Shafranov shift bifurcation of turbulent transport in the high βp scenario on DIII-D

McClenaghan, J.; Garofalo, A. M.; Staebler, G. M.; Ding, S. Y.; Gong, X.; Qian, J.; Huang, J.

doi:10.1088/1741-4326/ab4086

Title: Shafranov shift bifurcation of turbulent transport in the high β_p scenario on DIII-D

Journal Article · Mon Sep 02 00:00:00 EDT 2019 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ab4086· OSTI ID:1569029

McClenaghan, J. ^[1];

^[1]; Staebler, G. M. ^[1];

^[2]; Gong, X. ^[2]; Qian, J. ^[2];

^[2]

General Atomics, San Diego, CA (United States)
Chinese Academy of Sciences (CAS), Hefei (China)

Shafranov shift stabilization of turbulence creates a bifurcation in transport, leading to multiple confinement states in the high β_p scenario on DIII-D: an H-mode confinement state with a high edge pedestal, and an enhanced confinement state with a low pedestal and an internal transport barrier (ITB). The bifurcation is observed experimentally in the ion energy transport with respect to mid-radius (ρ=0.6) pressure gradient. Simultaneously, the electron transport exhibits a similar but less dramatic behavior with respect to pressure gradient. The Shafranov shift is found to increase at the same time as the transition to enhanced confinement, and quasilinear gyro-Landau fluid modeling shows a reduction of predicted energy flux consistent on-set of the ITB. Transient perturbations such as ELMs are likely a trigger for the transition between states by lowering the edge pressure and increasing mid-radius pressure gradient.

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Research Organization:: General Atomics, San Diego, CA (United States); Chinese Academy of Sciences (CAS), Hefei (China)

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

Grant/Contract Number:: FC02-04ER54698; SC0010685; 2015GB102002; 2015GB103000

OSTI ID:: 1569029

Journal Information:: Nuclear Fusion, Vol. 59, Issue 12; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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