The ion cyclotron instabilities in the PHOENIX high energy injection mirror machine have been suppressed by applying oscillating electric fields. Two instabilities appear to be present. One is suppressed by energy spreading and the suppression of the other appears to be due to the effect of the applied electric fields on the electrons.

Articles you may be interested inGrating spectrometer system for beam emission spectroscopy diagnostics using high-energy negative-ion-based neutral beam injection on LHDa) Rev. Sci. Instrum. 81, 10D720 (2010); 10.1063/1.3479113Experimental comparison between plasma and gas neutralization of high-energy negative ion beams Rev.

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Experiments using a single feedback loop, in which electrostatic signals from a plasma were amplified and fed back as potentials to the plasma boundary, have been carried out in the PHOENIX-II mirror machine working as a simple mirror. The effect of the feedback system on plasma losses caused by the flute instability has been studied and a correlation between plasma losses and the amplitude and frequency of the instability has been obtained. It is concluded that plasma losses can be controlled, to a certain extent, by a simple feedback system.