scholarly journals Field emission cathode for high power beams

1983 ◽  
Vol 1 (2) ◽  
pp. 207-210 ◽  
Author(s):  
Rodney Petr ◽  
Martin Gundersen
Keyword(s):  
Field Emission ◽  
High Power ◽  
High Current ◽  
Field Emission Cathode ◽  
Practical Applications ◽  
High Power Operation ◽  
Power Operation ◽  
Current Emission ◽  
Emission Cathode

Field emission is identified as the mechanism responsible for high current emission (50 A/cm2 at 300°K) from a dispenser-type cathode. This cathode has advantages for high power operation, and should be suitable for practical applications.

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.

Electron-optical systems with planar field-emission cathode matrices for high-power microwave devices

2013 ◽  
Vol 58 (4) ◽  
pp. 357-365 ◽  
Author(s):  
S. P. Morev ◽  
N. P. Aban’shin ◽  
B. I. Gorfinkel’ ◽  
A. N. Darmaev ◽  
D. A. Komarov ◽  
...  
Keyword(s):  
Field Emission ◽  
High Power ◽  
Optical Systems ◽  
Microwave Devices ◽  
Field Emission Cathode ◽  
High Power Microwave ◽  
Power Microwave ◽  
Emission Cathode

A carbon nanotube field emission cathode with high current density and long-term stability

2009 ◽  
Vol 20 (32) ◽  
pp. 325707 ◽  
Author(s):  
Xiomara Calderón-Colón ◽  
Huaizhi Geng ◽  
Bo Gao ◽  
Lei An ◽  
Guohua Cao ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Field Emission ◽  
Current Density ◽  
High Current Density ◽  
High Current ◽  
Field Emission Cathode ◽  
Term Stability ◽  
Long Term Stability ◽  
Emission Cathode

Field emission cathode array development for high-current-density applications

1983 ◽  
Vol 16 (1-2) ◽  
pp. 268-276 ◽  
Author(s):  
Charles A. Spindt ◽  
Christopher E. Holland ◽  
Robert D. Stowell
Keyword(s):  
Field Emission ◽  
Current Density ◽  
High Current Density ◽  
High Current ◽  
Field Emission Cathode ◽  
Emission Cathode

High-power operation of 630 nm-band transverse-mode stabilised AlGaInP laser diodes with current-blocking region near facets

1991 ◽  
Vol 27 (8) ◽  
pp. 661 ◽  
Author(s):  
H. Hamada ◽  
M. Shono ◽  
S. Honda ◽  
R. Hiroyama ◽  
K. Matsukawa ◽  
...  
Keyword(s):  
High Power ◽  
Laser Diodes ◽  
Transverse Mode ◽  
High Power Operation ◽  
Power Operation ◽  
Current Blocking
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