The National Ignition Facility (NIF) at Lawrence Livermore National Laboratory recently produced 10,400 Joules or 10.4 kiloJoules (kJ) of ultraviolet laser light in a single laser beamline, setting a world record for laser performance. In recent weeks NIF laser scientists also have used the first four NIF beamlines to set records for infrared and green single beam laser energies with 21 kJ and 11 kJ of energy delivered, respectively. NIF researchers focused this light into a special diagnostic system designed to provide precise measurements of laser beam quality and performance at these different frequencies.
From DOE/Lawrence Livermore National Laboratory :NIF project sets records for laser performance
LIVERMORE, Calif. — The National Ignition Facility (NIF) at Lawrence Livermore National Laboratory recently produced 10,400 Joules or 10.4 kiloJoules (kJ) of ultraviolet laser light in a single laser beamline, setting a world record for laser performance.
In recent weeks NIF laser scientists also have used the first four NIF beamlines to set records for infrared and green single beam laser energies with 21 kJ and 11 kJ of energy delivered, respectively. NIF researchers focused this light into a special diagnostic system designed to provide precise measurements of laser beam quality and performance at these different frequencies.
The NIF laser system has now demonstrated ultraviolet laser energy equivalent to 2 million Joules (MJ) in 192 beams. This “full NIF equivalent” performance exceeds the design requirement of 1.8 MJ specified for NIF.
“The NIF project has demonstrated excellent management and technical performance under very demanding circumstances. NIF continues surpassing expectations and is now breaking world records. It is well on its way to becoming one of the jewels of NNSA and the nuclear weapons complex,” said Linton Brooks, administrator of the National Nuclear Security Administration (NNSA) said.
NIF Associate Director George Miller agreed, saying, “We have met or exceeded all current required milestones in the baseline established three years ago. We have now demonstrated on a per-beam basis the critical performance criteria of NIF. These accomplishments show that NIF is ready to fulfill the promise of its vital role in maintaining the viability of the U.S. nuclear deterrent through the Stockpile Stewardship Program.”
NIF’s football stadium-sized building will house 192 laser beams delivering ultraviolet laser light to millimeter-sized targets. The tremendous energy available in NIF can be used to produce conditions of extreme temperature and pressure, similar to those that occur in stars and in exploding nuclear weapons.
NIF also will be used to achieve inertial confinement fusion ignition with energy gain, which will provide researchers with a better understanding of the processes that occur in nuclear weapons and will provide valuable data for future fusion energy power production.
When fully activated, NIF will provide 50 times more energy than any other laser system and will be a cornerstone of the NNSA’s Stockpile Stewardship Program.
In the process of achieving this milestone, the NIF research team has met or exceeded a number of critical performance criteria including:
Demonstration of 0.2 to 25 nanosecond shaped pulses. Less than five hours between shots (providing capability for more than 700 laser shots per year.) Better than required beam uniformity. Beam relative timing to 6 picoseconds (trillionths of a second.)
The achievement of this milestone and demonstration of NIF performance criteria continue a string of successes that have taken place in the past six months. The successful completion of this activity required the efforts of hundreds of workers in disciplines ranging from construction to precision optics. In the process, all of the major systems required to demonstrate the operation of NIF were installed, activated and commissioned to NIF specifications.
In the coming year NIF personnel will use these first laser beams to characterize NIF’s performance and begin basic and applied science experiments. Experiments are planned to begin on NIF starting this year and will continue while the project is completed. Experimental capabilities will grow as additional laser beams are activated, culminating in the completion of all 192 laser beams in 2008.
