Validation of Alfvén Eigenmode simulations on DIII-D and Projection for CFETR scenario

Zou, Yunpeng; Chan, Vincent S.; Huang, Juan; Collins, C. S.; Andrea, A. M.; Guo, W. F.; Ye, Minyou

doi:10.1088/1741-4326/ab1300

Validation of Alfvén Eigenmode simulations on DIII-D and Projection for CFETR scenario

Journal Article · Mon Mar 25 00:00:00 EDT 2019 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ab1300· OSTI ID:1481885

Zou, Yunpeng ^[1]; Chan, Vincent S. ^[2]; Huang, Juan ^[3]; Collins, C. S. ^[4]; Andrea, A. M. ^[4]; Guo, W. F. ^[3]; Ye, Minyou ^[5]

University of Science and Technology of China, Hefei (China). School of Physics; General Atomics
University of Science and Technology of China, Hefei (China). School of Physics; General Atomics, San Diego, CA (United States)
Chinese Academy of Sciences, Hefei (China). Institute of Plasma Physics
General Atomics, San Diego, CA (United States)
University of Science and Technology of China, Hefei (China). School of Physics

Alfvén Eigenmodes (AEs) are driven unstable by on-axis neutral beam (NB) injection in DIII-D reversed magnetic shear discharges #166496 and #159243, a high-beta steady-state demonstration discharge and an L-mode current ramp discharge respectively. Here, the experimental results are used to validate the ideal MHD code with kinetic extensions NOVA-K and the gyro-Landau-fluid code TGLFEP. Both codes predict low toroidal mode number (n=1~2) Toroidal Alfvén Eigenmode (TAE) instability in the former discharge and low-n (n=2~6) Reverse Shear Alfvén Eigenmode (RSAE) instability in the latter discharge, consistent with observations. The same two codes are also employed to predict linear AE instabilities driven by α particles in the China Fusion Engineering Test Reactor (CFETR). For the CFETR reversed shear q profile, the growth rates of AEs change periodically with increasing toroidal mode number and the RSAEs near a rational surface always have larger growth rates than TAEs. AEs are found to be further destabilized by addition of 500keV off-axis injected NB. The effects of q-profile variation on AE stability in CFETR are also investigated and the results show that raising q_min can further destabilize RSAEs, while increasing q₀ with fixed q_min, to create stronger negative magnetic shear, is stabilizing. Finally, increasing plasma density is beneficial for AE stability due to reduced fast ion drive because of shorter slowing down time and higher electron collisional damping.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: FC02-04ER54698; SC0017992

OSTI ID:: 1481885

Alternate ID(s):: OSTI ID: 22929740

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 6 Vol. 59; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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