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Improving The Total Impulse Capability Of The Nstar Ion Thruster With Thick Accelerator Grid Ion Optics
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Book Synopsis Improving the Total Impulse Capability of the Nstar Ion Thruster with Thick-accelerator-grid Ion Optics ... Nasa by : United States. National Aeronautics and Space Administration
Download or read book Improving the Total Impulse Capability of the Nstar Ion Thruster with Thick-accelerator-grid Ion Optics ... Nasa written by United States. National Aeronautics and Space Administration and published by . This book was released on 2003* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Improving the Total Impulse Capability of the NSTAR Ion Thruster With Thick-Accelerator-Grid Ion Optics by :
Download or read book Improving the Total Impulse Capability of the NSTAR Ion Thruster With Thick-Accelerator-Grid Ion Optics written by and published by . This book was released on 2001 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721284504 Total Pages :36 pages Book Rating :4.2/5 (845 download)
Book Synopsis Improving the Total Impulse Capability of the Nstar Ion Thruster with Thick-Accelerator-Grid Ion Optics by : National Aeronautics and Space Administration (NASA)
Download or read book Improving the Total Impulse Capability of the Nstar Ion Thruster with Thick-Accelerator-Grid Ion Optics written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-19 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of performance tests with thick-accelerator-grid (TAG) ion optics are presented. TAG ion optics utilize a 50 percent thicker accelerator grid to double ion optics' service life. NSTAR ion optics were also tested to provide a baseline performance for comparison. Impingement-limited total voltages for the TAG ion optics were only 0 to 15 V higher than those of the NSTAR ion optics. Electron backstreaming limits for the TAG ion optics were 3 to 9 V higher than those for the NSTAR optics due to the increased accelerator grid thickness for the TAG ion optics. Screen grid ion transparencies for the TAG ion optics were only about 2 percent lower than those for the NSTAR optics, reflecting the lower physical screen grid open area fraction of the TAG ion optics. Accelerator currents for the TAG ion optics were 19 to 43 percent greater than those for the NSTAR ion optics due, in part, to a sudden increase in accelerator current during TAG ion optics' performance tests for unknown reasons and to the lower-than-nominal accelerator aperture diameters. Beam divergence half-angles that enclosed 95 percent of the total beam current and beam divergence thrust correction factors for the TAG ion optics were within 2 degrees and 1 percent, respectively, of those for the NSTAR ion optics. Soulas, George C. Glenn Research Center; Jet Propulsion Laboratory; Marshall Space Flight Center NASA/TM-2001-211276, NAS 1.15:211276, E-13075
Book Synopsis Ion Propulsion for Spacecraft by : Lewis Research Center
Download or read book Ion Propulsion for Spacecraft written by Lewis Research Center and published by . This book was released on 1977 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scaling of Ion Thrusters to Low Power by :
Download or read book Scaling of Ion Thrusters to Low Power written by and published by . This book was released on 1998 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development Status of the NASA 30-cm Ion Thruster and Power Processor by :
Download or read book Development Status of the NASA 30-cm Ion Thruster and Power Processor written by and published by . This book was released on 1994 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ion Engine and Hall Thruster Development at the NASA Glenn Research Center by :
Download or read book Ion Engine and Hall Thruster Development at the NASA Glenn Research Center written by and published by . This book was released on 2002 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ion Thruster Development at NASA Lewis Research Center by :
Download or read book Ion Thruster Development at NASA Lewis Research Center written by and published by . This book was released on 1992 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ion and Electron Transport in an NSTAR-Derivative Ion Thruster by :
Download or read book Ion and Electron Transport in an NSTAR-Derivative Ion Thruster written by and published by . This book was released on 2001 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721199846 Total Pages :34 pages Book Rating :4.1/5 (998 download)
Book Synopsis Titanium Optics for Ion Thrusters by : National Aeronautics and Space Administration (NASA)
