Fig. 1. Plasma temperature varying with time in presence of cavity (cavity width of 1.4 cm)

Fig. 2. Plasma density varying with time in presence of cavity (cavity width of 1.4 cm)

Fig. 3. Temperature and density of plasma with or without cavity at simulation time of 1000 ns. (a) Temperature; (b) density

Fig. 4. Electron temperature varying with time at different positions above Al surface

Fig. 5. Electron number density varying with time at different positions above Al surface

Fig. 6. Electron temperature varying with time at 1 cm above Al surface with or without cavity

Fig. 7. Electron number density varying with time at 1 cm above Al surface with or without cavity

Fig. 8. Spectral signal intensity of Al at wavelength of 396.15 nm obtained by simulation

Fig. 9. Spectral signal intensity of Al at wavelength of 396.15 nm obtained by experiment