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Comparison of on-orbit and ground based hollow cathode operation

Author: QSS Group, Inc.; United States. National Aeronautics and Space Administration.; NASA Glenn Research Center.
Publisher: [Cleveland, Ohio] : National Aeronautics and Space Administration, Glenn Research Center, [2003]
Series: NASA contractor report, NASA CR-2003-211817.
Edition/Format:   eBook : Document : National government publication : EnglishView all editions and formats
Database:WorldCat
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  Read more...
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Additional Physical Format: Microfiche version:
Carpenter, Christian.
Comparison of on-orbit and ground based hollow cathode operation
(OCoLC)226271420
Material Type: Document, Government publication, National government publication, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: QSS Group, Inc.; United States. National Aeronautics and Space Administration.; NASA Glenn Research Center.
OCLC Number: 191699468
Notes: Title from title screen (viewed January 21, 2008).
"August 2003."
"Prepared for the 38th Joint Propulsion Conference and Exhibit cosponsored by AIAA, ASME, SAE, and ASEE Indianapolis, Indiana, July 7-10, 2002."
"Performing organization, QSS Group, Inc."--Report documentation page.
"AIAA-2002-4098."
Description: 1 online resource (11 pages) : illustrations.
Details: Mode of access: World Wide Web.
Series Title: NASA contractor report, NASA CR-2003-211817.
Responsibility: Christian Carpenter.

Abstract:

"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."

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