Att studera och kontrollera strukturen hos plasmadynamiken i Röntgenlaserexperiment

Tidsperiod: 2013-01-01 till 2016-12-31

Projektledare: Jakob Andreasson

Finansiär: Vetenskapsrådet

Bidragstyp: Projektbidrag

Budget: 9 000 000 SEK

X-ray Free Electron lasers push the frontier of science with their extremely short and brilliant pulses. The high X-ray intensities allow new ways to image single bio-particles in their native environment (the dream of structural biology) and can create unexplored states of matter. Any sample hit by a laser pulse rapidly turns into a highly excited plasma. We plan to study the ionization and fragmentation dynamics of nano- to micrometer sized objects in a focused X-ray pulse. This will allow us to understand the atomic and electronic processes that govern the interactions at these high field strengths and develop strategies to control the damage induced on the sample during the exposure. We aim to refine the techniques for delivering biological samples into the interaction region in vacuum, to control the thickness of their protective water layer and to manipulate individual droplets towards the region where they will be probed. We will develop time-resolved spectroscopy methods (THz/X-ray pump-probe) to investigate the time scales of nanoplasma formation and dynamics. Our ion, electron and plasma spectroscopy in a pump- probe setup would work simultaneously with the coherent diffractive imaging of the sample particles. This will provide a better understanding of the ionization dynamics at the extreme intensities, and could reveal emerging novel physics phenomena when even higher intensities are reached in the future.