Pablant, N., Langenberg, A., Alonso, A., Baldzuhn, J., Beidler, C. D., Bozhenkov, S., et al. (2020). Investigation of the neoclassical ambipolar electric field in ion-root plasmas on W7-X. Nuclear Fusion, 60: 036021. doi:10.1088/1741-4326/ab6ea8.