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Title: Turbulence elasticity—A new mechanism for transport barrier dynamics

Abstract

We present a new, unified model of transport barrier formation in “elastic” drift wave-zonal flow (DW-ZF) turbulence. A new physical quantity—the delay time (i.e., the mixing time for the DW turbulence)—is demonstrated to parameterize each stage of the transport barrier formation. Quantitative predictions for the onset of limit-cycle-oscillation (LCO) among DW and ZF intensities (also denoted as I-mode) and I-mode to high-confinement mode (H-mode) transition are also given. The LCO occurs when the ZF shearing rate (|〈v〉{sub ZF}{sup ′}|) enters the regime Δω{sub k}<|〈V〉{sub ZF}{sup ′}|τ{sub cr}{sup −1}, where the mean E × B shear flow driven by ion pressure “locks” the DW-ZF system to the H-mode by reducing the delay time below the threshold value.

Authors:
 [1];  [1];  [2];  [3];  [4]
  1. WCI Center for Fusion Theory, NFRI, Daejeon 305-333 (Korea, Republic of)
  2. (United States)
  3. IAS and RIAM, Kyushu University, Kasuga 816-8580 (Japan)
  4. LPP, Ecole Polytechnique, CNRS, Palaiseau Cedex 91128 (France)
Publication Date:
OSTI Identifier:
22303606
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 21; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CUPRATES; DIFFUSION BARRIERS; H-MODE PLASMA CONFINEMENT; LANTHANUM COMPOUNDS; LIMIT CYCLE; SHEAR; TIME DELAY; TURBULENCE; UNIFIED MODEL; WAVE PROPAGATION

Citation Formats

Guo, Z. B., E-mail: guozhipku@gmail.com, Diamond, P. H., CMTFO and CASS, University of California, San Diego, California 92093, Kosuga, Y., and Gürcan, Ö. D. Turbulence elasticity—A new mechanism for transport barrier dynamics. United States: N. p., 2014. Web. doi:10.1063/1.4894695.
Guo, Z. B., E-mail: guozhipku@gmail.com, Diamond, P. H., CMTFO and CASS, University of California, San Diego, California 92093, Kosuga, Y., & Gürcan, Ö. D. Turbulence elasticity—A new mechanism for transport barrier dynamics. United States. doi:10.1063/1.4894695.
Guo, Z. B., E-mail: guozhipku@gmail.com, Diamond, P. H., CMTFO and CASS, University of California, San Diego, California 92093, Kosuga, Y., and Gürcan, Ö. D. Mon . "Turbulence elasticity—A new mechanism for transport barrier dynamics". United States. doi:10.1063/1.4894695.
@article{osti_22303606,
title = {Turbulence elasticity—A new mechanism for transport barrier dynamics},
author = {Guo, Z. B., E-mail: guozhipku@gmail.com and Diamond, P. H. and CMTFO and CASS, University of California, San Diego, California 92093 and Kosuga, Y. and Gürcan, Ö. D.},
abstractNote = {We present a new, unified model of transport barrier formation in “elastic” drift wave-zonal flow (DW-ZF) turbulence. A new physical quantity—the delay time (i.e., the mixing time for the DW turbulence)—is demonstrated to parameterize each stage of the transport barrier formation. Quantitative predictions for the onset of limit-cycle-oscillation (LCO) among DW and ZF intensities (also denoted as I-mode) and I-mode to high-confinement mode (H-mode) transition are also given. The LCO occurs when the ZF shearing rate (|〈v〉{sub ZF}{sup ′}|) enters the regime Δω{sub k}<|〈V〉{sub ZF}{sup ′}|τ{sub cr}{sup −1}, where the mean E × B shear flow driven by ion pressure “locks” the DW-ZF system to the H-mode by reducing the delay time below the threshold value.},
doi = {10.1063/1.4894695},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 9,
volume = 21,
place = {United States},
year = {2014},
month = {9}
}