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Titanium Optics For Ion Thrusters
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Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781724041883 Total Pages :36 pages Book Rating :4.0/5 (418 download)
Book Synopsis Titanium Optics for Ion Thrusters by : National Aeronautics and Space Adm Nasa
Download or read book Titanium Optics for Ion Thrusters written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-09-26 with total page 36 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
Book Synopsis Titanium Optics for Ion Thrusters by :
Download or read book Titanium Optics for Ion Thrusters written by and published by . This book was released on 1999 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Titanium Optics for Ion Thrusters by : George Chris Soulas
Download or read book Titanium Optics for Ion Thrusters written by George Chris Soulas and published by . This book was released on 1999 with total page 9 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 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 Evaluation of Titanium Ion Optics for the Nasa 30 Cm Ion Thruster ... Nasa by : United States. National Aeronautics and Space Administration
Download or read book Performance Evaluation of Titanium Ion Optics for the Nasa 30 Cm Ion Thruster ... 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 Ion Optics for High Power 50-cm-diam Ion Thrusters by : Vincent K. Rawlin
Download or read book Ion Optics for High Power 50-cm-diam Ion Thrusters written by Vincent K. Rawlin and published by . This book was released on 1989 with total page 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 Translation Optics for 30 Cm Ion Engine Thrust Vector Control by :
Download or read book Translation Optics for 30 Cm Ion Engine Thrust Vector Control written by and published by . This book was released on 2002 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance Evaluation of 40 Cm Ion Optics for the NEXT Ion Engine by :
Download or read book Performance Evaluation of 40 Cm Ion Optics for the NEXT Ion Engine written by and published by . This book was released on 2002 with total page 19 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:
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 Development and Testing of Carbon-based Ion Optics for 30cm Ion Thrusters by : John S. Snyder
Download or read book Development and Testing of Carbon-based Ion Optics for 30cm Ion Thrusters written by John S. Snyder and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulation of Ion Thruster Optics by :
Download or read book Numerical Simulation of Ion Thruster Optics written by and published by . This book was released on 2003 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 :9781721288908 Total Pages :40 pages Book Rating :4.2/5 (889 download)
Book Synopsis Design and Performance of 40 Cm Ion Optics by : National Aeronautics and Space Administration (NASA)
Download or read book Design and Performance of 40 Cm 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 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: A 40 cm ion thruster is being developed at the NASA Glenn Research Center to obtain input power and propellant throughput capabilities of 10 kW and 550 kg. respectively. The technical approach here is a continuation of the "derating" technique used for the NSTAR ion thruster. The 40 cm ion thruster presently utilizes the NSTAR ion optics aperture geometry to take advantage of the large database of lifetime and performance data already available. Dome-shaped grids were chosen for the design of the 40 cm ion optics because this design is naturally suited for large-area ion optics. Ion extraction capabilities and electron backstreaming limits for the 40 cm ion optics were estimated by utilizing NSTAR 30 cm ion optics data. A preliminary service life assessment showed that the propellant throughput goal of 550 kg of xenon may be possible with molybdenum 40 cm ion optics. One 40 cm ion optics' set has been successfully fabricated to date. Additional ion optics' sets are presently being fabricated. Preliminary performance tests were conducted on a laboratory model 40 cm ion thruster. Soulas, George C. Glenn Research Center; Marshall Space Flight Center NASA/TM-2001-211275, E-13074, IEPC-01-090, NAS 1.15:211275
Book Synopsis 36th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit: 2000-3800 - 2000-3849 by :
Download or read book 36th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit: 2000-3800 - 2000-3849 written by and published by . This book was released on 2000 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722806453 Total Pages :30 pages Book Rating :4.8/5 (64 download)
Book Synopsis Structural and Thermal Response of 30 Cm Diameter Ion Thruster Optics by : National Aeronautics and Space Administration (NASA)
Download or read book Structural and Thermal Response of 30 Cm Diameter Ion Thruster Optics written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-11 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tabular and graphical data are presented which are intended for use in calibrating and validating structural and thermal models of ion thruster optics. A 30 cm diameter, two electrode, mercury ion thruster was operated using two different electrode assembly designs. With no beam extraction, the transient and steady state temperature profiles and center electrode gaps were measured for three discharge powers. The data showed that the electrode mount design had little effect on the temperatures, but significantly impacted the motion of the electrode center. Equilibrium electrode gaps increased with one design and decreased with the other. Equilibrium displacements in excess of 0.5 mm and gap changes of 0.08 mm were measured at 450 W discharge power. Variations in equilibrium gaps were also found among assemblies of the same design. The presented data illustrate the necessity for high fidelity ion optics models and development of experimental techniques to allow their validation. Macrae, G. S. and Zavesky, R. J. and Gooder, S. T. Glenn Research Center RTOP 506-42-31...
