Preliminary Results from Prototype Niobium Cavities for the JLab Ampere Class FEL Marhauser, F. ; Kneisel, P. ; Ciovati, G. ; Bundy, R. ; Clemens, B. ; Forehand, D. ; Golden, B. ; Manning, S. ; Manus, B. ; Overton, R. ; Rimmer, R. A. ; Slack, G. ; Turlington, L. ; Wang, H. Abstract Publication: 22nd Particle Accelerator Conference (PAC 07) Pub Date: 2007 Bibcode: 2007pac..conf.2487M