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ELECTRON GUN FOR LARGE ORBIT GYROTRON (LOG) WITH DECREASED INFLUENCE OF CATHODE PLASMA ON ELECTRON BEAM PROPERTIES |
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| Authors: | V. N. Manuilov T. Idehara M. Kamada T. Hayashi La Agusu T. Kanemaki K. Yatsui Wiehua Jiang |
| Affiliation: | (1) Research Center for Development of Far-Infrared Region, University of Fukui (FIR FU), Bunkyo 3-9-1, Fukui 910-8507, Japan;(2) Radiophysical Department of Nizhny Novgorod state University, 690005, Gagarin av., 23, Nizhny Novgorod, Russia;(3) Extremely High-Energy Density Research Institute, Nagaoka Institute of Technology, Nagaoka, Niigata 940-2188, Japan |
| Abstract: | High power Large Orbit Gyrotron (LOG) [1] is now under development at FIR FU. First version of this device was recently manufactured and then assembled with power supply ETIGO-IV [2]. Results of preliminary tests of electron-optic system are presented. The conditions when stableflat form of current pulse realized are discussed. Analytical estimations of cathode-anode distance to achieve small influence of cathode plasma during high voltage (HV) pulse are performed. Two new electron gun versions with decreased influence of the cathode plasma on its impedance and pulse form are suggested and optimized. New optimal magnetic field distributions are found. First gun has quiasi-flat cathode configuration near the anode diaphragm and provides operating current about 60 A. Second one uses blade cathode with operating current about 30 A. Beam quality for both guns is suitable for LOG operation. |
| Keywords: | explosion emission helical electron beam electron gun Large Orbit Gyrotron |
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