Zobrazeno 1 - 6
of 6
pro vyhledávání: '"Timothy R. Verhey"'
Autor:
Gabriel F. Benavides, Corey R. Rhodes, Timothy R. Verhey, Jonathan A. Mackey, Hani Kamhawi, T.K. Gray, Naia I. Butler-Craig, Thomas Liu, Arthur G. Birchenough, James L. Myers, John T. Yim, Luis R. Pinero
Publikováno v:
AIAA Propulsion and Energy 2019 Forum.
This paper describes recent progress at the NASA Glenn Research Center (GRC) in the development and demonstration of an integrated high-propellant throughput small spacecraft electric propulsion (HT-SSEP) system based on a Hall-effect thruster. A cen
Publikováno v:
AIAA Propulsion and Energy 2019 Forum.
After successful validation of the design, swaged cathode heaters have been delivered by the NASA Glenn Research Center to Aerojet Rocketdyne for the fabrication of the NEXT-C ion thruster . NASA Glenn Research Center re-established and validated pro
Autor:
James E. Polk, Ioannis G. Mikellides, Hani Kamhawi, Robert E. Thomas, John T. Yim, Rohit Shastry, Thomas W. Haag, Lauren Clayman, Timothy R. Verhey, Christopher Griffith, Richard R. Hofer, Wensheng Huang, Daniel A. Herman, George J. Williams, Li Chang, Dan M. Goebel, James L. Myers
Publikováno v:
50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference.
NASA is developing mission concepts for a solar electric propulsion technology demonstration mission. A number of mission concepts are being evaluated including ambitious missions to near Earth objects. The demonstration of a high-power solar electri
Publikováno v:
27th Joint Propulsion Conference.
Four hollow cathode electron sources were analyzed via boroscopy, scanning electron microscopy, energy dispersive x ray analysis, and x ray diffraction analysis. These techniques were used to develop a preliminary understanding of the chemistry of th
Publikováno v:
21st International Electric Propulsion Conference.
The results of the first life test of a high power ring-cusp ion thruster are presented. A 30-cm laboratory model thruster was operated steady-state at a nominal beam power of 5 kW on xenon propellant for approximately 900 hours. This test was conduc
Autor:
Gregory S. Macrae, Timothy R. Verhey
Publikováno v:
21st International Electric Propulsion Conference.
An experimental investigation was initiated to establish conditioning procedures for reliable hollow cathode operation via the characterization of critical parameters in a representative cathode test facility. From vacuum pumpdown rates, it was found