A New Layering for Indirect Drive IFE Targets Progress report for the periods August 15, 2000 through December 14, 2001 Page: 3 of 35
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A NEW LAYERING METHODS FOR INDIRECT DRIVE IFE TARGETS
Year 1 Progress Report
April 15, 2001
Principal Investigator: D.T. Goodin
Other Participants: M. Tillack, J. Pulsifer, R.W. Petzoldt, C. Gibson, G. Besenbruch
General Atomics
ABSTRACT
Layering is the process whereby condensed deuterium tritium (DT) fusion fuel at 18-19 K is
very uniformly distributed on the inside wall of an Inertial Fusion Energy (IFE) target. The
quality and uniformity of the DT layer has a profound effect on the performance (gain) of the
target. It would be a great advantage for indirect drive targets to carry out layering with the
capsule already assembled in the hohlraum. One concept to accomplish this is to layer targets in
controlled temperature, cryogenic tubes while they are being staged for feeding to the injection
system.
In this report we have demonstrated through extensive analysis that in-hohlraum layering is
possible, but that variations in dimensions, alignments and material properties can easily cause
the capsule temperature nonuniformity to exceed values needed to assure proper fuel layering.
The concept shows sufficient promise to warrant continued investigation. Analysis alone cannot
demonstrate the feasibility of in-hohlraum layering. One of the most basic and important
experiments is the measurement of the properties of hohlraum materials. Such measurements
must be performed with sufficient accuracy to demonstrate predictability and repeatability to the
level of precision needed to maintain thermal control. Continued close interaction between target
designers and target fabricators is needed to ensure development of a cost-effective target designGeneral Atomics Report GA-C23890 iii
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A New Layering for Indirect Drive IFE Targets Progress report for the periods August 15, 2000 through December 14, 2001, report, December 2001; United States. (https://digital.library.unt.edu/ark:/67531/metadc737351/m1/3/: accessed April 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.