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

Research output: Contribution to journal › Article › Academic › peer-review

3 Citations (Scopus)

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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.

Original language	English
Pages (from-to)	1605-1609
Number of pages	5
Journal	Fusion Engineering and Design
Volume	146
Early online date	5 Apr 2019
DOIs	https://doi.org/10.1016/j.fusengdes.2019.02.138
Publication status	Published - Sept 2019

Funding

This material was based upon work supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences , using the DIII-D National Fusion Facility, a DOE Office of Science user facility, under Award No. DE-FC02-04ER54698. This work was also supported by EUROfusion through The European Fusion Education Network and by Research Experience for Peruvian Undergraduates (REPU) program.

Keywords

Fusion
Ion source
Neutral beams

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10.1016/j.fusengdes.2019.02.138

publishers versionFinal published version, 889 KBLicence: TAVERNE

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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.",

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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

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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.

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KW - Neutral beams

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VL - 146

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JO - Fusion Engineering and Design

JF - Fusion Engineering and Design

ER -

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

Abstract

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Keywords

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