A laboratory study of collisional electrostatic ion cyclotron waves

Details A laboratory study of collisional electrostatic ion cyclotron waves A laboratory study of collisional electrostatic ion cyclotron waves

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9113729s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Dec. 1, 1986, p. 13729-13731. Navy-supported research.

Physics

13

Collisional Plasmas, Cyclotron Radiation, Ionic Waves, Magnetohydrodynamic Stability, Earth Ionosphere, Frequency Stability, Oxygen Ions, Pressure Effects, Wave Propagation

Scientific paper

The effects of neutral-particle collisions on electrostatic ion cyclotron instability are analyzed. Experiments were conducted in the Q machine of Motley (1975) with a cesium plasma in which the neutral gas pressure in the main chamber varied from about 5 microtorr-10 mtorr. The relation between electrostatic ion cyclotron wave amplitude and frequency and neutral argon pressure is examined. It is observed that over the full range of neutral pressure the frequency changes by less than 10 percent and the ion cyclotron waves continue to be excited and reach amplitudes of at least several percent at values of the neutral pressure where the ion-neutral collision frequency/ion gyrofrequency is about 0.3.

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