ITER Plasma at Ion Cyclotron Frequency Domain: The Fusion Alpha Particles Diagnostics Based on the Stimulated Raman Scattering of Fast Magnetosonic Wave off High Harmonic Ion Bernstein Modes

A novel method for alpha particle diagnostics is proposed. The theory of stimulated Raman scattering, SRS,\footnote{ V. Alexander Stefan, ITER Plasma at Electron Cyclotron Frequency Domain: Tokamak Core Plasma Diagnostics Based on the Synergy of Stimulated Raman and Brillouin Scatterings, Bulletin of the American Physical Society , 54th Annual Meeting of the APS Division of Plasma Physics, Volume 57, Number 12, 2012; Abstract: TO6.00010} of the fast wave and ion Bernstein mode, IBM, turbulence in multi-ion species plasmas\footnote{ V. Alexander Stefan, \textit{Nonlinear Electromagnetic Radiation Plasma Interactions}, (Stefan University Press, La Jolla, CA, 2008).} is utilized for the diagnostics of fast ions, (4)He ($+$2), in ITER\footnote{ E. P. Velikhov, (Kurchatov Institute, Moscow, Russia), private communication in La Jolla, CA, 2007.} plasmas. Nonlinear Landau damping of the IBM on fast ions near the plasma edge leads to the space-time changes in the turbulence level, (inverse alpha particle channeling). The space-time monitoring of the IBM turbulence via the SRS techniques may prove efficient for the real time study of the fast ion velocity distribution function, spatial distribution, and transport.