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Title: An analytic model for limiting high density LH transition by the onset of the tertiary instability

Abstract

We perform an analytic study of the tertiary instability driven by a strong excitation of zonal flows during high density low to high (LH) mode transition. The drift resistive ballooning mode is assumed to be a dominant edge turbulence driver. The analysis reproduces main qualitative features of early computational results [Rogers and Drake, Phys. Rev. Lett. 81, 4396 (1998); Guzdar et al., Phys. Plasmas 14, 020701 (2007)], as well as new characteristics of the maximum edge density due to the onset of the tertiary instability. An analytical scaling indicates that the density scaling of LH transition power may be determined by the onset condition of the tertiary instability when the operating density approaches to the Greenwald density.

Authors:
; ;  [1]
  1. National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22600035
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 7; Other Information: (c) 2016 Author(s); 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; BALLOONING INSTABILITY; DENSITY; EXCITATION; PLASMA; SCALING; TURBULENCE

Citation Formats

Singh, Raghvendra, E-mail: rsingh129@gmail.com, Jhang, Hogun, and Kaang, Helen H. An analytic model for limiting high density LH transition by the onset of the tertiary instability. United States: N. p., 2016. Web. doi:10.1063/1.4958646.
Singh, Raghvendra, E-mail: rsingh129@gmail.com, Jhang, Hogun, & Kaang, Helen H. An analytic model for limiting high density LH transition by the onset of the tertiary instability. United States. doi:10.1063/1.4958646.
Singh, Raghvendra, E-mail: rsingh129@gmail.com, Jhang, Hogun, and Kaang, Helen H. Fri . "An analytic model for limiting high density LH transition by the onset of the tertiary instability". United States. doi:10.1063/1.4958646.
@article{osti_22600035,
title = {An analytic model for limiting high density LH transition by the onset of the tertiary instability},
author = {Singh, Raghvendra, E-mail: rsingh129@gmail.com and Jhang, Hogun and Kaang, Helen H.},
abstractNote = {We perform an analytic study of the tertiary instability driven by a strong excitation of zonal flows during high density low to high (LH) mode transition. The drift resistive ballooning mode is assumed to be a dominant edge turbulence driver. The analysis reproduces main qualitative features of early computational results [Rogers and Drake, Phys. Rev. Lett. 81, 4396 (1998); Guzdar et al., Phys. Plasmas 14, 020701 (2007)], as well as new characteristics of the maximum edge density due to the onset of the tertiary instability. An analytical scaling indicates that the density scaling of LH transition power may be determined by the onset condition of the tertiary instability when the operating density approaches to the Greenwald density.},
doi = {10.1063/1.4958646},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 7,
volume = 23,
place = {United States},
year = {2016},
month = {7}
}