Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3080655
Keywords
annealing; crystal defects; crystal growth; deuterium; dislocations; grain boundaries; plasma inertial confinement; plastic deformation; solidification; surface roughness; tritium
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Funding
- U.S. DOE [DE-AC52-07NA27344]
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We identify vapor-etched grain boundary grooves on the solid-vapor interface as the main source of surface roughness in the deuterium-tritium (D-T) fuel layers, which are solidified and then cooled. Current inertial confinement fusion target designs impose stringent limits to the cross-sectional area and total volume of these grooves. Formation of these grain boundaries occurs over time scales of hours as the dislocation network anneals and is inevitable in a plastically deformed material. Therefore, either cooling on a much shorter time scale or a technique that requires no cooling after solidification should be used to minimize the roughness.
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