Experimental observation of elevated heating in dynamically compressed CH foam

0532148 - FZÚ 2021 RIV GB eng J - Journal Article
Falk, Kateřina - Fontes, C.J. - Fryer, C.L. - Greeff, C.W. - Holec, M. - Johns, H.M. - Montgomery, D. S. - Schmidt, D.W. - Šmíd, M.
Experimental observation of elevated heating in dynamically compressed CH foam.
Plasma Physics and Controlled Fusion. Roč. 62, č. 7 (2020), s. 1-10, č. článku 074001. ISSN 0741-3335. E-ISSN 1361-6587
Institutional support: RVO:68378271
Keywords : warm dense matter * heat transport * laser plasmas * dynamic compression * shock physics
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 2.458, year: 2020
Method of publishing: Open access

We present an experimental result of significantly increased heating in a laser-driven blastwave experiment carried out at the OMEGA laser facility. Abnormally high temperatures were observed in warm dense CH compared to older experiments and theoretical predictions. The higher temperatures in compressed CH were linked to an improved smoothness of the laser intensity profile, which resulted in better efficiency of the drive and coupling of more energy into the system compared to previous similar experiments. Fifteen beams with combined intensity of∼7×1014 W cm−2 and a square intensity profile with 2 ns duration were used to drive a strong shock, which subsequently developed to a blastwave travelling through low density CH foam creating warm dense matter. The experimental results were compared to hydrodynamic simulations and a potential contribution from x-rays to the elevated temperatures in the dense material was considered.

Permanent Link: http://hdl.handle.net/11104/0310743