Thoriated tungsten hairpin-filament electron source for high- brightness applications


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    		Views: (2018)   Date: (Publication Date: Jul 1977)   Pages: ()

  • Author:  Murray  R. G. Collier  R. J. Bell Telephone Laboratories  Murray Hill  New Jersey 07974;  

  • Abstract:  Abstract A carburized 2% thoriated tungsten hairpin-filament electron source, 0.125 mm in diameter, which operates at 10 kV with a brightness level of 5×104 A?cm-2?sr-1 and has a rated life time of ?700 h is described. The operating temperature of ?1900 K (optical) is about 800 K below that of plain tungsten for the same brightness, and accounts for the order-of-magnitude increase in life. Methods for obtaining the required vacuum environment and carrying out the carburization are discussed.

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