RESULTS FROM THE LIVERPOOL PROTOTYPE INDUSTRIAL FEL (IFEL)

The prototype Industrial FEL (IFEL) now operating at Liverpool is a lo w current demonstrator and represents the UK's first working FEL. This compact, X-band waveguide design employs a 55 keV, 1 mA electron beam and a permanent magnet wiggler of period 1.9 cm. The concept, constru ction details and results obtained so far are all presented here. A pr e-bunching technique allows gain to be achieved with currents between 10 muA and 1 mA in both oscillator and amplifier configurations. Below 0.25 mA the power varies with current squared. In the amplifier mode, the gain curve resembles that of an optical klystron. For future oper ation above 1 mA, if the device is saturated, results indicate the max imum energy removed from the beam will be approximately 8-9 keV per el ectron and the power should be directly proportional to the current.