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

Journal Article · · Nuclear Fusion
;  [1]
  1. Univ. of California, Los Angeles, CA (United States)
+ Show Author Affiliations
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.
Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1258508
Alternate ID(s):
OSTI ID: 1254193
Report Number(s):
LLNL--JRNL-679821
Journal Information:
Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 6 Vol. 56; ISSN 0029-5515
Publisher:
IOP ScienceCopyright Statement
Country of Publication:
United States
Language:
English

References (12)

Finite Beta Stabilization of the Drift-Cone Instability journal January 1972
Electrostatic Instabilities in Finite Mirror-Confined Plasmas journal January 1966
Electrostatic waves in an inhomogeneous collisionless plasma journal January 1976
Normal modes of a loss cone plasma slab with steep density gradient journal January 1977
A nonlocal analysis of drift and drift-cyclotron waves in cylindrical geometry journal January 1985
Nonlocal effects on the drift cyclotron loss cone dispersion relation in cylindrical geometry journal January 1987
Loss ion orbits at the tokamak edge journal October 1993
Direct ion orbit loss near the plasma edge of a divertor tokamak in the presence of a radial electric field journal July 1996
Intrinsic toroidal velocity near the edge of DIII-D H-mode plasmas journal July 2009
Plasma flow due to a loss-cone distribution centred around the outboard edge in DIII-D journal December 2011
Edge radial electric field structure in quiescent H-mode plasmas in the DIII-D tokamak journal April 2004
Bifurcation theory of poloidal rotation in tokamaks: A model for L-H transition journal November 1989

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY