The ITER-Core Turbulent Plasma Diagnostics Based on Multi-Frequency-Laser-Beam Thomson Scattering

A novel ITER-core turbulent-plasma-diagnostic method is proposed based on the multi laser beam Thomson scattering, during the nonlinear electron cyclotron plasma heating (with on-axis B-field of \quad 10T).$^{\mathrm{\thinspace }}$\footnote{ G. S. Kurskiev $^{\mathrm{\thinspace }}$et. al., Nuclear Fusion, Volume 55, Number 5 (2015); P. Nielsen, C. Gowers and H. Salzmann,$^{\mathrm{,\thinspace }}$Journal of Instrumentation, Volume 12, July 2017} \footnote{ V. Alexander Stefan, APS-DPP-2009, (K1.00028); APS-DPP-2010, (DPP10-2010-000167); APS-DPP-2014(CP8.00010); V. Stefan, B. I. Cohen, C. Joshi, \textit{Science}, 243, 4890, (1989); V. Alexander Stefan, Unified theory of parametric excitations in magnetized plasma produced by the action of nonmonochromatic driver pump. II. Multiple driver pump, The Physics of Fluids 26, 1797 (1983)} Nonlinear electron cyclotron plasma heating leads to the excitation of electron-Bernstein mode turbulence in the ITER core-plasma, influencing electron temperature and electron density profile. Under these conditions, the use of multi-frequency-laser-beam may prove to be an effective core-plasma diagnostic method for nonstationary plasma turbulence.\footnote{ V. V. Pustovalov and V.P. Silin, Nonstationary plasma turbulence in parametric resonances, Soviet Physics Technical Physics, vol. 20, no. 12, 1976, p. 1544-1548; V. P. Silin and V.T. Tikhonchuk, Parametric plasma turbulence Physics Reports, \textbf{135}, 1, April 1986, Pages 1-46\par \par \par \par }