In:
Frontiers in Physics, Frontiers Media SA, Vol. 11 ( 2023-6-22)
Abstract:
Micro-structured targets can be employed to enhance the coupling of laser energy to the high energy density plasma. Here we report on experimental measurement of enhanced proton beam energy from laser-driven micro-wire array (MWA) targets along the backward direction. An ultra-intense ( ∼ 2 × 10 20 W / c m 2 ) laser pulse of ∼ 40 f s pulse duration interacts with the MWA structure and induces large population of energetic electrons. The enhanced sheath field efficiently accelerates protons both transversely and longitudinally. The spectrometers record proton cut-off energy of around 16 M e V and temperature 813 k e V along the backward direction, which is 20 % − 60 % higher than that of a flat target under commensurate laser conditions. Comparison with particle-in-cell simulations suggests that the enhancement originates from the increased temperature and population of the hot electrons within the micro-wires. These measurements provide a direct probe of the high energy density plasma condition in laser-driven solid targets and a useful benchmark for further studies on laser-driven micro-structured targets.
Type of Medium:
Online Resource
ISSN:
2296-424X
DOI:
10.3389/fphy.2023.1167927
Language:
Unknown
Publisher:
Frontiers Media SA
Publication Date:
2023
detail.hit.zdb_id:
2721033-9