Implementing time resolved electron temperature capability at the NIF using a streak camera

Khan, S. F.; Jarrott, L. C.; Patel, P. K.; Izumi, N.; Ma, T.; MacPhee, A. G.; Hatch, B.; Landen, O. L.; Heinmiller, J.; Kilkenny, J. D.; Bradley, D. K.

doi:10.1063/1.5039382

Title: Implementing time resolved electron temperature capability at the NIF using a streak camera

Journal Article · 21 October 2018 · Review of Scientific Instruments

DOI: https://doi.org/10.1063/1.5039382 · OSTI ID:1497302

Khan, S. F. ^[1];

^[1]; Patel, P. K. ^[1];

^[1]; Ma, T. ^[1];

^[1]; Hatch, B. ^[1];

^[1]; Heinmiller, J. ^[2]; Kilkenny, J. D. ^[3]; Bradley, D. K. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Nevada National Security Site, Livermore, CA (United States)
General Atomics, San Diego, CA (United States)

A new capability on NIF has been implemented to measure the temperature of x-ray emitting sources. Although it is designed primarily for Inertial Confinement Fusion (ICF), it can be used for any hot emitting source that is well modeled. The electron temperature (T_e) of the hot spot within the core of imploded inertial confinement fusion capsules is an effective indicator of implosion performance. Currently, there are spatially and temporally integrated T_e inferences using image plates. A temporally resolved measurement of Te will help elucidate the mechanisms for hot spot heating and cooling such as conduction to fuel, alpha-heating, mix and radiative losses. To determine the temporally resolved T_e of hot spots, specific filters are added to an existing x-ray streak camera “Streaked Polar Instrumentation for Diagnosing Energetic Radiation (SPIDER)” to probe the emission spectrum during the x-ray burn history of implosions on the National Ignition Facility (NIF). One of the difficulties in inferring the hot spot temperature is the attenuation of the emission due to opacity from the shell and fuel. Therefore, a series of increasingly thick titanium filters were implemented to isolate the emission in specific energy regions that are sensitive to temperatures above 3keV while not significantly influenced by the shell/fuel attenuation. Additionally, a relatively thin zinc filter was used to measure the contribution of colder emission sources. Since the signal levels of the emission through the thicker filters are relatively poor, a dual slit (aperture) was designed to increase detected signal at the higher end of the spectrum. Herein, the design of the filters and slit are described, an overview of the solving technique is provided, and initial electron temperature results are reported.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1497302

Report Number(s):: LLNL-JRNL--750877; 936400

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 89; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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