Collisionless m=1 tearing mode

Porcelli, Francesco

doi:10.1103/physrevlett.66.425

Cited by 169 publications

(271 citation statements)

References 9 publications

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“…In the case of the perpendicular ion dynamics, the importance of ion FLR effects has long been appreciated and was first studied in detail in Ref. 10. This work, like the calculations presented in Appendix B, is based on a Padé approximation of the perpendicular kinetic ion response that is leading-order accurate in the limits of both k Ќ i ӷ 1 and k Ќ i → 0.…”

Section: ͑13͒mentioning

confidence: 99%

Gyrokinetic simulations of collisionless magnetic reconnection

et al. 2007

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Spectroscopic observation of simultaneous bi-directional reconnection outflows in a laboratory plasma Phys. Plasmas 19, 080704 (2012) The role of compressibility in energy release by magnetic reconnection Phys. Plasmas 19, 082109 (2012) Design of a dual sensor probe array for internal field measurement in Versatile Experiment Spherical Torus Rev. Sci. Instrum. 83, 10D721 (2012) Additional information on Phys. Plasmas Linear and nonlinear gyrokinetic simulations of collisionless magnetic reconnection in the presence of a strong guide field are presented. A periodic slab system is considered with a sinusoidally varying reconnecting magnetic field component. The linear growth rates of the tearing mode in both the large and small ⌬Ј regimes are compared to kinetic and fluid theory calculations. In the nonlinear regime, focusing on the limit of large ⌬Ј, the nonlinear reconnection rates in the gyrokinetic simulations are found to be comparable to those obtained from a two-fluid model. In contrast to the fluid system, however, for T i ӷ T e and very small initial perturbation amplitudes, the reconnection in the gyrokinetic system saturates in the early nonlinear phase. This saturation can be overcome if the simulation is seeded initially with sufficient random noise.

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Section: ͑13͒mentioning

confidence: 99%

Gyrokinetic simulations of collisionless magnetic reconnection

et al. 2007

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“…20 It is generally recognized that resistive MHD does not accurately describe the fast crash times of sawteeth and that collisionless effects need to considered. 28,29 Since the physics of the forced reconnection and the mϭ1 mode is similar, collisionless effects may also be necessary to accurately predict the seed island formation in the problem presented here. We leave this open for future work.…”

Section: Discussionmentioning

confidence: 99%

Dynamics of seed magnetic island formation due to geometrically coupled perturbations

Hegna¹,

Callen

LaHaye

1998

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Seed magnetic island formation due to a dynamically growing external source in toroidal confinement devices is modeled as an initial value, forced reconnection problem. For an external source whose amplitude grows on a time scale quickly compared to the Sweet-Parker time of resistive magnetohydrodynamics, the induced reconnection is characterized by a current sheet and a reconnected flux amplitude that lags in time the source amplitude. This suggests that neoclassical tearing modes, whose excitation requires a seed magnetic island, are more difficult to cause in high Lundquist number plasmas.

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“…The resistive treatment is at least partially applicable for NSTX since ν ei τ A ≈ 0.3 using an electron-ion collision rate consistent with the neoclassical parallel resistivity. Thus, the collision rate may be competitive with characteristic mode growth rates and may impact even collisionless estimates of the growth-rate [42]. On the other hand, the resistive tearing layer width is much narrower than other characteristic widths thought to control the reconnection, so the simple resistive treatment is unlikely to be relevant to the early non-linear phase [43].…”

Section: Stabilization From Viscous Effectsmentioning

confidence: 99%

Internal Kink Mode Dynamics in High-beta NSTX Plasmas

Menard¹,

Bell²,

Fredrickson³

et al. 2004

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Abstract.Saturated internal kink modes have been observed in many of the highest toroidal β discharges of the National Spherical Torus Experiment (NSTX). These modes often cause rotation flattening in the plasma core, can degrade energy confinement, and in some cases contribute to the complete loss of plasma angular momentum and stored energy. Characteristics of the modes are measured using soft X-ray, kinetic profile, and magnetic diagnostics. Toroidal flows approaching Alfvénic speeds, island pressure peaking, and enhanced viscous and diamagnetic effects associated with high-β may contribute to mode non-linear stabilization. These saturation mechanisms are investigated for NSTX parameters and compared to experimental data.

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Collisionless m=1 tearing mode

Cited by 169 publications

References 9 publications

Gyrokinetic simulations of collisionless magnetic reconnection

Gyrokinetic simulations of collisionless magnetic reconnection

Dynamics of seed magnetic island formation due to geometrically coupled perturbations

Internal Kink Mode Dynamics in High-beta NSTX Plasmas

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