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Title: Wave kinetics of drift-wave turbulence and zonal flows beyond the ray approximation

Journal Article · · Physical Review E
 [1];  [2];  [3];  [1]
  1. Princeton Univ., Princeton, NJ (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Inhomogeneous drift-wave turbulence can be modeled as an effective plasma where drift waves act as quantumlike particles and the zonal-flow velocity serves as a collective field through which they interact. This effective plasma can be described by a Wigner-Moyal equation (WME), which generalizes the quasilinear wave-kinetic equation (WKE) to the full-wave regime, i.e., resolves the wavelength scale. Unlike waves governed by manifestly quantumlike equations, whose WMEs can be borrowed from quantum mechanics and are commonly known, drift waves have Hamiltonians very different from those of conventional quantum particles. This causes unusual phase-space dynamics that is typically not captured by the WKE. We demonstrate how to correctly model this dynamics with the WME instead. Specifically, we report full-wave phase-space simulations of the zonal-flow formation (zonostrophic instability), deterioration (tertiary instability), and the so-called predator-prey oscillations. We also show how the WME facilitates analysis of these phenomena, namely, (i) we show that full-wave effects critically affect the zonostrophic instability, particularly its nonlinear stage and saturation; (ii) we derive the tertiary-instability growth rate; and (iii) we demonstrate that, with full-wave effects retained, the predator-prey oscillations do not require zonal-flow collisional damping, contrary to previous studies. In conclusion, we also show how the famous Rayleigh-Kuo criterion, which has been missing in wave-kinetic theories of drift-wave turbulence, emerges from the WME.

Research Organization:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-09CH11466; NA0003525
OSTI ID:
1440782
Alternate ID(s):
OSTI ID: 1439383
Journal Information:
Physical Review E, Vol. 97, Issue 5; ISSN 2470-0045
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (7)

On the Rayleigh–Kuo criterion for the tertiary instability of zonal flows journal August 2018
On the structure of the drifton phase space and its relation to the Rayleigh–Kuo criterion of the zonal-flow stability journal July 2018
Formation of solitary zonal structures via the modulational instability of drift waves journal May 2019
Nonlinear saturation and oscillations of collisionless zonal flows text January 2019
Nonlinear saturation and oscillations of collisionless zonal flows journal June 2019
Nonlinear saturation and oscillations of collisionless zonal flows text January 2019
On the Rayleigh--Kuo criterion for the tertiary instability of zonal flows text January 2018

Figures / Tables (5)