GB713157A - Improvements in anode structures - Google Patents

Abstract

713,157. Thermionic valves. ' CHATHAM ELECTRONICS CORPORATION. Oct. 30, 1952, No. 27322/52. Class 39(1) An anode structure for a gaseous discharge device comprises a lead-in conductor 13 for the anode 16, a cylindrical conducting guard 25 secured to the anode and surrounding the lead-in conductor an inner cylindrical insulator 15 surrounding the guard 25, and an outer cylindrical insulator 12 surrounding the insulator 15. The anode may be surrounded by a shield structure comprising a flat disc 23, a cylinder 22, a grid 20 and a baffle plate 21; the shield structure may be secured to the outer cylindrical insulator 12 by a clamp 24. The spacing between cylinders 12 and 15 should be less than one-tenth of the mean free path of the gas and may be 0.03 inches; the envelope and the cylinders 12 and 15 may be of glass. In a modification, Fig. 3, the cylinders 12 and 15 terminate at the re-entrant part of the envelope which may be filled with an insulating substance 18 such as wax or silicone jelly In a further modification, Fig. 2 (not shown), the anode lead is surrounded by three insulating cylinders. The anode structure may be used in.a tube with a filling of hydrogen at 400-900Á pressure; the tube may be operated at a potential of 40kV and with a peak current of 2,500 A.