Multi-scale transport in the DIII-D ITER baseline scenario with direct electron heating and projection to ITER

Grierson, B. A.; Staebler, G. M.; Solomon, W. M.; McKee, G. R.; Holland, C.; Austin, M.; Marinoni, A.; Schmitz, L.; Pinsker, R. I.

doi:10.1063/1.5011387

Title: Multi-scale transport in the DIII-D ITER baseline scenario with direct electron heating and projection to ITER

Journal Article · Tue Feb 13 00:00:00 EST 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5011387· OSTI ID:1432047

Grierson, B. A. ^[1]; Staebler, G. M. ^[2];

^[2]; McKee, G. R. ^[3]; Holland, C. ^[4]; Austin, M. ^[4]; Marinoni, A. ^[5]; Schmitz, L. ^[6]; Pinsker, R. I. ^[2]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
General Atomics, San Diego, CA (United States)
Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineering Physics
Univ. of Texas, Austin, TX (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Univ. of California, Los Angeles, CA (United States)

Multi-scale fluctuations measured by turbulence diagnostics spanning long and short wavelength spatial scales impact energy confinement and the scale-lengths of plasma kinetic profiles in the DIII-D ITER baseline scenario with direct electron heating. Contrasting discharge phases with ECH + neutral beam injection (NBI) and NBI only at similar rotation reveal higher energy confinement and lower fluctuations when only NBI heating is used. Modeling of the core transport with TGYRO using the TGLF turbulent transport model and NEO neoclassical transport reproduces the experimental profile changes upon application of direct electron heating and indicates that multi-scale transport mechanisms are responsible for changes in the temperature and density profiles. Intermediate and high-k fluctuations appear responsible for the enhanced electron thermal flux, and intermediate-k electron modes produce an inward particle pinch that increases the inverse density scale length. Projection to ITER is performed with TGLF and indicates a density profile that has a finite scale length due to intermediate-k electron modes at low collisionality and increases the fusion gain. For a range of E×B shear, the dominant mechanism that increases fusion performance is suppression of outward low-k particle flux and increased density peaking.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States)

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

Contributing Organization:: DIII-D Team

Grant/Contract Number:: FG02-08ER54999; FG03-97ER54415; AC02-09CH11466; FC02-04ER54698; FG02- 08ER54984; FG02-04ER54235; FG02-07ER54917

OSTI ID:: 1432047

Alternate ID(s):: OSTI ID: 1420351; OSTI ID: 1462499

Journal Information:: Physics of Plasmas, Vol. 25, Issue 2; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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Propagation of input parameter uncertainties in transport models Vaezi, P.; Holland, C.; Grierson, B. A. Physics of Plasmas, Vol. 25, Issue 10 https://doi.org/10.1063/1.5053906	journal	October 2018
Interpretative and predictive modelling of Joint European Torus collisionality scans Eriksson, F.; Fransson, E.; Oberparleiter, M. Plasma Physics and Controlled Fusion, Vol. 61, Issue 11 https://doi.org/10.1088/1361-6587/ab2f45	journal	September 2019
Progress and challenges in understanding core transport in tokamaks in support to ITER operations Mantica, P.; Angioni, C.; Bonanomi, N. Plasma Physics and Controlled Fusion, Vol. 62, Issue 1 https://doi.org/10.1088/1361-6587/ab5ae1	journal	December 2019
The effect of plasma shape and neutral beam mix on the rotation threshold for RMP-ELM suppression Paz-Soldan, C.; Nazikian, R.; Cui, L. Nuclear Fusion, Vol. 59, Issue 5 https://doi.org/10.1088/1741-4326/ab04c0	journal	March 2019
Predicting the rotation profile in ITER Chrystal, C.; Grierson, B. A.; Haskey, S. R. Nuclear Fusion, Vol. 60, Issue 3 https://doi.org/10.1088/1741-4326/ab6434	journal	January 2020
Interpretative and predictive modelling of Joint European Torus collisionality scans Eriksson, F.; Fransson, E.; Oberparleiter, M. IOP Publishing https://doi.org/10.5445/ir/1000118458	text	January 2019

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