Abstract
A background source of electrons from the photoelectric injector (PEI) of the Los Alamos free-electron laser (FEL) experiment has been identified. This source is present without the drive laser irradiation and when the RF power is applied to the injector accelerator. Using intensified cameras and a synchroscan streak camera, these electrons have been imaged via optical transition radiation and Cerenkov radiation and characterized. The basic questions of location (photocathode), timing ( approximately 40 to 90 degrees of the RF cycle), magnitude (2.2 nC/ mu s of RF power at 26 MV/m at the photocathode), and parameter sensitivity (accelerator A field's duration and magnitude) have been answered. The properties are consistent with a field-emission mechanism. >
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