On May 29 Lawrence Livermore National Laboratory dedicated the National Ignition Facility, the world’s biggest laser system. It will direct laser beams from all directions onto a pencil-eraser-size pellet of frozen hydrogen (housed in a tube called a hohlraum), heating it to millions of degrees and inducing fusion. The laser beams must travel some distance to pick up energy from amplifiers and hit its tiny target; the lab likens the accuracy to a pitcher at AT&T Park in San Francisco throwing a strike at Dodger Stadium in Los Angeles. Designed to ensure that U.S. nuclear warheads work properly in lieu of actual testing, the facility will also provide a means to study the interior of stars and fusion as an energy source.
Number of laser beams that hit the target: 192
Number of “control points” to amplify and maintain the beams: 60,000
Laser travel distance: 1 kilometer
Time in which all beams must strike target, in trillionths of a second: 30
Energy delivered to target, in joules: 1.8 million
Initial cost estimate: $1.1 billion
Actual final cost: $3.5 billion
Initial construction time estimate: 6 years
Actual construction time: 12 years
Number of laser beams that hit the target: 192
Number of “control points” to amplify and maintain the beams: 60,000
Laser travel distance: 1 kilometer
Time in which all beams must strike target, in trillionths of a second: 30
Energy delivered to target, in joules: 1.8 million
Initial cost estimate: $1.1 billion
Actual final cost: $3.5 billion
Initial construction time estimate: 6 years
Actual construction time: 12 years
