Modelling of lower hybrid current drive and comparison with experimental results in JET

A new code has been developed and benchmarked with data from lower hybrid current drive (LHCD) experiments in JET. The model includes stochastic radial diffusion of electrons and scattering of lower hybrid (LH) waves. The code is validated by comparing calculated and experimental current drive efficiencies as well as calculated and measured hard X ray bremsstrahlung emission radial profiles. Reasonable agreement has been found for full LH current driven cases and LH plus moderate DC electric field

[1]  D. Moreau,et al.  Coupling of slow waves near the lower hybrid frequency in JET , 1990 .

[2]  Wagner,et al.  Temporal behavior of the plasma current distribution in the ASDEX tokamak during lower-hybrid current drive. , 1987, Physical review letters.

[3]  M. Cox,et al.  Solution of three-dimensional Fokker-Planck equations for tokamak plasmas using an operator splitting technique , 1991 .

[4]  M. Brambilla.  Ray tracing of lower hybrid and ion cyclotron waves , 1986 .

[5]  A. Weller,et al.  JET x-ray pulse-height analysis system , 1988 .

[6]  A. R. Esterkin,et al.  Analytical approach to lower hybrid ray tracing , 1992 .

[7]  R. A. Cairns,et al.  A ONE-DIMENSIONAL MODEL FOR LOWER HYBRID CURRENT DRIVE INCLUDING PERPENDICULAR DYNAMICS** , 1985 .

[8]  K. Kupfer,et al.  Wave chaos and the dependence of LHCD efficiency on temperature , 1992 .

[9]  V. I. Fedorov,et al.  Lower-hybrid wave propagation in tokamaks , 1980 .

[10]  C. Kessel,et al.  SIMULATIONS OF LOWER HYBRID CURRENT DRIVE IN SHAPED TOKAMAKS , 1994 .

[11]  H. Soltwisch.  Current distribution measurement in a tokamak by FIR polarimetry (invited) , 1986 .

[12]  P. T. Bonoli,et al.  Simulation model for lower hybrid current drive , 1986 .

[13]  Nathaniel J. Fisch,et al.  Theory of current-drive in plasmas , 1987 .

[14]  E. Ott.  Lower hybrid wave scattering by density fluctuations , 1979 .

[15]  Edward Ott,et al.  Toroidal and scattering effects on lower‐hybrid wave propagation , 1982 .

[16]  Y. Peysson,et al.  Determination of the suprathermal electron distribution function during lower hybrid current drive in JET , 1994 .

[17]  Stephen C. Jardin,et al.  Dynamic modelling of lower hybrid current drive , 1994 .

[18]  P. Bonoli,et al.  Simulations of current density profile control using lower hybrid current drive in the TdeV Tokamak , 1995 .

[19]  G. V. Pereverzev,et al.  Use of the multidimensional WKB method to describe propagation of lower hybrid waves in tokamak plasma , 1992 .

[20]  P. Liewer.  Measurements of microturbulence in tokamaks and comparisons with theories of turbulence and anomalous transport , 1985 .

[21]  X. Litaudon,et al.  Statistical theory of wave propagation and multipass absorption for current drive in tokamaks , 1993 .

[22]  P. T. Bonoli,et al.  Numerical modelling of lower hybrid RF heating and current drive experiments in the Alcator C tokamak , 1988 .

[23]  R. Slusher,et al.  Study of plasma density fluctuations by the correlation of crossed CO2 laser beams , 1980 .

[24]  G. Giruzzi.  Modelling of RF current drive in the presence of radial diffusion , 1993 .

[25]  Charles F. F. Karney,et al.  Numerical studies of current generation by radio‐frequency traveling waves , 1979 .

[26]  L. L. Lao,et al.  Equilibrium analysis of current profiles in tokamaks , 1990 .

[27]  D. Ignat.  Toroidal effects on propagation, damping, and linear mode conversion of lower hybrid waves , 1981 .

[28]  G. Vahala,et al.  Effect of magnetic and density fluctuations on the propagation of lower hybrid waves in tokamaks , 1992 .

[29]  Paul T. Bonoli,et al.  Modelling of lower hybrid current drive in self-consistent elongated tokamak equilibria , 1992 .

[30]  A R Esterkin,et al.  General properties of the lower hybrid ray trajectories in toroidal plasmas , 1992 .