X-ray line emission from H-like and He-like ions in magnesium plasma produced by multi-picosecond laser pulses

Prasad A. Naik; Vipul Arora; Riyaz A. Khan; Parshotam Dass Gupta

doi:10.1117/12.536940

12 December 2003 X-ray line emission from H-like and He-like ions in magnesium plasma produced by multi-picosecond laser pulses

Prasad A. Naik, Vipul Arora, Riyaz A. Khan, Parshotam Dass Gupta

Author Affiliations +

Proceedings Volume 5228, ECLIM 2002: 27th European Conference on Laser Interaction with Matter; (2003) https://doi.org/10.1117/12.536940
Event: ECLIM 2002: 27th European conference on Laser Interaction with Matter, 2002, Moscow, Russian Federation

Abstract

We report a spectroscopic study of x-ray line emission from a magnesium plasma produced by Nd:glass laser pulses of 30 ps (FWHM) duration at a laser intensity of ~ 3 x 10¹⁴ Wcm^-2. High-resolution x-ray line spectrum was recorded using a crystal spectrograph. Measurements of continuum radiation intensity were also performed for different x-ray filter cutoff energies. A peak electron temperature of ~ 2.4 keV derived from these measurements is in agreement with that calculated from an analytical model describing laser plasma heating in the short pulse regime. The intensity ratio of MgXII 1s-2p, λ = 8.42 Å and MgXI 1s²-1s2p, λ = 9.17 Å is observed to be much smaller than that calculated from the spectroscopic code RATION. Analytical estimates of ionization equilibrium time for different ionization states in the heated plasma as well as during its expansion using a simple hydrodynamic model can explain this behavior.

Citation Download Citation

Prasad A. Naik, Vipul Arora, Riyaz A. Khan, and Parshotam Dass Gupta "X-ray line emission from H-like and He-like ions in magnesium plasma produced by multi-picosecond laser pulses", Proc. SPIE 5228, ECLIM 2002: 27th European Conference on Laser Interaction with Matter, (12 December 2003); https://doi.org/10.1117/12.536940

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