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Researchers measure field strength and density of ICF implosions
February 29, 2008LIVERMORE, Calif. - Scientists have identified for the first time two distinctly different types of electromagnetic configurations in inertial confinement fusion implosions that have substantial effects on implosion dynamics and diagnosis.
In the most recent research, which appears in the Feb. 29 issue of the journal, Science, Ryan Rygg of Lawrence Livermore National Laboratory and colleagues from the Massachusetts Institute of Technology and the University of Rochester used radiography with a pulsed monoenergetic proton source to simultaneously measure field strength and area densities by looking at the energy lost by protons during the implosion.
Inertial confinement fusion (ICF) is a process where nuclear fusion reactions (which release copious amounts of energy) are initiated by heating and compressing a fuel target, typically in the form of a spherical shell containing a mixture of deuterium and tritium. Upon completion of the National Ignition Facility laser, fuel will be compressed a thousand-fold by rapid energy deposition onto the surface of a fuel target.
At the OMEGA laser in Rochester, the team blasted 36 laser beams that deposited 14 kilojoules of energy in a one nano-second pulse into ICF fast-ignition capsules. (A nanosecond is one billionth of a second). To observe the dynamics of the imploding capsules, Rygg radiographed the targets before and during implosion. Radiography typically uses X-rays to view unseen or hard-to-image objects, but radiography using protons is sensitive to different phenomena.
The radiographic images showed the presence of complex, filamentary magnetic fields, which permeate the field of view, while a coherent centrally directed electric field is seen near the capsule shell, which had imploded to half its initial radius.
"By measuring the evolution of this coherent electric field, we could potentially map capsule pressure dynamics throughout the implosion, which would be invaluable in assessing implosion performance," Rygg said. "The striated fields may provide a snapshot of structures originally produced inside the critical surface at various times during the implosion, which would open the door for evaluating the entire implosion process."
DOE/Lawrence Livermore National Laboratory
At the OMEGA laser in Rochester, the team blasted 36 laser beams that deposited 14 kilojoules of energy in a one nano-second pulse into ICF fast-ignition capsules. (A nanosecond is one billionth of a second). To observe the dynamics of the imploding capsules, Rygg radiographed the targets before and during implosion. Radiography typically uses X-rays to view unseen or hard-to-image objects, but radiography using protons is sensitive to different phenomena.
The radiographic images showed the presence of complex, filamentary magnetic fields, which permeate the field of view, while a coherent centrally directed electric field is seen near the capsule shell, which had imploded to half its initial radius.
"By measuring the evolution of this coherent electric field, we could potentially map capsule pressure dynamics throughout the implosion, which would be invaluable in assessing implosion performance," Rygg said. "The striated fields may provide a snapshot of structures originally produced inside the critical surface at various times during the implosion, which would open the door for evaluating the entire implosion process."
DOE/Lawrence Livermore National Laboratory
LANL Roadrunner models nonlinear physics of high-power lasers
For years scientists have struggled with the difficult physics of inertial confinement fusion. This is the attempt to compress a target capsule containing isotopes of hydrogen with high-powered lasers to high enough pressure and temperature to initiate fusion burn.
Science at the Petascale: Roadrunner Results Unveiled
The world's fastest supercomputer, Roadrunner, at Los Alamos National Laboratory has completed its initial "shakedown" phase doing accelerated petascale computer modeling and simulations of a variety of unclassified, fundamental science projects.
Rapid-fire pulse brings Sandia Z method closer to goal of high-yield fusion reactor
An electrical circuit that should carry enough power to produce the long-sought goal of controlled high-yield nuclear fusion and, equally important, do it every 10 seconds, has undergone extensive preliminary experiments and computer simulations at Sandia National Laboratories' Z machine facility.
Metal deformation studies lead to new understanding of materials at extreme conditions
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