Operational domain of Proto-MPEX

Rapp, Juergen; Beers, Clyde J.; Biewer, Theodore M.; Bigelow, Tim S.; Caneses Marin, Juan F.; Caughman, John B.; Diem, Stephanie; Goulding, Richard Howell; Isler, Ralph; Kafle, Nischal; Owen, Larry W.; Showers, Melissa A.

doi:10.1016/j.fusengdes.2018.03.064

Operational domain of Proto-MPEX

Conference · Fri Nov 30 23:00:00 EST 2018 · Fusion Engineering and Design

DOI:https://doi.org/10.1016/j.fusengdes.2018.03.064· OSTI ID:1486967

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ORNL

The Prototype-Material Plasma Exposure eXperiment (Proto-MPEX) is a linear plasma device to test the plasma source concepts for the future Material Plasma Exposure eXperiment (MPEX). MPEX is planned to address plasma material interactions under fusion reactor divertor conditions as will occur in devices like DEMO, including the plasma exposure of a-priori neutron irradiated materials. This requires a novel linear plasma device with a plasma source that can produce high electron densities along with heating systems to obtain high electron and ion temperatures. In Proto-MPEX a high-power helicon source was tested together with electron heating (28 GHz microwaves) and ion cyclotron heating (8.5-12 MHz). Electron densities in excess of 1 × 1020 m-3 were produced with the helicon antenna. Electron temperatures can reach 20 eV and are typically below 6 eV at high densities (>5 × 1019 m-3). Ion heating has been demonstrated at low electron densities (<2 × 1019 m-3) with ion temperatures of up to 13 eV. Maximum heat fluxes of 14 MW/m2 have been obtained in low density discharges (~5 × 1018 m-3), while heat fluxes are typically only 2–3 MW/m2 in high density discharges (>2 × 1019 m-3).

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1486967

Journal Information:: Fusion Engineering and Design, Journal Name: Fusion Engineering and Design Vol. 136; ISSN 0920-3796

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

References (15)

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Heat flux estimates of power balance on Proto-MPEX with IR imaging Showers, M.; Biewer, T. M.; Caughman, J. B. O. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4959953	journal	August 2016
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First results from the Thomson scattering diagnostic on proto-MPEX Biewer, T. M.; Meitner, S.; Rapp, J. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4959163	journal	August 2016
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Plasma source development for fusion-relevant material testing Caughman, John B. O.; Goulding, Richard H.; Biewer, Theodore M. Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, Vol. 35, Issue 3 https://doi.org/10.1116/1.4982664	journal	May 2017

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