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Title Comparison of on-orbit and ground based hollow cathode operation [electronic resource] / Christian Carpenter.

Imprint [Cleveland, Ohio] National Aeronautics and Space Administration, Glenn Research Center, [2003]


Location Call No. OPAC Message Status
 Axe Federal Documents Online  NAS 1.26:211817    ---  Available
Description 1 online resource (11 pages) illustrations
Series NASA/CR ; 2003-211817
NASA contractor report ; NASA CR-2003-211817.
System Details Mode of access: World Wide Web.
Type Of Report Final contractor report.
Note 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."--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.
Plasma (Ionized gases)
Space plasmas.
Hollow cathodes.
International space station.
Onboard equipment.
Ground tests.
Space plasmas.
Electron plasma.
Added Author QSS Group, Inc.
United States. National Aeronautics and Space Administration.
NASA Glenn Research Center.
Joint Propulsion Conference and Exhibit (38th : 2002 : Indianapolis, Ind.)
Gpo Item No. 0830-H-14 (online)
Sudoc No. NAS 1.26:211817

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