In laser driven inertial confinement fusion research, velocity interferometer system for any reflector is the key diagnosis of shock wave velocity history during multi-shock loading. Two-axis VISAR developed from VISAR is an important technology for target driving symmetry diagnosis, which is capable of continuous diagnosis of driving symmetry in multiple directions of the target. In small laser facilities, fusion studies are usually carried out with small-diameter target pellets in order to obtain higher driving pressures. So, it is necessary to develop two-axis VISAR which can be used in small-diameter target. Smaller diameter target brings more challenges in physical design, target design, target calibration, diagnosis, and experimental implementation. This report mainly focuses on the technical challenges in the exploration of two-axis VISAR diagnostic technology, which are overcome by joint optimization methods include fine-structure micro-target preparation, imaging simulation of keyhole target, imaging and interference technology of large-curvature reflective, etc. Finally, We developed diagnostic technology of shockwave loading symmetry which is applied in shockwave tuning experiments.
 

shockwave,velocity,VISAR,symmetry tuning