New millimeter-wave diagnostics to locally probe internal density and magnetic field fluctuations in National Spherical Torus Experiment-Upgrade (invited). - Macwan, T.; Barada, K.; Kubota, S.; Lantsov, R.; Bradley, L.; Pratt, Q.; Hong, R.; Michael, C. A.; Hall-Chen, V.; Wisniewski, J.; Dong, J.; Stratton, B.; et al. (Review of Scientific Instruments, 2024)