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Title: Raster Thomson scattering in large-scale laser plasmas produced at high repetition rate

Journal Article · · Review of Scientific Instruments
DOI: https://doi.org/10.1063/5.0059244 · OSTI ID:1850372
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [2]; ORCiD logo [4]; ORCiD logo [2]
  1. Univ. of California, Los Angeles, Los Angeles, CA (United States). Dept. of Physics and Astronomy; Univ. of California, Los Angeles, Los Angeles, CA (United States)
  2. Univ. of California, Los Angeles, Los Angeles, CA (United States). Dept. of Physics and Astronomy
  3. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  4. Princeton Univ., Princeton, NJ (United States). Dept. of Physics and Astronomy

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 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 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 4×1016 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.

Research Organization:
Univ. of California, Los Angeles, CA (United States); Univ. of California, San Diego, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003842; SC0019011; SC0021133
OSTI ID:
1850372
Journal Information:
Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 9 Vol. 92; ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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