Bremsstrahlung data showing the dose on each channel plotted against the threshold energy for that channel. Note that the dosimeter sensitivity extends significantly beyond the threshold.
Snapshot of the PIC simulation at peak power. The Poynting flux and background electron density are shown in the bottom section of the plot. The hot electron energy flux is plotted in the top section. The electron distribution is measured in a 1 μm box at z = 120 μm.
Characteristics of the time-integrated electron distributions from the PIC simulation. (a) Energy spectrum and (b) spatial flux. The symmetric component is the peak at 107 μm and the asymmetric component has a peak at 99 μm. (c) Angular distribution for different energy groups showing a high energy component directed away from the laser axis.
(a) Bremsstrahlung signals from the 5 × 1019 W/cm2 simulation are broken down by original electron energy and plotted against measurements. (b) Simulated signals are normalized to the respective measured signals to visualize spectrum temperature and coupling efficiency for the two simulations, baseline (solid) and half intensity (dashed). (c) Simulated and measured ratios between different spectrometers are plotted for visualization of the electron divergence for the two simulations. Solid lines and dashed lines represent the nominal and half intensity cases, respectively. Red and blue represent the ratios of and , respectively.
Bremsstrahlung spectrometer ratios for the half intensity case for 4 cases for the high energy component: directed along target normal, directed along laser axis, no high energy component, and the best fit direction.
Reduced fitting parameter for the half intensity case as a function of the hot electron beam direction. The radial coordinate is θ and the azimuthal coordinate is . The target normal and laser axis directions are marked with white crosses, at the center and at , respectively.
Comparison of PIC simulations.
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