An analytic parametric study of rounded laser pulse heating

Türkyılmazoğlu, Mustafa

doi:10.1016/j.ijleo.2021.167001

Cited by 6 publications

(3 citation statements)

References 34 publications

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“…The heat transfer in solids in two-and three-dimensional approximations were considered both analytically [54,[58][59][60][61][62][63][64] and numerically [28,35,36,[65][66][67][68][69][70][71] in connection to technological laser applications in a large number of studies. Bechtel [58] considered three-dimensional laser heating of solid samples by a pulse with Gaussian or rectangular spatiotemporal profiles.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

“…Sample heating by ultrashort (primarily, nanosecond) laser pulses with Gaussian spatiotemporal profiles was analyzed in [62,72]. Target heating with ring-shaped laser pulses having rectangular temporal profiles was analyzed in [63]. The generalized Bessel series representation were obtained for the sample temperature profile.…”

Section: Introductionmentioning

confidence: 99%

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

Stepanenko,

Gasparyan

2024

Phys. Scr.

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“…The research results provide a theoretical foundation and guidance for the heat conduction mechanism of repeated long-pulse lasers. Turkyilmazoglu [12] proposed a Fourier theoretical model of a laser pulse heating process for two-dimensional cylindrical materials. The surface temperature increases and attenuation inside the material is detected by irradiating the pulsed laser.…”

Section: Introductionmentioning

confidence: 99%

Non-Fourier Heat Conduction of Nano-Films under Ultra-Fast Laser

Mao

Liu

et al. 2023

Materials

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The ultra-fast laser heating process of nano-films is characterized by an ultra-short duration and ultra-small space size, in which the classical Fourier law based on the hypothesis of local equilibrium is no longer applicable. Based on the Cattaneo–Vernotte (CV) model and the dual-phase-lag (DPL) model, the two-dimensional analytical solutions of heat conduction in nano-films under ultra-fast laser are obtained using the integral transformation method. The results show that there is a thermal wave phenomenon inside the film, which becomes increasingly evident as the elapse of the lag time of the temperature gradient. Moreover, the wave amplitude in the vertical direction is much larger than that in the horizontal direction of the nano-film. By comparing the numerical result of the two models, it is found that the temperature distribution inside the nano-film based on the DPL model is gentler than that of the CV model. Additionally, the temperature distribution in the two-dimensional solution is lower than that in the one-dimensional solution under the same Knudsen number. In the comparison results of the CV model, the maximum peak difference in the thermal wave reaches 75.08 K when the Knudsen number is 1.0. This demonstrates that the horizontal energy carried by the laser source significantly impacts the temperature distribution within the film.

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