Chappell, J., Adli, E., Agnello, R., Aladi, M., Andrebe, Y., Apsimon, O., et al. (2021). Experimental study of extended timescale dynamics of a plasma wakefield driven by a self-modulated proton bunch. Physical Review Accelerators and Beams, 24: 011301. doi:10.1103/PhysRevAccelBeams.24.011301.