Understanding and predicting profile structure and parametric scaling of intrinsic rotation

Wang, W. X.; Grierson, B. A.; Ethier, S.; Chen, J.; Startsev, E.; Diamond, P. H.

doi:10.1063/1.4997789

Title: Understanding and predicting profile structure and parametric scaling of intrinsic rotation

Journal Article · Thu Aug 10 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4997789· OSTI ID:1419789

Wang, W. X. ^[1]; Grierson, B. A. ^[1]; Ethier, S. ^[1]; Chen, J. ^[1]; Startsev, E. ^[1]; Diamond, P. H. ^[2]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of California, San Diego, La Jolla, CA (United States)

This study reports on a recent advance in developing physical understanding and a first-principles-based model for predicting intrinsic rotation profiles in magnetic fusion experiments. It is shown for the first time that turbulent fluctuation-driven residual stress (a non-diffusive component of momentum flux) along with diffusive momentum flux can account for both the shape and magnitude of the observed intrinsic toroidal rotation profile. Both the turbulence intensity gradient and zonal flow E×B shear are identified as major contributors to the generation of the k_∥-asymmetry needed for the residual stress generation. The model predictions of core rotation based on global gyrokinetic simulations agree well with the experimental measurements of main ion toroidal rotation for a set of DIII-D ECH discharges. The validated model is further used to investigate the characteristic dependence of residual stress and intrinsic rotation profile structure on the multi-dimensional parametric space covering the turbulence type, q-profile structure, and up-down asymmetry in magnetic geometry with the goal of developing the physics understanding needed for rotation profile control and optimization. It is shown that in the flat-q profile regime, intrinsic rotations driven by ITG and TEM turbulence are in the opposite direction (i.e., intrinsic rotation reverses). The predictive model also produces reversed intrinsic rotation for plasmas with weak and normal shear q-profiles.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466; FC02-04ER54698

OSTI ID:: 1419789

Alternate ID(s):: OSTI ID: 1374677

Journal Information:: Physics of Plasmas, Vol. 24, Issue 9; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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Intrinsic rotation in axisymmetric devices Stoltzfus-Dueck, T. Plasma Physics and Controlled Fusion, Vol. 61, Issue 12 https://doi.org/10.1088/1361-6587/ab4376	journal	November 2019
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Generation of parasitic axial flow by drift wave turbulence with broken symmetry: Theory and experiment Hong, R.; Li, J. C.; Thakur, R. Hajjar. Chakraborty arXiv https://doi.org/10.48550/arxiv.1805.03705	text	January 2018

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