Results 241 to 250 of about 8,827,923 (262)
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Error field penetration in the presence of diamagnetic effects
Nuclear Fusion, 2009The penetration of the magnetic field in a rotating inhomogeneous plasma is investigated with direct numerical simulations. The main focus of this work is to test the linear, singular-layer models when diamagnetic and finite Larmor radius effects are included.
Fulvio Militello
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On the Transition Regime of Nonlinear Error Field Penetration in Toroidal Plasmas*
Plasma Science and Technology, 2015The error field penetration is numerically studied in the frame of the visco-resistive magnetohydrodynamics (MHD) model. A transition scaling is obtained to link the Rutherford and Waelbroeck regimes in the nonlinear phase of error field penetration process.
Huihui Wang +3 more
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Nuclear Fusion, 2021
Abstract The density scaling of n = 1 error field penetration is investigated under radio-frequency (RF)-dominant heated L-mode discharges in the EAST tokamak. It is found that the density scaling of the threshold field strength for error field penetration in lower-hybrid current drive (LHCD) plasmas is about
Shuai Gu, Huihui Wang, Youwen Sun
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Abstract The density scaling of n = 1 error field penetration is investigated under radio-frequency (RF)-dominant heated L-mode discharges in the EAST tokamak. It is found that the density scaling of the threshold field strength for error field penetration in lower-hybrid current drive (LHCD) plasmas is about
Shuai Gu, Huihui Wang, Youwen Sun
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Nonlinear error-field penetration in low density ohmically heated tokamak plasmas
Plasma Physics and Controlled Fusion, 2012A theory is developed to predict the error-field penetration threshold in low density, ohmically heated, tokamak plasmas. The novel feature of the theory is that the response of the plasma in the vicinity of the resonant surface to the applied error-field is calculated from nonlinear drift-MHD (magnetohydrodynamical) magnetic island theory, rather than
Richard Fitzpatrick
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Plasma parameter scaling of the error-field penetration threshold in tokamaks
Physics of Plasmas, 2003A previously published analytical formula for the error-field penetration threshold in rotating tokamak plasmas is successfully benchmarked against nonlinear magnetohydrodynamical simulations in slab geometry. Moreover, the fundamental assumption underlying the derivation of this formula, namely, that the response of a flowing plasma to a low amplitude,
Richard Fitzpatrick
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Error field penetration and plasma rotation in H mode and control of ELM-free regimes in COMPASS-D
Nuclear Fusion, 1999Error fields are observed to form locked modes at abnormally high densities in ohmic ELM-free H modes in COMPASS-D. Recent experiments are described where the penetration is correlated with measured toroidal rotation changes intrinsic to the H mode in COMPASS-D. Once penetrated, the error field triggers ELMs (often followed by a return to L mode). This
A W Morris, R J Buttery, T C Hender
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Neoclassical toroidal viscosity and error-field penetration in tokamaks
Physics of Plasmas, 2008A model for field error penetration is developed that includes nonresonant as well as the usual resonant field error effects. The nonresonant components cause a neoclassical toroidal viscous torque that tries to keep the plasma rotating at a rate comparable to the ion diamagnetic frequency.
A. J. Cole, C. C. Hegna, J. D. Callen
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On error field penetration processes in magnetic island mode locking
Journal of Plasma Physics, 2013Error field penetration processes in magnetic island mode locking with the time-varying and fixed boundary perturbations are investigated numerically by using a two-dimensional resistive magnetohydrodynamic model in slab geometry. The evolution of various poloidal torques on the rational surface in the processes is analyzed in detail.
H. H. Wang, Z. X. Wang, X. G. Wang
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Error-field penetration thresholds in ohmically heated ITER and SPARC plasmas
Physics of Plasmas, 2023The critical n = 1, n = 2, and n = 3 error-field amplitudes needed to trigger error-field penetration in ITER and SPARC, steady-state, ohmically heated plasmas are calculated using a standard asymptotic matching approach. The calculation incorporates plasma impurities, trapped particles, the bootstrap current, and neoclassical poloidal flow-damping ...
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Density scaling onn = 1 error field penetration in ohmically heated discharges in EAST
Nuclear Fusion, 2018Density scaling of error field penetration in EAST is investigated with different n = 1 magnetic perturbation coil configurations in ohmically heated discharges. The density scalings of error field penetration thresholds under two magnetic perturbation spectra are and , where b r is the error field and n e is the line averaged electron density.
Hui-Hui Wang +17 more
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