Core electron temperature turbulence and transport during sawtooth oscillations in the DIII-D tokamak

Wang, G.; Rhodes, T. L.; Pratt, Q. T.; Peebles, W. A.; Crocker, N. A.; Hong, R.; Austin, M. E.; Van Zeeland, M. A.; Smith, S. P.

doi:10.1088/1741-4326/ad4046

Title: Core electron temperature turbulence and transport during sawtooth oscillations in the DIII-D tokamak

Journal Article · 08 May 2024 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ad4046 · OSTI ID:2346258

^[1];

^[1]; Peebles, W. A. ^[1];

^[1];

^[1]; Austin, M. E. ^[2];

^[3]; Smith, S. P. ^[3]

University of California, Los Angeles, CA (United States)
University of Texas at Austin, TX (United States)
General Atomics, San Diego, CA (United States)

Sawteeth are one of the concerning instabilities in ITER and future burning plasma experiments. Sawtooth dynamics and its interaction with broadband plasma turbulence has been a challenge for predictive simulations of core transport in future fusion devices. This study provides new observations of core turbulence behavior during sawtooth oscillations in DIII-D hydrogen L-mode neutral beam injection heated plasmas in an inner wall limited configuration. A strong correlation of electron temperature and density turbulence levels with the sawtooth oscillation phase has been observed at locations inside the T_e inversion radius and/or safety factor q = 1 magnetic surface. The T_e turbulence amplitude in the core during the sawtooth ramp exhibits a critical T_e gradient behavior inside but not near the T_e inversion radius/q = 1 magnetic surface. The most unstable mode calculated from the trapped gyro-landau fluid turbulence simulations reveal a change from low-k ion-type to low-k electron-type modes from pre- to post- sawtooth crash time periods.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE

Grant/Contract Number:: FC02-04ER54698; SC0019352; FG02-97ER54415

OSTI ID:: 2346258

Alternate ID(s):: OSTI ID: 2338220; OSTI ID: 2349354

Journal Information:: Nuclear Fusion, Vol. 64, Issue 6; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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