Electron gun design

Details Electron gun design Electron gun design

H - Electricity

01

J

353/14, 313/142,

H01J 3/02 (2006.01) H01J 3/38 (2006.01)

Patent

CA 1286769

ABSTRACT An electron gun which is rugged, provides good thermal decoupling of the cathode, permits precise alignment of the elec- trodes 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 adjust- ing 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 screws 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.

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