Characterization of plasma filling in hohlraum using X-ray framing camera

A microchannel plate gated X-ray framing camera(XFC) was used to take pictures of Au plasma radial convergence in hohlraums on Shenguang-II laser facility. According to XFC image manipulation by MATLAB and measurement of radiation temperature, hohlraum closure of Au plasma generally will not occur in hohlraums with sizes of φ1000 μm x 1800 μm and φ1200 μm x 2100 μm, on condition that there is no gas and low-Z filling in hohlraum, by laser beams with 351 nm wavelength, 2.4 ns pulse duration and 8 x 300 J energy on Shenguang-II laser facility. While obvious hohlraum closure of Au plasma would occur in the standard hohlraum(φ800 μm x 1350 μm) with the laser applied for about 1.5 ns. Additionally, XFC image manipulation unveiled Au plasma radial convergence speed in the three hohlraums, which shows that the bigger the hohlraum size and the longer the laser applying time, the lower the speed. (authors)