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

Beers, Clyde J.; Lindquist, Elizabeth G.; Biewer, Theodore M.; Caneses, Juan F.; Caughman, John B. O.; Goulding, Richard Howell; Kafle, Nischal; Ray, Holly B.; Showers, Melissa A.; Zinkle, Steven J.; Rapp, Juergen

doi:10.1016/j.fusengdes.2018.11.056

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

Journal Article · Sat Dec 08 00:00:00 EST 2018 · Fusion Engineering and Design

DOI:https://doi.org/10.1016/j.fusengdes.2018.11.056· OSTI ID:1486956

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Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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. As a result, 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.

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

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1486956

Journal Information:: Fusion Engineering and Design, Vol. 138, Issue C; ISSN 0920-3796

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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References (24)

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Utilization of O-X-B mode conversion of 28 GHz microwaves to heat core electrons in the upgraded Proto-MPEX Biewer, T. M.; Lau, C.; Bigelow, T. S. Physics of Plasmas, Vol. 26, Issue 5 https://doi.org/10.1063/1.5093321	journal	May 2019

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