1985
DOI: 10.1063/1.865317
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Nonambipolar radial particle transport in a tandem mirror

Abstract: Nonambipolar transport has been measured in the tandem mirror TMX-U [Phys. Rev. Lett. 53, 783 (1984)] by applying charge conservation to the measured electron currents to the end walls. The resulting confinement time τ⊥ is found to depend upon the central-cell potential φ approximately as τ⊥(msec) =3φ(kV)−2. The transport rate, deduced from the data, agrees to within a factor of 1–5 with resonant-transport theory applied to the measured plasma parameters. Attempts to include radial effects by modeling the plas… Show more

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Cited by 23 publications
(19 citation statements)
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“…Most of these studies focused on the influence of the bias of cold limiters, concentric rings or grids on the rotation profiles and on the rotation-shear profiles of plasma columns or plasma tori (Hooper et al. 1985; Tsushima et al. 1986; Severn et al.…”
Section: Introductionmentioning
confidence: 99%
“…Most of these studies focused on the influence of the bias of cold limiters, concentric rings or grids on the rotation profiles and on the rotation-shear profiles of plasma columns or plasma tori (Hooper et al. 1985; Tsushima et al. 1986; Severn et al.…”
Section: Introductionmentioning
confidence: 99%
“…Theoretically, 3 ' 4 quadrupole magnetic fields used for MHD stability enhance the radial losses because resonant ions, which drift azimuthally by an odd multiple of /r/2 each axial bounce, experience large radial geodesic curvature drifts. In TMX-U, 5 the radial loss rate v± increases with potential <j> as expected from resonant transport (RT). However, the measured magnitude and radial variation of v± are inconsistent with RT theory.…”
mentioning
confidence: 87%
“…However, the non-self-consistent analysis leads to a discrepancy with the experiments, i.e. r^A(r) scales roughly as r" 2 in the calculation while the TMX-U data indicate that r^A(r) is almost independent of r [8]. An attempt to calculate the self-consistent radial potential profile in the TMX configuration faced a bifurcation problem as well as certain difficulties in defining the boundary conditions of the potential profile [9].…”
Section: Introductionmentioning
confidence: 95%
“…It is also important to calculate the radial potential self-consistently for radial transport because the neoclassical resonant plateau transport depends sensitively on the radial electric field. In analysing the radial transport in TMX-U [8], a parabolic radial potential profile was assumed for evaluating the neoclassical resonant plateau transport. However, the non-self-consistent analysis leads to a discrepancy with the experiments, i.e.…”
Section: Introductionmentioning
confidence: 99%