In inertial confinement fusion, the laser plasma instabilities and the asymmetry of target implosion are major obstacles to achieving high gain in the laboratory. Novel hohlraums with multi laser-entrance-holes (LEHs) are proposed to solve the critical issues. To enable the study of the novel hohlraums, new experimental platforms and the quasi-3D simulation model are developed using all the laser beams of the laser facility that is primarily designed for the cylindrical hohlraum. The implosion experiments for a six-cylinder-port hohlraum were performed at the Shenguang 100 kJ Laser Facility, producing a peak hohlraum radiation temperature from ~220 eV to ~250 eV, a DD neutron yield from ~10⁹ to ~5.6×10¹⁰. The inferred x-ray conversion efficiency is similar to the cylindrical hohlraum, while the low laser backscatter is similar to the outer cone of the cylindrical hohlraum. The hohlraum radiation temperature and M-band flux can be well reproduced by the quasi-3D simulation. The sensibilities and control strategies of mode-2 and mode-4 asymmetry with different initial parameters were also investigated. The variations of the the hot spot shape and the yield-over-clean (YOC) can be semi-quantitatively explained by the calculated major radiation asymmetry of the quasi-3D simulation. Our work demonstrates the capability for the study of the indirect drive with the six-cylinder-port hohlraum at the cylindrically configured laser facility, which is essential for assessing the performances of the novel hohlraum at ignition-scale.
 

implosion experiments, asymmetry, six-cylinder-port hohlraum