Development of an integrated core–edge scenario using the super H-mode

Wilks, Theresa M.; Knolker, Matthias; Snyder, Phil B.; Eldon, David; Scotti, Filippo; Chrystal, Colin; Laggner, Florian M.; Lasnier, C.; Mclean, A.; Osborne, Thomas; Paz-Soldan, Carlos; Wang, H.; Watkins, J.; Casali, L.; Grierson, B.; Hughes, Jerry W.

doi:10.1088/1741-4326/ac34d6

Title: Development of an integrated core–edge scenario using the super H-mode

Journal Article · Mon Nov 22 00:00:00 EST 2021 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac34d6· OSTI ID:1844846

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Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Sciences and Fusion Center
General Atomics, San Diego, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Columbia Univ., New York, NY (United States)
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)

An optimized pedestal regime called the super-H (SH) mode is leveraged to couple a fusion relevant core plasma with a high density scrape-off layer appropriate for realistic reactor power exhaust solutions. Recent DIII-D experiments have expanded the operating space of the SH regime using advanced control algorithms and investigated optimization of impurity seeding, deuterium gas puffing, and 3D magnetic perturbations. Simultaneous real-time control of the pedestal density and radiated power with in-vessel coils and nitrogen seeding enable optimal coupled divertor and pedestal conditions. Four case studies are analysed with varied levels of radiated power in the divertor volume ranging from 0 (no seeding) to 8.5 MW radiated from carbon and nitrogen emission. Plasmas with a 4.5 MW radiated power target establish a radiative mantle, leading to divertor temperatures of ~16 eV while maintaining SH-mode, and with only marginal impact on the pedestal and core performance. Increased levels of N₂ seeding with a 7.5 MW radiated power target facilitate detachment onset and divertor temperatures <5 eV, with no degradation in stored energy and the operational point remaining inside the SH-mode channel for >2.5 τ_E. Finally, a 8.5 MW radiated power target leads to partial detachment, which is so far associated with the loss of access to SH-mode pedestal conditions.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); General Atomics, San Diego, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC05-00OR22725; FC02-04ER54698; SC0014264; FG02-95ER54309; AC52-07NA27344; AC02-09CH11466; AC02-05CH11231; NA0003525

OSTI ID:: 1844846

Alternate ID(s):: OSTI ID: 1873630

Report Number(s):: LLNL-JRNL-836400; TRN: US2302400

Journal Information:: Nuclear Fusion, Vol. 61, Issue 12; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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