Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session PP11: Poster Session VI: In-Person, Hall A (2:00-3:30pm) and Virtual Poster Presentations (3:45-5:00pm)
MFE: Diagnostics; Edge and Pedestal; Stability; Heating; Transport, Turbulence
ASTRO: Astrophysical Plasma
2:00 PM - 5:00 PM
Wednesday, October 19, 2022
Room: Exhibit Hall A and Online
Abstract: PP11.00046 : Nonlinear simulation with strong Internal transport barrier and weak External transport barrier under the BOUT++ Gyro-Landau-Fluid code*
Presenter:
Pengfei Li
(Peking Univ)
Authors:
Pengfei Li
(Peking Univ)
Xueqiao Xu
(Lawrence Livermore National Laboratory, Livermore, California 94551, USA)
S. Ding
(3General Atomics, P.O. Box 85608, San Diego, California, 92186-5608, USA)
Andrea M. Garofalo
(General Atomics - San Diego)
BOUT++ GLF simulations are performed for ITER’s Q=10 high βP scenario with strong ITB and weak ETB. Here the ITB stands for internal transport barrier and the ETB stands for external transport barrier. In the linear simulation the KBMs are 2nd stable inside ITB and ETB. However, the KBMs are unstable in the region between ITB and ETB. We find that the mode number of the instabilities is mainly in the region n>50 and the growth rate decreases slowly vs k⊥ρi only in the region where k⊥ρi~1, because of the weak stabilizing finite Larmor radius effect for high-n instabilities. In the nonlinear simulation, the KBMs develop in the region between the ITB and ETB, therefore flattening the profile there which is consistent with the linear local TGLF results. With the flattening of the pressure profile, the turbulence spreads to the ITB bottom and the whole ETB region. The large bootstrap current in the ITB contributes to the large negative magnetic shear, which makes the KBM in deep 2nd stable region and prevent the turbulence spread into the ITB region. But the bootstrap current in the ETB is not so large as that of the ITB, and the magnetic shear decreases to a small positive number. So the turbulence can spread into the whole ETB region which contributes to the transport in the ETB.
*Performed under the auspices of the U.S.DOE by the LLNL under contract DE-AC52-07NA27344 and also supported by the National Key R&D Program of China Nos. 2017YFE0301100, 2017YFE0301101.
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