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M. Ichimura, H. Hojo, K. Ishii, A. Mase,
Y. Nakashima, T. Saito, T. Tamano, K. Yatsu
Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
Abstract. Radio frequency waves in the ion cyclotron range of frequency (ICRF)
are mainly used for the plasma production and heating in the central cell of
the GAMMA 10 tandem mirror. The GAMMA 10 has minimum-B anchor cells with a
non-axisymmetric magnetic field configuration. The ICRF heating system in the
central cell has been improved to create a more axisymmetric plasma. A high
ion temperature is attained with the system and high energy ions more than 50
keV are detected in both parallel and perpendicular directions to the magnetic
field line. Strong temperature anisotropy is observed and strong Alfvén ion
cyclotron (AIC) modes are excited due to the anisotropy. With the AIC modes,
high energy ions detected at the end increase and high energy ions with nearly
90 degrees pitch angle in the central cell decrease.
IAEA 2001
