Toroidal magnetic confinement of non-neutral plasmas

Yoshida, Zensho; Ogawa, Yuichi; Morikawa, Junji; Himura, Haruhiko; Kondô, Shigeo; Nakashima, Chihiro; Kakuno, Shuichi; Iqbal, Muhamad; Volponi, Francesco; Shibayama, Norihisa; Tahara, Shigeru

doi:10.1063/1.1302140

Cited by 20 publications

(11 citation statements)

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“…Closed toroidal field line systems have been used to confine pure electron plasmas, [1][2][3][4] and more recently, magnetic surface configurations have become of interest as confinement devices for non-neutral plasmas. 5,6 The physics of pure electron plasmas confined on magnetic surfaces is fundamentally different from previously studied configurations. A magnetic surface configuration is characterized by magnetic field lines that lie on toroidal surfaces ͑the magnetic surfaces͒, with each field line coming arbitrarily close to any point on the surface that it lies on.…”

Section: Introductionmentioning

confidence: 97%

Confinement of plasmas of arbitrary neutrality in a stellarator

et al. 2004

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The equilibrium, stability, and transport of pure electron plasmas confined on magnetic surfaces is reviewed. The prospects for creation of partly neutralized plasmas and electron–positron plasmas confined in a stellarator are discussed. The Columbia Non-neutral Torus, a small 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, and the initial experimental plans for creation and diagnosis of pure electron plasmas are discussed.

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Section: Introductionmentioning

confidence: 97%

Confinement of plasmas of arbitrary neutrality in a stellarator

et al. 2004

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“…Closed toroidal field line systems have been used to confine pure electron plasmas [1,2,3,4], and more recently, magnetic surface configurations have become of interest as confinement devices for non-neutral plasmas [5,6]. The physics of pure electron plasmas confined on magnetic surfaces is fundamentally different from previously studied configurations.…”

Section: Introductionmentioning

confidence: 98%

“…In a non-neutral plasma experiment, including CNT, this is a non-trivial constraint that requires careful matching of the injected electron energy to the plasma potential, or some method of cooling the plasma after it has been injected. a/λ D 1 is particularly important in a non-neutral stellarator, given the predicted strong scaling of the confinement time with a/λ D , Equation 5. Another important parameter is the time scale for ion accumulation due to ionization of background neutrals, τ i .…”

Section: Important Physics Parametersmentioning

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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“…Simultaneous confinement of electron and positron plasmas enables experiments on pair plasmas, [5][6][7][8] and, in the future, it can potentially be used for laboratory studies of electron-positron plasma in space phenomena. Confinement of toroidal plasmas with arbitrary nonneutrality 17,18 is the next major progress toward the experimental studies of electronpositron and antihydrogen plasmas. 11 An efficient trap system for non-neutral plasmas can also be used for storage of antimatter particles.…”

Section: Introductionmentioning

confidence: 99%

Confinement of electron plasma by levitating dipole magnet

et al. 2010

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A recent experiment on the Ring Trap 1 device has demonstrated long-term (exceeding 300 s) confinement of non-neutral (pure electron) plasma in a dipole magnetic field; particles diffuse inward, steepening the density gradient and self-organizing into a stable vortex structure [Z. Yoshida et al., Phys. Rev. Lett. 104, 235004 (2010)]. In this study, the internal structures of the plasma are experimentally investigated, and it is shown that the observations are consistent with rigidly rotating charged particle clump. The radial profiles of electrostatic potential and electron density consistently show that the drift velocity has homogeneous angular frequency in the confinement region. The electrostatic fluctuations also rotate rigidly with a phase velocity that agrees with the drift velocity. The magnetospheric system should have a wide application in confining single-species and even multiple-species charged particles.

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Toroidal magnetic confinement of non-neutral plasmas

Cited by 20 publications

References 0 publications

Confinement of plasmas of arbitrary neutrality in a stellarator

Confinement of plasmas of arbitrary neutrality in a stellarator

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

Confinement of electron plasma by levitating dipole magnet

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