M. Lamac | Searcharxiv

arXiv2023

Ultrarelativistic electron beams accelerated by terawatt scalable kHz laser

We show the laser-driven acceleration of unprecedented, collimated ($ 2 \ \mathrm{mrad} $ divergence), and quasi-monoenergetic ($ 25 \ \% $ energy spread) electron beams with energy up to $ 50 \ \mathrm{MeV} $ at $ 1 \ \mathrm{kHz} $ repetition rate. The laser driver is a multi-cycle ($ 15 \ \mathrm{fs} $) $ 1 \ \mathrm{kHz} $ optical parametric chirped pulse amplification (OPCPA) system, operating at $ 26 \ \mathrm{mJ} $ ($ 1.7 \ \mathrm{TW} $). The scalability of the driver laser technology and the electron beams reported in this work pave the way towards developing high-brilliance x-ray sources for medical imaging, innovative devices for brain cancer treatment, and represent a step towards the realization of a kHz GeV electron beamline.

physics.plasm-ph↗

arXiv2022

Development of LPA based hard X-ray sources at ELI Beamlines

We report the laser-plasma accelerator-based X-ray sources development at ELI beamlines. One of the main objectives of ELI Beamlines is to provide beams of ultrashort particle and complex X-ray sources to users from various research fields. Two hard X-ray betatron sources with high photon flux based on laser-plasma acceleration (LPA) are being commissioned. The first source is the Gammatron beamline located in Experimental Hall E2. It provides X-ray pulses of energies from 1-100 keV in betatron and up to a MeV in Compton scheme. A novel X-ray optics has been designed as a focusing optics of these hard X-ray sources for the user application. The second hard X-ray source based on LPA is being developed in the ELI plasma physics platform (P3) that will serve as an active diagnostics HED and Laboratory astrophysics, multi-beam experiments, and fundamental research. This source is now being commissioned, we will present the first experimental results. Besides, we have proposed a novel scheme for enhancing the X-ray flux based on betatron oscillations enhanced from nonlinear resonances due to interaction with a two-color laser field. In addition, we will introduce a novel optical probing technique with high sensitivity to characterize a low-density gas target for a laser-plasma accelerator. It has been achieved by employing multiple passes of the probe beam through the object and relay-imaging of the object between the individual passes.

physics.acc-ph↗