Field emission electron gun

Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Distributed parameter resonator-type magnetron

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Details

250311, 313336, H01J 2956, H01J 37285

Patent

active

040203875

ABSTRACT:
A field emission gun in which a field emission tip for generating charged particles is axially aligned with apertures in an intermediate electrode and a main electrode. A field electrode is placed in juxtaposition to the field emission tip for developing a particle generation field. This electrode is located relative to the field emission tip and the intermediate electrode to effect a predetermined focal distance and level of electron beam intensity. Use of a field electrode permits utilization of lower focusing and acceleration voltages and renders the device less sensitive to variations in field emission tip design and performance.

REFERENCES:
patent: 2249453 (1941-07-01), Boersch et al.
patent: 3191028 (1965-06-01), Crewe
patent: 3602710 (1971-08-01), Mueller

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