Title :
Investigations of cold cathode emission in gas and vacuum with picosecond resolution
Author :
Mesyats, Gennady ; Shunaylov, Sergey ; Sharypov, Konstantin ; Shpak, Valery ; Yalandin, Michael
Author_Institution :
Lebedev Phys. Inst., Moscow, Russia
Abstract :
Electron beam formation in magnetically insulated coaxial diode with tubular cold cathode and a strongly non-uniform electric field was investigated with picosecond resolution. Voltage pulses of amplitudes up to -170 kV (in a traveling wave mode) and FWHM not exceed 250 ps were applied to the cathode. Under such accelerating pulse parameters the polishing effect has a fundamental influence on the emissive characteristics. The time and amplitude parameters of electron beam injection were compared experimentally for different cathode materials with gas or vacuum insulation of accelerating gap.
Keywords :
cathodes; cold-cathode tubes; electron beams; electron sources; thermionic emission; vacuum tubes; accelerating gap gas insulation; accelerating gap vacuum insulation; accelerating pulse parameters; cathode materials; cold cathode emission; electron beam formation; electron beam injection; emissive characteristics; magnetically insulated coaxial diode; picosecond resolution; polishing effect; strongly nonuniform electric field; tubular cold cathode; voltage pulse; Cathodes; Connectors; Geometry; Steel;
Conference_Titel :
High Power Particle Beams (BEAMS), 2008 17th International Conference on
Conference_Location :
Xian
