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It appears that D-GDPnormal shells sag during pyrolysis and stick to the container resulting in these features. These features often appear in the AFM traces of such shells (Fig. 3–24), leading to very poor power spectra. , “Recent Progress in Fabrication of High-Strength Glow Discharge Polymer Shells by Optimization of Coating Parameters,” to be published in Fusion Science and Technology. General Atomics Report GA–A23852 3–21 FY01 ICF Annual Report Project Staff D-GDPstrong shells have much smoother AFM traces.

3–47. Glass shells made by the Si-GDP process (the ameters and wall thicknesses we can green data points) cover a much broader diameter and wall make (Fig. 3–47). The previous, thickness range than glass shells made by the drop tower technique the traditional drop tower process (blue). 11 However, new and more powerful drivers, including NIF and Z, extended the range of shell sizes need for the ICF program. We are now delivering glass shells beyond the range available by the older method. In one case, we used the method to make much larger glass shells required for DT layering experiments at LLNL.

Shell 1 has nonuniform wall thickness; the bull’s-eye pattern of interference rings is not concentric to the shell. Shell 2 is acceptable; the interference rings are concentric. In the example order above, to achieve the correct thickness of the inner GDP layer, the GDP coating run must be monitored by interrupting it at appropriate times for layer measurement. Coating thicknesses are measured by interferometry using a GA designed z-translation laser stage (Fig. 3–43). To insure the correct dopant concentration of the Ti–GDP second layer, trial coating runs are performed.

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