Preliminary results on CETAL-PW laser generation of high-energy electron beams in low-density He 99% – N2 1% mixture gas jet
The aim of this work is to present the most recent results on first laser-accelerated electron beams with maximum energies up to ~500 MeV, obtained in Romania. Ultra-short pulses of 35 fs were focused on supersonic gas jets of low-density He 99% – N2 1% mixture at laser energy on target 2.3 J ≤ ELonT ≤ 3.7 J. Laser and plasma parameters leading to the generation of electron beams with different types of spectral characteristics, such as mono-peak, multi-peak, continuous with the spiky part, and average maximum energies between 180 MeV and 380 MeV are presented. Special attention is given to the experimental conditions for obtaining relatively stable (rms pointing stability of about 5 mrad) quasi-monoenergetic electron beams.
