Inertial Confinement Fusion [quarterly rpt Jan-Mar 1999]

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A method for triplers is to grow the DKDP boule horizontally, which increases aspect ratio (now rotated) by eliminating one growth prism and adding a second pyramid. Again very recently, a good-quality horizontal DKDP boule, shown in Figure 8b, was grown for the first time to NIF size. Successful shape control could increase conversion crystal yields by a factor of two over that from symmetric, vertically grown boules. Laser Damage 1 mm FIGURE 7. Fingering growth of macrosteps on the KDP surface.

IBS uses an ion source that strikes a target to sputter atoms with higher arrival energies onto the substrate (Figure 4). The higher energy of the deposited particles from these techniques generates denser films than e-beam coatings. These lower-porosity UCRL-LR-105821-99-2 ENGINEERING HIGH-DAMAGE-THRESHOLD NIF POLARIZERS AND MIRRORS Substrate Laser Damage Substrate RGA Mask Particulates Particulates Ion source O2 Plume Electron beam Source material Heaters Monochromatic optical monitor FIGURE 3.

Figure 5 illustrates typical damage morphologies of hafnia–silica multilayer coatings. The four most common damage morphologies are: Delaminates grow at the lowest fluence and quickest rate, so improvements in the coating damage threshold must start with elimination of this morphology. Delaminates are caused by the removal of the outermost layer, most likely due to thermally induced mechanical stresses such as buckling. Several phenomena imply that a surface plasma causes the delamination damage morphology.

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