Research of implosion dynamics for wire array Z pinch

The implosion dynamics of wire array Z pinch can be divided into four stages: (1) wire ablation; (2) formation of plasma shell; (3) implosion; (4) stagnation. Based on the optical-framing camera and the soft X-ray framing camera, lots of experiments on the early stage of wire array Z pinch and imploding dynamics have been carried out. Images of wire array Z pinch from wire ablation to plasma column breakdown were obtained. The main results were as follows: (1) There is a long ablation stage, and the wire ablation is not uniform along the axis. The imploding experimental trajectory is consistent with the phenomenological model. (2) The cathode emission is obviously observed in both optical images and X ray images. In the late stage of implosion, there is obvious trailing radiation distribution around the cathode. (3) The precursor plasma column is formed after the collision of the ablating plasma at the axis, which expands at first, then becomes compressed. (4) The temperature and ionization stage of corona plasma were estimated according to its azimuthally expanding velocity.