Ultrahigh-energy density state in nanowire arrays irradiated with picosecond kilojoule-class ultra-intense laser

Ultrahigh-energy density state in nanowire arrays irradiated with picosecond kilojoule-class ultra-intense laser

Ultrahigh-energy density (UHED) states greater than 1 Gbar pressure are typically observed under extreme conditions, such as in the core of an inertial confinement fusion implosion. A novel alternative approach for generating volumetric UHED states is to use nanowire arrays irradiated with a femtose...

Full description

Saved in:
Bibliographic Details
Published in:AIP advances Vol. 13; no. 12; pp. 125118 - 125118-9
Main Authors: Tanaka, D., Maeda, Y., Hironaka, Y., Kawasaki, K., Higashi, N., Iwata, N., Sentoku, Y., Kodama, R., Ozaki, N., Somekawa, T., Shinguubara, S., Shimizu, T., Sawada, H., Shigemori, K.
Format: Journal Article
Language:English
Published: Melville American Institute of Physics 01-12-2023
AIP Publishing LLC
Subjects:
Arrays
Emission analysis
Hot electrons
Inertial confinement fusion
Lasers
Metal foils
Nanowires
Ultrahigh intensity lasers
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Ultrahigh-energy density (UHED) states greater than 1 Gbar pressure are typically observed under extreme conditions, such as in the core of an inertial confinement fusion implosion. A novel alternative approach for generating volumetric UHED states is to use nanowire arrays irradiated with a femtosecond ultrahigh-intensity laser. In this paper, we present an experimental investigation on laser absorption and energy transport in nanowire arrays irradiated with a picosecond kilojoule petawatt laser. The laser–target interactions were studied by measuring the x-ray emission and escaping hot electrons from a bare Cu foil and a foil with a nanowire array grown on its surface. The measured Cu-Kα and He-α emissions from the nanowire array were higher than those from the flat foil. In addition, hot electrons observed from the front surface of the nanowire array were enhanced. On the other hand, despite the stronger Kα emission from the nanowire array and the enhancement of hot electrons escaping from the front surface of the nanowire array, the number of hot electrons observed from the rear side of the flat foil target was slightly lower than that of the flat foil. A comparison of the experimental results with the results of a two-dimensional particle-in-cell simulation code suggested that the magnetic fields generated around the periodic nanowire array trap hot electrons, improving the electron-to-target energy coupling and efficiently producing UHED states.
ISSN:2158-3226
2158-3226
DOI:10.1063/5.0175090