Measurement of preheat due to nonlocal electron transport in warm dense matter

0501414 - FZÚ 2019 RIV US eng J - Článek v odborném periodiku
Falk, Kateřina - Holec, M. - Fontes, C.J. - Fryer, C.L. - Greeff, C.W. - Johns, H.M. - Montgomery, D. S. - Schmidt, D.W. - Šmíd, Michal
Measurement of preheat due to nonlocal electron transport in warm dense matter.
Physical Review Letters. Roč. 120, č. 2 (2018), s. 1-5, č. článku 025002. ISSN 0031-9007. E-ISSN 1079-7114
Institucionální podpora: RVO:68378271
Klíčová slova: inertial confinement fusion * scattering * plasmas * temperature * performance * implosion * ignition * system * beams * gain
Obor OECD: Fluids and plasma physics (including surface physics)
Impakt faktor: 9.227, rok: 2018

This Letter presents a novel approach to study electron transport in warm dense matter. It also includes the first x-ray Thomson scattering (XRTS) measurement from low-density CH foams compressed by a strong laser-driven shock at the OMEGA laser facility. The XRTS measurement is combined with velocity interferometry (VISAR) and optical pyrometry (SOP) providing a robust measurement of thermodynamic conditions in the shock. Evidence of significant preheat contributing to elevated temperatures reaching 17.5-35 eV in shocked CH foam is measured by XRTS. These measurements are complemented by abnormally high shock velocities observed by VISAR and early emission seen by SOP. These results are compared to radiation hydrodynamics simulations that include first-principles treatment of nonlocal electron transport in warm dense matter with excellent agreement. Additional simulations confirm that the x-ray contribution to this preheat is negligible.
Trvalý link: http://hdl.handle.net/11104/0293451