Real-time characterisation of profiles of laser wakefield and electrons accelerated by few-cycle 1 kHz OCPA system

Abstract

In this report, we combine advantages of the recent developments in high repetition rate multi-Terawatt few-cycle femtosecond 1030 nm OPCPA system delivering 40-75 mJ 7-20 fs pulses at 1 kHz rate and novel sapphire supersonic micronozzles tuned for the formation of tailored plasma density profile and guiding of the LWFA beam. Using the time-resolved plasma shadowgraphy and polarimetry methods, the gas jet density, plasma wake profile and electron charge distribution of three types of helium supersonic micronozzles with the diameter of 100 μm, the array of 7 tailored micronozzles with the diameters of 100-400 μm and slit nozzle of 120 μm x 2 mm are characterized in real time