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Radiation Dose Testing on Juno High Voltage CablesThe Juno mission to Jupiter will have a highly elliptical orbit taking the spacecraft through the radiation belts surrounding the planet. During these passes through the radiation belts, the spacecraft will be subject to high doses of radiation from energetic electrons and protons with energies ranging from 10 keV to 1 GeV. While shielding within the spacecraft main body will reduce the total absorbed dose to much of the spacecraft electronics, instruments and cables on the outside of the spacecraft will receive much higher levels of absorbed dose. In order to estimate the amount of degradation to two such cables, testing has been performed on two coaxial cables intended to provide high voltages to three of the instruments on Juno. Both cables were placed in a vacuum of 5x10-6 torr and cooled to -50 C prior to exposure to the radiation sources. Measurements of the coaxial capacitance per unit length and partial discharge noise floor indicate that increasing levels of radiation make measurable but acceptably small changes to the F EP Teflon utilized in the construction of these cables. In addition to the radiation dose testing, observations were made on the internal electrostatic charging characteristics of these cables and multiple discharges were recorded.
Document ID
20100032945
Acquisition Source
Jet Propulsion Laboratory
Document Type
Presentation
External Source(s)
Authors
Green, Nelson W.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Kirkham, Harold
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Kim, Wousik
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
McAlpine, Bill
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 25, 2013
Publication Date
December 24, 2008
Subject Category
Space Radiation
Meeting Information
Meeting: 47th AIAA Aerospace Sciences Meeting Including The New Horizons Forum and Aerospace Exposition
Location: Orlando, FL
Country: United States
Start Date: January 5, 2009
End Date: January 8, 2009
Sponsors: American Inst. of Aeronautics and Astronautics
Distribution Limits
Public
Copyright
Other
Keywords
Juno
partial discharge
high voltage
radiation

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