Effect of material properties on the laser-induced desorption of hydrogen from tungsten

Kulagin, Vladimir; Gasparyan, Yury

doi:10.1016/j.jnucmat.2023.154747

Cited by 4 publications

(1 citation statement)

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“…An example of such a code is TMAP7 [41] widely used for simulations of the tritium thermal desorption from the plasma-facing components during LID [5,[42][43][44]. Recently, the commercial packages, such as COMSOL Multiphysics also started to attract more attention for LID modeling [45,46].…”

Section: Introductionmentioning

confidence: 99%

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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