RESULTS FROM THE ADVANCED PHOTON SOURCE SASE FEL PROJECT S.V. Milton reporting for the APS LEUTL Commissioning Team http://www.aps.anl.gov/asd/leutl/CommissioningTeam.html

Measurements of self-amplified spontaneous emission (SASE) at 530 nm were made at the Advanced Photon Source (APS) low-energy undulator test line facility (LEUTL). Exponential growth of the optical signal as a function of distance was measured and compared to theoretical estimates. SASE was first observed using a beam generated from a photocathode rf gun system. It was later repeated using beam from a thermionic rf gun system. Following a brief description of the LEUTL facility, we will present our results and initial analysis. 1 DESCRIPTION