Title :
Observations on field-emission electrons from the Los Alamos FEL photoinjector
Author :
Lumpkin, Alex H.
Author_Institution :
Los Alamos Nat. Lab., NM, USA
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.<>
Keywords :
free electron lasers; particle accelerators; Cerenkov radiation; Los Alamos FEL photoinjector; Los Alamos free-electron laser; RF cycle; RF power; background source; field-emission electrons; injector accelerator; intensified cameras; optical transition radiation; parameter sensitivity; photocathode; photoelectric injector; synchroscan streak camera; timing; Cameras; Cathodes; Electron optics; Free electron lasers; Laser transitions; Optical sensors; Power lasers; Radio frequency; Radiofrequency identification; Timing;
Conference_Titel :
Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0135-8
DOI :
10.1109/PAC.1991.164838
