Abstract
This analysis optimizes the amount of monatomic hydrogen produced by an arc-heated plasma torch against the thickness of the boundary layer above a substrate target in stagnation flow. Large amounts of monatomic hydrogen are believed to be ideal for diamond growth, and thinner boundary layers will permit more of the free-stream H to penetrate to the growing surface. A plateau-like optimum is found in the range 50%–80% hydrogen in the feedstock; this flat plateau indicates that process control can be made insensitive to composition. The optimum bulk temperature for a constant property boundary layer is found to be 4000 K, with the curve approaching this temperature being steepest around 3500 K. Since 3500 K is the typical bulk temperature achieved by arc-heaters, process control is particularly sensitive to the amount of power introduced into the gas stream. Finally, additional means of thinning the boundary layer further are discussed.
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