Poloidal inhomogeneity of turbulence in the FT-2 tokamak by radial correlation Doppler reflectometry and gyrokinetic modelling

The poloidal dependence of the drift-wave turbulence characteristics is investigated at the FT-2 tokamak by radial correlation Doppler reflectometry (RCDR) technique and using the full distribution function global gyrokinetic modelling by ELMFIRE code. The poloidal variation of the turbulence radial correlation length from 0.2–0.55 cm is demonstrated both by measurement and computation. The turbulence correlation length rapidly decreases from the top of the poloidal cross-section to the high field side and then steadily grows in the poloidal direction. A well-pronounced excess of the turbulence radial correlation length in deuterium over its value in hydrogen discharges is demonstrated.

[1]  D. Brower,et al.  The spectrum, spatial distribution and scaling of microturbulence in the TEXT tokamak , 1987 .

[2]  H. Zohm,et al.  Radial correlation length measurements on ASDEX Upgrade using correlation Doppler reflectometry , 2007 .

[3]  Brian James Albright,et al.  Fast ignition with laser-driven proton and ion beams , 2014 .

[4]  Observation of the ETG mode component of tokamak plasma turbulence by the UHR backscattering diagnostics , 2007 .

[5]  B. Vowinkel,et al.  Correlation reflectometry at TEXTOR. , 2010, The Review of scientific instruments.

[6]  E. Doyle,et al.  Quantitative density fluctuation measurements utilizing quadrature reflectometers on DIII-D , 2006 .

[7]  A. Sips,et al.  Recent developments in microwave reflectometry at JET (invited) , 1990 .

[8]  N. Kosolapova,et al.  Fluctuation reflectometry theory and the possibility of turbulence wave number spectrum reconstruction using the radial correlation reflectometry data , 2011 .

[9]  Nazikian,et al.  Radial scale length of turbulent fluctuations in the main core of TFTR plasmas. , 1993, Physical review letters.

[10]  E. Z. Gusakov,et al.  Radial correlation reflectometry at oblique probing wave incidence (linear scattering theory predictions) , 2014 .

[11]  S. Janhunen,et al.  Anomalous transport and multi-scale drift turbulence dynamics in tokamak ohmic discharge as measured by high resolution diagnostics and modeled by full-f gyrokinetic code , 2013 .

[12]  V. A. Kornev,et al.  Fusion Research in Ioffe Institute , 2015 .

[13]  X. Garbet,et al.  Recent results on turbulence and MHD activity achieved by reflectometry , 2006 .

[14]  E. Blanco,et al.  Two-dimensional full-wave simulations of radial correlation Doppler reflectometry in linear and non-linear regimes , 2013 .

[15]  S. E. Lysenko,et al.  Recent results of the T-10 tokamak , 2011 .

[16]  N. Teplova,et al.  2D modeling of turbulence wave number spectra reconstruction from radial correlation reflectometry data , 2015 .

[17]  R. Fonck,et al.  Plasma fluctuation measurements in tokamaks using beam‐plasma interactions , 1990 .

[18]  I. Hutchinson.  One-dimensional full-wave analysis of reflectometry sensitivity and correlations , 1992 .

[19]  L. Vermare,et al.  Full-wave test of the radial correlation reflectometry analytical theory in linear and nonlinear regimes , 2006 .

[20]  E. Gusakov,et al.  Two-dimensional linear theory of radial correlation reflectometry diagnostics , 2002 .

[21]  S. Janhunen,et al.  Multiscale investigations of drift-wave turbulence and plasma flows: measurements and total-distribution-function gyrokinetic simulations. , 2012, Physical review letters.

[22]  X. Garbet,et al.  CORRIGENDUM: Up-down asymmetries of density fluctuations in Tore Supra , 1999 .

[23]  E. Blanco,et al.  Study of Doppler reflectometry capability to determine the perpendicular velocity and the k-spectrum of the density fluctuations using a 2D full-wave code , 2008 .

[24]  E. Doyle,et al.  Poloidally asymmetric response of turbulence to the H mode on the CCT tokamak , 1993 .

[25]  D. Brower,et al.  Poloidal asymmetry and gradient drive in core electron density and temperature fluctuations on the Texas Experimental Tokamak‐Upgrade , 1996 .

[26]  E. Gusakov,et al.  The two-dimensional theory of reflectometry diagnostics of plasma fluctuations , 1997 .