Ultrahigh Pressure Generation from Nanowire Irradiated with Relativistic Intensities Laser Pulse

by Jian Fuh Ong (ELI-NP)


The ultrahigh-pressure using laser-irradiated nanowire arrays was discussed in Ref. [1], resulting from nanoscale z-pinch [2]. There have been experiments and simulations on these topics by using a laser with intensities a0=10-34. The plasma pressure generated by the z-pinch is not only limited by the magnetic instabilities, but also the return current. Here, we demonstrate via three-dimensional particle-in-cell simulation (3D PIC), that there are other mechanisms that can generate pressure higher than z-pinch and suppresses the magnetic instabilities. We found that the plasma undergoes stable density modulation inside the laser field with a pressure of more than 10 Tbar when the plasma is relativistically transparent to the laser field (see FIG.1). These plasma layers have a separation of half laser wavelength and the modulation persist over the duration of the laser pulse. At these intensities, the influence of the magnetic instabilities and return current to the ultrahigh-pressure generation is no longer the bottleneck. The demonstration of pressure generation higher than the laser-induced z-pinch mechanism could substantially advance the physics of high pressure, especially high-power laser facilities that could provide such intense laser pulses that are currently available. These understandings open up a new perspective in the studies of micro-fusion, warm dense matter, and extending the equation of state research to the sub-terabar regime.