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the Entire January/February 2002 Issue in PDF (10.8MB)
Fifty Years of Innovation through Nuclear Weapon Design
(pdf
file, 2.5MB)
Simulating Turbulence in Magnetic Fusion Plasmas
(pdf
file, 3.6MB)
A team of Lawrence Livermore scientists is leading a national effort
to simulate the extraordinarily complex physics involved in magnetically
confined plasmas. The teams focus is on deepening the understanding
of the plasma microturbulence that occurs inside a tokamak, a doughnut-shaped
magnetic confinement device. Microturbulence is an irregular, and unwanted,
fluctuation in the plasma soup of electrons and ions. The
fluctuations generate unstable waves and eddies that transport heat from
the superhot core across numerous magnetic field lines out to the tokamaks
walls. The collaborations current focus is on advanced codes, algorithms,
and data analysis and visualization tools. The simulations run on massively
parallel supercomputers, which use thousands of microprocessors in tandem.
The team has made important progress in the past few years, as seen in
the comparisons of simulations to experiment results, in the agreement
of results from codes developed by collaborators from different research
centers, and in the codes increasingly thorough and accurate physics
content.
Present at the Creation
(pdf
file, 2MB)
A collaboration
of Russian and Livermore scientists has added two new elements, 114 and
116, to the periodic table. It took 40 days of almost continuous effort
in 1998 to produce the first atom of element 114, which was a fusion of
plutonium-244 and calcium-48. Its lifetime was 30.4 seconds before decay
began. Daughter particles survived for a total of 34 minutes before the
final decay product fissioned. A subsequent experiment produced a single
atom of a different isotope of element 114. In 2000 and 2001, experiments
using calcium-48 and curium-248 resulted in a single atom of element 116.
Previously, Livermores collaboration with the Joint Institute for
Nuclear Research in Dubna, Russia, which began in 1989, produced new isotopes
of elements 106, 108, and 110. Upcoming experiments hope to result in
the new elements 113 and 115.
Rapid Field Detection of Biological Agents
(pdf
file, 1MB)
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