Experiments on bright-field and dark-field high-energy electron imaging with thick target material

Abstract

High-energy charged particle radiography has been used for diagnostics of high-energy density matter, and electrons can serve as a promising radiographic probe that acts as a complement to commonly used proton probes. Here we report on an electron radiography experiment using 45 MeV electrons from an S-band photoinjector, where scattered electrons, after interacting with a sample, are collected and imaged by a quadrupole imaging system. We achieve a spatial resolution of a few microns (∼4 μm) and a thickness resolution of a few percent for a silicon target of 300-600 μm in thickness. With additional dark-field images captured by selecting electrons with large scattering angles, we show that complementary information for determining external details such as outlines, boundaries and defects can be obtained.

Ultrafast High-Energy Electron Radiography Application in Magnetic Field Delicate Structure Measurement

“…Relativistic speed beams are taken easily by making the electrons penetrate specimen with millimeter size in several tens of picoseconds; compared with the other relativistic particles, electron has lower magnetic rigidity, which makes it more sensitive to the electromagnetic field; besides, ultrashort bunch is taken easier, to ensure the quasistatic of diagnosed specimen. High-energy electron radiography (HEER) has been developed at LANL, Tsinghua University and Institute of Modern Physics, Chinese Academy of Science, in the past several years [20][21][22][23][24][25][26]. The several microns spatial resolution has been also taken in the experiment.…”

Visualizing the melting processes in ultrashort intense laser triggered gold mesh with high energy electron radiography

“…As an alternative option to intensively studied proton radiography, high energy electron radiography (HEER) 12 has drawn considerable interest due to its potentials to provide high spatiotemporal resolution with much easier accessibility and manipulability. Recent works have improved spatial resolution of HEER to a few microns 13,14 and applied this technique to image dynamic processes 14 . However, full advantages of high energy electron probes with short pulse duration and flexibly tunable time structure have not been taken yet, and this is especially true when using high brightness electron probes generated from state-of-the-art RF photo-injectors.…”

Three-Dimensional High-Energy Electron Radiography Method for Static Mesoscale Samples Diagnostics

“…High-energy electron radiography (HEER) was proposed as a high spatial and temporal resolution probe tool for high-energy-density physics (HEDP) and inertial confinement fusion (ICF) experimental diagnostic studies [1,2]. In recent years, HEER technology was well developed through both simulations and experiments [3][4][5][6][7][8]. Radiography can be performed with a ps pulse-width electron beam, achieving a spatial resolution close to 1 µm in an experiment with a large magnification imaging lens [9].…”