Experimental Study of Nanosecond Laser-Generated Plasma Channels

Year: 2020

Authors: Levato T., Nevrkla M., Nawaz MF., Giuffrida L., Grepl F., Zulic H., Pilar J., Hanus M., Divoky M., Lucianetti A., Mocek T., Margarone D

Autors Affiliation: CAS, ELI Beamlines, Inst Phys, Slovance 2, Prague 18221, Czech Republic; CNR, Ist Nazl Ott, Via G Moruzzi 1, I-56124 Pisa, Italy; Czech Tech Univ, Fac Nucl Sci & Phys Engn, Brehova 7, Prague 11519 1, Czech Republic; Czech Acad Sci, Inst Phys, HiLASE Ctr, Radnici 828, Dolni Brezany 25241, Czech Republic: Queens Univ Belfast, Ctr Plasma Phys, Belfast BT7 1NN, Antrim, North Ireland

Abstract: Generation of plasma-channels by interaction of gas targets with nanosecond laser beams was investigated experimentally. Such laser-generated plasma channels are very promising for subsequent guiding of high peak power femtosecond laser pulses, over several tens of centimeters, as required in laser wake field electron-acceleration (LWFA). The experimental setup was based on the use of a cylindrical lens (100 mm of focal length) with the aim of proposing a technical solution easy to be integrated into a compact experimental setup for acceleration of multi-GeV electron beams using high peak-power laser systems. A pilot experiment, showing production of asymmetric plasma channels over a length of several millimeters in N and Ar targets with initial neutral-gas atomic density around 5 x 10(19)cm(-3), is reported. Plasma effective threshold formation was estimated, along with future optimization of the optical setup for a symmetrization of such plasma channel. Scalability of this concept to several tens of centimeters is preliminarily discussed, along with the corresponding critical requirements for an optimal LWFA scheme.


Volume: 10 (12)      Pages from: 4082  to: 4082

KeyWords: LWFA; plasma guiding; nanosecond laser; laser-plasma acceleration
DOI: 10.3390/app10124082