laser spot radius (≥ 1.5 mm), both approaches yield comparable amounts of tritium desorbed from the sample.

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Section: Appendix D Verification Of the Numerical Codementioning

confidence: 99%

“…To describe the tritium transport, equations (42), (43) were used. In accordance with [85], the particle trapping rate, E kT exp The spatial derivatives were discretized with the fourth-order central scheme. The numerical grid had 400 nodes.…”

Section: Appendix D Verification Of the Numerical Codementioning

confidence: 99%