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Title: RTG performance on Galileo and Ulysses and Cassini test results

Abstract

Power output from telemetry for the two Galileo RTGs are shown from the 1989 launch to the recent Jupiter encounter. Comparisons of predicted, measured and required performance are shown. Similar comparisons are made for the RTG on the Ulysses spacecraft which completed its planned mission in 1995. Also presented are test results from small scale thermoelectric modules and full scale converters performed for the Cassini program. The Cassini mission to Saturn is scheduled for an October 1997 launch. Small scale module test results on thermoelectric couples from the qualification and flight production runs are shown. These tests have exceeded 19,000 hours are continuing to provide increased confidence in the predicted long term performance of the Cassini RTGs. Test results are presented for full scale units both ETGs (E-6, E-7) and RTGs (F-2, F-5) along with mission power predictions. F-5, fueled in 1985, served as a spare for the Galileo and Ulysses missions and plays the same role in the Cassini program. It has successfully completed all acceptance testing. The ten years storage between thermal vacuum tests is the longest ever experienced by an RTG. The data from this test are unique in providing the effects of long term low temperaturemore » storage on power output. All ETG and RTG test results to date indicate that the power requirements of the Cassini spacecraft will be met. BOM and EOM power margins of at least five percent are predicted.« less

Authors:
;  [1]
  1. Lockheed Martin Corporation P.O. Box 8555, 29B41-KB, Philadelphia, Pennsylvania 19101 (United States)
Publication Date:
OSTI Identifier:
21165725
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 387; Journal Issue: 1; Conference: STAIF-97: Space technology and applications international forum, Albuquerque, NM (United States), 26-30 Jan 1997; Other Information: DOI: 10.1063/1.51981; (c) 1997 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; 07 ISOTOPES AND RADIATION SOURCES; COMPARATIVE EVALUATIONS; PERFORMANCE; PERFORMANCE TESTING; RADIOISOTOPES; SPACE VEHICLES; TELEMETRY; THERMOELECTRIC CONVERSION; THERMOELECTRIC GENERATORS; THERMOELECTRICITY; NESDPS Office of Nuclear Energy Space and Defense Power Systems

Citation Formats

Kelly, C Edward, and Klee, Paul M. RTG performance on Galileo and Ulysses and Cassini test results. United States: N. p., 1997. Web. doi:10.1063/1.51981.
Kelly, C Edward, & Klee, Paul M. RTG performance on Galileo and Ulysses and Cassini test results. United States. https://doi.org/10.1063/1.51981
Kelly, C Edward, and Klee, Paul M. 1997. "RTG performance on Galileo and Ulysses and Cassini test results". United States. https://doi.org/10.1063/1.51981.
@article{osti_21165725,
title = {RTG performance on Galileo and Ulysses and Cassini test results},
author = {Kelly, C Edward and Klee, Paul M},
abstractNote = {Power output from telemetry for the two Galileo RTGs are shown from the 1989 launch to the recent Jupiter encounter. Comparisons of predicted, measured and required performance are shown. Similar comparisons are made for the RTG on the Ulysses spacecraft which completed its planned mission in 1995. Also presented are test results from small scale thermoelectric modules and full scale converters performed for the Cassini program. The Cassini mission to Saturn is scheduled for an October 1997 launch. Small scale module test results on thermoelectric couples from the qualification and flight production runs are shown. These tests have exceeded 19,000 hours are continuing to provide increased confidence in the predicted long term performance of the Cassini RTGs. Test results are presented for full scale units both ETGs (E-6, E-7) and RTGs (F-2, F-5) along with mission power predictions. F-5, fueled in 1985, served as a spare for the Galileo and Ulysses missions and plays the same role in the Cassini program. It has successfully completed all acceptance testing. The ten years storage between thermal vacuum tests is the longest ever experienced by an RTG. The data from this test are unique in providing the effects of long term low temperature storage on power output. All ETG and RTG test results to date indicate that the power requirements of the Cassini spacecraft will be met. BOM and EOM power margins of at least five percent are predicted.},
doi = {10.1063/1.51981},
url = {https://www.osti.gov/biblio/21165725}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 387,
place = {United States},
year = {1997},
month = {1}
}