A metallic case called a hohlraum holds the fuel capsule for NIF experiments. Target handling systems precisely position the target and freeze it to cryogenic temperatures (18 kelvins, or -427 degrees Fahrenheit) so that a fusion reaction is more easily achieved.
Credit: E. Dewald/LLNL
Source: NIF experiments show initial gain in fusion fuel (Lawrence Livermore National Laboratory)
H/T to joebardo for pointing me this news, albeit as he says, I already knew the story, only that I’m not too optimistic about the future of this experiment (at least not as an energy source). My bets are on the International Thermonuclear Experimental Reactor (ITER). In other words, I tend to see more reliable Magnetic confinement fusion than Inertial confinement fusion, and possibly we are still far (decades) of both of them.