High Efficiency Thermionics (HET-IV) and Converter Advancement (CAP) programs. Final reports

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This report contains the final report of the High Efficiency Thermionics (HET-IV) Program, Attachment A, performed at Rasor Associates, Inc. (RAI); and the final report of the Converter Advancement Program (CAP), performed at the Bettis Atomic Power Laboratory, Attachment B. The phenomenology of cesium-oxygen thermionic converters was elucidated in these programs, and the factors that had prevented the achievement of stable, enhanced cesium-oxygen converter performance for the previous thirty years were identified. Based on these discoveries, cesium-oxygen vapor sources were developed that achieved stable performance with factor-of-two improvements in power density and thermal efficiency, relative to conventional, cesium-only ignited mode ... continued below

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386 p.

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Geller, C. B.; Murray, C. S.; Riley, D. R.; Desplat, J. L.; Hansen, L. K.; Hatch, G. L. et al. April 1996.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 13 times . More information about this report can be viewed below.

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Description

This report contains the final report of the High Efficiency Thermionics (HET-IV) Program, Attachment A, performed at Rasor Associates, Inc. (RAI); and the final report of the Converter Advancement Program (CAP), performed at the Bettis Atomic Power Laboratory, Attachment B. The phenomenology of cesium-oxygen thermionic converters was elucidated in these programs, and the factors that had prevented the achievement of stable, enhanced cesium-oxygen converter performance for the previous thirty years were identified. Based on these discoveries, cesium-oxygen vapor sources were developed that achieved stable performance with factor-of-two improvements in power density and thermal efficiency, relative to conventional, cesium-only ignited mode thermionic converters. Key achievements of the HET-IV/CAP programs are as follows: a new technique for measuring minute traces of oxygen in cesium atmospheres; the determination of the proper range of oxygen partial pressures for optimum converter performance--10{sup {minus}7} to 10{sup {minus}9} torr; the discovery, and analysis of the cesium-oxygen liquid migration and compositional segregation phenomena; the successful use of capillary forces to contain the migration phenomenon; the use of differential heating to control compositional segregation, and induce vapor circulation; the development of mechanically and chemically stable, porous reservoir structures; the development of precise, in situ oxygen charging methods; stable improvements in emitter performance, up to effective emitter bare work functions of 5.4 eV; stable improvements in barrier index, to value below 1.8 Volts; the development of detailed microscopic models for cesium-oxygen reservoir dynamics and collector work function behavior; and the discovery of new relationships between electrode geometry and Schock Instability.

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386 p.

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OSTI as DE96010173

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  • Other Information: PBD: Apr 1996

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  • Other: DE96010173
  • Report No.: WAPD-T--3108
  • Grant Number: AC11-93PN38195
  • DOI: 10.2172/225989 | External Link
  • Office of Scientific & Technical Information Report Number: 225989
  • Archival Resource Key: ark:/67531/metadc665640

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  • April 1996

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  • June 29, 2015, 9:42 p.m.

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  • Nov. 6, 2015, 9:46 p.m.

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Geller, C. B.; Murray, C. S.; Riley, D. R.; Desplat, J. L.; Hansen, L. K.; Hatch, G. L. et al. High Efficiency Thermionics (HET-IV) and Converter Advancement (CAP) programs. Final reports, report, April 1996; Sunnyvale, California. (digital.library.unt.edu/ark:/67531/metadc665640/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.