Plasma and Fusion Research
Volume 20, 2406003 (2025)
Regular Articles
- 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
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)
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