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US 4,900,982 AGranted
Electron gun design
AssigneeAtomic Energy of Canada Limited-Energie Atomique Du Canada Comitee
InventorHans J. Kolpin
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AssigneeAtomic Energy of Canada Limited-Energie Atomique Du Canada Comitee
InventorHans J. Kolpin
Estimating the term…
An electron gun which is rugged, provides good thermal decoupling of the hode, permits precise alignment of the electrodes to be achieved easily and allows geometric changes to be carried out with ease is described. In the cathode assembly three set screws and a split ring of insulating material are used to secure the cathode. Alignment is achieved by suitably adjusting the set screws and because contact can be limited to the three set screws thermal coupling is reduced. Similarly a Whenelt electrode is secured and aligned by a further group of set screws. Finally, the anode is secured to replaceable stand-offs by means of screw passing through oversized holes in an anode plate. The oversized holes permit easy alignment and the use of stand-offs permits the spacing between anode and cathode to be changed as desired by replacing the stand-offs.
A cathode assembly for mounting in an electron gun, comprising a metal support member having a first portion for securing the support member to a cathode assembly support within the gun and having a second portion which is generally cylindrical, a plurality of set screws spaced around the periphery of the second portion and extending radially through the thickness of the second portion, a split ring of solid insulating material having an outer diameter slightly less than the inner diameter of the first portion of the metal support member and being received within the first portion, a metal cylindrical holder having an outer diameter less than the inner diameter of the split ring and being received within the split ring to define with respect to the split ring a cylindrical space, a metal cathode tube carrying at its one end a cathode and heater and having at its other end a portion which is received snugly within the cylindrical space, the cathode tube having a bore through which extend heater leads, whereby axial alignment of the cathode can be adjusted by means of the set screws.
A Whenelt electrode assembly for mounting in an electron gun, comprising a Whenelt electrode and a cylindrical metal housing having at one end means for securing the housing to a cathode assembly and having at the other end securing means for securing the Whenelt electrode across the bore of the housing, the securing means comprising a plurality of set screws spaced around the periphery of the housing and extending radially through the housing to engage complementary groove means in the periphery of the Whenelt electrode, the Whenelt electrode having an outer diameter less than the diameter of the housing bore whereby axial alignment of the Whenelt electrode can be adjusted by means of the set screws.
An anode assembly for mounting in an electron gun, comprising metal mounting means having a plurality of spaced parallel post portions attachable at a first end to a vacuum flange of the electron gun and having at a second end means for mounting an anode so as to extend in a transverse plane when the post portions, the means for mounting being arranged to hold the anode at a selected one of a plurality of different portions in the transverse plane whereby axial alignment of the anode can be adjusted.
Dependencies are inferred from the claim text.