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Title: Stability of drift-cyclotron loss-cone waves in H-mode plasmas

The drift-cyclotron loss-cone mode was first studied in mirror machines. In such devices, particles with small pitch angles are not confined, creating a hole in the velocity distribution function that is a source of free energy and leads to micro-instabilities in the cyclotron-range of frequencies. In the edge region of tokamak devices operating under H-mode conditions, ion loss also occurs. In this case, gradient drift carries ions moving opposite to the plasma current preferentially into the divertor, creating a one-sided loss cone. A simple analysis shows that for the quiescent H-mode plasmas in DIII-D the critical gradient for instability is exceeded within 2 cm of the separatrix, and the maximum growth rate at the separatrix is 3×10 7 s -1.
Authors:
;  [1]
  1. Univ. of California, Los Angeles, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-679821
Journal ID: ISSN 0029-5515
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 56; Journal Issue: 6; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION
OSTI Identifier:
1258508
Alternate Identifier(s):
OSTI ID: 1254193

Farmer, W. A., and Morales, G. J.. Stability of drift-cyclotron loss-cone waves in H-mode plasmas. United States: N. p., Web. doi:10.1088/0029-5515/56/6/064003.
Farmer, W. A., & Morales, G. J.. Stability of drift-cyclotron loss-cone waves in H-mode plasmas. United States. doi:10.1088/0029-5515/56/6/064003.
Farmer, W. A., and Morales, G. J.. 2016. "Stability of drift-cyclotron loss-cone waves in H-mode plasmas". United States. doi:10.1088/0029-5515/56/6/064003. https://www.osti.gov/servlets/purl/1258508.
@article{osti_1258508,
title = {Stability of drift-cyclotron loss-cone waves in H-mode plasmas},
author = {Farmer, W. A. and Morales, G. J.},
abstractNote = {The drift-cyclotron loss-cone mode was first studied in mirror machines. In such devices, particles with small pitch angles are not confined, creating a hole in the velocity distribution function that is a source of free energy and leads to micro-instabilities in the cyclotron-range of frequencies. In the edge region of tokamak devices operating under H-mode conditions, ion loss also occurs. In this case, gradient drift carries ions moving opposite to the plasma current preferentially into the divertor, creating a one-sided loss cone. A simple analysis shows that for the quiescent H-mode plasmas in DIII-D the critical gradient for instability is exceeded within 2 cm of the separatrix, and the maximum growth rate at the separatrix is 3×107 s-1.},
doi = {10.1088/0029-5515/56/6/064003},
journal = {Nuclear Fusion},
number = 6,
volume = 56,
place = {United States},
year = {2016},
month = {5}
}