Effects of anomalous transport on lower hybrid electron heating
The transport of electron energy out of tokamaks is known to be far greater than that calculated using classical and neoclassical theory. However, low levels of non-axisymmetric magnetic field turbulence can couple the fast transport of electrons parallel to the magnetic field lines to radial transport, thus providing a plausible explanation for observed energy confinement. These models further predict that the electron loss rate is proportional to v/sub parallel bars/. This has subsequently been found to be consistent with data for runaway electrons in PLT, at energies up to 1 MeV. Recently it has been pointed out by Chan, Chiu and Ohkawa that anomalous transport processes should be taken into account in attempting to determine steady state electron distribution functions for cases involving RF electron tail heating, particularly in view of the v/sub parallel bars/ dependence of the loss rate. In this work these physical processes are modeled through a 2-D nonlinear program which describes the evolution of the electron distribution function in velocity magnitude; (v) and plasma radius (r), and which studies the efficiency of tail electron heating.
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore National Lab.; General Atomic Co., San Diego, CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6591031
- Report Number(s):
- UCRL-85255; CONF-810214-3; TRN: 81-006479
- Resource Relation:
- Conference: 4. topical conference on radio frequency plasma heating, Austin, TX, USA, 9 Feb 1981
- Country of Publication:
- United States
- Language:
- English
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