Science Alert August 16, 2022
For more than half a century, researchers around the world have been engaged in attempts to achieve fusion ignition as a proof of principle of various fusion concepts. Following the Lawson criterion, an ignited plasma is one where the fusion heating power is high enough to overcome all the physical processes that cool the fusion plasma, creating a positive thermodynamic feedback loop with rapidly increasing temperature. In inertially confined fusion, ignition is a state where the fusion plasma can begin “burn propagation” into surrounding cold fuel, enabling the possibility of high energy gain. While “scientific breakeven” (i.e., unity target gain) has not yet been achieved in this Letter an international team of researchers led by Los Alamos National Laboratory reports the first controlled fusion experiment, using laser indirect drive, on the National Ignition Facility to produce capsule gain (here 5.8) and reach ignition by nine different formulations of the Lawson criterion…read more. TECHNICAL ARTICLE
Cutaway characteristic target geometry (gold-lined depleted uranium hohlraum surrounding an HDC capsule) with some features labeled. … Credit: Phys. Rev. Lett. 129, 075001, 8 August 2022