Diagnostic study of laser-produced tungsten plasma using optical emission spectroscopy and time-of-flight mass spectroscopy

Temporal and spatial dynamics of optical emission from laser ablation of the first wall materials of fusion device

“…In the process of lasermatter interaction, the laser energy absorbed or the plasma produced via Inverse Bremsstrahlung, Photoionization (PI) and Self-Ionization (SI) are in a few ns scales. In the LPP of high-Z element (W), the multi-charged ions are predominant in the early state of preliminary plasma [30]. With the increasing delay time (evolution of plasma), the single ionized W + ions appeared gradually due to the complex physical processes mainly electron and ions recombination radiation.…”

“…In this case, the proper timing (gate delay setting) is an important parameter in the detection design in order to obtain the maximum spectral intensity and maximum SBR value. In our previous work, the velocities of the particles were calculated by knowing the position of measurement and time of arrival of corresponding peaks in the time evolution profiles [30]. In this work, the estimated using the distance of two different observing positions dividing by the delay time of arriving peak intensity.…”

Electron and ion emission characteristics of metal irradiated by nanosecond laser

“…Some related physical mechanisms have also been described. Currently, it is widely believed that ultrafast ions mainly appear in high Z metals (Mo, Ta and W) [20][21][22], and the related mechanisms are still controversial, including the role of metal surface pollutants [20], the acceleration effect of forward electrons on multi-charged ions [21][22][23].…”

On the delayed emission from a laser-produced aluminum plasma under an argon environment

“…Laser-produced plasmas (LPPs) have drawn substantial attention of scientic community due to their numerous applications like lithography, 1-3 nano-particle generation, 4,5 cluster formation, 6,7 laser-induced breakdown spectroscopy (LIBS), [8][9][10][11] radiography, 12,13 mass spectroscopy, [14][15][16] thin-lm decomposition, 17 generation of ion sources, 18,19 acceleration, 20,21 inertial connement fusion, 22,23 plasma diagnostics, [24][25][26] etc. Despite numerous experimental studies and extensive theoretical modeling on LPPs, the plasma plume evolution still presents challenges due to its complexity and transient nature.…”