MEASUREMENTS ON ROTATING ION-CYCLOTRON RANGE OF FREQUENCIES INDUCED PARTICLE FLUXES IN AXISYMMETRICAL MIRROR PLASMAS

A comparison of phenomenological features of plasmas is made with a sp ecial emphasis on radio-frequency induced transport, which are maintai ned when a set of two closely spaced dual half-turn antennas in a cent ral cell of the Phaedrus-B axisymmetric tandem mirror [J. J. Browning et al., Phys. Fluids B 1, 1692 (1984)] is phased to excite electromagn etic fields in the ion cyclotron range of frequencies (ICRF) with m = -1 (rotating with ions) and m = +1 (rotating with electrons) azimuthal modes. Positive and negative electric currents are measured to flow a xially to the end walls in the cases of m = -1 and m = +1 excitations, respectively. These parallel nonambipolar ion and electron fluxes are observed to be accompanied by azimuthal ion flows in the same directi ons as the antenna-excitation modes m. The phenomena are argued in ter ms of radial particle fluxes due to a nonambipolar transport mechanism [Hojo and Hatori, J. Phys. Sec. Jpn. 60, 2510 (1991); Hatakeyama et a l., J, Phys. Sec. Jpn. 60, 2815 (1991), and Phys. Rev. E 52, 6664(1995 )], which are induced when azimuthally traveling ICRF waves are absorb ed in the magnetized plasma column. (C) 1997 American Institute of Phy sics.