Zobrazeno 1 - 10
of 17
pro vyhledávání: '"Michael J. Sekerak"'
Publikováno v:
Journal of Propulsion and Power. 32:903-917
Mode transitions in a 6 kW laboratory Hall-effect thruster were induced by varying the magnetic field intensity while holding all other operating parameters constant. Ultrafast imaging, discharge current, and thrust measurements were used to characte
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9832f1c60ced17df77f2447cda84fa1e
https://doi.org/10.2514/1.b35709
https://doi.org/10.2514/1.b35709
Autor:
Lee F. Johnson, Robert B. Lobbia, Wensheng Huang, Maria Choi, David G. Conroy, Maria de Soria-Santacruz Pich, Michael J. Sekerak
Publikováno v:
2018 IEEE Aerospace Conference.
NASA's Asteroid Redirect Robotic Mission (ARRM) mission concept plans included a set of plasma and space environment instruments, the Plasma Diagnostic Package (PDP), to fulfill ARRM requirements for technology extensibility to future missions. The P
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0a210a8856ec77dddcb3bde410659a5c
https://doi.org/10.1109/aero.2018.8396825
https://doi.org/10.1109/aero.2018.8396825
Autor:
Michael J. Sekerak, Alec D. Gallimore, James E. Polk, Benjamin W. Longmier, Daniel L. Brown, Richard R. Hofer
Publikováno v:
IEEE Transactions on Plasma Science. 43:72-85
Spokes are azimuthally propagating perturbations in the plasma discharge of Hall effect thrusters (HETs) that travel in the $E \times B$ direction. The mechanisms for spoke formation are unknown, but their presence has been associated with improved t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::84978552be879c87cb29bc6f205fcd98
https://doi.org/10.1109/tps.2014.2355223
https://doi.org/10.1109/tps.2014.2355223
Publikováno v:
52nd AIAA/SAE/ASEE Joint Propulsion Conference.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6f88841e9c6d810ef5a5bd20ebf54a3d
https://doi.org/10.2514/6.2016-4827
https://doi.org/10.2514/6.2016-4827
Autor:
Hani Kamhawi, Michael J. Sekerak, George J. Williams, Richard R. Hofer, Daniel A. Herman, Ioannis G. Mikellides, Timothy R. Sarver-Verhey, James E. Polk
Publikováno v:
52nd AIAA/SAE/ASEE Joint Propulsion Conference.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7e395c81812c19b6f5311a186ffa2fda
https://doi.org/10.2514/6.2016-4825
https://doi.org/10.2514/6.2016-4825
Publikováno v:
Scopus-Elsevier
NASA’s Dawn spacecraft entered orbit around the dwarf planet Ceres on March 6, 2015 thereby becoming the first mission to orbit two celestial bodies outside of the Earth-moon system. This feat was made possible due to the use of electric propulsion
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0ade39b290af4f25a6ae189068577c06
https://doi.org/10.2514/6.2016-5024
https://doi.org/10.2514/6.2016-5024
Autor:
Richard R. Hofer, Alejandro Lopez Ortega, Christopher A. Dodson, Benjamin Jorns, Dan M. Goebel, Michael J. Sekerak, John R. Anderson, Ioannis G. Mikellides
Publikováno v:
52nd AIAA/SAE/ASEE Joint Propulsion Conference.
The mechanisms contributing to the erosion of the inner magnetic pole of a 6-kW magnetically shielded Hall thruster are experimentally and numerically investigated. Sputtering from ion bombardment is believed to be the cause of this wear, but the nat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e4a54ab3031e55f22a038b2d45bfb3fb
https://doi.org/10.2514/6.2016-4839
https://doi.org/10.2514/6.2016-4839
Autor:
Walter Santiago, James E. Polk, Michael J. Sekerak, Richard R. Hofer, Hani Kamhawi, John Steven Snyder, Daniel A. Herman
Publikováno v:
52nd AIAA/SAE/ASEE Joint Propulsion Conference.
The Asteroid Redirect Robotic Mission is a Solar Electric Propulsion Technology Demonstration Mission (ARRM) whose main objectives are to develop and demonstrate a high-power solar electric propulsion capability for the Agency and return an asteroida
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d4b766951f20a5f5fbf7629f4a29b039
https://doi.org/10.2514/6.2016-4824
https://doi.org/10.2514/6.2016-4824
Publikováno v:
Journal of Applied Physics. 125:033302
Magnetic shielding of Hall thrusters has been shown to reduce erosion of the channel walls by at least a few orders of magnitude, thereby enabling the use of these devices in deep space missions. Wear tests of magnetically shielded thrusters, such as
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3eae7d58230ca3d41752b3eca065f865
https://doi.org/10.1063/1.5077097
https://doi.org/10.1063/1.5077097
Autor:
Hani Kamhawi, Richard R. Hofer, Benjamin W. Longmier, James E. Polk, Benjamin Jorns, Alec D. Gallimore, Michael J. Sekerak, Wensheng Huang
Publikováno v:
50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference.
A mode transition study is conducted in magnetically shielded thrusters where the magnetic field magnitude is varied to induce mode transitions. Three different oscillatory modes are identified with the 20-kW NASA-300MS-2 and the 6-kW H6MS: Mode 1) g
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a4ee0b43fe2daea5e61a3ca2dad35c0a
https://doi.org/10.2514/6.2014-3511
https://doi.org/10.2514/6.2014-3511