Author/Authors :
Saito، نويسنده , , T. and Kiwamoto، نويسنده , , Y. and Tatematsu، نويسنده , , Y. and Yoshimura، نويسنده , , Y. and Takahashi، نويسنده , , T. and Kasugai، نويسنده , , A. and Kira، نويسنده , , F. and Katanuma، نويسنده , , I. and Yamaguchi، نويسنده , , N. and Tamano، نويسنده , , T.، نويسنده ,
Abstract :
Two aspects of ECRH experiments in the GAMMA 10 tandem mirror are described. One is hot electron production in a minimum-B anchor cell by second harmonic ECRH. When a resonance region is located at the centre of the anchor cell, hot electrons are piled up near the centre region and the β-value attains more than 20%. For off-centre resonance, hot electrons have a spatial profile like a baseball seam. This profile is explained by a drift orbit of an electron in a minimum-B field. The other topic is observation of an intense axial electron flow with energy from hundreds of eV to a few keV generated by fundamental ECRH in the end cells. The force due to the fundamental ECRH driving heated electrons into the mirror loss cone is particularly strong. A bounce averaged Fokker-Planck code with a quasi-linear diffusion operator reproduces the electron flow with the same energies. The electron flow is a predominant ingredient for generation of the electrostatic potential in the GAMMA 10.
