Title :
Nonuniform cathode emission studies of a MIG gun
Author :
Marchewka, C.D. ; Petillo, J.J. ; Shapiro, M.A. ; Sirigiri, J.R. ; Temkin, R.J.
Author_Institution :
MIT Plasma Sci. & Fusion Center, Cambridge, MA, USA
Abstract :
We present results on the first full 3D modeling of a magnetron injection gun (MIG) to study emission nonuniformity using the MICHELLE 3D code. The results indicate the effects of nonuniform current emission on velocity spread and pitch factor. Nonuniform emission has been shown to be detrimental to the efficiency of gyrotron operation. The model is based on a 96 kV, 40 A MIG used in a 110 GHz, 1.5 MW gyrotron experiment operating in short pulses at MIT and in long pulse/CW mode at CPI. The MIT gyrotron uses capacitive probes to determine the azimuthal variation in the pitch factor to compare with simulation.
Keywords :
cathodes; electron field emission; gyrotrons; magnetrons; 1.5 MW; 110 GHz; 40 A; 96 kV; MICHELLE 3D code; MIT gyrotron; capacitive probe; emission nonuniformity; long pulse mode; magnetron injection gun; nonuniform cathode emission; nonuniform current emission; Azimuthal current; Cathodes; Current density; Current measurement; Density measurement; Electron beams; Gyrotrons; Probes; Rotation measurement; Temperature dependence;
Conference_Titel :
Infrared and Millimeter Waves and 13th International Conference on Terahertz Electronics, 2005. IRMMW-THz 2005. The Joint 30th International Conference on
Print_ISBN :
0-7803-9348-1
DOI :
10.1109/ICIMW.2005.1572690
