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An Experimental Investigation of Hea...

Ham, Ryan K.,

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An Experimental Investigation of Heaterless Hollow Cathode Ignition /

Record Type:	Electronic resources : Monograph/item
Title/Author:	An Experimental Investigation of Heaterless Hollow Cathode Ignition // Ryan K Ham.
Author:	Ham, Ryan K.,
Description:	1 electronic resource (89 pages)
Notes:	Source: Masters Abstracts International, Volume: 82-01.
Contained By:	Masters Abstracts International82-01.
Subject:	Mechanical engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27837018
ISBN:	9798641826592

An Experimental Investigation of Heaterless Hollow Cathode Ignition /
Ham, Ryan K.,

An Experimental Investigation of Heaterless Hollow Cathode Ignition /Ryan K Ham. - 1 electronic resource (89 pages)

Source: Masters Abstracts International, Volume: 82-01.

A hollow cathode is a specially designed plasma source that is capable of driving a large electron emission current throughout the course of a remarkably long lifetime. Given these characteristics, hollow cathodes are commonly used as electron sources in state-of-the-art plasma thrusters. Modern advancements in small-satellite technology have led to an increased demand for low-power electric propulsion systems. Given the high thrust-to-power ratio and flight-proven heritage of Hall-effect thrusters, efforts are currently being made to downsize these thrusters to a considerably small scale. By forgoing the use of a heater, heaterless hollow cathodes provide several advantages that are best realized in miniaturized Hall-effect thrusters. Unfortunately, the lack of a cathode heater gives rise to nontrivial complications in the process of igniting a plasma discharge, along with reason to believe that life-limiting cathode erosion could occur during ignition. These concerns have resulted in a lack of confidence that heaterless hollow cathode technology can endure the rigors of spaceflight qualification. In this research, heaterless hollow cathode ignition behavior was characterized. In doing so, it was found that repeatable and reliable instant start ignition behavior can be achieved when using a high propellant mass flow rate. To provide this flow condition without placing a large burden on a propellant feed system, a novel gas flow mechanism was developed and characterized. To investigate whether instant start ignition causes cathode erosion, a series of tests were performed in which heaterless hollow cathodes were subjected to a large number of ignition cycles. Microscopy revealed no indication of cathodic arc activity, and no other evidence of life-limiting erosion were observed. The instant start ignition process appears to be a viable approach to heaterless hollow cathode ignition, and we believe it provides a means for heaterless hollow cathode technology to be integrated into spaceflight propulsion systems.

English

ISBN: 9798641826592Subjects--Topical Terms:

649730
Mechanical engineering.
Subjects--Index Terms:

Electric Propulsion

An Experimental Investigation of Heaterless Hollow Cathode Ignition /
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100 1 $a Ham, Ryan K., $e author. $3 3823764
245 1 3 $a An Experimental Investigation of Heaterless Hollow Cathode Ignition / $c Ryan K Ham.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2020
300 $a 1 electronic resource (89 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
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500 $a Source: Masters Abstracts International, Volume: 82-01.
500 $a Advisors: Williams, John D. Committee members: Yalin, Azer P.; Marconi, Mario C.; Tomasel, Fernando G.
502 $b M.S. $c Colorado State University $d 2020.
520 $a A hollow cathode is a specially designed plasma source that is capable of driving a large electron emission current throughout the course of a remarkably long lifetime. Given these characteristics, hollow cathodes are commonly used as electron sources in state-of-the-art plasma thrusters. Modern advancements in small-satellite technology have led to an increased demand for low-power electric propulsion systems. Given the high thrust-to-power ratio and flight-proven heritage of Hall-effect thrusters, efforts are currently being made to downsize these thrusters to a considerably small scale. By forgoing the use of a heater, heaterless hollow cathodes provide several advantages that are best realized in miniaturized Hall-effect thrusters. Unfortunately, the lack of a cathode heater gives rise to nontrivial complications in the process of igniting a plasma discharge, along with reason to believe that life-limiting cathode erosion could occur during ignition. These concerns have resulted in a lack of confidence that heaterless hollow cathode technology can endure the rigors of spaceflight qualification. In this research, heaterless hollow cathode ignition behavior was characterized. In doing so, it was found that repeatable and reliable instant start ignition behavior can be achieved when using a high propellant mass flow rate. To provide this flow condition without placing a large burden on a propellant feed system, a novel gas flow mechanism was developed and characterized. To investigate whether instant start ignition causes cathode erosion, a series of tests were performed in which heaterless hollow cathodes were subjected to a large number of ignition cycles. Microscopy revealed no indication of cathodic arc activity, and no other evidence of life-limiting erosion were observed. The instant start ignition process appears to be a viable approach to heaterless hollow cathode ignition, and we believe it provides a means for heaterless hollow cathode technology to be integrated into spaceflight propulsion systems.
546 $a English
590 $a School code: 0053
650 4 $a Mechanical engineering. $3 649730
650 4 $a Plasma physics. $3 3175417
650 4 $a Electrical engineering. $3 649834
653 $a Electric Propulsion
653 $a Plasma Propulsion
653 $a Propulsion
653 $a Satellite Technology
653 $a Space Technology
653 $a Thruster
690 $a 0548
690 $a 0759
690 $a 0544
710 2 $a Colorado State University. $b Mechanical Engineering. $e degree granting institution. $3 3821970
720 1 $a Williams, John D. $e degree supervisor.
773 0 $t Masters Abstracts International $g 82-01.
790 $a 0053
791 $a M.S.
792 $a 2020
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27837018