EXPERIMENTAL DESIGN AND METHOD OF MAGNETICALLY DRIVEN CONVERGING CYLINDRICAL SOLID LINERS

To address the urgent demand for high-precision experimental platforms in studies of interfacial hydrodynamic instabilities and ejecta mixing in cylindrical convergent loading under extreme dynamic conditions, this paper investigates the experimental design and diagnostic methods for magnetically driven implosion. The conventional integrated electrode-liner structure suffers from constrained liner deformation and poor electrical connection stability, which significantly degrade the uniformity of liner implosion. Based on the FP-2 pulsed power facility at the Institute of Fluid Physics, China Academy of Engineering Physics, we specifically designed an inclined-step sliding electrode-liner split structure, which has been initially verified on the FP-1 facility, and establish a multi-physics synchronous diagnostic system combining laser interferometric velocimetry and X-ray backlight imaging. Experiments verify that the loading uniformity is better than 1% with the azimuthal deviation of velocity at the impact time is less than 20 ns, effectively ensuring the integrity of liner motion and the reliability of electrical connection. Using a one-dimensional magnetohydrodynamic model coupling the RLC circuit, Grüneisen equation of state, and Steinberg-Cochran-Guinan constitutive relation, we optimize the experimental loading configuration and interfacial diagnostic method, enabling the capabilities for secondary shock loading and observation of interfacial friction-slip evolution. This work focuses on the construction and validation of experimental techniques on the FP-2 platform, which can provide reliable experimental support for studies on interfacial evolution and ejecta mechanisms, and the relevant techniques can be transplanted to driver platforms with higher current parameters.