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Hollow cathode life time model

Hollow cathode life time model
Hollow cathode life time model
In this paper the latest advances in the hollow cathode lifetime modeling carried out at the University of Southampton will be presented. A barium oxide insert depletion model and a surface low work function compounds deposition/depletion model have been already developed by the authors. Here a procedure to update the plasma parameters relatively to changes of the hollow cathode surface work function and an end-of-life criterion will be presented. The procedure has been validated with experimental results and then coupled with the deposition/desorption model already developed by the authors. The evolution of the surface of the cathode tested for 28,000 hours by Sarver-Verhey has been simulated and from the data obtained an end of life criterion has been developed. Then using this criterion the ELT NSTAR discharge cathode has been simulated under the throttling conditions used during the Deep Space 1 Spare Ion Engine. The lifetimes found are in agreement with the theoretical expectation.
hollow cathode, lifetime, barium depletion
1883-9630
1595-1601
Coletti, Michele
f99567c2-8fab-42dd-9e25-c3f69495667f
Gabriel, Stephen B.
ac76976d-74fd-40a0-808d-c9f68a38f259
Coletti, Michele
f99567c2-8fab-42dd-9e25-c3f69495667f
Gabriel, Stephen B.
ac76976d-74fd-40a0-808d-c9f68a38f259

Coletti, Michele and Gabriel, Stephen B. (2009) Hollow cathode life time model. Journal of Plasma and Fusion Research Series, 8, 1595-1601.

Record type: Article

Abstract

In this paper the latest advances in the hollow cathode lifetime modeling carried out at the University of Southampton will be presented. A barium oxide insert depletion model and a surface low work function compounds deposition/depletion model have been already developed by the authors. Here a procedure to update the plasma parameters relatively to changes of the hollow cathode surface work function and an end-of-life criterion will be presented. The procedure has been validated with experimental results and then coupled with the deposition/desorption model already developed by the authors. The evolution of the surface of the cathode tested for 28,000 hours by Sarver-Verhey has been simulated and from the data obtained an end of life criterion has been developed. Then using this criterion the ELT NSTAR discharge cathode has been simulated under the throttling conditions used during the Deep Space 1 Spare Ion Engine. The lifetimes found are in agreement with the theoretical expectation.

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More information

Published date: 30 September 2009
Additional Information: Proceedings of the 14th International Congress on Plasma Physics (ICPP2008), September 8-12, 2008, Fukuoka, Japan
Keywords: hollow cathode, lifetime, barium depletion
Organisations: Astronautics Group

Identifiers

Local EPrints ID: 156411
URI: http://eprints.soton.ac.uk/id/eprint/156411
ISSN: 1883-9630
PURE UUID: a289f3ac-f2cc-48f8-bc56-7a9c48a556fb

Catalogue record

Date deposited: 02 Jun 2010 10:49
Last modified: 10 Dec 2021 18:15

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Contributors

Author: Michele Coletti
Author: Stephen B. Gabriel

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