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Monday, May 11, 2020 | History

4 edition of Multiple hollow cathode wear testing found in the catalog.

Multiple hollow cathode wear testing

Multiple hollow cathode wear testing

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Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC], [Springfield, Va .
Written in English


Edition Notes

StatementGeorge C. Soulas.
SeriesNASA contractor report -- 195335., NASA contractor report -- NASA CR-195335.
ContributionsUnited States. National Aeronautics and Space Administration.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL17000302M
OCLC/WorldCa32037539

Google's free service instantly translates words, phrases, and web pages between English and over other languages. Meet the Instructors. Shahram Amini. Shahram Amini earned a Ph.D. in Materials Science and Engineering from Drexel University and in Metallurgy and Materials Science, spent two years at the National Hypersonic Science Center at UC-Santa Barbara as a postdoctoral scholar, four years as a principal investigator at United Technologies Research Center, and five years at the Center.

  Proceedings of a meeting held July , Cleveland, Ohio, USA. Held at the AIAA Propulsion and.   A ring-shaped anode surrounds the cathode (colored red). If you switched on a simple magnetron like this, electrons would boil off from the cathode and zip across to the anode in straight lines (shown by the black arrow) much like the electron beam in a TV set. But there are two added extra bits in a magnetron that change things completely.

Throughout most of the twentieth century, electric propulsion was considered the technology of the future. Now, the future has arrived. This important new book explains the fundamentals of electric propulsion for spacecraft and describes in detail the physics and characteristics of the two major electric thrusters in use today, ion and Hall thrusters. The authors provide an introduction to. Figures 4 and 5 show the inverted, or hollow cathode cylindrical magnetron configuration with electrostatic end confinement [3,4]. The end caps are the anode. This configuration, with substrates placed inside the cathode, has the advantage that flux at all points within the cathode is about the same as the erosion flux at the target and is.


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Multiple hollow cathode wear testing Download PDF EPUB FB2

Get this from a library. Multiple hollow cathode wear testing. [George C Soulas; United States. National Aeronautics and Space Administration.]. Get this from a library. Multiple hollow cathode wear testing for the Space Station plasma contractor. [George C Soulas; United States.

National Aeronautics and Space Administration.]. Progress towards high-current, long-lifetime hollow cathodes has been made by Goebel and Chu 5,6 in testing a lanathanum hexaboride (LaB 6) bulk-emitting hollow cathode at up to A of.

Wear Testing and Analysis of Ion Engine Discharge Cathode Keeper Article (PDF Available) in Journal of Propulsion and Power 21(1) January with 68 Reads How we measure 'reads'. Fundamentals of Electric Propulsion: Ion and Hall Thrusters March The research described in this publication was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.

Reference herein to any specific commercial product, process, or service. The cathode for this thruster is a centrally mounted hollow cathode, which accounts for 7% of the total gas flow of the thruster under all modes of operation. Testing during and ranging from 5 to kW, to V, and 16 to A, demonstrated a specific impulse range of to s, with a maximum thrust of N.

Figure is a schematic of a vacuum evaporation system illustrating e-beam heating. It may be noticed that the deposit thickness is greatest directly above the center-line of the source and decreases away from it.This problem is overcome by imparting a complex motion to substrates (e.g.

in a planetary or rotating substrate holder) so as to even out the vapor flux on all parts of the Cited by: 9. 9/10/96 Multiple hollow cathode wear testing book Safety Information The Analytical Methods section describes methodologies using a wide variety of potentially hazardous chemicals (acids, bases, organicFile Size: 1MB.

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Purchase Handbook of Vacuum Arc Science & Technology - 1st Edition. Print Book & E-Book. ISBNBook Edition: 1. Lanthanum Hexaboride Hollow Cathode Performance and Wear Testing for the Asteroid Redirect Mission Hall Thruster View Section, Wear Test Demonstration of a Technique to Mitigate Keeper Erosion in a High-Current LaB 6 Hollow Cathode.

The hollow cathode arc source provides a robust plasma column with a density in the 10 13 – 10 14 cm − 3 range while external heating of the cathode allows the plasma arc regime to be accessed with applied voltages down to 20 V. Overall source operating principals are described, along with time-resolved plasma current measurements and.

Preparation for Hollow Cathode Testing for the Advanced Electric Propulsion System at NASA Glenn Research Center Determination of the work function distribution of a LaB6 hollow cathode based on plasma potential measurement and 2D plasma numerical simulation. Long Duration Wear Test of the NASA HERMeS Hall Thruster.

Jason D. Frieman. In order to combine PLD with RF and hollow cathode discharge, one electrode was fabricated in the shape of a cylinder, and RF power, when applied to the hollow cylindrical electrode, produced a stream of excited nitrogen gas (, ) (Jelínek et al.,Novotný et al., ).

Download: Download full-size image; Scheme of hybrid Author: M. Jelinek. Presented are nano-composite coatings to improve wear and corrosion resistance of high-strength steel parts or other substrate including the non-line-of-sight (NLOS) regions thereof.

The disclosed nano-composite coatings are shown to have a 3x to 5x improvement in wear rate compared to hard chrome. The invention includes the use of the directed vapor deposition (DVD) technique to deposit nano Author: Susie Eustis.

Hollow cathode lamps. Hollow cathode lamps (HCL) are the most common radiation source in LS AAS. [citation needed] Inside the sealed lamp, filled with argon or neon gas at low pressure, is a cylindrical metal cathode containing the element of interest and an anode.A high voltage is applied across the anode and cathode, resulting in an ionization of the fill gas.

The analysis of wastewater for trace and heavy metal contamination is an important step in ensuring human and environmental health. Wastewater is regulated differently in different countries, but the goal is to minimize the pollution introduced into natural waterways.

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An ion thruster or ion drive is a form of electric propulsion used for spacecraft creates thrust by accelerating ions using electricity. An ion thruster ionizes a neutral gas by extracting some electrons out of atoms, creating a cloud of positive ion thrusters rely mainly on electrostatics as ions are accelerated by the Coulomb force along an electric field.

Book Search tips Selecting this option will search all publications across the Scitation platform Selecting this Broadband microwave characteristics of a novel coaxial gridded hollow cathode argon plasma.

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