Gas overload and metalization prevention for x-ray tubes

Details Gas overload and metalization prevention for x-ray tubes Gas overload and metalization prevention for x-ray tubes

1997-11-21

2000-03-28

Porta, David P.

X-ray or gamma ray systems or devices

Source

Electron tube

378119, H01J 3504

Patent

active

060441291

ABSTRACT:
An x-ray tube includes an anode, a cathode, and an electrode disposed in an evacuated envelope. The electrode is positioned such that the electrode is remote from an area in immediate proximity to the envelope. An electric field defined by electrode is of sufficient strength such that arcing preferentially occurs between the electrode and the anode as opposed to occurring between the cathode and anode. The electrode is further situated such that metal sputtered from the electrode substantially falls in a define region on the anode and serves as an active getter for pumping gas from the envelope. The electrode is composed of an active metal which, upon being passively heated by the anode, also acts as a getter material to aid in pumping gas from the envelope.

REFERENCES:
patent: 3243636 (1966-03-01), Nineuil
patent: 3735176 (1973-05-01), Langer et al.
patent: 4315182 (1982-02-01), Furbee
patent: 4414681 (1983-11-01), Seifert
patent: 5509045 (1996-04-01), Kautz

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