Title :
Possible efficiency-enhancement of metal photocathode for DISKTRON electrostatic accelerator
Author :
Tanabe, T. ; Kawamura, Y. ; Li, D. ; Toyoda, K.
Author_Institution :
RIKEN, Inst. of Phys. & Chem. Res., Saitama, Japan
Abstract :
Possibility of increasing quantum efficiency of metal photocathodes by geometric alteration is being investigated. The fourth harmonic light of Nd:YAG is used to produce photoelectrons on a metal surface. The pulse length is about 50 ps (FWHM) and the peak current is greater than 2 A at 0.7 MeV, This scheme employs a grooved surface with adjusted polarization and other pertinent parameters such as extraction voltage. The measurements are done after acceleration by DISKTRON electrostatic accelerator which, with a combination of a laser-induced photocathode, gives fairly controllable bright short-pulse-electron-beam up to the energy of over 1 MeV. This configuration permits us to find the overall improvement of e-beam characteristics for the future laser-undulator-experiment
Keywords :
beam handling techniques; electron accelerators; electron beams; electron sources; electrostatic accelerators; photocathodes; 0.7 MeV; 50 ps; DISKTRON electrostatic accelerator; Nd:YAG; YAG:Nd; YAl5O12:Nd; adjusted polarization; efficiency-enhancement; extraction voltage; fourth harmonic light; geometric alteration; grooved surface; laser-induced photocathode; laser-undulator-experiment; metal photocathode; peak current; pulse length; quantum efficiency; short-pulse-electron-beam; Acceleration; Cathodes; Chemical lasers; Electron beams; Electrostatics; Laser mode locking; Laser theory; Optical polarization; Optical surface waves; Surface emitting lasers;
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-1203-1
DOI :
10.1109/PAC.1993.309532
