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Ion temperature measurement by laser‐induced fluorescence spectroscopy in panta
摘要： A laser-induced ?uorescence spectroscopy system was developed in a linear magnetized helicon plasma at Kyushu University. The thermal Doppler broadening on velocity distribution function follows the Maxwell distribution, and the averaged central ion temperature was evaluated to be ～0.36 eV. The effect of Zeeman splitting was observed for a more accurate assessment of the measurement and is consistent with the calculation. The temperature ratio of electrons and ions, T i /T e, was evaluated to be ～0.1. The result is valuable for evaluating the nonlinear processes of the plasma turbulence. ? 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
关键词： plasma ion temperature measurement,laser-induced ?uorescence,linear magnetized plasma
更新于2025-09-19 17:13:59
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Carbon multicharged ions emission from femtosecond laser plume
摘要： Carbon ion emission from femtosecond laser ablation of a glassy carbon target is studied. A Ti:sapphire laser (pulse duration τ ~ 150 fs, wavelength λ = 800 nm, laser fluence F ≤ 6.4 J cm?2) is used to ablate the carbon target while ion emission is detected by a time-of-flight detector equipped with a three-grid retarding field analyzer. A strong effect of the laser pulse fluence on the yield of carbon ions is observed. Up to C6+ ions are detected. The carbon ion time-of-flight signal is fit to a shifted Maxwell-Boltzmann distribution and used to extrapolate the effective plasma ion temperature Tieff = 6.9 eV. Applying an external electric field along the plasma expansion direction increases ion extraction, possibly due to the retrograde motion of the plasma-vacuum edge.
关键词： Femtosecond laser ablation,Time-of-flight,Plasma ion temperature,Carbon multicharged ions,Shifted Maxwell-Boltzmann distribution
更新于2025-09-12 10:27:22