15-19 April 2018
Paradise Point Resort & Spa
America/Los_Angeles timezone

12.32 Soft X-ray backlighter source driven by a short-pulse laser for pump-probe characterization of warm dense matter

18 Apr 2018, 20:30
2h 1m
Paradise Point Resort & Spa

Paradise Point Resort & Spa

1404 Vacation Rd, San Diego, CA 92109

Speakers

Chris McGuffey (Univ of California - San Diego) Joohwan Kim (Univ of California - San Diego) Maylis Dozieres (Univ of California - San Diego) Jaebum Park (Lawrence Livermore National Laboratory) Jim Emig (Lawrence Livermore National Laboratory)

Description

Matter in the warm, dense regime (T~1-100 eV; ρ~0.01-10 g/cc) is often challenging to diagnose on the timescales of its evolution. For example, matter isochorically heated by a sub-picosecond laser or laser-driven proton beam can rise in temperature by 100 eV over a timescale of ps to 10s of ps, motivating development of sub-ps time-resolved measurement techniques. Here we describe a pump-probe X-ray absorption spectroscopy temperature measurement technique. It is shown using atomic modeling simulations that the energy and optical depth of bound-bound and bound-free transitions in various low-Z materials are highly sensitive to temperature in the range of 10 to >100 eV. A backlighter source suitable for the technique was developed using a range of laser parameters with pulse duration ≤5 ps and various pure and alloyed materials.This work was performed under the auspices of the Department of Energy through the Fusion Energy Sciences HEDLP program under grant award number DE-SC0014600.

Primary author

Chris McGuffey (Univ of California - San Diego)

Co-authors

Joohwan Kim (Univ of California - San Diego) Maylis Dozieres (Univ of California - San Diego) Jaebum Park (Lawrence Livermore National Laboratory) Jim Emig (Lawrence Livermore National Laboratory)

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