SiC as a core-edge integrated wall solution in DIII-D

Zamperini, S.; Abrams, T.; Nichols, J.; Unterberg, E.; Lasa, A.; Stangeby, P.; Bringuier, S.; Rudakov, D.; Elder, J. D.

doi:10.1016/j.nme.2023.101535

Title: SiC as a core-edge integrated wall solution in DIII-D

Journal Article · 10 October 2023 · Nuclear Materials and Energy

DOI: https://doi.org/10.1016/j.nme.2023.101535 · OSTI ID:2203203

^[1];

^[2];

^[3]; Unterberg, E. ^[3];

^[4];

^[5]; Bringuier, S. ^[6]; Rudakov, D. ^[7];

^[5]

General Atomics, San Diego, CA (United States); General Atomics, DIII-D National Fusion Facility
General Atomics, San Diego, CA (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
University of Tennessee, Knoxville, TN (United States)
University of Toronto, ON (Canada)
Independent Researcher
University of California, San Diego, CA (United States)

Silicon carbide (SiC) is a promising material for use in a fusion reactor due to its low hydrogenic diffusivity, high temperature strength and resilience under neutron irradiation. To assess SiC as a main wall material in DIII-D, simulations with TRIM.SP and DIVIMP are performed on a well-diagnosed L-mode discharge. The effective charge, Z_eff, across the separatrix is used as a figure of merit in comparing SiC to the current graphite walls. It is found that SiC is expected to reduce Z_eff, potentially by as much as ~50%. It is discussed how SiC may be expected to "self-condition" and create wall conditions similar to siliconization, further lowering Z_eff due to efficient oxygen gettering. Furthermore, the potential benefits are reviewed and a path towards SiC walls in DIII-D is presented.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FC02-04ER54698; FG02-07ER54917; AC05-00OR22725

OSTI ID:: 2203203

Report Number(s):: DOE-GA--54698

Journal Information:: Nuclear Materials and Energy, Journal Name: Nuclear Materials and Energy Vol. 37; ISSN 2352-1791

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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