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

Published online by Cambridge University Press:  05 August 2002

NAOHIRO YAMAGUCHI ,
CHIEMI FUJIKAWA ,
KAZUNOBU OKASAKA  and
TAMIO HARA
NAOHIRO YAMAGUCHI
Affiliation:
Toyota Technological Institute, 2-12-1 Hisakata, Tempaku, Nagoya 468-8511, Japan
CHIEMI FUJIKAWA
Affiliation:
Toyota Technological Institute, 2-12-1 Hisakata, Tempaku, Nagoya 468-8511, Japan Present address: Tokyo Institute of Polytechnics, 1583 Iiyama, Atsugi, Kanagawa 243-0927, Japan
KAZUNOBU OKASAKA
Affiliation:
Toyota Motor Corporation, Nishihirose, Toyota 470-0309, Japan
TAMIO HARA
Affiliation:
Toyota Technological Institute, 2-12-1 Hisakata, Tempaku, Nagoya 468-8511, Japan
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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.

Keywords

Micro-dot array irradiationPulse-train laserRecombining plasma schemeSoft X-ray spectraX-ray lasers
Type
Research Article
Information
Laser and Particle Beams , Volume 20 , Issue 1 , January 2002 , pp. 73 - 77
Copyright
© 2002 Cambridge University Press

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