Comparison of on-orbit and ground based hollow cathode operation / Christian Carpenter.

Format:

Book

Conference/Event

Government document

Contributor:

QSS Group, Inc.

United States. National Aeronautics and Space Administration

NASA Glenn Research Center

Conference Name:

Joint Propulsion Conference and Exhibit (38th : 2002 : Indianapolis, Ind.)

Series:

NASA contractor report ; NASA CR-2003-211817.

NASA/CR ; 2003-211817

Language:

English

Subjects (All):

Electric contactors.

Plasma (Ionized gases).

Cathodes.

Space plasmas.

Electrodes.

Medical Subjects:

Electrodes.

Physical Description:

1 online resource (11 pages) : illustrations

Place of Publication:

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

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."

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

Includes bibliographical references (pages 3-4).

"AIAA-2002-4098."

Other Format:

Microfiche version: Carpenter, Christian. Comparison of on-orbit and ground based hollow cathode operation

OCLC:

191699468