We have recently demonstrated significant improvements to the resolution and sensitivity of the NIF gamma imaging system by replacing the existing EJ262 plastic scintillator with the Ce-doped gadolinium garnet transparent ceramic scintillator GYGAG. Penumbral imaging of inelastic gammas emitted during inertial confinement fusion (ICF) experiments at NIF can be used to recover the time integrated spatial distribution of the remaining shell during the fusion burn, the technique is therefore a critical diagnostic for understanding the failure modes and quality of NIF implosions. In this work we discuss GEANT4 calculations of the relative sensitivities of GYGAG and EJ262 as well as rolled edge measurements made on NIF shot N221204 in December 2022, for the purpose of directly comparing the spatial resolution of each scintillator in-situ.
Measuring the X-ray environment generated at the center of the NIF target chamber is a core capability
required for understanding target implosions and other physics experiments. Recently an upgrade was
performed to the recording systems employing modern digital technology and additional remote-control
capabilities. Together, significantly decreasing manual setup burdens, increasing accuracy, stability and
availability while contributing to shot rate improvement, overall efficiency and cost of operations reduction on
NIF. We present the systems chosen, improved calibration techniques employed and some of the key features
including the addition of self-test capabilities.
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