Paulo Alves (SIMES Seminar)

Date(s) - Dec 12 2014
11:00 AM - 12:00 PM

Shasta Room, Bldg. 40, Room 361


Paulo Alves

Instituto Superior Tecnico, Lisbon, Portugal

 In silico microscopic plasma processes: from space to the lab

I will present an overview of recent theoretical and simulation work based on massively parallel particle-in-cell (PIC) simulations, that aim to address the complex cross-scale physical phenomena inherent to astrophysical and space plasma, and the possible routes for the amplification of the electromagnetic intensities required to reproduce these scenarios in the laboratory. I will first focus on the microscopic processes associated with the interaction between flows and small-scale magnetic obstacles, and discuss the conditions under which miniature magnetic collisionless shocks can form. I will then describe the rich variety of electron-scale instabilities connected with strong shear flow scenarios. These instabilities are efficient energy conversion mechanisms that can have a strong impact in magnetic field generation in astrophysical jets. In order to probe such systems in laboratory settings, I will discuss how to achieve high-quality amplified laser pulses via Brillouin-back-scattering in plasma, and identify the optimal parameter regime where parasitic instabilities are avoided. In an attempt to further push the boundaries on radiation amplification techniques, I will also discuss the possibility of combining plasmas with the electromagnetic flexibility of metamaterials, and focus on the unusual properties of stimulated Raman scattering in a plasma-metamaterial. Finally, I will conclude with possible experimental settings to explore these scenarios.Image for Alves seminar