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Title: The effect of photoionization as an auxiliary discharge on characteristics of thermionic energy converter

Abstract

The cesium filled thermionic energy converters (TEC) operated by the ignited mode have been expected as novel electric power generators, suitable for the space power systems and such terrestrial uses as cogeneration devices. They have the advantage free from the maintenance because of the device without any moving parts. However, the gaps of the electrodes are usually kept less than 1 mm to suppress the negative space potential in the space between the electrodes. Furthermore, for the ignited mode operation, the emitter should be heated up to the temperature higher than 1700 K. Such a restriction and the operating condition should be relaxed to make TEC spread by manufacturing at a moderate price. In the present work, the effect of an auxiliary discharge due to the photoionization has been examined by using TEC operated by the unignited mode with a longer electrode gap, compared with conventional one. It is clarified that the space charge neutrality in the space between both electrodes is drastically improved by the irradiation of Xenon lamp in the case of the emitter temperature lower than 1100 K and that the output current increases by a few times, compared with one without irradiation. This is caused bymore » the photoionized plasma whose density is nearly 10{sup 9} cm{sup -3}.« less

Authors:
;  [1];  [2]
  1. Shizuoka Univ., Hamamatsu (Japan)
  2. Aich Institute of Technology, Toyota (Japan)
Publication Date:
OSTI Identifier:
212849
Report Number(s):
CONF-950749-
TRN: 96:010018
Resource Type:
Conference
Resource Relation:
Conference: 22. international conference on phenomena in ionized gases, Hoboken, NJ (United States), 31 Jul - 4 Aug 1995; Other Information: PBD: 1995; Related Information: Is Part Of XXII International conference on phenomena in ionized gases. Contributed papers 2; Becker, K.H.; Carr, W.E.; Kunhardt, E.E. [eds.]; PB: 226 p.
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; THERMIONIC CONVERTERS; PHOTOIONIZATION; CESIUM; SPACE CHARGE; TEMPERATURE DEPENDENCE; ELECTRIC DISCHARGES; NESDPS Office of Nuclear Energy Space and Defense Power Systems

Citation Formats

Furukawa, H, Kando, M, and Yamada, J. The effect of photoionization as an auxiliary discharge on characteristics of thermionic energy converter. United States: N. p., 1995. Web.
Furukawa, H, Kando, M, & Yamada, J. The effect of photoionization as an auxiliary discharge on characteristics of thermionic energy converter. United States.
Furukawa, H, Kando, M, and Yamada, J. 1995. "The effect of photoionization as an auxiliary discharge on characteristics of thermionic energy converter". United States.
@article{osti_212849,
title = {The effect of photoionization as an auxiliary discharge on characteristics of thermionic energy converter},
author = {Furukawa, H and Kando, M and Yamada, J},
abstractNote = {The cesium filled thermionic energy converters (TEC) operated by the ignited mode have been expected as novel electric power generators, suitable for the space power systems and such terrestrial uses as cogeneration devices. They have the advantage free from the maintenance because of the device without any moving parts. However, the gaps of the electrodes are usually kept less than 1 mm to suppress the negative space potential in the space between the electrodes. Furthermore, for the ignited mode operation, the emitter should be heated up to the temperature higher than 1700 K. Such a restriction and the operating condition should be relaxed to make TEC spread by manufacturing at a moderate price. In the present work, the effect of an auxiliary discharge due to the photoionization has been examined by using TEC operated by the unignited mode with a longer electrode gap, compared with conventional one. It is clarified that the space charge neutrality in the space between both electrodes is drastically improved by the irradiation of Xenon lamp in the case of the emitter temperature lower than 1100 K and that the output current increases by a few times, compared with one without irradiation. This is caused by the photoionized plasma whose density is nearly 10{sup 9} cm{sup -3}.},
doi = {},
url = {https://www.osti.gov/biblio/212849}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {12}
}

Conference:
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