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Collisional Drift Waves—Identification, Stabilization, and Enhanced Plasma Transport
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30.However, amplitudes of modes with are observed to be smaller than might be expected from a comparison of linear growth rates.
31.An ion mass dependence of the onset of ion density fluctuations in stellarator plasmas comparable to the one found here has been reported previously [R. A. Ellis, Jr., K. Bol, and T. H. Stix, Phys. Fluids 10, 2095 (1967)] and found in accord with either ion viscous damping, ion Larmor radius, or ion cyclotron effects.
32.Some results of nonlinear theories of collisional drift waves have been given recently:
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35.and private communication with F. F. Chen and G. Grieger.
36.It has been suggested that the equilibrium radial electric field‐may play a role in determining onset of low‐frequency oscillations [L. Enriques, A. M. Levine, and G. B. Righetti, Plasma Phys. 10, 641 (1968)].
36.In the present experiment, however, the effect of the radial electric field other than Doppler shift of the observed frequency, appears to be negligible. When plate temperature is increased, increases as , As the plate temperature is varied, we observe drift‐wave mode changes consistent with Eq. (17), We do not observe as expected if a mechanism would play a role, as suggested in the above reference.
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