open access

https://hdl.handle.net/2115/93519

Joint measurement of electron density, temperature, and emission spectrum of Nd:YAG laser-produced tin plasma

英語

2023-11-13

AIP Publishing

Applied physics letters

123(20)

204103

We present the results of joint measurements of electron density (n(e)), temperature (T-e), and emission spectra of an Nd:YAG-driven tin plasma. Collective Thomson scattering provides space- and time-resolved n(e) and T-e data during drive laser irradiation, and extreme ultraviolet (EUV) emission spectra, which is space-resolved in the target normal, are measured using a flat-field grazing incidence spectrometer (GIS). As the distance from the target increased, the emission intensity quickly decreases, and the peaks of the spectra gradually shift to longer wavelengths. This can be explained by the rapid decrease in n(e), and thus, self-absorption, with an increase in distance. We obtain the EUV spectra by calculating the transfer of photons along the line-of-sight of the GIS, using theoretical emissivity and opacity, and applying the measured spatial distribution of n(e) and T-e. The results quantitatively demonstrate that the self-absorption effect is significant; the emission from the core regions is mostly reabsorbed by the surrounding plasma. The calculated spectra are compared with the measured spectra. While good agreement is achieved in the spectral region of 13.3 and 15.3 nm, considerable differences are found in the 12.5-13 and 15.5-17.5 nm region. The results demonstrate the significance of this joint measurement for further validation of the atomic process model considering self-absorption effect, which is critical for the future high-density, solid laser-driven EUV source.

学術雑誌論文

Version of Record

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Y. Pan, K. Tomita, A. Sunahara, A. Sasaki, K. Nishihara; Joint measurement of electron density, temperature, and emission spectrum of Nd:YAG laser-produced tin plasma. Appl. Phys. Lett. 13 November 2023; 123 (20): 204103 and may be found at https://doi.org/10.1063/5.0174185.

0003-6951