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Production of highly ionized plasma by micro-dot array irradiation and its application to compact X-ray lasers

  • NAOHIRO YAMAGUCHI (a1), CHIEMI FUJIKAWA (a1) (a2), KAZUNOBU OKASAKA (a3) and TAMIO HARA (a1)

Abstract

A plasma production method using the irradiation of an array of small spots has been investigated from the point of view of soft X-ray laser generation in the recombining plasma scheme pumped by a pulse-train laser. The expansion geometry of highly ionized ions produced by the micro-dot array irradiation method has been measured and compared with that by a simple line irradiation. Spatial distribution of gain coefficients of the Li-like Al ion transition lines have also been measured for both irradiation methods. Highly ionized ions were observed to spread wider in the micro-dot array irradiation method. It is expected that rapid expansion and efficient cooling are achieved in plasmas produced by the micro-dot array irradiation method, which is consistent with the experimental results on the spatial structure of the X-ray laser gain region.

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Corresponding author

Address correspondence and reprint requests to: Naohiro Yamaguchi, Toyota Technological Institute, 2-12-1 Hisakata, Tempaku, Nagoya 468-8511, Japan. E-mail: yamagch@toyota-ti.ac.jp

Keywords

Production of highly ionized plasma by micro-dot array irradiation and its application to compact X-ray lasers

  • NAOHIRO YAMAGUCHI (a1), CHIEMI FUJIKAWA (a1) (a2), KAZUNOBU OKASAKA (a3) and TAMIO HARA (a1)

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