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LULI2000 - Advanced x-ray diagnostics for highly nonlinear HED hydrodynamics instabilities experiments (A. Casner)

The main objective of this pluri-annual project (2017-2019) is to study the details of hydrodynamics instabilities and shocks in laser-generated plasmas, by developing dedicated novel techniques of x-ray imaging. According to the complexity of the experiments and novelty of diagnostics, a 3-years program is mandatory to fulfil these new developments. Last year in December 2016 on a preliminary campaign (2016-PS-F01-RIBEYRE), we have acquired the first ever Rayleigh-Taylor Instability data on LULI2000 with classical point-projection x-ray radiography. The first development tests of LiF based detectors were promising in the case of (undriven) targets, with spatial resolution δRS < 5 µm. In December 2017 (2017-PS-F01-CASNER), in Year 1 of this pluri-annual access, we plan to improve the complexity of the modulated targets yielding to more mixing at the decelerating interface . Based on complementary results acquired on SACLA XFEL facility by our collaborators, we expect that appropriate shielding of LiF based detectors will allow to acquire the first results in the case of driven targets. We will start to implement a Talbot-Lau (TL) interferometer developed by the Johns Hopkins group. This novel x-ray imager in HED physics could provide electron density gradients as well as additional simultaneous information such as attenuation, material composition (mixing diagnostic) and small-angle scatter. Within only a few shots in 2017, we will determine the optimal configuration on pico2000 (grating survival, Talbot order and magnification checks), in order to acquire images of static samples and perhaps driven samples. Therefore, in Year 2, our request is to benefit from 3 weeks of access because setting-up such imaging system is a challenging task in the middle of a 2 weeks run. Both the national and European context are very favourable to the development of x-ray micro-imaging platforms using for example the new UHI lasers such as Apollon, PETAL or the European XFEL in Hamburg as probe lasers. The proposed project has already attracted attention among the experts in the field of HED hydrodynamics at IFSA17. We really need a 3 weeks access to stay at the forefront of advanced x-rays diagnostics that will shed light on HED plasmas in the laboratory with unprecedented high spatial resolutions, enabling progress in the simulation and modelling of these complex regimes relevant for laboratory astrophysics.

LULI2000 - S40-42 / 2018