Dynamic Confinement of ITER Plasma by O-Mode Driver at Electron Cyclotron Frequency Range

A low B-field side launched electron cyclotron O-Mode driver\footnote{R. Prater et. al., \textit{Nucl. Fusion} 48, No 3 (March 2008).} leads to the dynamic rf confinement, in addition to rf turbulent heating, of ITER\footnote{E. P. Velikhov, History of the Russian Tokamak and the Tokamak Thermonuclear Fusion Research Worldwide That Led to ITER (Documentary movie; Stefan Studios Int'l, La Jolla, CA, 2008; {\copyright} E. P. Velikhov, V. Stefan.)} plasma. The scaling law for the local energy confinement time $\tau _{E}$ is evaluated ($\tau _{E}$ $\sim $ 3n$_{e}$T$_{e}$/2Q, where (3/2) n$_{e}$T$_{e}$ is the local plasma thermal energy density and Q is the local rf turbulent heating rate). The dynamics of unstable dissipative trapped particle modes (DTPM)\footnote{M N Rosenbluth, \textit{Phys. Scr.} T2A 104-109 ~ 1982}$^,$\footnote{B. B. Kadomtsev and O. P. Pogutse, Nucl. Fusion 11, 67 (1971).} strongly coupled to Trivelpiece-Gould (T-G) modes is studied for gyrotron frequency 170GHz; power$\sim $24 MW CW; and on-axis B-field $\sim $ 10T. In the case of dynamic stabilization of DTPM turbulence and for the heavily damped T-G modes, the energy confinement time scales as $\tau _{E}\sim $(I$_{0})^{-2}$, whereby I$_{0}$(W/m$^{2})$ is the O-Mode driver irradiance.