Next generation application of EUV lasers

Lead Research Organisation: University of York
Department Name: Physics


Accurate quantitative opacities relevant to the boundary between the convection and radiative zone of the Sun and other similar plasmas using a novel EUV laser probing technique will be made. To produce quantitative opacity measurements that can be used to improve the precision of the Rosseland mean opacity employed in the Standard Solar Model, we need to implement advances in experimental technique and increase the plasma density and temperature uniformity and range of measurement alongside a major modelling and simulation effort on plasma opacity. The positions of spectral lines and their oscillator strengths are tabulated by databases such as the Opacity Project. Our measurements will enable comparisons between theory and experiment to check the systematic absolute accuracy of the spectral line wavelengths (to within +/- 0.02 nm) and the accuracy of spectral line broadening models at high density (again to within +/- 0.02 nm). The measurement of laser ablation using EUV laser probing under different ablation regimes including with x-ray heating will be explored and the production of plasmas directly by focussed EUV irradiation will be investigated.
Description The grant funded a PhD student to work on extreme ultra-violet (EUV) laser probing of the opacity of plasma material. The student spent a secondment period at the Central Laser Facility and subsequently was employed by the Atomic Weapons Establishment (AWE) to investigate opacity issues using the Orion laser facility.
Exploitation Route The work has benefited AWE. The student Lauren Hobbs (nee Gartside) has been involved in one of the principal investigations of the Orion laser project: the measurement of plasma opacity at high density and temperature using buried layer targets heated by short pulse lasers.
Sectors Aerospace, Defence and Marine

Description AWE
Amount £70,000 (GBP)
Funding ID R13132 
Organisation Atomic Weapons Establishment 
Sector Private
Country United Kingdom