Field emission gun with noise compensation

Details Field emission gun with noise compensation Field emission gun with noise compensation

1980-03-17

1982-06-29

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2952

Patent

active

043374220

ABSTRACT:
A field emission gun, for either electron or positive ion emission, in which the beam current between source and sample is measured at accelerating voltage potential between two concentric shields that enclose the gun, its power supplies, and the measuring circuitry. The outer shield is directly connected to the high voltage terminal of the accelerating voltage supply while the inner shield is at the local ground reference of the emission source and associated components. The current between the concentric shields is measured, converted to a proportional voltage signal, compared with the reference voltage, and applied to a field strength controlling electrode in the vicinity of the emission source to modulate the emission and to maintain a constant beam current.

REFERENCES:
patent: 3887839 (1975-06-01), Ota et al.

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