Zobrazeno 1 - 10
of 29
pro vyhledávání: '"John T. Yim"'
Publikováno v:
Journal of Applied Physics. 130:113302
The effect of facility background pressure on the operation of a hollow cathode in a Hall thruster-like axial magnetic field is experimentally characterized. Facility pressure was varied between 10 and 88 μTorr-Xe using a secondary flow of xenon int
Publikováno v:
Journal of Propulsion and Power. 33:668-680
The electric propulsion community has been implored to establish and implement a set of universally applicable test standards during the research, development, and qualification of electric propulsion systems. Variability between facility-to-facility
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
Autor:
John T. Yim, Maria Choi
Publikováno v:
2018 Joint Propulsion Conference.
Autor:
Maria Choi, John T. Yim
Publikováno v:
2018 Joint Propulsion Conference.
A 3-D electron fluid model has been developed as a steping stone to fully describe the electron current flow across magnetic fields inside a vacuum chamber and to provide electron flux to solar arrays for spacecraft surface charging model. A detailed
Autor:
John T. Yim, Ira Katz, Vernon H. Chaplin, John R. Anderson, George C. Soulas, George J. Williams, James E. Polk
Publikováno v:
2018 Joint Propulsion Conference.
Accelerator (accel) grid sputtering by ions formed through charge-exchange (CEX) reactions between beam ions and residual neutral gas is a critical life-limiting mechanism for gridded ion thrusters. The three-dimensional ion optics code CEX3D is desi
Autor:
Wensheng Huang, Peter Y. Peterson, Hani Kamhawi, John T. Yim, Daniel A. Herman, Richard R. Hofer, James H. Gilland, George J. Williams
Publikováno v:
52nd AIAA/SAE/ASEE Joint Propulsion Conference.
The NASA Hall Effect Rocket with Magnetic Shielding (HERMeS) 12.5 kW Technology Demonstration Unit-1 (TDU-1) Hall thruster has been the subject of extensive technology maturation in preparation for development into a flight ready propulsion system. P
Autor:
Wensheng Huang, Peter Y. Peterson, George J. Williams, John T. Yim, Thomas W. Haag, Chad Joppeck, James H. Gilland, Hani Kamhawi, Michael W. Swiatek
Publikováno v:
52nd AIAA/SAE/ASEE Joint Propulsion Conference.
Autor:
Hani Kamhawi, James H. Gilland, John T. Yim, Daniel A. Herman, Ioannis G. Mikellides, Thomas W. Haag, George J. Williams, Richard R. Hofer, Wensheng Huang, Peter Y. Peterson
Publikováno v:
52nd AIAA/SAE/ASEE Joint Propulsion Conference.
NASA's Hall Effect Rocket with Magnetic Shielding (HERMeS) 12.5 kW Technology Demonstration Unit-1 (TDU-1) has been the subject of extensive technology maturation in preparation for flight system development. Part of the technology maturation effort
Publikováno v:
52nd AIAA/SAE/ASEE Joint Propulsion Conference.
In support of wear testing for the Hall Effect Rocket with Magnetic Shielding (HERMeS) program, the back sputter from a Hall effect thruster plume has been modeled for the NASA Glenn Research Centers Vacuum Facility 5. The predicted wear at a near-wo