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LULI2000 - Dynamics of statrs death and birth: from the cosmos to the laboratory (G. Gregori)

The physics of supernova remnants (SNRs), which results of the interaction between the supernova ejecta and the ambient medium, is fundamental in the structure and the dynamics of ISM and also in the high-­‐energy astrophysics. When two isolate massive stars are relatively closed and exploded, the resulting SNRs can interact and lead to a more complex structure of the ISM. The impact zone presents a fascinating complex hydrodynamic physics which depends on the age of SNR and its relative evolution stage and the relative position of the two stars. In this proposal, we will study the processes involved in this astrophysics situation by generating two strong blast waves in the laboratory and measure all possible variables involved in their mutual interaction in a first phase, with a spherical object in a second phase. To this end, two beams of the LULI2000 focalised on small multilayer foils, located a part from the central axis of the chamber, will produce the blast waves that will propagate in a low Z gas and interact on the axis. Various optical diagnostics will be implemented to access to the waves variables (velocity, density, temperature, …) and proton radiography to infer possible B-­‐field generation when the two blast waves interpenetrate each other. When going to the second phase (interaction with a spherical objects), a new x-­‐ray diagnostic will be used (LiF detector technique) to observe the collapse of the sphere positioned on the target chamber axis. By changing the backlighter beam delay from shot to shot we will be able to follow the dynamic of this phenomenon. 2D& 3D simulations using the FLASH code will be performed both for the design of the all experiment and also the interpretation of the results.

LULI2000 - S3-5 / 2018