Raster Thomson scattering in large-scale laser plasmas produced at high repetition rate.
| Autor: | Kaloyan M; Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095, USA., Ghazaryan S; Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095, USA., Constantin CG; Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095, USA., Dorst RS; Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095, USA., Heuer PV; Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623, USA., Pilgram JJ; Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095, USA., Schaeffer DB; Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08540, USA., Niemann C; Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095, USA. |
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| Jazyk: | angličtina |
| Zdroj: | The Review of scientific instruments [Rev Sci Instrum] 2021 Sep 01; Vol. 92 (9), pp. 093102. |
| DOI: | 10.1063/5.0059244 |
| Abstrakt: | We present optical Thomson scattering measurements of electron density and temperature in a large-scale (∼2 cm) exploding laser plasma produced by irradiating a solid target with a high-energy (5-10 J) laser pulse at a high repetition rate (1 Hz). The Thomson scattering diagnostic matches this high repetition rate. Unlike previous work performed in single shots at much higher energies, the instrument allows for point measurements anywhere inside the plasma by automatically translating the scattering volume using motorized stages as the experiment is repeated at 1 Hz. Measured densities around 4 × 10 16 cm -3 and temperatures around 7 eV result in a scattering parameter near unity, depending on the distance from the target. The measured spectra show the transition from collective scattering close to the target to non-collective scattering at larger distances. Densities obtained by fitting the weakly collective spectra agree to within 10% with an irradiance calibration performed via Raman scattering in nitrogen. |
| Databáze: | MEDLINE |
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