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PDF format (1293K)
A survey of four research projects shows how theory and modeling efforts by scientists in the Chemistry and Materials Science Directorate at LLNL are advancing our understanding of the property of materials with consideration of underlying structures. To account for radiation effects in some materials, we have created a hierarchy of simulation tools. Focusing on damage processes that occur when semiconductor devices are manufactured, we can now predict the distribution and growth of defects in silicon when dopant ions are implanted by a high-energy ion beam. Tantalum, a ductile metal with important defense applications, is the subject of another modeling project. Our recent model of deformation in tantalum uniquely accounts for its work-hardening behavior, and the same approach can potentially be applied to other types of commercially useful metals. In the area of energetic materials, we are simulating how a shock wave propagates through high explosives as a function of degradation, and we can predict how new explosives will perform under a variety of conditions. Finally, we have developed models that accurately mimic the complicated network and void structure of ultralow-density aerogels. Such models help us understand how molecules flow through aerogels and can facilitate the future use of these unconventional solids in applications that take advantage of their enormous surface area.
Livermore and DOE's Oakland Operations Office teamed up to decontaminate, decommission, and close out-on time and under budget-the Ann Arbor Inertial Confinement Fusion Facility in Michigan. To execute the project, the Laboratory formed a team of hazardous waste management experts, a health physicist, industrial hygienists, hazards control technicians, and former KMS Fusion employees who were familiar with the building's past experimental processes.The major goals of the cleanup effort were to identify and remove the tritium; analyze and dispose of thousands of containers of chemicals (some radioactive); decontaminate and dispose of equipment; decontaminate the building; remove any other contaminated items; and return the cleaned building to its commercial owner for unrestricted use. They developed a waste sampling and analysis plan; characterized legacy waste (in drums generated during the facility's operation) and process waste generated from this project's activities; and after certification, packaged the waste for storage at the Nevada Test Site and DOE's Hanford, Washington, complex.
and LLNL Disclaimers