Silicon x-ray backlighter improvement by targets with spike-like microstructures

Ebert, Tina; Sander, Steffen; Stoeckl, Christian; Theobald, Wolfgang; Regan, Sean P.; Roth, Markus

doi:10.1063/5.0164471

Title: Silicon x-ray backlighter improvement by targets with spike-like microstructures

Journal Article · 08 March 2024 · AIP Advances

DOI: https://doi.org/10.1063/5.0164471 · OSTI ID:2338046

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Technical University of Darmstadt (Germany); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Technical University of Darmstadt (Germany)
Laboratory for Laser Energetics 3 , Rochester, NY (United States)

In order to accurately probe high energy density matter states, it is vital to create powerful x-ray backlighters. One approach to create such x-ray sources is based on the usage of short-pulse, high-energy lasers, which greatly benefits from an optimization of the laser target coupling. Here, the spectral and temporal x-ray emission profiles of structured silicon targets with micron-sized spikes on the front surface are studied at laser intensities of 10¹⁷ W cm^-2. The laser pulse length is varied between 1 and 20 ps with an energy of up to 1 kJ. The structured targets show an up to 13× enhancement of silicon He_α emission compared to flat foils with a well-defined, sharp emission pulse profile. Furthermore, the performance of the microstructured targets is compared to targets with a CH shield as well as foils irradiated with a UV prepulse.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); New York State Energy Research and Development Authority; German Research Foundation (DFG); Darmstadt Graduate School of Excellence Energy Science and Engineering; German Federal Ministry of Education and Research (BMBF); Hessian Ministry for Science and the Arts (HMWK); University of Rochester

Grant/Contract Number:: AC52-07NA27344; NA0003856; GSC 1070; 05P19RDFA1

OSTI ID:: 2338046

Report Number(s):: LLNL-JRNL-845194; 1068121; TRN: US2410413

Journal Information:: AIP Advances, Vol. 14, Issue 3; ISSN 2158-3226

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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