Commissioning and initial operation of the W7-X neutral beam injection heating system. - McNeely, P.; Äkäslompolo, S.; Auerweck, W.; Drider, Y.; Ford, O.P.; Hartmann, D.A.; Heinemann, B.; Heinrich, S.; Hopf, C.; Kairys, R.; Obermayer, S.; Riedl, R.; et al. (Fusion Engineering & Design, 2020)