NASA’s New Shortcut to Fusion Power
"One promising alternative is lattice confinement fusion (LCF), a type of fusion in which
the nuclear fuel is bound in a metal lattice. The confinement encourages positively
charged nuclei to fuse because the high electron density of the conductive metal reduces
the likelihood that two nuclei will repel each other as they get closer together."
See:
https://spectrum.ieee.org/lattice-confinement-fusion