A Review of Bigfoot Implosion Data at the National Ignition Facility
Abstract
We consider the motivations for the high-velocity/high-adiabat approach to indirect drive known as ``Bigfoot,'' and review experiments from 2015 to 2018. We show that performance is a function of symmetry, as expected, and that layered data follows near-1-D scaling(s) for hot-spot pressure and capsule radius. While the design was not intended to achieve high performance, it also reaches high pressure (360 Gbar), yield (2.0 ×1016) , alpha heating (3.2×), and fusion gain <m:mfenced close="]" open="[" separators=""> 1 . 2 × <m:mfenced close=")" open="("> Y</m:mfenced><m:mfenced close="" open="/"><m:mphantom><m:mpadded width="0pt"><m:mfenced close=")" open="("> Y</m:mfenced><m:mfenced close=")" open="(" separators=""> 3<m:mfenced close="" open="/"><m:mphantom><m:mpadded width="0pt"> 3 2 pV </m:mpadded></m:mphantom></m:mfenced> 2 pV </m:mfenced></m:mpadded></m:mphantom></m:mfenced> <m:mfenced close=")" open="(" separators=""> 3<m:mfenced close="" open="/"><m:mphantom><m:mpadded width="0pt"> 3 2 pV </m:mpadded></m:mphantom></m:mfenced> 2 pV </m:mfenced> </m:mfenced> , at a compression ratio similar to data at a lower-design adiabat (1.5 to 2.5). We use these results to extrapolate in energy and scale, and suggest experiments that could explain current performance (limits).
This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DEAC52-07NA27344 and is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-NA0003856.- Publication:
-
APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- 2019
- Bibcode:
- 2019APS..DPPYO6008T