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Design and Use of a Novel Apparatus for Measuring Capsule Fill Hole Conductance

Richard M. Seugling, Walter W. Nederbragt, Jeffery L. Klingmann, Stanley L. Edson, Jack L. Reynolds, Robert C. Cook

Fusion Science and Technology / Volume 51 / Number 4 / May 2007 / Pages 539-543

Technical Paper /

Description and results of a novel apparatus for determining the flow conductance through a laser drilled hole in a spherical shell for inertial confinement fusion experiments are described. The instrument monitors the pressure of an enclosed volume containing the laser drilled capsule as air bleeds through the hole into the shell. From these measurements one obtains the conductance of the fill hole. This system has proven to be a valuable tool for verifying the conductance into the capsule in a timely and nondestructive manner.

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