The role of isotope mass on neutral fueling and density pedestal structure in the DIII-D tokamak

Chaban, Ryan A.; Mordijck, Saskia; Rosenthal, Aaron Michael; Bortolon, Alessandro; Hughes, Jerry W.; Knölker, M.; Laggner, Florian M.; Osborne, Tom H.; Schmitz, Lothar; Thome, Kathreen E.; Wilks, Theresa M.

doi:10.1088/1741-4326/ad2113

Title: The role of isotope mass on neutral fueling and density pedestal structure in the DIII-D tokamak

Journal Article · 21 January 2024 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ad2113 · OSTI ID:2283077

^[1]; Mordijck, Saskia ^[2];

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^[5]; Laggner, Florian M. ^[6]; Osborne, Tom H. ^[5];

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College of William and Mary, Williamsburg, VA (United States); General Atomics
College of William and Mary, Williamsburg, VA (United States)
Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States). Princeton University
General Atomics, San Diego, CA (United States)
North Carolina State University at Raleigh, NC (United States)
University of California, Los Angeles, CA (United States)

Experimental measurements on DIII-D of hydrogen neutral penetration lengths (λn0) on the high field side are longer by a factor of √2 than for deuterium consistent with the thermal velocity ratio for neutrals at the same temperature (v_th^H / v_th^H = √2). This ratio is constant for both low and high pedestal electron density. At low pedestal density (n_e ~4 × 10¹⁹m^-3), the neutral penetration length is greater than the density pedestal width for both isotopes, and the additional 41% increase of neutral penetration in hydrogen widens the pedestal by the same amount. As the density pedestal height increases (n_e ~6 × 10¹⁹m^-3), the neutral penetration lengths drop below the density pedestal widths for both isotopes, and the increased penetration of hydrogen has no increased effect on the pedestal width compared to deuterium. Here, extrapolating to future reactor-relevant high electron density pedestals, the isotope-mass increase on neutral fueling on the high field side in hydrogen will be negligible (0.2-0.4cm) in comparison to estimates of the width of the density pedestal (6-8.5 cm). Extrapolating to other isotopes compared to deuterium, while hydrogen is an increase of 41% \ (√2 \sim 1.41), moving from deuterium to tritium the neutral penetration will decrease 19% (√(2/3) \sim 0.81) implying the isotope mass effect on neutral fueling in the pedestal will be negligible in a D-T reactor.

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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; SC0019302; AC02-09CH11466

OSTI ID:: 2283077

Alternate ID(s):: OSTI ID: 2311032; OSTI ID: 2326059; OSTI ID: 2339834; OSTI ID: 2282246

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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