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Investigation of heaterless hollow cathode breakdown

Investigation of heaterless hollow cathode breakdown
Investigation of heaterless hollow cathode breakdown
The development of long life high powered (>50A) hollow cathodes is of importance to meet the demand of increasingly powerful Gridded Ion engines and Hall Effect thrusters. High power cathodes typically operate at greater temperature ranges, which poses a significant challenge to maintain heater reliability. The heater component commonly used to raise the insert to emissive temperatures, has inherent reliability issues from thermal fatigue caused by thermal cycling with large temperature variations. A self-heating hollow cathode allows for potentially higher reliability through design simplicity of removing the heater component, and in addition there can be savings in mass, volume, ignition time and power. This study characterizes the initiation of the start-up process for a heaterless hollow cathode. As such the study analyses conditions of the initiation as a function of detailed geometrical and physical parameters. The Paschen curve can be seen to give a qualitative explanation for the breakdown voltage variance. The quantitative variations between the empirical results and Paschen curve are discussed in relation to non-uniform pressure simulations.
Daykin-Iliopoulos, A.
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Gabriel, S.B.
ac76976d-74fd-40a0-808d-c9f68a38f259
Golosnoy, I.O.
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Kubota, K.
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Funaki, I.
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Daykin-Iliopoulos, A.
0caedbac-93a0-45c9-ae31-02f6c70ab8c0
Gabriel, S.B.
ac76976d-74fd-40a0-808d-c9f68a38f259
Golosnoy, I.O.
40603f91-7488-49ea-830f-24dd930573d1
Kubota, K.
a3f45ee0-2569-4377-8196-f007c36d0e6d
Funaki, I.
55ea3b2b-8a4b-4a50-b596-34004d3a57a3

Daykin-Iliopoulos, A., Gabriel, S.B., Golosnoy, I.O., Kubota, K. and Funaki, I. (2015) Investigation of heaterless hollow cathode breakdown. 34th International Electric Propulsion Conference, Japan. 04 - 10 Jul 2015. 9 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

The development of long life high powered (>50A) hollow cathodes is of importance to meet the demand of increasingly powerful Gridded Ion engines and Hall Effect thrusters. High power cathodes typically operate at greater temperature ranges, which poses a significant challenge to maintain heater reliability. The heater component commonly used to raise the insert to emissive temperatures, has inherent reliability issues from thermal fatigue caused by thermal cycling with large temperature variations. A self-heating hollow cathode allows for potentially higher reliability through design simplicity of removing the heater component, and in addition there can be savings in mass, volume, ignition time and power. This study characterizes the initiation of the start-up process for a heaterless hollow cathode. As such the study analyses conditions of the initiation as a function of detailed geometrical and physical parameters. The Paschen curve can be seen to give a qualitative explanation for the breakdown voltage variance. The quantitative variations between the empirical results and Paschen curve are discussed in relation to non-uniform pressure simulations.

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IEPC2015_A Daykin-Iliopoulos_Manuscript_Final.pdf - Accepted Manuscript
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More information

Accepted/In Press date: June 2015
Published date: July 2015
Venue - Dates: 34th International Electric Propulsion Conference, Japan, 2015-07-04 - 2015-07-10
Organisations: EEE

Identifiers

Local EPrints ID: 380287
URI: http://eprints.soton.ac.uk/id/eprint/380287
PURE UUID: 9389716c-37c3-43fb-b37e-ace04d0068ef

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Date deposited: 08 Sep 2015 12:51
Last modified: 01 Oct 2019 16:31

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