Plasma and Fusion Research

Volume 20, 2406003 (2025)

Regular Articles


Water-Window Soft X-Ray Spectra from Dual Laser-Produced Bi Plasmas
Tomoyoshi TOIDA1), Tsukasa SUGIURA1), Hayato YAZAWA1), Hiroki MORITA1), Shinichi NAMBA2) and Takeshi HIGASHIGUCHI1)
1)
Department of Electrical and Electronic Engineering, Utsunomiya University, Utsunomiya 321-8585, Japan
2)
Department of Advanced Science and Engineering, Hiroshima University, Higashihiroshima 739-8527, Japan
(Received 15 July 2024 / Accepted 10 September 2024 / Published 22 January 2025)

Abstract

We described the spectral behavior of the water-window soft x-ray emission in detail by dual laser pulse irradiation. We also observed the spatial separation of the soft x-ray emission and fast ions produced using dual pulse irradiation. Soft x-ray emission distribution was almost isotropic, and the fast ions were emitted to the target normal along the pre-pulse laser axis. The soft x-ray emission was maximized at a delay time of 50 ns between the pre-pulse, and the main laser heating pulse when the pre-plasma was irradiated at a distance of 50 µm above the target.


Keywords

water window, soft x-ray, optical thickness, bismuth, highly charged ion (HCI)

DOI: 10.1585/pfr.20.2406003


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