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Jun 2004

Volume 11, Issue 6, pp. L29-L32, 2989-3334

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Zonal flow and field generation by finite β drift waves: Finite ion temperature effects

P. N. Guzdar, R. G. Kleva, and N. Chakrabarti

Phys. Plasmas 11, 3324 (2004); http://dx.doi.org/10.1063/1.1719021 (4 pages) | Cited 5 times

Online Publication Date: 17 May 2004

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The generation of zonal flows and zonal fields by finite β drift waves in plasmas with finite ion temperature Ti is investigated. This work extends our earlier work with zero ion temperature. The growth rate of the zonal flow and field is enhanced by finite Ti effects. This leads to a reduction in the critical electron temperature derived earlier for triggering low to high transitions in tokamak plasmas. © 2004 American Institute of Physics.
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52.30.Cv Magnetohydrodynamics (including electron magnetohydrodynamics)
52.55.Fa Tokamaks, spherical tokamaks
47.85.L- Flow control
52.35.Kt Drift waves

Anomalous skin effect for anisotropic electron velocity distribution function

Igor Kaganovich, Edward Startsev, and Gennady Shvets

Phys. Plasmas 11, 3328 (2004); http://dx.doi.org/10.1063/1.1723461 (3 pages) | Cited 2 times

Online Publication Date: 17 May 2004

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The anomalous skin effect in a plasma with a highly anisotropic electron velocity distribution function (EVDF) is very different from the skin effect in a plasma with isotropic EVDF. An analytical solution was derived for the electric field penetrated into plasma with the EVDF described as a Maxwellian with two temperatures Tx≫Tz, where x is the direction along the plasma boundary and z is the direction perpendicular to the plasma boundary. The skin layer was found to consist of two distinct regions of width of order vTx/ω and vTz/ω, where vTx,z = math is the thermal electron velocity and ω is the incident wave frequency. © 2004 American Institute of Physics.
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52.40.Hf Plasma-material interactions; boundary layer effects
52.35.Fp Electrostatic waves and oscillations (e.g., ion-acoustic waves)
52.25.Fi Transport properties
52.35.Qz Microinstabilities (ion-acoustic, two-stream, loss-cone, beam-plasma, drift, ion- or electron-cyclotron, etc.)

Potential structure of a plasma in an internal conductor device under the influence of a biased electrode

H. Saitoh, Z. Yoshida, H. Himura, J. Morikawa, and M. Fukao

Phys. Plasmas 11, 3331 (2004); http://dx.doi.org/10.1063/1.1724833 (4 pages) | Cited 6 times

Online Publication Date: 17 May 2004

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The present study examined the electric field structure in a magnetized plasma in a prototype ring trap (Proto-RT) device with an internal ring electrode. A radial electric field of up to 3 kV m−1 was produced in the broad region between the electrode and vessel wall when the ring electrode was negatively biased. The resultant E×B toroidal rotational speed is comparable to the ion sound speed. Positive biasing, however, created a gap between the plasma and the electrode, failing to produce an internal electric field. © 2004 American Institute of Physics.
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52.55.-s Magnetic confinement and equilibrium
52.30.-q Plasma dynamics and flow
52.80.Pi High-frequency and RF discharges
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