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On account of its polarizability and magnetic field sensitivity, as well asthe role of neutral helium in partially ionized solar environments, the neutralhelium triplet (orthohelium) system provides important, yet under-utilized,diagnostics of solar coronal rain. This work describes off-limb observations ofcoronal rain in NOAA Active Region 12468 obtained in the He I 10830 $\AA$triplet using the Massively MultipleXed Imaging Spectrograph experiment at theDunn Solar Telescope along with co-temporal observations from NASA's SolarDynamics Observatory and the Interface Region Imaging Spectrograph. We detectrain simultaneously in the IRIS 1400 $\AA$ and 2796 $\AA$ channels and in He I10830 $\AA$. The large degree of spatial coherence present between all channelsagrees with previous observations of the multi-thermal nature of coronal rain.A statistical analysis of He I spectral profiles for rain identified viaautomated detection indicate He I line radiances are, on average, $10^{4}$ ergscm$^{-2}$ s$^{-1}$ sr$^{-1}$; the average translational velocity is 70 kms$^{-1}$ and Doppler widths are distributed around 10 km s$^{-1}$. Based onthese results, forward models of expected He I polarized signals allow us toestimate, using synthetic observables and an inversion algorithm including fitsfor the scattering angle constraining the material's location along-the-line ofsight, the magnetic sensitivity of the upcoming National Science Foundation'sDaniel K. Inouye Solar Telescope. We predict joint observations of the He I10830 $\AA$ and 5876 $\AA$ multiplets, using first-light instrumentation, willprovide inverted magnetic field errors of $\pm3.5$ G ($2\sigma$) for spatialscales of $0.5''$ ($\sim360$ km) assuming dynamically-limited integration timesof 5.5 seconds.

Neutral Helium Triplet Spectroscopy of Quiescent Coronal Rain with Sensitivity Estimates for Spectropolarimetric Magnetic Field Diagnostics