Asymmetric stable equilibria of non-neutral plasmas

Notte, John; Peurrung, A.J.; Fajans, J.; Chu, R.; Wurtele, J. S.

doi:10.1103/physrevlett.69.3056

Cited by 37 publications

(23 citation statements)

References 6 publications

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“…The physics of non-neutral plasmas on magnetic surfaces is of interest because the magnetic surface topology allows pure electron plasmas to reside in an equilibrium that is a minimum energy state [4,5] rather than a maximum energy equilibrium as is the case for pure electron plasmas in Penning traps and pure toroidal field traps [6,7]. The physics of these non-neutral plasmas in CNT is also of interest in terms of neoclassical stellarator transport in the presence of strong radial electric fields.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Electron-Rich Plasmas in the CNT Stellarator

Pedersen

Berkery

Boozer

et al. 2008

Plasma and Fusion Research

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Pure electron plasmas and electron plasmas with a finite ion fraction have been studied in the Columbia Nonneutral Torus (CNT) since the end of 2004. Results from the first three years of operation are summarized. Stable, small Debye length pure electron plasmas are routinely created, and have confinement times up to 20 msec. The confinement is limited by radial transport caused by internal rods, as well as electron-neutral collisions. The neutral driven transport rate is indicative of poor particle orbits in CNT, despite the strong radial electric field. Numerical simulations shed light on this issue, demonstrating the detrimental effects of variations in the electrostatic potential on a magnetic surface. With the installation of a magnetic surface conforming electrostatic boundary and the transition to external diagnostics, significantly longer confinement times should be possible. Also presented are observations of sudden confinement jumps that have a hysteretic behavior, and observations of an ion driven instability.

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Section: Introductionmentioning

confidence: 99%

Dynamics of Electron-Rich Plasmas in the CNT Stellarator

Pedersen

Berkery

Boozer

et al. 2008

Plasma and Fusion Research

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“…When azimuthally asymmetric potentials are applied to the wall, the plasma deforms into an asymmetric equilibrium. These equilibria have been observed experimentally [8]. In a previous theoretical work [9], the static shapes were studied analytically for small applied potentials and numerically for arbitrary potentials.…”

Section: Applications To Asymmetric Plasma Equilibriamentioning

confidence: 97%

“…2. The well-known, but peculiar, attraction of the negatively charged plasma to negative voltages [8] can be seen, as well as a severe deformation of the plasma shape from cylindrical for large asymmetries. …”

Section: Applications To Asymmetric Plasma Equilibriamentioning

confidence: 99%

Application of Contour Dynamics to Systems with Cylindrical Boundaries

Backhaus¹,

Fajans²,

Wurtele³

1998

Journal of Computational Physics

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“…This is in contrast to the Penning trap [8] and the pure toroidal field trap [9], which have electrostatic potentials that maximize the potential energy, and the electron plasma tends to move away from positive image charges. However, the energy-like quantity that is minimized in equilibrium in a magnetic surface configuration is not the free energy, so this does not guarantee stability of all possible configurations.…”

Section: Stabilitymentioning

confidence: 99%

Confinement of non-neutral plasmas in the Columbia Non-neutral Torus Experiment

Pedersen¹

2003

AIP Conference Proceedings

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Abstract. The physics of non-neutral plasmas confined on magnetic surfaces is discussed. The Columbia Non-neutral Torus (CNT), a table-top ultrahigh vacuum stellarator being constructed at Columbia University, is being built to systematically study non-neutral plasmas confined on magnetic surfaces. The experimental design is discussed in the context of relevant physics parameters, such as the number of Debye lengths in the device, and the parallel versus perpendicular time scales.

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Asymmetric stable equilibria of non-neutral plasmas

Cited by 37 publications

References 6 publications

Dynamics of Electron-Rich Plasmas in the CNT Stellarator

Dynamics of Electron-Rich Plasmas in the CNT Stellarator

Application of Contour Dynamics to Systems with Cylindrical Boundaries

Confinement of non-neutral plasmas in the Columbia Non-neutral Torus Experiment

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