부산대학교 도서관

We developed a composite wire array platform to generate an axial dynamic magnetic mirror (DMM) around the precursor plasma column of cylindrical wire-array Z-pinches. The mirror field is driven by the Z-pinch current itself and increases with the main current pulse. A 3-axis Thomson scattering system is used to probe the velocity and temperature of the precursor plasma while laser interferometry provides 2D side-on line-integrated electron density measurements. We observed that the DMM configuration reduces axial outflow of the precursor plasma when compared to standard Z-pinch without axial magnetic field, but the resulting precursor plasma is colder due to the conversion of ablation stream kinetic energy to magnetic energy instead of heat as the ablation streams converge on axis. When the DMM and a twisted wire array configuration were constructed to have similar axial magnetic fields in the wire array implosion region, the DMM precursor plasma is observed inside a radius of Imm to have an increased ion temperature of approximately 40% and an increase in electron density of approximately 60% as compared to the twisted wire array precursor plasma.