Inertial Fusion Energy with "Isochoric" Fast Ignition requires a smaller driver than standard "isobaric" ICF
Much of the science and technology for fast-ignition research was originally developed in the U.S. This culminated with the Nova Petawatt that has since been closed. Many countries have or are developing comparable systems for studying fast ignition.
Neutron yield versus heating pulse power from the integrated experiments of Kodama et al. at ILE-OSAKA.