Publications by authors named "O Rosmej"
Article Synopsis
- Ionizing radiation can lead to significant damage in materials, but understanding this process, especially in nanostructures, has been challenging due to methodological limitations.
- This study utilized transient photoabsorption to examine the behavior of free electrons in bulk and nanostructured silica (aerogel) subjected to brief bursts of radiation from x rays and protons.
- Results indicate a notable increase in the lifetime of free electrons in aerogels, linked to a disruption in typical recovery processes, providing insights into how small-scale interactions can lead to observable effects in larger systems.
Article Synopsis
- - Direct laser acceleration (DLA) of electrons in near-critical density (NCD) plasmas is showing promise for high-energy laser applications, particularly in Inertial Confinement Fusion research.
- - Experiments at the PHELIX sub-PW laser revealed efficient and highly directed betatron radiation from DLA electrons, producing around (3.4 ± 0.4)·10 photons per keV per sr at 10 keV photon energy.
- - The results align well with particle-in-cell simulations, indicating that using low-density pre-ionized foams could lead to innovative advancements in high energy density research.
In this work, the first proof of the principal of an in situ diagnostics of the heavy-ion beam intensity distribution in irradiation of solid targets is proposed. In this scheme, x-ray fluorescence that occurs in the interaction of heavy-ions with target atoms is used for imaging purposes. The x-ray conversion to optical radiation and a transport-system was developed, and its first test was performed in experiments at the Universal Linear Accelerator in Darmstadt, Germany.
View Article and Find Full Text PDFUltra-intense MeV photon and neutron beams are indispensable tools in many research fields such as nuclear, atomic and material science as well as in medical and biophysical applications. For applications in laboratory nuclear astrophysics, neutron fluxes in excess of 10 n/(cm s) are required. Such ultra-high fluxes are unattainable with existing conventional reactor- and accelerator-based facilities.
View Article and Find Full Text PDFIn a recent experimental campaign, we used laser-accelerated relativistic hot electrons to ensure heating of thin titanium wire targets up to a warm dense matter (WDM) state [EPL114, 45002 (2016)10.1209/0295-5075/114/45002]. The WDM temperature profiles along several hundred microns of the wire were inferred by using spatially resolved X-ray emission spectroscopy looking at the Ti K characteristic lines.
View Article and Find Full Text PDF