Impurity confinement and transport in high confinement regimes without edge localized modes on DIII-D [Impurity confinement and transport in high confinement regimes without ELMs on DIII-D]

Grierson, Brian A.; Burrell, Keith H.; Nazikian, Raffi M.; Solomon, Wayne M.; Garofalo, Andrea M.; Belli, Emily A.; Staebler, Gary M.; Fenstermacher, Max E.; McKee, George R.; Evans, Todd E.; Orlov, D. M.; Smith, S. P.; Chrobak, C.; Chrystal, C.

doi:10.1063/1.4918359

Title: Impurity confinement and transport in high confinement regimes without edge localized modes on DIII-D [Impurity confinement and transport in high confinement regimes without ELMs on DIII-D]

Journal Article · Fri Apr 17 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4918359· OSTI ID:1350063

Grierson, Brian A. ^[1];

^[2]; Nazikian, Raffi M. ^[1]; Solomon, Wayne M. ^[1]; Garofalo, Andrea M. ^[2];

^[2];

^[2]; Fenstermacher, Max E. ^[3]; McKee, George R. ^[4];

^[2]; Orlov, D. M. ^[5]; Smith, S. P. ^[2]; Chrobak, C. ^[2]; Chrystal, C. ^[5]

Princeton Univ., Princeton, NJ (United States). Princeton Plasma Physics Lab.
General Atomics, San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Wisconsin, Madison, WI (United States)
Univ. of California San Diego, La Jolla, CA (United States)

Here, impurity transport in the DIII-D tokamak is investigated in stationary high confinement (H-mode) regimes without edge localized modes (ELMs). In plasmas maintained by resonant magnetic perturbation (RMP) ELM-suppression and QH-mode the confinement time of fluorine (Z=9) is equivalent to that in ELMing discharges with 40 Hz ELMs. For selected discharges with impurity injection the impurity particle confinement time compared to the energy confinement time is in the range of τ_p/τ_e ≈ 2 $$-$$ 3. In QH-mode operation the impurity confinement time is shown to be smaller for intense, coherent magnetic and density fluctuations of the edge harmonic oscillation than weaker fluctuations. Transport coefficients are derived from the time evolution of the impurity density profile and compared to neoclassical and turbulent transport models NEO and TGLF. Neoclassical transport of fluorine is found to be small compared to the experimental values. In the ELMing and RMP ELM-suppressed plasma the impurity transport is affected by the presence of tearing modes. For radii larger than the mode radius the TGLF diffusion coefficient is smaller than the experimental value by a factor of 2-3, while the convective velocity is within error estimates. Low levels of diffusion are observed for radii smaller than the tearing mode radius. In the QH-mode plasma investigated, the TGLF diffusion coefficient higher inside of ρ = 0.4 and lower outside of 0.4 than the experiment, and the TGLF convective velocity is more negative by a factor of approximately 1.7.

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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); USDOE National Nuclear Security Administration (NNSA)

Contributing Organization:: DIII-D Team

Grant/Contract Number:: FC02-04ER54698; AC02-09CH11466; AC52-07NA27344; FG02-89ER53296; FG02-08ER54999

OSTI ID:: 1350063

Alternate ID(s):: OSTI ID: 1228317; OSTI ID: 1870963

Report Number(s):: LLNL-JRNL-834525; PHPAEN

Journal Information:: Physics of Plasmas, Vol. 22, Issue 5; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 45 works

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Title: Impurity confinement and transport in high confinement regimes without edge localized modes on DIII-D [Impurity confinement and transport in high confinement regimes without ELMs on DIII-D]

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