Noise-Tested Cathode Activation / F. Dlouhy, H. J. Schuetze
- Conference Author:
- Materials and Electron Device Processing (1961 : Philadelphia, Pa.)
- Physical Description:
- 1 online resource (15 pages) : illustrations, figures, tables
- Additional Creators:
- Dlouhy, F., Schuetze, H. J., American Society for Testing and Materials, and ASTM International
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- The plate current of an electron tube producing a reasonable shot-noise level reflects the variation of the oxide cathode activity during the activation and aging process. When operating several lots of tubes at different cathode temperatures in the range from 1000 to 1500 K under stand-by conditions a set of emission curves is obtained showing maxima. A straight line is obtained by plotting the activating temperature versus time corresponding to the maxima. This is the base for developing activation schedules giving optimum activity of the cathode in the shortest time. The solution of the problem consists in an activation procedure with several temperature steps while simultaneously considering electron bombardment of the electrodes that affect the cathode activity. The net result is an approximate parallel shift of the straight line responsible for the so-called single-step activation. The position and the slope of this line in semilogarithmic representation are affected by core material and processing.
- Dates of Publication and/or Sequential Designation:
- Volume 1961, Issue 300 (January 1961)
- 9780803159631 (e-ISBN)
- Digital File Characteristics:
- text file PDF
- Bibliography Note:
- Includes bibliographical references 16.
- Other Forms:
- Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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- Reproduction Note:
- Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1961. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
- Technical Details:
- Mode of access: World Wide Web.
- Source of Acquisition:
- ASTM International PDF Purchase price USD25.
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