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: PP11.00034 : Transport barrier for spinning blobs in magnetically confined plasmas*
Presenter:
Junyi Cheng
(University of Colorado, Boulder)
Authors:
Junyi Cheng
(University of Colorado, Boulder)
James R Myra
(Lodestar Research Corporation)
Scott E Parker
(University of Colorado, Boulder)
Seung Hoe Ku
(Princeton Plasma Physics Laboratory)
Robert Hager
(Princeton Plasma Physics Laboratory)
Choongseok Chang
(Princeton Plasma Physics Laboratory)
Here, we construct a new theoretical framework to interpret the transport barrier. Rather than the conventional fluid blob theory, our theory includes the ExB motion in the parallel Ohm’s law since the spin dominates the blob motion. The potential from the adiabatic response is in the zero-order while the dipole potential is in the next order. It shows that blob radial motion in response to the zonal electrostatic potential acts as to be attracted to a potential well as if the blobs were a positive charge, which is consistent with our simulations.
In this work, based on the simulations, we construct a new theoretical framework to explain the transport barrier is induced by the zonal field effect on the spinning blob motion, which is the potential explanation for the negative radial velocity of blobs in experiments [2,3]. The transport barrier is also calculated with realistic parameters in experiments, which agrees with our theoretical prediction.
[1] S. Ku et al, Phys. Plasmas 25, 056107 (2018)
[2] C. K. Tsui et al., Physics of Plasmas 25, 072506 (2018)
[3] S J Zweben et al., Plasma Phys. Control. Fusion 58, 044007 (2016)
*SciDAC-HBPS
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