The Scattered Light Time-history Diagnostic suite at the National Ignition Facility
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- Univ. of Rochester, NY (United States). Lab. for Laser Energetics
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Nevada National Security Site, Livermore, CA (United States)
The Scattered Light Time-history Diagnostic (SLTD) is being implemented at the National Ignition Facility (NIF) to greatly expand the angular coverage of absolute scattered-light measurements for direct- and indirect-drive inertial confinement fusion (ICF) experiments. The SLTD array will ultimately consist of 15 units mounted at a variety of polar and azimuthal angles on the NIF target chamber, complementing the existing NIF backscatter suite. Each SLTD unit collects and diffuses scattered light onto a set of three optical fibers, which transport the light to filtered photodiodes to measure scattered light in different wavelength bands: stimulated Brillouin scattering (350 nm–352 nm), stimulated Raman scattering (430 nm–760 nm), and ω/2 (695 nm–745 nm). SLTD measures scattered light with a time resolution of ~1 ns and a signal-to-noise ratio of up to 500. Currently, six units are operational and recording data. Measurements of the angular dependence of scattered light will strongly constrain models of laser energy coupling in ICF experiments and allow for a more robust inference of the total laser energy coupled to implosions.
- Research Organization:
- Univ. of Rochester, NY (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- NA0003856; AC52-07NA27344
- OSTI ID:
- 1769624
- Alternate ID(s):
- OSTI ID: 1768905; OSTI ID: 1812131
- Report Number(s):
- LLNL-JRNL-817695; 2019-334, 1627, 2578; TRN: US2206768
- Journal Information:
- Review of Scientific Instruments, Vol. 92, Issue 3; Conference: 23rd Topical Conference on High-Temperature Plasma Diagnostics, 113-17 Dec 2020; ISSN 0034-6748
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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