Download or read book On the Operational Status of the ISS Plasma Contactor Hollow Cathodes written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-21 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Plasma Contactor Unit (PCU) was developed by the Rocketdyne division of The Boeing Company to control charging of the International Space Station (ISS). Each PCU contains a Hollow Cathode Assembly (HCA), which emits the charge control electrons. The HCAs were designed and fabricated at NASA s Glenn Research Center (GRC). GRC's HCA development program included manufacture of engineering, qualification, and flight model HCAs as well as qualification and wear tests. GRC tracks the on-orbit data for the flight HCAs in order to ascertain their overall health. As of April 5, 2004, 43 ignitions and over 6000 hours have been accumulated on a single unit. The flight HCAs continue to operate flawlessly. This paper will discuss the operation of the HCAs during ground tests and on-orbit operation from initial startup to April 30, 2004. Burke, Thomas P. (Technical Monitor) and Carpenter, Christian B. Glenn Research Center NASA/CR-2004-213184, AIAA Paper 2004-3425, E-14680

Download or read book Operational status of the International Space Station plasma contactor hollow cathode assemblies from July 2011 to May 2013 written by Hani Kamhawi and published by . This book was released on 2014 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Status of Hollow Cathode Heater Development for the Space Station Plasma Contactor written by George C. Soulas and published by . This book was released on 1994 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Review of Testing of Hollow Cathodes for the International Space Station Plasma Contactor written by and published by . This book was released on 2001 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Correlation of Hollow Cathode Assembly and Plasma Contactor Data from Ground Testing and In Space Operation on the International Space Station written by and published by . This book was released on 2001 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hollow Cathode Heater Development for the Space Station Plasma Contactor written by and published by . This book was released on 1993 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Plasma Contactor Development for Space Station written by and published by . This book was released on 1993 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Functional Testing of the Space Station Plasma Contactor written by Michael J. Patterson and published by . This book was released on 1995 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comparison of On Orbit and Ground Based Hollow Cathode Operation written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-20 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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. Patterson, Michael (Technical Monitor) and Carpenter, Christian Glenn Research Center NASA/CR-2003-211817, E-13510, NAS 1.26:211817, AIAA Paper 2002-4098

Download or read book Multiple Hollow Cathode Wear Testing for the Space Station Plasma Contactor written by George C. Soulas and published by . This book was released on 1994 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Electrostatic Phenomena on Planetary Surfaces written by Carlos I Calle and published by Morgan & Claypool Publishers. This book was released on 2017-03-15 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: The diverse planetary environments in the solar system react in somewhat different ways to the encompassing influence of the Sun. These different interactions define the electrostatic phenomena that take place on and near planetary surfaces. The desire to understand the electrostatic environments of planetary surfaces goes beyond scientific inquiry. These environments have enormous implications for both human and robotic exploration of the solar system. This book describes in some detail what is known about the electrostatic environment of the solar system from early and current experiments on Earth as well as what is being learned from the instrumentation on the space exploration missions (NASA, European Space Agency, and the Japanese Space Agency) of the last few decades. It begins with a brief review of the basic principles of electrostatics.

Download or read book Plasma Contactor Technology for Space Station Freedom written by Michael J. Patterson and published by . This book was released on 1993 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Discharge Ignition Behavior of the Space Station Plasma Contactor written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-16 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ignition testing of hollow cathode assemblies being developed for the Space Station plasma contactor system has been initiated to validate reliable multiple restart capability. An ignition approach was implemented that was derived from an earlier arcjet program that successfully demonstrated over 11,600 ignitions. For this, a test profile was developed to allow accelerated cyclic testing at expected operating conditions. To date, one hollow cathode assembly has been used to demonstrate multiple ignitions. A prototype hollow cathode assembly has achieved 3,615 successful ignitions at a nominal anode voltage of 18.0 V. During the ignition testing several parameters were investigated, of which the heater power and pre-heat time were the only parameters found to significantly impact ignition rate. Sarver-Verhey, Timothy R. and Hamley, John A. Glenn Research Center NASA-TM-106925, E-9643, NAS 1.15:106925, AIAA PAPER 94-3311 RTOP 478-43-00...

Download or read book Comparison of On Orbit and Ground Based Hollow Cathode Operation written by and published by . This book was released on 2003 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Space Station Cathode Ignition Test Status at 32 000 Cycles written by and published by . This book was released on 1997 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 41st AIAA ASME SAE ASEE Joint Propulsion Conference Exhibit 10 13 July 2005 Tucson Arizona 05 3650 05 3699 written by and published by . This book was released on 2005 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Discharge Ignition Behavior of the Space Station Plasma Contactor written by Timothy R. Sarver-Verhey and published by . This book was released on 1995 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: