Quasistationary Plasma Predator-Prey System of Coupled Turbulence, Drive, and Sheared Flow During High Performance DIII-D Tokamak Discharges [A New, Quasi-stationary Plasma Predator-Prey System of Coupled Turbulence, Drive, and Sheared Flow During High Performance DIII-D Tokamak Discharges]
Abstract
A new, long-lived limit cycle oscillation (LCO) regime has been observed in the edge of near zero torque high-performance DIII-D tokamak plasma discharges. These LCOs are localized and comprised of density turbulence, gradient drives, and E X B velocity shear damping (E and B are the local radial electric and total magnetic fields). Density turbulence sequentially acts as a predator (via turbulence transport) of profile gradients and a prey (via shear suppression) to the E X B velocity shear. Reported here for the first time, a unique spatiotemporal variation of the local E X B velocity which is found to be essential for the existence of this system. The LCO system is quasi-stationary, existing from 3 to 12 plasma energy confinement times (~30 to 900 LCO cycles) limited by hardware constraints. In conclusion, this plasma system appears to contribute strongly to the edge transport in these high-performance and transient-free plasmas as evident from oscillations in transport relevant edge parameters at LCO timescale.
- Authors:
-
- Univ. of California, Los Angeles, CA (United States)
- General Atomics, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1435650
- Alternate Identifier(s):
- OSTI ID: 1429938
- Grant/Contract Number:
- FC02-04ER54698; FG02-08ER54984
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 120; Journal Issue: 13; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; magnetic confinement fusion; nonlinear phenomena in plasmas; plasma turbulence
Citation Formats
Barada, Kshitish, Rhodes, Terry L., Burrell, Keith H., Zeng, L., Bardoczi, Laszlo, Chen, Xi, Muscatello, Christopher M., and Peebles, W. A. Quasistationary Plasma Predator-Prey System of Coupled Turbulence, Drive, and Sheared E×B Flow During High Performance DIII-D Tokamak Discharges [A New, Quasi-stationary Plasma Predator-Prey System of Coupled Turbulence, Drive, and Sheared E×B Flow During High Performance DIII-D Tokamak Discharges]. United States: N. p., 2018.
Web. doi:10.1103/PhysRevLett.120.135002.
Barada, Kshitish, Rhodes, Terry L., Burrell, Keith H., Zeng, L., Bardoczi, Laszlo, Chen, Xi, Muscatello, Christopher M., & Peebles, W. A. Quasistationary Plasma Predator-Prey System of Coupled Turbulence, Drive, and Sheared E×B Flow During High Performance DIII-D Tokamak Discharges [A New, Quasi-stationary Plasma Predator-Prey System of Coupled Turbulence, Drive, and Sheared E×B Flow During High Performance DIII-D Tokamak Discharges]. United States. https://doi.org/10.1103/PhysRevLett.120.135002
Barada, Kshitish, Rhodes, Terry L., Burrell, Keith H., Zeng, L., Bardoczi, Laszlo, Chen, Xi, Muscatello, Christopher M., and Peebles, W. A. Tue .
"Quasistationary Plasma Predator-Prey System of Coupled Turbulence, Drive, and Sheared E×B Flow During High Performance DIII-D Tokamak Discharges [A New, Quasi-stationary Plasma Predator-Prey System of Coupled Turbulence, Drive, and Sheared E×B Flow During High Performance DIII-D Tokamak Discharges]". United States. https://doi.org/10.1103/PhysRevLett.120.135002. https://www.osti.gov/servlets/purl/1435650.
@article{osti_1435650,
title = {Quasistationary Plasma Predator-Prey System of Coupled Turbulence, Drive, and Sheared E×B Flow During High Performance DIII-D Tokamak Discharges [A New, Quasi-stationary Plasma Predator-Prey System of Coupled Turbulence, Drive, and Sheared E×B Flow During High Performance DIII-D Tokamak Discharges]},
author = {Barada, Kshitish and Rhodes, Terry L. and Burrell, Keith H. and Zeng, L. and Bardoczi, Laszlo and Chen, Xi and Muscatello, Christopher M. and Peebles, W. A.},
abstractNote = {A new, long-lived limit cycle oscillation (LCO) regime has been observed in the edge of near zero torque high-performance DIII-D tokamak plasma discharges. These LCOs are localized and comprised of density turbulence, gradient drives, and E X B velocity shear damping (E and B are the local radial electric and total magnetic fields). Density turbulence sequentially acts as a predator (via turbulence transport) of profile gradients and a prey (via shear suppression) to the E X B velocity shear. Reported here for the first time, a unique spatiotemporal variation of the local E X B velocity which is found to be essential for the existence of this system. The LCO system is quasi-stationary, existing from 3 to 12 plasma energy confinement times (~30 to 900 LCO cycles) limited by hardware constraints. In conclusion, this plasma system appears to contribute strongly to the edge transport in these high-performance and transient-free plasmas as evident from oscillations in transport relevant edge parameters at LCO timescale.},
doi = {10.1103/PhysRevLett.120.135002},
journal = {Physical Review Letters},
number = 13,
volume = 120,
place = {United States},
year = {Tue Mar 27 00:00:00 EDT 2018},
month = {Tue Mar 27 00:00:00 EDT 2018}
}
Web of Science
Figures / Tables:
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Works referencing / citing this record:
An experimental investigation of blob behaviors in lower hybrid wave dominant heating scenarios on EAST
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Long-lived predator-prey dynamics in the pedestal of near-zero torque high performance DIII-D plasmas
journal, September 2019
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- Physics of Plasmas, Vol. 26, Issue 9
Figures / Tables found in this record: