Book excerpt: Z-pinch plasma dynamics are largely determined by the current and magnetic field topology of the system. Measurement of the magnetic fields allows for the inference of the current distribution, but is in practice difficult to measure in experiments. This leads to a high dependence on numerical simulations for extracting this information, but without quality experimental data, may not be entirely reliable for this purpose. Proton deflectometry, or proton radiography, is a relatively new diagnostic developed for investigating electromagnetic fields in high energy-density plasmas since it provides data with high spatial and temporal resolution compared to traditional field diagnostics. It was developed in the laser-plasma-interaction community as a means of determining electric and magnetic field strength and orientation during laser-driven plasma experiments. In this work, the method was developed for use on Mega-Amp-scale pulsed-power-driven plasma experiments. In one configuration, a proton beam was directed radially, with respect to the z-axis of a pulsed-power-driven short-circuit load. In this setup, an azimuthally symmetric magnetic field is generated around the short-circuit load, as a current pulse, 0.6 MA in 0-100% rise-time 200 ns with an approximately sine-squared waveform. Scaled laboratory astrophysics experiments modeling the dynamics of universal astrophysical phenomena such as plasma jets have recently become an area of great interest. Such experiments are vital to resolving long-standing questions about the roles of various physical processes in the dynamics of such objects. The application of proton deflectometry to scaled laboratory astrophysics experiments revealed details of the current and magnetic field topology which was previously accessible only in numerical codes. One such load is the radial foil load, designed to replicate the propagation of a jet during the formation stages of a star. The data from this work was used to benchmark a resistive MHD code, Gorgon, designed to reproduce the Z-pinch experiments as well as astrophysical phenomena. The simulation results were found to agree with the experimental data, meaning that the current and magnetic field topology could be recovered from the code. The demonstration of this diagnostic technique opens up many possibilities for examining the current and magnetic field topology in other Z-pinch experiments.