Parker Solar Probe Observations of Proton Beams Simultaneous with Ion-scale Waves - Verniero,JL; Larson,DE; Livi,R; Rahmati,A; McManus,MD; Pyakurel,PS; Klein,KG; Bowen,TA; Bonnell,JW; Alterman,BL; Whittlesey,PL; Malaspina,DM; et al. (ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2020)