Numerical simulation of laser ablation of molybdenum target for laser-induced breakdown spectroscopic application

Fu, Cailong; Wang, Qi; Ding, Hongbin

doi:10.1088/2058-6272/aab661

Cited by 8 publications

(3 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the present calculations, the following values of the above parameters are taken: I 0 = 9.0 × 10 15 W m −2 , 2τ = 6 ns, C 1 = 4.5208, C 2 = 0.7788, ω 0 = 60 micron, n = 1.000 29, and λ 0 = 532 nm. The absorption coefficient α is taken as the sum of the electron-neutral α IB,e-n and the electron-ion α IB,e-i inverse Bremsstrahlung absorption coefficients and are calculated by the following relations [16].…”

Section: Initial Conditionsmentioning

confidence: 99%

On the radiative heat loss and axis-switching phenomena of a decaying laser spark

Joarder

Vellala

Singh

et al. 2021

Plasma Sources Sci. Technol.

View full text Add to dashboard Cite

A three-dimensional numerical simulation of a decaying laser spark in gaseous nitrogen has been carried out in Cartesian co-ordinate. The simulation starts with the introduction of a laser pulse in the domain. Thermal equilibrium has been assumed throughout the numerical simulation involving the species N2, N, N+, e−. The boundary conditions are treated following characteristic property of the waves to ensure smooth transmission of the blast wave out of the computational domain. The previously unexplained axis-switching phenomenon of the breakdown region has been explained, and a qualitative comparison of the same with experimental schlieren images has been made. The total radiation loss, including the loss during the breakdown, has been calculated. The variation of inverse Bremsstrahlung radiation, black body radiation, and spectral radiation of atomic nitrogen with time have been shown separately. Additionally, the temporal variation of radiation intensity of atomic nitrogen over a wavelength range has been plotted. The total radiation loss has been found to be small compared to the deposited laser energy.

show abstract

Section: Initial Conditionsmentioning

confidence: 99%

On the radiative heat loss and axis-switching phenomena of a decaying laser spark

Joarder

Vellala

Singh

et al. 2021

Plasma Sources Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Figure 1 illustrates the schematic of the SEP event forecast procedure. In this method, we average the solar wind data (including solar wind velocity, plasma temperature, plasma number density and magnetic field strength) observed by the ACE satellite, and feed them into the 1D polytropic model (Fu & Hu 1995) to calculate the background solar wind parameters at the inner boundary (0.1 AU, about 20 R e ). In addition to the initial background solar wind parameters at the inner boundary, the iPATH model also requires CME eruption parameters as initial conditions.…”

Section: The Sep Forecast Tool Setsmentioning

confidence: 99%

Ensemble Numerical Simulations of Realistic SEP Events and the Inspiration for Space Weather Awareness

Du¹,

Ao²,

Luo³

et al. 2022

Res. Astron. Astrophys.

View full text Add to dashboard Cite

The solar energetic particle (SEP) event is a kind of hazardous space weather phenomenon, so its quantitative forecast is of great importance from the aspect of space environmental situation awareness. We present here a set of SEP forecast tools, which consists of three components: 1) a simple polytropic solar wind model to estimate the background solar wind conditions at the inner boundary of 0.1AU (about 20 R⊙); 2) an ice-cream-cone model to estimate the erupted CME parameters; and 3) the improved Particle Acceleration and Transport in the Heliosphere (iPATH) model to calculate particle fluxes and energy spectra. By utilizing the above models, we have simulated six realistic SEP events from August 14, 2010 to September 10, 2014, and compared the simulated results to the GOES spacecraft observations. The results show that the simulated fluxes of > 10MeV particles agree with the observations while the simulated fluxes of > 100MeV particles are higher than the observed data. One of the possible reasons is that we have adopted a simple method in the model to calculate the injection rate of energetic particles. Furthermore, we have conducted the ensemble numerical simulations over these events and investigated the effects of different background solar wind conditions at the inner boundary on SEP events. The results imply that the initial CME density plays an important role in determining the power spectrum, while the effect of varying background solar wind temperature is not significant. Naturally, we have examined the influence of CME initial density on the numerical prediction results for virtual SEP cases with different CME ejection speeds. The result shows that the effect of initial CME density variation is inversely associated with CME speed.

show abstract

“…Up to now, many hydrodynamic models including KL and plasma shielding effect [17][18][19][20][21][22][23][24] have been proposed to simulate the interaction between ns-laser, target and plasma. However, most of the models [17,20,24] only consider the contribution of thermal energy and ionization energy to the internal energy of the plasma in the equation of state, ignoring the excitation energy. Some models [18,19,23] even used the ideal gas approximation of the plasma, and the ionization and excitation energies in the internal energy have been neglected.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of nanosecond laser ablation and plasma characteristics considering a real gas equation of state

Liu¹,

Qin²,

Su³

et al. 2021

Plasma Sci. Technol.

View full text Add to dashboard Cite

Based on the governing equations which include the heat conduction equation in the target and the fluid equations of the vapor plasma, a two-dimensional axisymmetric model for ns-laser ablation considering the Knudsen layer and plasma shielding effect is developed. The equations of state of the plasma are described by a real gas approximation, which divides the internal energy into the thermal energy of atoms, ions and electrons, ionization energy and the excitation energy of atoms and ions. The dynamic evolution of the silicon target and plasma during laser ablation is studied by using this model, and the distributions of the temperature, plasma density, Mach number related to the evaporation/condensation of the target surface, laser transmissivity as well as internal energy of the plasma are given. It is found that the evolution of the target surface during laser ablation can be divided into three stages: (1) the target surface temperature increases continuously;(2) the sonic and subsonic evaporation; and (3) the subsonic condensation. The result of the internal energy distribution indicates that the ionization and excitation energy plays an important role in the internal energy of the plasma during laser ablation. This model is suitable for the case that the temperature of the target surface is lower than the critical temperature.

show abstract

Numerical simulation of laser ablation of molybdenum target for laser-induced breakdown spectroscopic application

Cited by 8 publications

References 39 publications

On the radiative heat loss and axis-switching phenomena of a decaying laser spark

On the radiative heat loss and axis-switching phenomena of a decaying laser spark

Ensemble Numerical Simulations of Realistic SEP Events and the Inspiration for Space Weather Awareness

Numerical simulation of nanosecond laser ablation and plasma characteristics considering a real gas equation of state

Contact Info

Product

Resources

About