BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Ultrafast imaging of relativistic instabilities in solid-density p lasmas DTSTART:20250218T113000Z DTEND:20250218T130000Z DTSTAMP:20260811T094505Z UID:0f36e519-dd1b-48a8-96f0-7b75cf399ee1 SEQUENCE:2 CREATED:20250213T112210Z DESCRIPTION:The streaming of relativistic charged particles gives rise to kinetic instabilities that magnetize astrophysical and laboratory p lasmas. These (collective) fields impact plasma dynamics and their study is critical to a wide range of systems\, from cosmic-ray transport in ga laxies to the solar wind to fusion plasmas. Despite their importance\, the direct experimental characterization of these instabilities has re mained a challenge. I will discuss the results from experiments combi ning a high-intensity optical laser with a high peak-brightness X-ray las er at LCLS that successfully imaged relativistic kinetic instabilities  in solid-density plasmas with an unprecedented spatial and temporal r esolution of 200 nm and 50 fs. The measured plasma density evolution\, together with supporting theoretical analysis and kinetic simulations\,  reveal a unique interplay between space-charge\, resistive effects an d ion dynamics on the development of the instabilities. These findings  further indicate that magnetic fields on the order of 1000 Tesla are produced\, which help confine high-energy electrons with important implic ations for the transport of energetic particles in plasmas. LAST-MODIFIED:20250213T112231Z LOCATION:Anfiteatro PA2 (Piso -1 do Pavilhão de Matemática) do IST URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/ultrafast-imaging-of-relat ivistic-instabilities-in-solid-density-plasmas/ X-ALT-DESC;FMTTYPE=text/html:

The streaming of r elativistic charged particles gives rise to kinetic instabilities that  magnetize astrophysical and laboratory plasmas. These (collective) fie lds impact plasma dynamics and their study is critical to a wide range of  systems\, from cosmic-ray transport in galaxies to the solar wind to fus ion plasmas.

 Despite their importance\, the direct experime ntal characterization of these instabilities has remained a challenge.  I will discuss the results from experiments combining a high-intensit y optical laser with a high peak-brightness X-ray laser at LCLS that su ccessfully imaged relativistic kinetic instabilities in solid-density p lasmas with an unprecedented spatial and temporal resolution of 200 nm  and 50 fs.

The measured plasma density evolution\, together  with supporting theoretical analysis and kinetic simulations\, reveal a unique interplay between space-charge\, resistive effects and ion dyna mics on the development of the instabilities. These findings further  indicate that magnetic fields on the order of 1000 Tesla are produced\, which help confine high-energy electrons with important implications for the transport of energetic particles in plasmas.

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