Field emission gun and electron beam instruments

Details Field emission gun and electron beam instruments Field emission gun and electron beam instruments

2006-12-19

2006-12-19

Vu, David (Department: 2821)

Radiant energy

With charged particle beam deflection or focussing

Magnetic lens

C250S397000, C250S398000

Reexamination Certificate

active

07151268

ABSTRACT:
A field-emission electron gun includes a field-emission cathode including a single fiber-like carbon substance and an electrically-conductive substrate for supporting the substance, an extractor for field-emitting electrons, an accelerating electrode for accelerating the electrons, an extracting power-supply for applying extracting voltage to the extractor, an accelerating power-supply for applying accelerating voltage to the accelerating electrode, and a unit for detecting and monitoring a part of emission current. In this field-emission electron gun, if emission-variation amount has become larger than a predetermined value, the extracting voltage is automatically boosted for a constant length of time, thereby increasing the emission current up to a predetermined value. Further, extracting voltage at the time of boosting the extracting voltage, voltage-boosting time, and the emission current are recorded, then being feed-backed to voltage-boosting conditions for the next-time extracting voltage. Moreover, the accelerating voltage is varied in correspondence with the voltage-boosting of the extracting voltage.

REFERENCES:
patent: 5196707 (1993-03-01), Gesley
patent: 5895919 (1999-04-01), Frosien et al.
patent: 06-162978 (1994-06-01), None
patent: 11-144663 (1999-05-01), None
patent: 2004-079223 (2004-03-01), None
Purcell et al.; “Hot Nanotubes: Stable Heating of Individual Multiwall Carbon Nanotubes to 2000 K Induced by the Field-Emission Current”;Physical Review Letters; The American Physical Society; c. 2002; vol. 88, No. 10; pp. 105502-1-105502-4.

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