|
abstract:
|
The VISA experiment, conducted at the BNL Accelerator Test Facility (ATF), has studied the
properties of SASE FEL process in a saturating system. The experiment utilized a high brightness electron
beam and a strong focusing undulator. Saturated gain greater than 108, with a power gain length below 18
cm, was obtained at 840 nm. Measurements of FEL gain, spectral and angular properties of SASE
radiation are reported, and the results are compared to theory and to start-to-end simulations of the system.
FEL performance was found critically dependent on the compression of the electron beam.
|