High-Current Electron Gun with a Field-Emission Cathode and Diamond Grid

2005 ◽  
Vol 50 (10) ◽  
pp. 1360 ◽  
Author(s):  
N. N. Dzbanovskiı̆
Keyword(s):  
Field Emission ◽  
Electron Gun ◽  
High Current ◽  
Field Emission Cathode ◽  
Current Electron ◽  
Emission Cathode ◽  
High Current Electron

Noise and energy broadening in field emission systems

1978 ◽  
Vol 36 (1) ◽  
pp. 56-57 ◽  
Author(s):  
K.C.A. Smith ◽  
A.D.G. Cumming
Keyword(s):  
Field Emission ◽  
Axial Magnetic Field ◽  
Chromatic Aberration ◽  
Electron Gun ◽  
High Current ◽  
Field Emission Cathode ◽  
Transmission Microscopy ◽  
Control Electrode ◽  
Tip Radius ◽  
Emission Cathode

To improve the performance of the field emission electron gun requires that greater total currents are drawn from the field emission cathode. This involves various practical difficulties associated with the vacuum environment, and in addition, the Boersch effect energy broadening may become important at high currents and for certain applications, for example in pulsed transmission microscopy (Smith and Cleaver, 1976). As part of a study of field emission guns under high current conditions we have measured the energy spreads in a pulsed triode gun system. Positive going pulses on the control electrode, or Wehnelt, were used to draw peak currents of up to 2 mA for 10 μS durations, the pulses being of 4 kV amplitude. A (111) orientated single crystal tungsten cathode was used, of 150 mm tip radius, and the energy of the emitted electrons measured in an analyser due to Brack (1962). This consists of a three electrode einzel lens with a superimposed axial magnetic field, and is designed to have a high coefficient of chromatic aberration.

scholarly journals Катодный узел сильноточной электронной пушки с многоканальным инициированием эмиссии пробоем по поверхности диэлектрика

2020 ◽  
Vol 46 (15) ◽  
pp. 47
Author(s):  
П.П. Кизириди ◽  
Г.Е. Озур
Keyword(s):  
Electron Gun ◽  
High Current ◽  
Explosive Emission ◽  
Plasma Anode ◽  
Traditional Scheme ◽  
Cathode Assembly ◽  
Explosive Emission Cathode ◽  
Current Electron ◽  
Emission Cathode ◽  
High Current Electron

A new scheme of the cathode assembly of a high-current electron gun is presented. Initiation of explosive emission is performed with the help of sixty nine simultaneously operating spark gaps which electrodes and tube ceramic isolators are inserted into a disc explosive-emission cathode. The operability and high emissivity of the cathode assembly which exceeds by 1.5‒1.7 times the value inherent in traditional scheme of an electron gun with plasma anode and copper-braid explosive-emission cathode has been demonstrated.

scholarly journals Токовые характеристики сильноточной электронной пушки с многоканальным инициированием взрывной эмиссии пробоем по поверхности диэлектрика

2021 ◽  
Vol 91 (11) ◽  
pp. 1764
Author(s):  
В.И. Петров ◽  
П.П. Кизириди ◽  
Г.Е. Озур
Keyword(s):  
Electron Gun ◽  
Arc Plasma ◽  
High Current ◽  
Explosive Emission ◽  
Plasma Sources ◽  
Cathode Assembly ◽  
Explosive Emission Cathode ◽  
Current Electron ◽  
Emission Cathode ◽  
High Current Electron

Current characteristics of a plasma-filled, high-current electron gun with a new cathode assembly which can be named as a controlled explosive-emission cathode have been investigated. Multi-gap initiation of explosive emission is performed with the use of parallel operated, resistively decoupled arc plasma sources which electrodes and tube ceramic isolators are built-in to the explosive-emission cathode. The initiation of explosive emission was performed using 69 operating in parallel arc plasma sources whose electrodes and tubular ceramic insulators are inserted to the disk explosive-emission cathode. Experiments have demonstrated operability of high-current electron gun with a new cathode assembly at accelerating voltage up to 30 kV and its good emissivity (average in area current density) which was approximately 1.4–2.4 times higher than an emissivity of traditional electron gun with plasma anode and multi-wire copper cathode.

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