This paper reports measurements made in an inhomogeneous magnetoplasma, to determine the flow frequency drift-wave dispersion curve. The waves in the frequency range 20-220 kHz were induced externally by various methods, and were detected by phase-sensitive techniques in order to discern the signal above the noise of the plasma. Separate azimuthal modes m=0, +1, or -1 were propagated in axial homogeneous magnetic fields of 0.75 kG and 1.00 kG, and the ( omega -k) dispersion curve was obtained for each case. The plasma in these experiments was a hollow-cathode arc discharge running in helium, and had an electron temperature of 7.0+or-0.3 eV, and a constant inverse radial scale length 1/n 0 (dn 0 /dr)=0.65+or-0.05 cm -1 . The experimental results obtained are compared with a modified simple drift-wave theory, which includes both the effects of a finite radial electric field, and, an ion neutral collision time. Reasonable agreement is found between the theory and the experimental results.
No takes yet. Share an insight, caveat, or question.
Keen et al. (1970) studied this question.