Actions for On-Orbit Daytime Solar Heating Effects : A Comparison of Ground Chamber Arcing Results

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On-Orbit Daytime Solar Heating Effects : A Comparison of Ground Chamber Arcing Results

Author
Galofaro, J.
Published
March 2004.
Physical Description
1 electronic document
Additional Creators
Vayner, B. and Ferguson, D.
Online Version

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Unclassified, Unlimited, Publicly available.
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Summary
The purpose of the current experiment is to make direct comparisons between the arcing results obtained from the diffusion pumped vertical chamber and our newly renovated Teney vacuum chamber which is equipped with a cryogenic pump. Recall that the prior reported results obtained for the Vertical chamber were nominal at best, showing only a slight reduction in the arc rate after five heating cycles at the lower bias potentials and virtually no changes at high potential biases. It was concluded that the vertical chamber was unable to remove enough water vapor from the chamber to adequately test the arcing criterion. Because the cryo-pumped Teney chamber has a ten times better pumping speed, (40,000 liters per sec compared to 4,000 liters per sec for the diffusion pumped vertical chamber), a decision was made to retest that experiment in both the Teney and Vertical vacuum chambers. A comparison of the various data is presented with encouraging results.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 20040111103.
8th Spacecraft Charging Technology Conference; NASA/CP-2004-213091.
Terms of Use and Reproduction
No Copyright.
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