The extremely high electric fields sustainable by a plasma make the Laser Wakefield Acceleration (LWFA) the most compact technique to generate very highly relativistic electron beams in the GeV regime. The limited repetition rate and low efficiency of this technology has, to date, prevented to unleash its full potential as a unique source for basic research, biomedical applications and high flux sources of secondary radiations as hard X-rays and gamma-rays. In very recent years different works show a new research direction on electron acceleration at 1 kHz repetition rate.
In this talk I will show the laser-driven acceleration of unprecedented, collimated (2 mrad) and quasi-monoenergetic (ΔE/E = 25%) electron beams with energy up to 50 MeV at 1 kHz repetition rate. The laser driver is the in-house developed L1-Allegra multi-cycle (15 fs) 1 kHz OPCPA system, operating at 26 mJ (1.7 TW).
Said innovative results have been achieved in the new Laser Wakefield ALFA platform for user experiments developed at ELI-Beamlines.
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 forward to the realization of a kHz GeV electron beamline.
High-order harmonic generation (HHG) is a tabletop source of VUV radiation with many applications limited by a necessity for a specific photon energy and a monochromatized spectrum. The approach of using grating monochromators is not applicable for photon-hungry applications due to the high losses and pulse lengthening. We present experimental results of a wavelength-tunable monochromatic HHG source developed to tackle this challenge. We demonstrate this method using the L1 Allegra broadband OPCPA laser system at ELI-Beamlines and its conversion to UV used to pump the HHG.
Allegra laser system is one of the main laser sources of the ELI-Beamlines facility in the Czech Republic. The system is designed to operate at 1 kHz and >100 mJ output with the pulse duration of <15 fs at 820 nm central wavelength. The main role of the laser system includes driving plasma X-ray and high harmonic (HHG) secondary sources at ELI-Beamlines facility. In this submission we present the most recent results on the optimization of high-energy OPCPA amplification stages and discuss the operational performance of the laser system.
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