The National Ignition Facility, or NIF, is a laser-based inertial confinement fusion (ICF) research device under construction at the Lawrence Livermore National Laboratory, in Livermore, California, United States. NIF uses powerful lasers to heat and compress a small amount of hydrogen fuel to the point where nuclear fusion reactions take place. NIF is the largest and most energetic ICF device built to date, and the first that is expected to reach the long-sought goal of "ignition", where the fusion reactions become self-sustaining.