Experimental studies of the arc chamber short circuit failure mechanism on the DIII-D neutral beam system

B.J. Crowley; J.P. Beckers; M. Velasco Enriquez; R. Jaspers; J.M. Rauch; J.T. Scoville; A. Sobota; Tijs A. Wijkamp

doi:10.1016/j.fusengdes.2019.02.138

Experimental studies of the arc chamber short circuit failure mechanism on the DIII-D neutral beam system

B.J. Crowley (Corresponding author), J.P. Beckers, M. Velasco Enriquez, R. Jaspers, J.M. Rauch, J.T. Scoville, A. Sobota, Tijs A. Wijkamp

Onderzoeksoutput: Bijdrage aan tijdschrift › Tijdschriftartikel › Academic › peer review

Samenvatting

Here we report on efforts to improve performance and longevity of the Neutral Beam Injection (NBI) system by initiating a R&D program aimed at studying the most common failure mechanism for the ion sources. To this end a filament driven plasma chamber has been constructed with plasma parameters similar to the arc chamber of NBI ion sources. A preliminary report of an investigation into the most common failure is presented here: The failure mechanism observed during helium operations on DIII-D is the result of electrical breakdown of the insulation material that separates the filament plates from the anode. The fault is reproduced in a table top experiment analogous to the DIII-D NBI ion source in key parameters and proposals for amelioration of the issue are discussed.

Originele taal-2	Engels
Pagina's (van-tot)	1605-1609
Aantal pagina's	5
Tijdschrift	Fusion Engineering and Design
Volume	146
Vroegere onlinedatum	5 apr 2019
DOI's	https://doi.org/10.1016/j.fusengdes.2019.02.138
Status	Gepubliceerd - sep 2019

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10.1016/j.fusengdes.2019.02.138

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title = "Experimental studies of the arc chamber short circuit failure mechanism on the DIII-D neutral beam system",

abstract = "Here we report on efforts to improve performance and longevity of the Neutral Beam Injection (NBI) system by initiating a R&D program aimed at studying the most common failure mechanism for the ion sources. To this end a filament driven plasma chamber has been constructed with plasma parameters similar to the arc chamber of NBI ion sources. A preliminary report of an investigation into the most common failure is presented here: The failure mechanism observed during helium operations on DIII-D is the result of electrical breakdown of the insulation material that separates the filament plates from the anode. The fault is reproduced in a table top experiment analogous to the DIII-D NBI ion source in key parameters and proposals for amelioration of the issue are discussed.",

keywords = "Fusion, Ion source, Neutral beams",

author = "B.J. Crowley and J.P. Beckers and {Velasco Enriquez}, M. and R. Jaspers and J.M. Rauch and J.T. Scoville and A. Sobota and Wijkamp, {Tijs A.}",

year = "2019",

month = sep,

doi = "10.1016/j.fusengdes.2019.02.138",

language = "English",

volume = "146",

pages = "1605--1609",

journal = "Fusion Engineering and Design",

issn = "0920-3796",

publisher = "Elsevier",

}

Experimental studies of the arc chamber short circuit failure mechanism on the DIII-D neutral beam system. / Crowley, B.J. (Corresponding author); Beckers, J.P.; Velasco Enriquez, M.; Jaspers, R.; Rauch, J.M.; Scoville, J.T.; Sobota, A.; Wijkamp, Tijs A.

In: Fusion Engineering and Design, Vol. 146, 09.2019, blz. 1605-1609.

Onderzoeksoutput: Bijdrage aan tijdschrift › Tijdschriftartikel › Academic › peer review

TY - JOUR

T1 - Experimental studies of the arc chamber short circuit failure mechanism on the DIII-D neutral beam system

AU - Crowley, B.J.

AU - Beckers, J.P.

AU - Velasco Enriquez, M.

AU - Jaspers, R.

AU - Rauch, J.M.

AU - Scoville, J.T.

AU - Sobota, A.

AU - Wijkamp, Tijs A.

PY - 2019/9

Y1 - 2019/9

N2 - Here we report on efforts to improve performance and longevity of the Neutral Beam Injection (NBI) system by initiating a R&D program aimed at studying the most common failure mechanism for the ion sources. To this end a filament driven plasma chamber has been constructed with plasma parameters similar to the arc chamber of NBI ion sources. A preliminary report of an investigation into the most common failure is presented here: The failure mechanism observed during helium operations on DIII-D is the result of electrical breakdown of the insulation material that separates the filament plates from the anode. The fault is reproduced in a table top experiment analogous to the DIII-D NBI ion source in key parameters and proposals for amelioration of the issue are discussed.

AB - Here we report on efforts to improve performance and longevity of the Neutral Beam Injection (NBI) system by initiating a R&D program aimed at studying the most common failure mechanism for the ion sources. To this end a filament driven plasma chamber has been constructed with plasma parameters similar to the arc chamber of NBI ion sources. A preliminary report of an investigation into the most common failure is presented here: The failure mechanism observed during helium operations on DIII-D is the result of electrical breakdown of the insulation material that separates the filament plates from the anode. The fault is reproduced in a table top experiment analogous to the DIII-D NBI ion source in key parameters and proposals for amelioration of the issue are discussed.

KW - Fusion

KW - Ion source

KW - Neutral beams

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DO - 10.1016/j.fusengdes.2019.02.138

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