在DPF - 40等离子体焦点装置中，首次观测到径向运动电流壳层的一种不稳定现象，即不稳定模式。
An instability phenomenon of the current sheath implosion, namely the unstable mode, has been observed in the DPF 40 plasma focus device.
在此模型中，把非均匀等离子体球分成若干个同心等离子体球壳，并且假定每一个同心壳层内等离子体密度均匀分布。
In this model, the nonuniform sphere is modeled by Numbers of concentric spherical shells, and each has a fixed electron density.
应用推荐