Download or read book Titanium Optics for Ion Thrusters written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-15 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ion thruster total impulse capability is limited, in part, by accelerator grid sputter erosion. A development effort was initiated to identify a material with a lower accelerator grid volumetric sputter erosion rate than molybdenum, but that could utilize the present NSTAR thruster grid design and fabrication techniques to keep development costs low, and perform as well as molybdenum optics. After comparing the sputter erosion rates of several atomic materials to that of molybdenum at accelerator voltages, titanium was found to offer a 45% reduction in volumetric erosion rates. To ensure that screen grid sputter erosion rates are not higher at discharge chamber potentials, titanium and molybdenum sputter erosion rates were measured at these potentials. Preliminary results showed only a slightly higher volumetric erosion rate for titanium, so that screen grid erosion is insignificant. A number of material, thermal, and mechanical properties were also examined to identify any fabrication, launch environment, and thruster operation issues. Several titanium grid sets were successfully fabricated. A titanium grid set was mounted onto an NSTAR 30 cm engineering model ion thruster and tested to determine optics performance. The titanium optics operated successfully over the entire NSTAR power range of 0.5 to 2.3 kW. Differences in impingement-limited perveances and electron backstreaming limits were found to be due to a larger cold gap for the titanium optics. Discharge losses for titanium grids were lower than those for molybdenum, likely due to a slightly larger titanium screen grid open area fraction. Radial distributions of beam current density with titanium optics were very similar to those with molybdenum optics at all power levels. Temporal electron backstreaming limit measurements showed that titanium optics achieved thermal equilibrium faster than molybdenum optics. Soulas, George C. and Haag, Thomas W. and Patterson, Michael J. and Rawlin, Vincent K. Glenn Resear
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721824007 Total Pages :32 pages Book Rating :4.8/5 (24 download)
Book Synopsis Grid Gap Measurement for an Nstar Ion Thruster by : National Aeronautics and Space Administration (NASA)
Download or read book Grid Gap Measurement for an Nstar Ion Thruster written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-24 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The change in gap between the screen and accelerator grids of an engineering model NSTAR ion optics assembly was measured during thruster operation with beam extraction. The molybdenum ion optics assembly was mounted onto an engineering model NSTAR ion thruster. The measurement technique consisted of measuring the difference in height of an alumina pin relative to the downstream accelerator grid surface. The alumina pin was mechanically attached to the center aperture of the screen grid and protruded through the center aperture of the accelerator grid. The change in pin height was monitored using a long distance microscope coupled to a digital imaging system. Transient and steady-state hot grid gaps were measured at three power levels: 0.5, 1.5 and 2.3 kW. Also, the change in grid gap was measured during the transition between power levels, and during the startup with high voltage applied just prior to discharge ignition. Performance measurements, such as perveance, electron backstreaming limit and screen grid ion transparency, were also made to confirm that this ion optics assembly performed similarly to past testing. Results are compared to a prior test of 30 cm titanium ion optics. Diaz, Esther M. and Soulas, George C. Glenn Research Center; Jet Propulsion Laboratory NASA/TM-2006-214249, E-15494, IEPC-2005-244
Book Synopsis Performance Evaluation of Titanium Ion Optics for the NASA 30 Cm Ion Thruster by :
Download or read book Performance Evaluation of Titanium Ion Optics for the NASA 30 Cm Ion Thruster written by and published by . This book was released on 2001 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance of Titanium Optics on a NASA 30 Cm Ion Thruster by : George C. Soulas
Download or read book Performance of Titanium Optics on a NASA 30 Cm Ion Thruster written by George C. Soulas and published by . This book was released on 2000 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalog of United States Government Publications by :
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 2003 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Performance of 40 Cm Ion Optics by :
Download or read book Design and Performance of 40 Cm Ion Optics written by and published by . This book was released on 2001 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Impact of Back-sputtered Carbon on the Accelerator Grid Wear Rates of the NEXT and NSTAR Ion Thrusters by : George Chris Soulas
Download or read book The Impact of Back-sputtered Carbon on the Accelerator Grid Wear Rates of the NEXT and NSTAR Ion Thrusters written by George Chris Soulas and published by . This book was released on 2013 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Low-Power Ion Thruster Development Status by :
Download or read book Low-Power Ion Thruster Development Status written by and published by . This book was released on 1999 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
