Characterization of laser plasmas for interaction studies

Year: 1994

Authors: Gizzi LA., Giulietti D., Giulietti A., Afsharrad T., Biancalana V., Chessa P., Danson C., Schifano E., Viana SM., Willi O.

Autors Affiliation: CNR, Ist Fis Atom & Molec, via Giardino 7, I-56127 Pisa, Italy; Univ Pisa, Dipartimento Fis, Piazza Torricelli 2, Pisa, Italy; Univ London imperial Coll Sci Technol & Med, Blackett Lab, Price Consort Rd, London, England; Rutherford Appleton Lab, Cent Laser Facil, Didcot OX11 0QX, Oxon England; Ecole Polytech, Utilisat Lasers Interses Lab, F-91128 Palaiseau, France

Abstract: Long scale length plasmas were produced by uniform laser irradiation from opposite sides of metal disks coated on thin plastic stripe targets. The plasma became fully underdense before the end of the 600-ps pulse. The evolution of the plasma was carefully characterized both in electron density and temperature, and the experimental data were compared to the predictions of a one-dimensional hydrodynamics computer code. The electron temperature was obtained from time-resolved x-ray spectra by line-ratio measurements, accounting for opacity effects. Two-dimensional electron density profiles of a large plasma region were obtained by Nomarski interferometry at different times. They showed that the expansion was axially symmetric and reproducible shot by shot. The plasma was found to be substantially free from small-scale density inhomogeneities. The plasma produced with this techique is very suitable for interaction experiments. In particular, laser stimulated plasma instabilities of relevance for laser fusion can be accurately studied in these conditions.


Volume: 49 (6)      Pages from: 5628  to: 5643

KeyWords: long-scale-length; stimulated raman-scattering; large underdense plasma; light; filamentation
DOI: 10.1103/PhysRevE.49.5628

Citations: 63
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