High-energy betatron source driven by a 4-PW laser with applications to non-destructive imaging
Abstract
Petawatt-class lasers can produce multi-GeV electron beams through laser wakefield electron acceleration. As a by-product, the accelerated electron beams can generate broad synchrotron-like radiation known as betatron radiation. In the present work, we measure the properties of the radiation produced from 2 GeV, 215 pC electron beams, which shows a broad radiation spectrum with a critical energy of 515 keV, extending up to MeV photon energies and 10 mrad divergence. Due to its high energy and flux, such radiation is an ideal candidate for gamma-ray radiography of dense objects. We employed a compact betatron radiation setup operated at relatively high-repetition rates (0.1 Hz) and used it to scan cm-sized objects: a DRAM circuit, BNC and SMA connectors, a padlock and a gas jet nozzle. GEANT4 simulations were carried out to reproduce the radiograph of the gas jet. The setup and the radiation source can reveal the interior structure of the objects at the sub-mm level, proving that it can further be applied to diagnose cracks or holes in various components. The radiation source presented here is a valuable tool for non-destructive inspection and for applications in high-energy-density physics such as nuclear fusion.
Keywords
Cite
@article{arxiv.2211.07963,
title = {High-energy betatron source driven by a 4-PW laser with applications to non-destructive imaging},
author = {Calin Ioan Hojbota and Mohammad Mirzaie and Do Yeon Kim and Tae Gyu Pak and Mohammad Rezaei-Pandari and Vishwa Bandhu Pathak and Jong Ho Jeon and Jin Woo Yoon and Jae Hae Sung and Seong Ku Lee and Chul Min Kim and Ki Yong Kim and Chang Hee Nam},
journal= {arXiv preprint arXiv:2211.07963},
year = {2022}
}
Comments
15 pages, 6 figures