Yang Libing

Initial Performance of the Primary Test Stand

The primary test stand (PTS) is a multiterawatt facility with a current of 8-10 MA and rise time of 90 ns, which is being built for Z-pinch studies at the Institute of Fluid Physics, China Academy of Engineering Physics. The PTS consists of 24 modules that are connected in parallel. Each module is based on the Marx generator and water pulse forming line as well as laser-triggered spark gap switch working at 5-MV level. The nominal total stored energy of the PTS is 7.2 MJ. All the Marx generators and laser-triggered spark gap switches had been tested at full voltage level before the PTS was assembled. The design and installation of the PTS are described. In this paper, the most recent results of the PTS commissioning will be introduced.

RT instability in cylindrical implosion of jelly ring

The interfacial RT instability experiments on imploding jelly liners in cylindrically convergent geometry have been performed. The liners instability growth was observed clearly with a high-speed framing camera. Jelly liners have different initial perturbation forms on their inner and outer interfaces, being either smooth or sinusoidal. The initial perturbations also have different magnitudes and spatial frequencies (for example, mode n=5, 10, 20). The experimental results show that the growth and coupling of perturbations on inner and outer surfaces are remarkably different. Meanwhile, the relevant 2-D numerical simulation of hydrodynamics combined with Level Set method has been performed. Using the numerical code, we can design the parameters of imploding jelly liner and predict the experimental results. The results of simulation are demonstrated to be in good agreement with the measured data in a series of experiments.

Expansion of Plasma of Electrically Exploding Single Copper Wire Under 4.5 kA?9.5 kA/Wire

The experimental system for electrically exploding single metal wire has been designed and manufactured. Expansion of the dense plasma column formed from an electrically exploding Cu wire of diameter 30 μm has been studied with a high-speed photographer to obtain the time-dependent radius (R-t) curve. The experimental results demonstrate that the mean expansion rate of the dense plasma column is 1.94 μm/ns, 2.6 μm/ns and 3.75 μm/ns according to the peak pulse current 4.5 kA, 7 kA and 9.5 kA respectively. The results can be beneficial to giving a profound understanding of the early stage of wire-array Z-pinch physics and to improvement on their design.

The RT instability in cylindrical implosion of a jelly ring

The interfacial RT instability experiments on imploding jelly liners in cylindrically convergent geometry have been performed. The liners instability growth was observed clearly with a high-speed framing camera. Jelly liners had different initial perturbation forms on their inner and outer interfaces, smooth one or sinusoidal one. The initial perturbations also had different magnitude and spatial frequency (for example, mode n=5, 10, 20). The experimental results show that the growth and coupling of perturbations on inner and outer surface are remarkably different. Meanwhile, the relevant 2D numerical simulation of hydrodynamics combined with Level Set method has been performed.