HIGH-CURRENT-DENSITY CATHODE-RAY TUBE ELECTRON SOURCE.
Quarterly progress rept. no. 5, 1 Jun-31 Aug 65,
GENERAL ELECTRIC CO SYRACUSE NY PICKUP TUBE OPERATION
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The life test on the 0.359-inch-diameter cathode was discontiuned after 11,490 hours of operation because of low emission. The test was conducted at a cathode temperature of 1000 C. Throughout the first 9000 hours of the test, the emission current under fixed DC conditions varied between 4 and 5 amperessqcm when the test was terminated, emission had dropped to 2.81 amperessqcm. With the objectives of improving emission, life, and reducing sublimation, a concerted effort was made to produce and evaluate cathodes containing an iridium matrix in place of tungsten. The cathodes containing the iridium matrix behaved differently, under the normal processing conditions, than cathodes containing tungsten, making it difficult to produce mechanically sound specimens. The emission test results were encouraging on the one cathode that was sufficiently sound to warrant testing. An evaluation of a modified UHR-CRT cathode was undertaken. Author
- Electrooptical and Optoelectronic Devices