skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Double tearing modes in the presence of internal transport barrier

Abstract

The linear characteristics of double tearing modes (DTMs) in the presence of internal transport barrier (ITB) are investigated in a cylindrical tokamak plasma. A simple model describing density profile of ITB is suggested. Combining the safety factor profile given by Bierwage et al.[Phys. Plasmas 12, 082504 (2005); 14, 022107 (2007)], the DTMs spectra, scaling laws, and relationships between growth rate and density profile factor in the presence of ITB are studied, respectively. The results show that the resistive drift instability occurs in the case of high poloidal mode numbers. A transition from DTMs to the resistive drift instability is observed, and the dependence of DTMs growth rate on the magnetic Reynolds number has changed greatly due to the presence of ITB. In addition, the linear growth rates of the modes including those with low and high poloidal mode number increase when the plasma density profile steepens in the presence of ITB whatever the inter-resonant distance is smaller or larger.

Authors:
;  [1]; ;  [2]
  1. Sichuan University, Chengdu 610064 (China)
  2. Southwestern Institute of Physics, Chengdu 610041 (China)
Publication Date:
OSTI Identifier:
22046885
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 18; Journal Issue: 7; Other Information: (c) 2011 American Institute of Physics; 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; CHARGED-PARTICLE TRANSPORT; CYLINDRICAL CONFIGURATION; DRIFT INSTABILITY; MAGNETIC CONFINEMENT; MAGNETIC REYNOLDS NUMBER; MAGNETOHYDRODYNAMICS; PLASMA; PLASMA DENSITY; SCALING LAWS; TEARING INSTABILITY; THERMAL BARRIERS; TOKAMAK DEVICES

Citation Formats

Zhao, X. M., Tang, C. J., Peng, X. D., and Qiu, X. M. Double tearing modes in the presence of internal transport barrier. United States: N. p., 2011. Web. doi:10.1063/1.3613663.
Zhao, X. M., Tang, C. J., Peng, X. D., & Qiu, X. M. Double tearing modes in the presence of internal transport barrier. United States. doi:10.1063/1.3613663.
Zhao, X. M., Tang, C. J., Peng, X. D., and Qiu, X. M. Fri . "Double tearing modes in the presence of internal transport barrier". United States. doi:10.1063/1.3613663.
@article{osti_22046885,
title = {Double tearing modes in the presence of internal transport barrier},
author = {Zhao, X. M. and Tang, C. J. and Peng, X. D. and Qiu, X. M.},
abstractNote = {The linear characteristics of double tearing modes (DTMs) in the presence of internal transport barrier (ITB) are investigated in a cylindrical tokamak plasma. A simple model describing density profile of ITB is suggested. Combining the safety factor profile given by Bierwage et al.[Phys. Plasmas 12, 082504 (2005); 14, 022107 (2007)], the DTMs spectra, scaling laws, and relationships between growth rate and density profile factor in the presence of ITB are studied, respectively. The results show that the resistive drift instability occurs in the case of high poloidal mode numbers. A transition from DTMs to the resistive drift instability is observed, and the dependence of DTMs growth rate on the magnetic Reynolds number has changed greatly due to the presence of ITB. In addition, the linear growth rates of the modes including those with low and high poloidal mode number increase when the plasma density profile steepens in the presence of ITB whatever the inter-resonant distance is smaller or larger.},
doi = {10.1063/1.3613663},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 7,
volume = 18,
place = {United States},
year = {2011},
month = {7}
}