Characterization of the helicon plasma flux to the target of Proto-MPEX

C. J. Beers; E. G. Lindquist; T. M. Biewer; J. F. Caneses; J. B.O. Caughman; R. H. Goulding; N. Kafle; H. Ray; M. A. Showers; S. J. Zinkle; J. Rapp

doi:10.1016/j.fusengdes.2018.11.056

Characterization of the helicon plasma flux to the target of Proto-MPEX

C. J. Beers
, E. G. Lindquist
, T. M. Biewer
, J. F. Caneses
, J. B.O. Caughman
, R. H. Goulding
, N. Kafle
, H. Ray
, M. A. Showers
, S. J. Zinkle
, J. Rapp

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

8 Scopus citations

Abstract

The ITER divertor will have to handle the boundary plasma power exhaust in the form of high heat and particle flux. The Prototype Material Plasma Exposure eXperiment (Proto-MPEX) is a plasma source development device for the proposed Material Plasma Exposure eXperiment (MPEX), which is intended to create fusion reactor divertor-like plasma conditions for studying plasma material interactions. Here, ion fluxes to various targets within Proto-MPEX are found to be 5 ± 2.5 × 10²³ m⁻²s^-1 when using only a helicon plasma source. The fluxes along the flux tube are compared for both 30 cm in front of the target and a few cm in front of the target. The emission intensity fall-off distance in front of the target is studied via Balmer series from a visible camera looking at the target. This fall-off distance of ∼2–4 cm and the dissociation and ionization mean free path of D₂ being over 0.5 m leads to a conclusion that Proto-MPEX is not in a high recycling regime with helicon only plasmas.

Original language	English
Pages (from-to)	282-288
Number of pages	7
Journal	Fusion Engineering and Design
Volume	138
DOIs	https://doi.org/10.1016/j.fusengdes.2018.11.056
State	Published - Jan 2019

Funding

The authors would like to thank the Proto-MPEX team for their support and aid in diagnostics and machine operation. This work was supported by the Oak Ridge National Laboratory managed by the UT-Battelle, LLC, for the U.S. Department of Energy under AE-AC05-00OR22725 .

Keywords

Helicon antenna
Ion flux
Proto-MPEX

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10.1016/j.fusengdes.2018.11.056

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title = "Characterization of the helicon plasma flux to the target of Proto-MPEX",

abstract = "The ITER divertor will have to handle the boundary plasma power exhaust in the form of high heat and particle flux. The Prototype Material Plasma Exposure eXperiment (Proto-MPEX) is a plasma source development device for the proposed Material Plasma Exposure eXperiment (MPEX), which is intended to create fusion reactor divertor-like plasma conditions for studying plasma material interactions. Here, ion fluxes to various targets within Proto-MPEX are found to be 5 ± 2.5 × 1023 m−2s-1 when using only a helicon plasma source. The fluxes along the flux tube are compared for both 30 cm in front of the target and a few cm in front of the target. The emission intensity fall-off distance in front of the target is studied via Balmer series from a visible camera looking at the target. This fall-off distance of ∼2–4 cm and the dissociation and ionization mean free path of D2 being over 0.5 m leads to a conclusion that Proto-MPEX is not in a high recycling regime with helicon only plasmas.",

keywords = "Helicon antenna, Ion flux, Proto-MPEX",

author = "Beers, \{C. J.\} and Lindquist, \{E. G.\} and Biewer, \{T. M.\} and Caneses, \{J. F.\} and Caughman, \{J. B.O.\} and Goulding, \{R. H.\} and N. Kafle and H. Ray and Showers, \{M. A.\} and Zinkle, \{S. J.\} and J. Rapp",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2019",

month = jan,

doi = "10.1016/j.fusengdes.2018.11.056",

language = "English",

volume = "138",

pages = "282--288",

journal = "Fusion Engineering and Design",

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AU - Beers, C. J.

AU - Lindquist, E. G.

AU - Biewer, T. M.

AU - Caneses, J. F.

AU - Caughman, J. B.O.

AU - Goulding, R. H.

AU - Kafle, N.

AU - Ray, H.

AU - Showers, M. A.

AU - Zinkle, S. J.

AU - Rapp, J.

PY - 2019/1

Y1 - 2019/1

N2 - The ITER divertor will have to handle the boundary plasma power exhaust in the form of high heat and particle flux. The Prototype Material Plasma Exposure eXperiment (Proto-MPEX) is a plasma source development device for the proposed Material Plasma Exposure eXperiment (MPEX), which is intended to create fusion reactor divertor-like plasma conditions for studying plasma material interactions. Here, ion fluxes to various targets within Proto-MPEX are found to be 5 ± 2.5 × 1023 m−2s-1 when using only a helicon plasma source. The fluxes along the flux tube are compared for both 30 cm in front of the target and a few cm in front of the target. The emission intensity fall-off distance in front of the target is studied via Balmer series from a visible camera looking at the target. This fall-off distance of ∼2–4 cm and the dissociation and ionization mean free path of D2 being over 0.5 m leads to a conclusion that Proto-MPEX is not in a high recycling regime with helicon only plasmas.

AB - The ITER divertor will have to handle the boundary plasma power exhaust in the form of high heat and particle flux. The Prototype Material Plasma Exposure eXperiment (Proto-MPEX) is a plasma source development device for the proposed Material Plasma Exposure eXperiment (MPEX), which is intended to create fusion reactor divertor-like plasma conditions for studying plasma material interactions. Here, ion fluxes to various targets within Proto-MPEX are found to be 5 ± 2.5 × 1023 m−2s-1 when using only a helicon plasma source. The fluxes along the flux tube are compared for both 30 cm in front of the target and a few cm in front of the target. The emission intensity fall-off distance in front of the target is studied via Balmer series from a visible camera looking at the target. This fall-off distance of ∼2–4 cm and the dissociation and ionization mean free path of D2 being over 0.5 m leads to a conclusion that Proto-MPEX is not in a high recycling regime with helicon only plasmas.

KW - Helicon antenna

KW - Ion flux

KW - Proto-MPEX

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DO - 10.1016/j.fusengdes.2018.11.056

M3 - Article

AN - SCOPUS:85057732218

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SP - 282

EP - 288

JO - Fusion Engineering and Design

JF - Fusion Engineering and Design

ER -

Characterization of the helicon plasma flux to the target of Proto-MPEX

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Keywords

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