Microscopic dynamics of warm dense matter

Completed

Nuclear Fission and Fusion(Nuclear Fusion)
Not Energy Related

Basic and strategic applied research

PHYSICAL SCIENCES AND MATHEMATICS (Physics)

Not Cross-cutting

Dr D Riley
Mathematics & Physics
Queen's University Belfast

Standard

EPSRC

12 January 2009

11 November 2012

46 months

£467,881

Plasma physics

Northern Ireland

Physical Sciences

Dr D Riley, Mathematics & Physics, Queen's University Belfast

Professor LS Lewis, Mathematics & Physics, Queen's University Belfast

Linked to grant EP/G007187/1

In this proposal we seek to explore fundamental issues of dense plasmas and warm dense matter. These states of matter are important as they occur in the natural world, for example, in the cores of large planets and brown dwarfs as well as in laser-fusion pellets and solids heated to plasma temperatures during laser ablation.There are many fundamental questions to be answered and theoretical modelling is difficult because strong coupling makes classical plasma treatments unsuitable and the temperatures are too high to make the ground state approximations of condensed matter. As a result there is much uncertaintly about the equation of state under many relevant conditions. In fact, apparently equally vaild theoretical approaches can easily differ by more than 50% in the predicted pressurefor a given temperature and density. Some fundamental questions we wish to address are:'Is there really a plasma phase transition i.e., a flipping over from a low to high ionisation state ashas been predicted by theory and can we observe it?''In experiments, how fast do the electrons and ion equilibrate when one species is preferentially heated by shocks or x-rays?''What effect does unequal ion and electron temperatures have on the structrure factors?''How does the microscopic spatial and temporal structure of the plasma evolve and can we moniotor it in careful experiments?'One of the key diagnostics will be x-ray scattering, both spectrally and angularly resolved to access respectively the temporal and spatial structure of the dense plasmas. The PI's have played leading roles in the development of these diagnostics. Other diagnostics that will be used to validate experiments are shock and particle speed measurements using techniques such as VISAR and streaked optical emission measurements.The experimental program will make use not only of the Central Laser Facility, but we will continue to access major international laser facilities such as LULI (Paris), TITAN (Livermore) and,the free electron laser facilities (FLASH and LCLS X-FEL).The experimental program will be backed up by a rigorous theoretical effort involving experienced plasma scientists at the Univ. Rostock as collaborators

22/08/08