- By:
- Beers, Clyde J; Lindquist, Elizabeth G; Biewer, Theodore M; Caneses Marin, Juan F; Caughman, John B; Goulding, Richard H; Kafle, Nischal ; Flynn, Holly B; Showers, Melissa A; Zinkle, Steven J; Rapp, Juergen
- Journal Name:
- Fusion Engineering and Design
- Page Number:
- 282-288
- Volume:
- 138
- Issue Number:
- n/a
- Publication Date:
- November 9, 2023
- View DOI Listing:
- https://doi.org/10.1016/j.fusengdes.2018.11.056
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.
