Abstract
High-energy electron radiography (HEER) is a promising diagnostic tool for high-energy-density physics, as an alternative to tools such as X/γ-ray shadowgraphy and high-energy proton radiography. Impressive progress has been made in the development and application of HEER in the past few years, and its potential for high-resolution imaging of static opaque objects has been proved. In this study, by taking advantage of the short pulse duration and tunable time structure of high-energy electron probes, time-resolved imaging measurements of high-energy-density gold irradiated by ultrashort intense laser pulses are performed. Phenomena at different time scales from picoseconds to microseconds are observed, thus proving the feasibility of this technique for imaging of static and dynamic objects.
Highlights
High-energy-density physics (HEDP) is the study of matter under extreme conditions, often defined as >1 Mbar (100 GPa) pressure or >100 GJ/m3 energy density,1 such as those occurring in heavy-iondriven fusion,2 laser-driven fusion,3 and similar processes
As an alternative to the familiar proton radiography, high-energy electron radiography (HEER)12 has attracted considerable interest owing to its potential to provide high spatiotemporal resolution with much greater accessibility and ease of manipulation
We demonstrate the use of high-brightness electron probes and a compact imaging lens composed of high-gradient permanent magnet quadrupoles (PMQs) to capture the entire dynamic process of laser ablation of gold mesh over a long time scale, with spatiotemporal resolution on the scales of tens of picoseconds and micrometers
Summary
High-energy-density physics (HEDP) is the study of matter under extreme conditions, often defined as >1 Mbar (100 GPa) pressure or >100 GJ/m3 energy density, such as those occurring in heavy-iondriven fusion, laser-driven fusion, and similar processes. Under these conditions, the hydrodynamic response of the matter is a high expansion velocity in the range of micrometers per nanosecond (μm/ns), posing various challenges to diagnostic techniques, such as the need for high spatiotemporal resolution, high areal-density resolution, and a large dynamic range.. Scitation.org/journal/mre pump–probe scheme using an ultra-fast intense laser pump and a picosecond-long high-energy electron probe reveals its potential for direct visualization of fast dynamic phenomena in high-energydensity matter
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