Observations on field-emission electrons from the Los Alamos FEL photoinjector

Author

Lumpkin, Alex H.

Author_Institution

Los Alamos Nat. Lab., NM, USA

fYear

1991

fDate

6-9 May 1991

Firstpage

1967

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/PAC.1991.164838

Filename

164838