Abstract
We have generated relativistic electrons by interaction between a high intensity ultra‐short laser pulse (Ti:Sapphire, max 12TW, λ = 790nm , 50fs, 10Hz) and a supersonic gas‐jet. Shock‐wave free supersonic nozzles were designed, to perform well‐defined laser plasma interaction experiments. The energetic electrons (up to 40MeV) ejected from the gas‐jet with a narrow cone angle were observed under the conditions of the relativistic laser intensity of 1.0 × 1019 W/cm2 and the helium gas jet density range of 1.4 – 3.0 ×1019cm−3. It was found that generation of the narrow‐cone energetic electrons depended strongly on the laser pre‐pulse duration and that the proper pre‐pulse was essential for the generation.
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