Transport at high ${\beta_p}$ and development of candidate steady state scenarios for ITER

McClenaghan, J.; Garofalo, A. M.; Lao, L. L.; Weisberg, D. B.; Meneghini, O.; Smith, S. P.; Lyons, B. C.; Staebler, G. M.; Ding, S. Y.; Huang, J.; Gong, X.; Qian, J.; Ren, Q.; Holcomb, C. T.

doi:10.1088/1741-4326/ab74a0

Title: Transport at high $${\beta_p}$$ and development of candidate steady state scenarios for ITER

Journal Article · Wed Mar 11 00:00:00 EDT 2020 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ab74a0· OSTI ID:1734980

McClenaghan, J. ^[1];

^[1]; Lao, L. L. ^[1];

^[1]; Meneghini, O. ^[1]; Smith, S. P. ^[1];

^[1];

^[2];

^[3]; Gong, X. ^[3]; Qian, J. ^[3]; Ren, Q. ^[3]; Holcomb, C. T. ^[4]

General Atomics, San Diego, CA (United States)
Chinese Academy of Sciences (CAS), Hefei (China); Oak Ridge Associated Univ., Oak Ridge, TN (United States)
Chinese Academy of Sciences (CAS), Hefei (China)
Oak Ridge Associated Univ., Oak Ridge, TN (United States)

On DIII-D, the high β_p scenario has an internal transport barrier (ITB), β_N~β_p~3,q₉₅~10, and very high normalized confinement H_98,y2~1.6. Recently, plasmas starting with these conditions have been dynamically driven to q₉₅~6 and β_p~2, where we find the ITB and high performance persist for five energy confinement times. These conditions are projected to meet the ITER steady-state goal of Q = 5. The ITB is maintained at lower β_p with a strong reverse shear, consistent with predictions that negative central shear can lower the β_p threshold for the ITB. There are two observed confinement states in the high β_pscenario: H-mode confinement state with a high edge pedestal, and an enhanced confinement state with a low pedestal and an ITB. It has been observed in a scan of external resonant magnetic perturbation amplitude that when there are no large type-I ELMs, there is no transition to enhanced confinement. This is consistent with the proposed mechanism for ITB formation being a type-I ELM. Quasilinear gyro-Landau fluid predictive modeling of ITER suggests that only a modest reverse shear is required to achieve the ITB formation necessary for Q=5 when electromagnetic physics including the kinetic ballooning mode (KBM) is incorporated.

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Research Organization:: 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); Chinese Academy of Sciences

Grant/Contract Number:: FC02-04ER54698; AC52-07NA27344; FG02-95ER54309; SC0010685; SC0017992; 2015GB102002; 2015GB10

OSTI ID:: 1734980

Alternate ID(s):: OSTI ID: 1604324

Report Number(s):: LLNL-JRNL-812778; 1017706; TRN: US2205199

Journal Information:: Nuclear Fusion, Vol. 60, Issue 4; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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References (37)

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