Travelling-wave tuve provided with a brazed "T" shaped helix del

Details Travelling-wave tuve provided with a brazed "T" shaped helix del Travelling-wave tuve provided with a brazed "T" shaped helix del

1990-04-06

1992-07-21

Laroche, Eugene R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Combined cathode ray tube and circuit element structure

315 393, 333162, H01J 2327

Patent

active

051325918

ABSTRACT:
Disclosed is a travelling-wave tube with helix. The helix is mounted in a metal sleeve and is held in a centered position by at least three dielectric rods. Parts of the helix are in contact with the rods. The helix is made out of a thin strip of a metal that is a good conductor of heat and electricity. Instead of having a rectangular cross-section, the thin strip now has a T-shaped cross-section, at least at all the parts of the helix that are in contact with the rods. The base of the T is brazed to the rods. This structure prevents the risk of electric arcs at the facing brazing beads on two consecutive turns of the helix. The disclosure can be applied to travelling-wave tubes operating in wide bandwidth and at high peak power and/or mean power values.

REFERENCES:
patent: 2889487 (1959-06-01), Birdsall et al.
patent: 4185225 (1980-01-01), Doehler et al.
patent: 4263532 (1981-04-01), Grosset
patent: 4264842 (1981-04-01), Galuppi
International Electron Devices Meeting, San Francisco, CA, Dec. 13-15, 1982, pp. 18-21, IEEE, New York, U.S.; R. M. Phillips: "Some Surprising helical interaction circuits may hasten millimeter waves".

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