The APS SASE FEL: Status and commissioning results Milton, S. V. ; Biedron, S. G. ; den Hartog, P. ; Lewellen, J. W. ; Moog, E. ; Nassiri, A. ; Travish, G. Abstract Publication: 18th IEEE Particle Accelerator Conference Pub Date: 1999 Bibcode: 1999pac..conf.2483M