Hot-spot mix in large-scale HDC implosions at NIF

Mix of high-Z material from the capsule into the fuel can severely degrade the performance of inertial fusion implosions. On the Hybrid B campaign, testing the largest high-density-carbon capsules yet fielded at the National Ignition Facility, several shots show signatures of high levels of hot-spot...

Full description

Saved in:
Bibliographic Details
Published in:Physics of plasmas 2020-09, Vol.27 (9)
Main Authors: Zylstra, A. B., Casey, D. T., Kritcher, A., Pickworth, L., Bachmann, B., Baker, K., Biener, J., Braun, T., Clark, D., Geppert-Kleinrath, V., Hohenberger, M., Kong, C., Le Pape, S., Nikroo, A., Rice, N., Rubery, M., Stadermann, M., Strozzi, D., Thomas, C., Volegov, P., Weber, C., Wild, C., Wilde, C., Callahan, D. A., Hurricane, O. A.
Format: Article
Language:English
Subjects:
Diamonds
Growth factors
Implosions
Inertial fusion (reactor)
Performance degradation
Plasma physics
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Mix of high-Z material from the capsule into the fuel can severely degrade the performance of inertial fusion implosions. On the Hybrid B campaign, testing the largest high-density-carbon capsules yet fielded at the National Ignition Facility, several shots show signatures of high levels of hot-spot mix. We attribute a ∼ 40 % yield degradation on these shots to the hot-spot mix, comparable to the level of degradation from large P2 asymmetries observed on some shots. A range of instability growth factors and diamond crystallinity were tested and they do not determine the level of mix for these implosions, which is instead set by the capsule quality.
ISSN:1070-664X
1089-7674
DOI:10.1063/5.0003779