Progress in the development of a high power helicon plasma source for the materials plasma exposure eXperiment

R. H. Goulding; J. B.O. Caughman; J. Rapp; T. M. Biewer; T. S. Bigelow; I. H. Campbell; J. F. Caneses; D. Donovan; N. Kafle; E. H. Martin; H. B. Ray; G. C. Shaw; M. A. Showers

doi:10.1080/15361055.2017.1352429

Progress in the development of a high power helicon plasma source for the materials plasma exposure eXperiment

R. H. Goulding, J. B.O. Caughman, J. Rapp, T. M. Biewer, T. S. Bigelow, I. H. Campbell, J. F. Caneses, D. Donovan, N. Kafle, E. H. Martin, H. B. Ray, G. C. Shaw, M. A. Showers

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36 Scopus citations

Abstract

Proto-MPEX is a linear plasma device being used to study a novel RF source concept for the planned Material Plasma Exposure eXperiment (MPEX), which will address plasma-materials interaction (PMI) for nuclear fusion reactors. Plasmas are produced using a large diameter helicon source operating at a frequency of 13.56 MHz at power levels up to 120 kW. In recent experiments the helicon source has produced deuterium plasmas with densities up to ∼6 × 10¹⁹ m^-3 measured at a location 2 m downstream from the antenna and 0.4 m from the target. Previous plasma production experiments on Proto-MPEX have generated lower density plasmas with hollow electron temperature profiles and target power deposition peaked far off axis. The latest experiments have produced flat T_e profiles with a large portion of the power deposited on the target near the axis. This and other evidence points to the excitation of a helicon mode in this case.

Original language	English
Pages (from-to)	588-594
Number of pages	7
Journal	Fusion Science and Technology
Volume	72
Issue number	4
DOIs	https://doi.org/10.1080/15361055.2017.1352429
State	Published - Nov 2017

Funding

This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, under contract number DEAC05-00OR22725.

Keywords

Deuterium
Helicon plasma
MPEX

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10.1080/15361055.2017.1352429

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Goulding, R. H., Caughman, J. B. O., Rapp, J., Biewer, T. M., Bigelow, T. S., Campbell, I. H., Caneses, J. F., Donovan, D., Kafle, N., Martin, E. H., Ray, H. B., Shaw, G. C., & Showers, M. A. (2017). Progress in the development of a high power helicon plasma source for the materials plasma exposure eXperiment. Fusion Science and Technology, 72(4), 588-594. https://doi.org/10.1080/15361055.2017.1352429

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title = "Progress in the development of a high power helicon plasma source for the materials plasma exposure eXperiment",

abstract = "Proto-MPEX is a linear plasma device being used to study a novel RF source concept for the planned Material Plasma Exposure eXperiment (MPEX), which will address plasma-materials interaction (PMI) for nuclear fusion reactors. Plasmas are produced using a large diameter helicon source operating at a frequency of 13.56 MHz at power levels up to 120 kW. In recent experiments the helicon source has produced deuterium plasmas with densities up to ∼6 × 1019 m-3 measured at a location 2 m downstream from the antenna and 0.4 m from the target. Previous plasma production experiments on Proto-MPEX have generated lower density plasmas with hollow electron temperature profiles and target power deposition peaked far off axis. The latest experiments have produced flat Te profiles with a large portion of the power deposited on the target near the axis. This and other evidence points to the excitation of a helicon mode in this case.",

keywords = "Deuterium, Helicon plasma, MPEX",

author = "Goulding, {R. H.} and Caughman, {J. B.O.} and J. Rapp and Biewer, {T. M.} and Bigelow, {T. S.} and Campbell, {I. H.} and Caneses, {J. F.} and D. Donovan and N. Kafle and Martin, {E. H.} and Ray, {H. B.} and Shaw, {G. C.} and Showers, {M. A.}",

note = "Publisher Copyright: {\textcopyright} American Nuclear Society.",

year = "2017",

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doi = "10.1080/15361055.2017.1352429",

language = "English",

volume = "72",

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Goulding, RH, Caughman, JBO, Rapp, J, Biewer, TM , Bigelow, TS, Campbell, IH, Caneses, JF, Donovan, D, Kafle, N, Martin, EH, Ray, HB, Shaw, GC & Showers, MA 2017, 'Progress in the development of a high power helicon plasma source for the materials plasma exposure eXperiment', Fusion Science and Technology, vol. 72, no. 4, pp. 588-594. https://doi.org/10.1080/15361055.2017.1352429

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AU - Caughman, J. B.O.

AU - Rapp, J.

AU - Biewer, T. M.

AU - Bigelow, T. S.

AU - Campbell, I. H.

AU - Caneses, J. F.

AU - Donovan, D.

AU - Kafle, N.

AU - Martin, E. H.

AU - Ray, H. B.

AU - Shaw, G. C.

AU - Showers, M. A.

PY - 2017/11

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AB - Proto-MPEX is a linear plasma device being used to study a novel RF source concept for the planned Material Plasma Exposure eXperiment (MPEX), which will address plasma-materials interaction (PMI) for nuclear fusion reactors. Plasmas are produced using a large diameter helicon source operating at a frequency of 13.56 MHz at power levels up to 120 kW. In recent experiments the helicon source has produced deuterium plasmas with densities up to ∼6 × 1019 m-3 measured at a location 2 m downstream from the antenna and 0.4 m from the target. Previous plasma production experiments on Proto-MPEX have generated lower density plasmas with hollow electron temperature profiles and target power deposition peaked far off axis. The latest experiments have produced flat Te profiles with a large portion of the power deposited on the target near the axis. This and other evidence points to the excitation of a helicon mode in this case.

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Progress in the development of a high power helicon plasma source for the materials plasma exposure eXperiment

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