Description |
1 online resource (11 pages) illustrations |
Series |
NASA/CR ; 2003-211817 |
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NASA contractor report ; NASA CR-2003-211817.
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System Details |
Mode of access: World Wide Web. |
Type Of Report |
Final contractor report. |
Note |
Title from title screen (viewed January 21, 2008). |
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"August 2003" |
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"Prepared for the 38th Joint Propulsion Conference and Exhibit cosponsored by AIAA, ASME, SAE, and ASEE Indianapolis, Indiana, July 7-10, 2002." |
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"Performing organization, QSS Group, Inc."--Rept. documentation p. |
Bibliography |
Includes bibliographical references (p. 3-4). |
Summary |
"The Plasma Contactor Units (PCUs) were developed at NASA Glenn Research Center (GRC) and Boeing for charge control on board the International Space Station (ISS). Since the first ignition of a PCU on 10 16 2000 over 3,900 hours of operation have been demonstrated on a single unit. In order to guarantee that the PCUs hollow cathode assemblies (HCAs), which emit the electrons used for charge control, would satisfy the life requirement of 18,000 hours, a ground based hollow cathode life test program was initiated at GRC. The life test program aimed at 27,000 hours of operation on a single unit to demonstrate the industry standard 1.5 times operational life requirement. As of this printing, over 18,000 hours of operation have been accumulated on a single hollow cathode. By comparing the data received from the on-orbit HCAs to the data obtained for the life test cathodes, a comparison may be drawn to determine if the on-orbit HCAs are operating normally, with a final goal of predicting lifetime. Based on the data taken thus far, it can be concluded that the on-orbit HCAs are operating within their design specifications." |
Funding |
Sponsored by National Aeronautics and Space Administration NAS3-00145 WU-575-15-6940 E-13510 |
Note |
"AIAA-2002-4098" |
Subject |
Electric contactors.
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Plasma (Ionized gases)
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Cathodes.
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Space plasmas.
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Hollow cathodes.
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International space station.
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Onboard equipment.
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Contactors.
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Ground tests.
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Space plasmas.
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Electron plasma.
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Added Author |
QSS Group, Inc.
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United States. National Aeronautics and Space Administration.
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NASA Glenn Research Center.
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Joint Propulsion Conference and Exhibit (38th : 2002 : Indianapolis, Ind.)
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Gpo Item No. |
0830-H-14 (online) |
Sudoc No. |
NAS 1.26:211817 |
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