Zobrazeno 1 - 10
of 13
pro vyhledávání: '"M. A. Mantenieks"'
Publikováno v:
Journal of Spacecraft and Rockets. 13:579-584
Fluctuations of the discharge and beam plasmas of a 30-cm ion thruster have been measured using 60-Hz laboratory-type power supplies. The thruster was operated at beam currents of 2.0,1.5, and 1.0 A over a range of magnetic baffle currents, at consta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::11ba81329e232f17091fcfe615f5a8a1
https://doi.org/10.2514/3.57122
https://doi.org/10.2514/3.57122
Autor:
M. A. Mantenieks
Publikováno v:
16th International Electric Propulsion Conference.
A slightly modified 8-cm Hg ion thruster demonstrated significant increase in performance. Thrust was increased by almost a factor of five over that of the baseline thruster. Thruster operation with various three grid ion optics configurations; thrus
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b9220ba218568a1e43b8aaa3068e3071
https://doi.org/10.2514/6.1982-1913
https://doi.org/10.2514/6.1982-1913
Autor:
M. A. Mantenieks, V. K. Rawlin
Publikováno v:
11th Electric Propulsion Conference.
The 3.0-m diameter chamber of the 7.6-m diameter by 21.4-m long vacuum tank at NASA LeRC was modified to permit testing of an array of up to six 30-cm thrusters with a variety of laboratory and thermal vacuum bread-board power systems. A primary obje
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5624b7dd52ddc146454d60ab2a90dfb2
https://doi.org/10.2514/6.1975-402
https://doi.org/10.2514/6.1975-402
Publikováno v:
International Electric Propulsion Conference.
A major life-limiting phenomenon of electric thrusters is the sputter erosion of discharge chamber components. Thrusters for space propulsion are required to operate for extended periods of time, usually in excess of 10,000 hr. Lengthy and very costl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::782f619a96639452b1140a99d0c3f36d
https://doi.org/10.2514/6.1985-2011
https://doi.org/10.2514/6.1985-2011
Autor:
M. A. Mantenieks
Publikováno v:
15th International Electric Propulsion.
A preliminary characterization of the performance capabilities of the 8-cm thruster in order to initiate an evaluation of its application to LSS propulsion requirements is presented. With minor thruster modifications, the thrust was increased by abou
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d2453a489dfea44e2886288c89cb7bbb
https://doi.org/10.2514/6.1981-754
https://doi.org/10.2514/6.1981-754
Autor:
E. G. Wintucky, M. A. Mantenieks
Publikováno v:
13th International Electric Propulsion Conference.
An accelerated cycle test was conducted in which an 8-cm Engineering Model Thruster (EMT) prototype successfully completed 5200 on-off cycles and a total of more than 1300 hours of thruster operation at a 4.5 mN thrust level. Cathode tip heater power
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6924efd9e7911eab962ae18ed98eb4af
https://doi.org/10.2514/6.1978-649
https://doi.org/10.2514/6.1978-649
Autor:
M. A. Mantenieks, V. K. Rawlin
Publikováno v:
14th International Electric Propulsion Conference.
Ground-based tests of Hg ion thrusters have identified sputter erosion of thruster components as one of the main life limiting phenomena. Subsequent measurements have revealed that sputtering rates can be affected by background gases at pressures as
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f299cc270e37647da0b9cceec39dba0e
https://doi.org/10.2514/6.1979-2061
https://doi.org/10.2514/6.1979-2061
Autor:
V. K. Rawlin, M. A. Mantenieks
Publikováno v:
12th International Electric Propulsion Conference.
Sputtering and deposition rates were measured for discharge chamber components of a 30-cm diameter mercury ion thruster. It was found that sputtering rates of the screen grid and cathode baffle were strongly affected by geometry of the baffle holder.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b3afb6bfd8c9b2a9f227cc0df888cd49
https://doi.org/10.2514/6.1976-988
https://doi.org/10.2514/6.1976-988
Autor:
M. A. Mantenieks
Publikováno v:
12th International Electric Propulsion Conference.
Results are presented of several 30 cm diameter mercury ion thruster isolator life tests that show that the onset and exponential increase of leakage current problems observed in earlier thruster operations and isolator tests have been solved. A 10,0
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a12c8d2589f3c8cb1be35a02b39292d9
https://doi.org/10.2514/6.1976-1027
https://doi.org/10.2514/6.1976-1027
Autor:
V. K. Rawlin, M. A. Mantenieks
Publikováno v:
11th Electric Propulsion Conference.
Initial studies have been made of the sputtering and deposition phenomena in a 30-cm thruster. Sputtering rates, of the cathode baffle, one of the main sources of sputtered material in a thruster, have beem measured by weight loss as a function of se
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3eea15f5db1ee4119df46a0ad6a17a8a
https://doi.org/10.2514/6.1975-400
https://doi.org/10.2514/6.1975-400